KR> Corvair/KR/Aerocarb update 12/7/12
I have continued to work on the needle only to come to the conclusion that I don't think I am going to be able to get the carb tuned without relocating it. Here are the details: As of two weeks ago, I almost had the needle shaped properly for the engine. At that point I felt that it was still too lean at WOT. I continued to remove material until I almost had it running properly at WOT and then noticed another trend. At throttle settings just below WOT, I was no longer able to get the engine to gain RPM by pulling the carb heat. I also noticed that my CHT' and EGT's from right to left were becoming increasingly divergent. In short, while the mixture distribution is "acceptable" at partial throttle settings, it does not distribute fuel acceptably near WOT. As I had previously mentioned, the Aerocarb is mounted on its side with a 90 degree twisted vane right after the carb. Sitting in the airplane, the fuel "hole" is on the left side of the engine. What I am seeing is that the right side of the engine is now running rich enough to start to stumble while the left side is now in tune. This issue was not uncovered until I allowed the carb slide to fully open (previously it would remain 5/6" closed at WOT in the cockpit). At this point, I think its safe to fly if I limit the carb opening to a setting that is before this becomes and issue. Its making plenty of power even at that. A bandaid solution at best. I suppose I could continue to mess with the vane but the I feel that the root issue is that the carb is not mounted with the needle aligned with the split in the intake manifold. My Sonerai would not run properly with the carb misaligned by only 15 degrees. When I straightened the carb so the needle would align with the split I gained 150rpm and the left to right distribution was much improved. I spoke with WW about the issue and he concurred. I am not sure what I want to do to address this yet. I may try one of WW's intake manifolds with a different carb. Still pondering the options. More to come as I continue to work through this. I think my needle is now correct but I need to figure the rest of the puzzle out. Jeff Lange
KR> Aerocarb setting
Thanks Joe. Just can't deal with something that should be so simple (C85, O200) to be so complex. I think I will go with an Ellison right now and have it over with. Larry -Original Message- From: krnet-boun...@mylist.net [mailto:krnet-boun...@mylist.net] On Behalf Of joe.kr2s.buil...@juno.com Sent: Wednesday, May 19, 2010 6:44 AM To: kr...@mylist.net; corvaircr...@mylist.net Subject: KR> Aerocarb setting Larry, sorry i didn't answer sooner, I missed the fact that you were talking about an Areo carb. I think that a little information might be needed but I'll take a shot at it. I am thinking that you have a 35mm carb on a 2700 cc corvair? i any case the success of anything but the #3 needle has been elusive. Make the mark on it just like the instruction say where the flat ends. This is the starting point for setting the needle depth in the slide. I am working from memory so the instruction should be referred to to allow for my dyslexia, I think the flat faces away from you when viewing from the intake throat. Make sure that you have the mixture cut off set up by the instructions also. Make sure you have your timing set on the engine at least as accurate as you can for the start. That affects low end idle tremendously. I left the stop nut for the throttle adjustment loose so that I had a full range for starting and running. When I had the engine running i then pulled the throttle out at slow increments until I reached what I thought would be my low idle without it being rough (for me that is about 700-750 rpm) At this point i redid timing dynamically to full static rpm (again for me i am set up to 32 deg. advance at 2900 Rpm) At this point started to adjust the mixture needle. I did not have a mixture gage at the time and used a dwell/rpm to visibly see results as well as the sound of the engine. I was making adjustments with the engine running (this is not for everyone-let your personal safety be your guide) When I made an adjustment I would run it up and down to make sure that it would return to the same rpm and still idle smooth. The needle needs to make very small turns when you are close to the results that your after. I made an adjustment this past week for summer time temps and it was on the order of an 1/8 turn at a time. I think that I have mine adjusted to the rich side of the original set point. In the end I really was lucky I guess as the engine started the first time and was able to run. The adjustments were not far from what the instructions tell for set up. I have nearly 500 hours with the carb now. The only thing is the slide type carbs will always favor a side of the engine for rich and lean. maybe 100 deg from side to side. The solution for me was to install a tornado directly behind the carb to swirl the mixture before the split in the intake risers. Roy, I fell that you may be a little over optimistic about exhaust spans with respect to the comment of 80 deg. span being a lot. I currently have my alarm set at 170 deg. span and it occasionally goes off in full power climbs and requires a slight mixture adjustment to settle it. But on the other end of the spectrum I can get exhaust spans at altitude (7500 or higher) below 30 deg. At low altitudes 50 to 70 deg spans are common. A friend with a hot Lance air (actually several of them) told me that 80 deg. span is the lowest he has ever gotten to. Hope this helps a little. Joe Horton, Coopersburg, Pa. -- Forwarded Message -- List-Post: krnet@list.krnet.org Date: Tue, 18 May 2010 06:59:17 -0500 >Mark, I didn't get any response back on my Question about setting up and >operating the posy type aerovee Carb on my Corvair. Are you running this >Carb or know someone that does. Thanks, la...@lebanair.com Penny Stock Jumping 2000% Sign up to the #1 voted penny stock newsletter for free today! http://thirdpartyoffers.juno.com/TGL3141/4bf3eb74a71336885st01duc ___ Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net please see other KRnet info at http://www.krnet.org/info.html
KR> Aerocarb
This is the direction I'm going. I can't deal with quirky stuff. Its new and pretty and should make a good boat anchor on my little zodiac. Thanks, la...@lebanair.com -Original Message- From: krnet-boun...@mylist.net [mailto:krnet-boun...@mylist.net] On Behalf Of Randy Smith Sent: Wednesday, May 19, 2010 3:12 PM To: KRnet Subject: RE: KR> Aerocarb Go by you a zenith carb, Great plains sells them also shops that sell parts for gas welders and generators sell them and be done with it. After 2 months of messing around with mine I bought 1 from great plains and never looked back. I had 3 Posa carbs 2 made good book ends., 1 I gave away. --- On Wed, 5/19/10, Hall, Rodney CTR NNSY, C210 wrote: From: Hall, Rodney CTR NNSY, C210 Subject: RE: KR> Aerocarb To: "KRnet" List-Post: krnet@list.krnet.org Date: Wednesday, May 19, 2010, 7:13 AM I was just reading an article the other day in an old sport aviation about setting up the posa. You might want to search the Sport Aviation archives on www.eaa.org it seemed a very good article and apparently you need to set up the high speed first then switch out the needles to find the best overall idle and low speed operation. I think it was in a feb 82 sport aviation but I am not sure. Rodney Hall -Original Message- From: krnet-boun...@mylist.net [mailto:krnet-boun...@mylist.net] On Behalf Of Mark Langford Sent: Tuesday, May 18, 2010 1:04 To: KRnet Subject: KR> Aerocarb Larry Knox wrote: > Mark, I didn't get any response back on my Question about setting up > and operating the posy type aerovee Carb on my Corvair. Are you > running this Carb or know someone that does. Thanks, > la...@lebanair.com Joe Horton is running an Aerocarb. I'm sure he'll chime in when he gets a chance, but basically it does work and once properly adjusted, tends to stay that way. I do know that they don't appreciate fuel pump pressure, and prefer gravity feed instead. There should be plenty of info in the CorvAircraft archives (see ttp://www.maddyhome.com/corvairsrch/index.jsp ), using the keyword "Aerocarb". Mark Langford N56ML "at" hiwaay.net website at http://www.N56ML.com ___ Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net please see other KRnet info at http://www.krnet.org/info.html ___ Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net please see other KRnet info at http://www.krnet.org/info.html ___ Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net please see other KRnet info at http://www.krnet.org/info.html
KR> AeroCarb 4-Sale
I have barely used (flew with it 10hrs) 32mm AeroCarb for sale for $200 if anyone is interested before I put it on E-Bay. Fits on most VW size engines. > ___ > Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp > to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net > please see other KRnet info at http://www.krnet.org/info.html > > >
KR> Aerocarb
Go by you a zenith carb, Great plains sells them also shops that sell parts for gas welders and generators sell them and be done with it. After 2 months of messing around with mine I bought 1 from great plains and never looked back. I had 3 Posa carbs 2 made good book ends., 1 I gave away. --- On Wed, 5/19/10, Hall, Rodney CTR NNSY, C210 wrote: From: Hall, Rodney CTR NNSY, C210 Subject: RE: KR> Aerocarb To: "KRnet" List-Post: krnet@list.krnet.org Date: Wednesday, May 19, 2010, 7:13 AM I was just reading an article the other day in an old sport aviation about setting up the posa. You might want to search the Sport Aviation archives on www.eaa.org it seemed a very good article and apparently you need to set up the high speed first then switch out the needles to find the best overall idle and low speed operation. I think it was in a feb 82 sport aviation but I am not sure. Rodney Hall -Original Message- From: krnet-boun...@mylist.net [mailto:krnet-boun...@mylist.net] On Behalf Of Mark Langford Sent: Tuesday, May 18, 2010 1:04 To: KRnet Subject: KR> Aerocarb Larry Knox wrote: > Mark, I didn't get any response back on my Question about setting up > and operating the posy type aerovee Carb on my Corvair. Are you > running this Carb or know someone that does. Thanks, > la...@lebanair.com Joe Horton is running an Aerocarb. I'm sure he'll chime in when he gets a chance, but basically it does work and once properly adjusted, tends to stay that way. I do know that they don't appreciate fuel pump pressure, and prefer gravity feed instead. There should be plenty of info in the CorvAircraft archives (see ttp://www.maddyhome.com/corvairsrch/index.jsp ), using the keyword "Aerocarb". Mark Langford N56ML "at" hiwaay.net website at http://www.N56ML.com ___ Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net please see other KRnet info at http://www.krnet.org/info.html ___ Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net please see other KRnet info at http://www.krnet.org/info.html
KR> Aerocarb setting
Larry, sorry i didn't answer sooner, I missed the fact that you were talking about an Areo carb. I think that a little information might be needed but I'll take a shot at it. I am thinking that you have a 35mm carb on a 2700 cc corvair? i any case the success of anything but the #3 needle has been elusive. Make the mark on it just like the instruction say where the flat ends. This is the starting point for setting the needle depth in the slide. I am working from memory so the instruction should be referred to to allow for my dyslexia, I think the flat faces away from you when viewing from the intake throat. Make sure that you have the mixture cut off set up by the instructions also. Make sure you have your timing set on the engine at least as accurate as you can for the start. That affects low end idle tremendously. I left the stop nut for the throttle adjustment loose so that I had a full range for starting and running. When I had the engine running i then pulled the throttle out at slow increments until I reached what I thought would be my low idle without it being rough (for me that is about 700-750 rpm) At this point i redid timing dynamically to full static rpm (again for me i am set up to 32 deg. advance at 2900 Rpm) At this point started to adjust the mixture needle. I did not have a mixture gage at the time and used a dwell/rpm to visibly see results as well as the sound of the engine. I was making adjustments with the engine running (this is not for everyone-let your personal safety be your guide) When I made an adjustment I would run it up and down to make sure that it would return to the same rpm and still idle smooth. The needle needs to make very small turns when you are close to the results that your after. I made an adjustment this past week for summer time temps and it was on the order of an 1/8 turn at a time. I think that I have mine adjusted to the rich side of the original set point. In the end I really was lucky I guess as the engine started the first time and was able to run. The adjustments were not far from what the instructions tell for set up. I have nearly 500 hours with the carb now. The only thing is the slide type carbs will always favor a side of the engine for rich and lean. maybe 100 deg from side to side. The solution for me was to install a tornado directly behind the carb to swirl the mixture before the split in the intake risers. Roy, I fell that you may be a little over optimistic about exhaust spans with respect to the comment of 80 deg. span being a lot. I currently have my alarm set at 170 deg. span and it occasionally goes off in full power climbs and requires a slight mixture adjustment to settle it. But on the other end of the spectrum I can get exhaust spans at altitude (7500 or higher) below 30 deg. At low altitudes 50 to 70 deg spans are common. A friend with a hot Lance air (actually several of them) told me that 80 deg. span is the lowest he has ever gotten to. Hope this helps a little. Joe Horton, Coopersburg, Pa. -- Forwarded Message -- List-Post: krnet@list.krnet.org Date: Tue, 18 May 2010 06:59:17 -0500 >Mark, I didn't get any response back on my Question about setting up and >operating the posy type aerovee Carb on my Corvair. Are you running this >Carb or know someone that does. Thanks, la...@lebanair.com Penny Stock Jumping 2000% Sign up to the #1 voted penny stock newsletter for free today! http://thirdpartyoffers.juno.com/TGL3141/4bf3eb74a71336885st01duc
KR> Aerocarb
Correction it is in the March 1982 Sport Aviation, -Original Message- From: krnet-boun...@mylist.net [mailto:krnet-boun...@mylist.net] On Behalf Of Hall, Rodney CTR NNSY, C210 Sent: Wednesday, May 19, 2010 8:13 To: KRnet Subject: RE: KR> Aerocarb I was just reading an article the other day in an old sport aviation about setting up the posa. You might want to search the Sport Aviation archives on www.eaa.org it seemed a very good article and apparently you need to set up the high speed first then switch out the needles to find the best overall idle and low speed operation. I think it was in a feb 82 sport aviation but I am not sure. Rodney Hall -Original Message- From: krnet-boun...@mylist.net [mailto:krnet-boun...@mylist.net] On Behalf Of Mark Langford Sent: Tuesday, May 18, 2010 1:04 To: KRnet Subject: KR> Aerocarb Larry Knox wrote: > Mark, I didn't get any response back on my Question about setting up > and operating the posy type aerovee Carb on my Corvair. Are you > running this Carb or know someone that does. Thanks, > la...@lebanair.com Joe Horton is running an Aerocarb. I'm sure he'll chime in when he gets a chance, but basically it does work and once properly adjusted, tends to stay that way. I do know that they don't appreciate fuel pump pressure, and prefer gravity feed instead. There should be plenty of info in the CorvAircraft archives (see ttp://www.maddyhome.com/corvairsrch/index.jsp ), using the keyword "Aerocarb". Mark Langford N56ML "at" hiwaay.net website at http://www.N56ML.com ___ Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net please see other KRnet info at http://www.krnet.org/info.html ___ Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net please see other KRnet info at http://www.krnet.org/info.html
KR> Aerocarb
I was just reading an article the other day in an old sport aviation about setting up the posa. You might want to search the Sport Aviation archives on www.eaa.org it seemed a very good article and apparently you need to set up the high speed first then switch out the needles to find the best overall idle and low speed operation. I think it was in a feb 82 sport aviation but I am not sure. Rodney Hall -Original Message- From: krnet-boun...@mylist.net [mailto:krnet-boun...@mylist.net] On Behalf Of Mark Langford Sent: Tuesday, May 18, 2010 1:04 To: KRnet Subject: KR> Aerocarb Larry Knox wrote: > Mark, I didn't get any response back on my Question about setting up > and operating the posy type aerovee Carb on my Corvair. Are you > running this Carb or know someone that does. Thanks, > la...@lebanair.com Joe Horton is running an Aerocarb. I'm sure he'll chime in when he gets a chance, but basically it does work and once properly adjusted, tends to stay that way. I do know that they don't appreciate fuel pump pressure, and prefer gravity feed instead. There should be plenty of info in the CorvAircraft archives (see ttp://www.maddyhome.com/corvairsrch/index.jsp ), using the keyword "Aerocarb". Mark Langford N56ML "at" hiwaay.net website at http://www.N56ML.com ___ Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net please see other KRnet info at http://www.krnet.org/info.html
KR> Aerocarb
I have a header tank in my KR-1 and in order to scavenge the last 3 gallons out of the tank with enough head pressure for the Aero-Carb or Rev-Flow (3/4-1&1/2lbs) i installed a small adjustable pressure regulator just downstream from the fuel pump should I run it that low on fuel which I dont really plan on doing, but it is there just in case. On 5/17/2010 10:04 PM, Mark Langford wrot > I do know that they don't appreciate fuel pump pressure, and > prefer gravity feed instead. There should be plenty of info in the > CorvAircraft archives (see > ttp://www.maddyhome.com/corvairsrch/index.jsp ), using the keyword > "Aerocarb". > > Mark Langford > N56ML "at" hiwaay.net > website at http://www.N56ML.com > > > > ___ > Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp > to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net > please see other KRnet info at http://www.krnet.org/info.html > > >
KR> Aerocarb
> > > > and once properly adjusted, tends to stay > that way. I do know that they don't appreciate fuel pump pressure, and > prefer gravity feed instead. > > Mark Langford > N56ML "at" hiwaay.net > website at http://www.N56ML.com > > > > I flew for about 10 hrs with an AeroCarb on my KR-1 with a 1835 VW and single > port heads. Me and my A&P friend spent 50+ hrs getting it properly tuned! It > ran ok,but I was never happy with the uneven fuel distribution(atomization) > and occasional sputter that would result if I didnt have the mixture set > just-right.'Just-Right' was a compromise(a mixture setting) between the > richest and leanest running cyclinders. In the end, I opted out and installed > another injector type carb, the Rev-Flow version. Rev-Flow seemed to have a > much better engineered mixture control. With that and a home made version of > the Vortec/Cyclone generator in the intake manifold I am a Happy Camper and > egt's run much closer than before. I have AeroCarb for sale and will let it go for $200 if anyone is interested...before I put it up on E-Bay.
KR> Aerocarb
Larry Knox wrote: > Mark, I didn't get any response back on my Question about setting up and > operating the posy type aerovee Carb on my Corvair. Are you running this > Carb or know someone that does. Thanks, la...@lebanair.com Joe Horton is running an Aerocarb. I'm sure he'll chime in when he gets a chance, but basically it does work and once properly adjusted, tends to stay that way. I do know that they don't appreciate fuel pump pressure, and prefer gravity feed instead. There should be plenty of info in the CorvAircraft archives (see ttp://www.maddyhome.com/corvairsrch/index.jsp ), using the keyword "Aerocarb". Mark Langford N56ML "at" hiwaay.net website at http://www.N56ML.com
KR>aerocarb (mark Jones)
Thanks Mark very usefull info. Joel -- http://USFamily.Net/info - Unlimited Internet - From $8.99/mo! --
KR>Aerocarb / Fuel pressure regulator / FIRE
Mark, Try the fuel pressure regulator from Auto Zone. The builder of a Zenith 601 using a Harley engine used one and was able to get his fuel pressure set to 1 1/2 pounds on the dial to keep from flooding his carb which I suspect is similar to yours. The data sheet claims it shuts off when the selected pressure is reached and apparently just passes fuel at or below the desired pressure. I have one inline to my 0-200 and it seems to work well also. It goes for $19.95 Cheap enough to try. Larry Flesner
KR>Aerocarb / Fuel pressure regulator / FIRE
Larry, that is the first one I tried and actually had better results than the Holley but I could not get it to work properly either. Mark Jones (N886MJ) Wales, WI USA E-mail me at flyk...@wi.rr.com Visit my KR-2S CorvAIRCRAFT web site at http://mywebpage.netscape.com/n886mj/homepage.html - Original Message - From: "larry flesner" To: "KRnet" Sent: Saturday, January 17, 2004 2:04 PM Subject: Re: KR>Aerocarb / Fuel pressure regulator / FIRE > > > Mark, > > Try the fuel pressure regulator from Auto Zone. The builder of > a Zenith 601 using a Harley engine used one and was able to > get his fuel pressure set to 1 1/2 pounds on the dial to keep > from flooding his carb which I suspect is similar to yours. > The data sheet claims it shuts off when the selected pressure > is reached and apparently just passes fuel at or below the > desired pressure. I have one inline to my 0-200 and it seems > to work well also. > > It goes for $19.95 Cheap enough to try. > > Larry Flesner > > > > ___ > to UNSUBSCRIBE from KRnet, send a message to krnet-le...@mylist.net > please see other KRnet info at http://www.krnet.org/instructions.html
KR>Aerocarb / Fuel pressure regulator / FIRE
Mark said; One is to install a small header fed from my wing tanks or sell the Aerocarb and get another carb. Your other choice is "both of the above." Ron Freiberger mailto: rfreiber...@swfla.rr.com
KR>Aerocarb / Fuel pressure regulator / FIRE
I fought the Carb thing on my first KR, I know, you probably get sick of hearing about my first KR, but that is where I learned what works and a whole lot about what doesn't. I know that it is expensive, but when I put on the Ellison and a Facet, no more problems. Plug and Chug. Mark, You really gave me a start when you yelled FIRE. Man, put the good stuff first, it is out. No more fire and no damage. Man, the blood drained out of my head. See N64KR at http://KR-Builder.org - Then click on the pics Daniel R. Heath - Columbia, SC da...@kr-builder.org See you in Mt. Vernon - 2004 - KR Gathering See our EAA Chapter 242 at http://EAA242.org
KR>Aerocarb / Fuel pressure regulator / FIRE
You are giving all of us Heart Palpitations... Whew.. Tooo close for comfort. I think it's time for an Ellison? Mark Jones wrote: Without thinking about fuel being in the mechanical pump, I hit the switch, engine started, mechanical fuel pump emptied itself all over the engineFIREI almost had a heart attack. Flames were dancing everywhere around the back of the engine. I shut it down, ran to get a fire extinguisher which was about 15 feet away, grabbed it, turned back to the plane and the fire was out. Scott Cable KR-2S # 735 Wright City, MO s2cab...@yahoo.com - Do you Yahoo!? Yahoo! Hotjobs: Enter the "Signing Bonus" Sweepstakes
KR>Aerocarb / Fuel pressure regulator / FIRE
This combination simply will not work. I installed a Holley pressure regulator and hooked it up to the mechanical fuel pump. I also installed a very precise pressure gauge to it. The pressure will maintain a setting when the engine is set at a constant throttle such as 1000 rpm. The engine would run fine at 2 psi. However, when throttle was applied, the fuel pressure would go up to 6 psi flooding out the carb. Now, I am in the fluid control business and these regulators are worthless for our application. What is needed is a modulating pressure regulator. A modulating pressure regulator will keep the pressure constant at any throttle setting. The only thing is, a modulating pressure regulator is big, heavy and not practical for aircraft. So, I removed the Holley pressure regulator and pressure gauge and disconnected the hoses from the mechanical fuel pump. I then placed a tank on top of my front deck and gravity fed the carb just because I wanted to run the engine. Without thinking about fuel being in the mechanical pump, I hit the switch, engine started, mechanical fuel pump emptied itself all over the engineFIREI almost had a heart attack. Flames were dancing everywhere around the back of the engine. I shut it down, ran to get a fire extinguisher which was about 15 feet away, grabbed it, turned back to the plane and the fire was out. No my pants were not wet...but close. After a close inspection of the engine, I saw no damage, even to the wires, so I started the engine up, let it run and thanked God I still had my plane. I have two choices. One is to install a small header fed from my wing tanks or sell the Aerocarb and get another carb. Mark Jones (N886MJ) Wales, WI USA E-mail me at flyk...@wi.rr.com Visit my KR-2S CorvAIRCRAFT web site at http://mywebpage.netscape.com/n886mj/homepage.html
KR>Aerocarb Engine Test
Today the temps here reached 40° so I decided to do some engine testing with a full cowling on the plane. After about two hours of testing, I determined the following about the Aerocarb. If you remember, I had installed a pressure regulator between my stock mechanical fuel pump and the Aerocarb. Today with a very cold engine and using no primer, the engine started right up. I had the regulator set to 1/2 psi and was getting hiccups in the engine. I shut the engine down and changed the pressure to 1 psi. Well, I still got hiccups and actually had the engine stop running as if it were flooding. I simply was not able to get a continuous smooth running engine using the pressure regulator and stock fuel pump. Previously, I had run this set up with good results. Next, I removed the fuel line to the stock fuel pump and regulator and placed a gas can on top of my forward deck and ran a fuel line directly to the Aerocarb for gravity flow. Started the engine and had absolutely no hiccups at any rpm or mixture setting. I have determined the mechanical pump to the regulator to the Aerocarb is an accident waiting to happen. I will not fly that set up. What I will do is install a small header tank connected to the mechanical fuel pump with return lines to my wing tanks and a gravity line to the Aerocarb. I had told a friend of mine down in Alabama that my fuselage was 99% airworthy an that I only needed to complete the outboard wings. Well, this will add a little more building time but it will be a safe fuel arrangement. And I still have set my goal to fly this plane this summer. Oh yea, with the cowl installed and the engine baffles I have, the CHT stayed at 280°. Mark Jones (N886MJ) Wales, WI USA E-mail me at flyk...@wi.rr.com Visit my KR-2S CorvAIRCRAFT web site at http://mywebpage.netscape.com/n886mj/homepage.html
KR>Aerocarb Engine Test
Mark, I also have purchased a Corvair engine for my plane, and as of yet have not settled on carboration. Have you done a pitch up test with the fuel at the lowest level of the header tank? I think this would be appropriate to determine performance during a nose high landing. Also keep us posted on the performance of this carb. All I can say is that there seems to be a lot of trouble getting the right setup. Leigh Plymale flyboy...@adelphia.net - Original Message - From: "Mark Jones" To: "KR Net" ; "Corvaircraft" Sent: Sunday, December 21, 2003 1:33 PM Subject: KR>Aerocarb Engine Test Today the temps here reached 40° so I decided to do some engine testing with a full cowling on the plane. After about two hours of testing, I determined the following about the Aerocarb. If you remember, I had installed a pressure regulator between my stock mechanical fuel pump and the Aerocarb. Today with a very cold engine and using no primer, the engine started right up. I had the regulator set to 1/2 psi and was getting hiccups in the engine. I shut the engine down and changed the pressure to 1 psi. Well, I still got hiccups and actually had the engine stop running as if it were flooding. I simply was not able to get a continuous smooth running engine using the pressure regulator and stock fuel pump. Previously, I had run this set up with good results. Next, I removed the fuel line to the stock fuel pump and regulator and placed a gas can on top of my forward deck and ran a fuel line directly to the Aerocarb for gravity flow. Started the engine and had absolutely no hiccups at any rpm or mixture setting. I have determined the mechanical pump to the regulator to the Aerocarb is an accident waiting to happen. I will not fly that set up. What I will do is install a small header tank connected to the mechanical fuel pump with return lines to my wing tanks and a gravity line to the Aerocarb. I had told a friend of mine down in Alabama that my fuselage was 99% airworthy an that I only needed to complete the outboard wings. Well, this will add a little more building time but it will be a safe fuel arrangement. And I still have set my goal to fly this plane this summer. Oh yea, with the cowl installed and the engine baffles I have, the CHT stayed at 280°. Mark Jones (N886MJ) Wales, WI USA E-mail me at flyk...@wi.rr.com Visit my KR-2S CorvAIRCRAFT web site at http://mywebpage.netscape.com/n886mj/homepage.html ___ see KRnet list details at http://www.krnet.org/instructions.html
KR>Aerocarb Engine Test
Actually, in a gravity flow situation, I have had no problems running my engine. Besides, the Aerocarb is a gravity flow carb. I was trying to run without gravity (under pressure). I have held the tail to the ground, which is a fairly high pitch and she ran fine. Mark Jones (N886MJ) Wales, WI USA E-mail me at flyk...@wi.rr.com Visit my KR-2S CorvAIRCRAFT web site at http://mywebpage.netscape.com/n886mj/homepage.html - Original Message - From: "Leigh Plymale" I think this would be appropriate to > determine performance during a nose high landing. Also keep us posted on the > performance of this carb. All I can say is that there seems to be a lot of > trouble getting the right setup.
