KR> Compression
GP minimum recommended octane is 92 for the 2180 VW. Does not matter which, autogas or 100LL, as long as you use 92 octane or higher. Then there is the lead deposit issue with 100LL and the Ethanol issue with the autogas. Sid Wood Tri-gear KR-2 N6242 Mechanicsville, MD, USA > Doran, > I don't think you'll find an absolute answer to that. But if you want to > run autogas from the pump, you need to have a lower compression ratio > somewhere around 7.5:1. Higher compression ratios are fine, but you need > to run 100LL. I believe 8:1 is normal for a GP engine. > > Rob Schmitt > Revmaster 2100D > KR2S > N18562Z > > Hello folks, I need to call Great Plains and get the manual sent to me but > in the meantime does anybody know if the recommended compression for the > 2180 conversion? > Doran >N186RC > ___ >
KR> Compression
You will get 100 different answers if you ask 100 people here. Best to call GPAS and ask Steve and he can tell you for each engine size what he would recommend for whatever minimum octane you plan to use.
KR> Compression
Doran, I don't think you'll find an absolute answer to that. But if you want to run autogas from the pump, you need to have a lower compression ratio somewhere around 7.5:1. Higher compression ratios are fine, but you need to run 100LL. I believe 8:1 is normal for a GP engine. Rob Schmitt Revmaster 2100D KR2S N18562Z -Original Message- From: Doran Jaffas via KRnet To: krnet Sent: Tue, May 6, 2014 5:51 am Subject: KR> Compression Hello folks, I need to call Great Plains and get the manual sent to me but in the meantime does anybody know if the recommended compression for the 2180 conversion? Doran N186RC ___ Search the KRnet Archives at http://tugantek.com/archmailv2-kr/search. To UNsubscribe from KRnet, send a message to KRnet-leave at list.krnet.org please see other KRnet info at http://www.krnet.org/info.html see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change options
KR> Compression
8:1 On Tuesday, May 6, 2014 5:51 AM, Doran Jaffas via KRnet wrote: Hello folks, I need to call Great Plains and get the manual sent to me but in the meantime does anybody know if the recommended compression for the 2180 conversion? ? ? ? ? ? ? ? Doran ? ? ? ? ? ? ? ? N186RC ___ Search the KRnet Archives at http://tugantek.com/archmailv2-kr/search. To UNsubscribe from KRnet, send a message to KRnet-leave at list.krnet.org please see other KRnet info at http://www.krnet.org/info.html see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.orgto change options
KR> Compression
Hello folks, I need to call Great Plains and get the manual sent to me but in the meantime does anybody know if the recommended compression for the 2180 conversion? Doran N186RC
KR> compression
No, but that does not necessarily mean that the engine is bad. May be as simple as a valve adjustment. See N64KR at http://KRBuilder.org - Then click on the pics See you at the 2011 - KR Gathering in Mt. Vernon, Il - MVN There is a time for building and it never seems to end. Daniel R. Heath - Lexington, SC -Original Message- I'm new and currently interested at buying a KR-2 and I was wondering 2 things. The compressions are 58, 71, 73, 75 is this good?
KR> compression ratio and detonation
Glenn Martin wrote: >> Mark. According to the dyno software I downloaded the difference between HP at 8:1 and 9:1 in a 2180 was negligible. So what other considerations are there? << As I mentioned the other day, it's not a linear function, and not worth "eeking" out the last drop of power at the risk of reliability and safety. The difference in the 136 hp with 9.35:1 vs 8:1 is 8 hp, or 6%, according to Dyno2000 software. So it's not negligible to me, but it's certainly not worth killing yourself over... Mark Langford ML at N56ML.com website at http://www.N56ML.com
KR> compression ratio and detonation
Mark Langford wrote: > I think Steve Bennett recommends CRs down in the lower and mid 8:1 range, > and that's probably because he's dealing with some lowest common denominator > folks who are on a budget and don't see the need for EGT or CHT > indications... > Mark. According to the dyno software I downloaded the difference between HP at 8:1 and 9:1 in a 2180 was negligible. So what other considerations are there? -- Glenn Martin KR2 N1333A Biloxi, MS, 39532 rep...@martekmississippi.com
KR> compression ratio and detonation
Brooks Townsend wrote: >> So, Mark, are you saying that even with the EIS that you have, you'd go >> down to 9:1?? What if you had a less sophisticated monitering system... >> would you further reduce the c/r??? How much?? << Yep, I've done the takeoff-with-detonation thing way too many times already, and that was burning 93 octane auto fuel. From what I can tell, there are places in this country where 91 octane is about as good as you can get, and even then it's likely to have ethanol in it. Theoretically ethanol shouldn't matter because octane rating is simply a measure of the overall resistance of a fuel to detonation, but I've noticed that ethanol narrows the band in which my engine is "happy" in cruise. With normal auto fuel I can fly with the lowest LED of my air fuel ratio meter blinking on and off, and the engine's fine with that lean setting. A little leaner and the power drops off more than the fuel saving, which is why I fly it there. Running 10% ethanol, the engine is only happy with about three LEDs showing before the RPM drop is considerable and noticeable, so I'm burning a good bit more fuel. When I put 100LL in it, I can run way down past the point of any LEDs showing at all, so 100LL saves fuel over 93 octane auto fuel...not a lot, and certainly not enough to offset the cost or the increased lead deposits with leaded fuel, but it's a real observation. Hopefully there will not be the usual theoretical arguments over why this isn't true...it's based on real and repeated observations, and Joe Horton has seen the same thing. To answer your question, I'd feel naked to fly with any less instrumentation than an EIS or equivalent. Knowing the CHT of only one or two cylinders, and not having a bright light flashing between my eyes and a warning tone in my headsets that one particular cylinder has a skyrocketing CHT, I'd have already been down in the trees on several occasions. Yes, the engine runs a little rough and is low on power when detonating, but by the time you've screwed around with carb heat, mixture, fuel supply, alternate ignition, your hands are shaking, and your piston is melted and seized, you are going down. Let's see...a thousand bucks and a couple of extra pounds, or my plane destroyed in the treesthat's a pretty good trade! A lot is said about heavy planes. Mine's heavy, but a lot of that is "safety" features like the EIS, redundancy where it makes sense. I think Steve Bennett recommends CRs down in the lower and mid 8:1 range, and that's probably because he's dealing with some lowest common denominator folks who are on a budget and don't see the need for EGT or CHT indications... Mark Langford ML at N56ML.com website at http://www.N56ML.com
KR> compression check, service ceiling
NetHeads, I checked my compression yesterday, just for checkup purposes. First I did the usual automotive type test, and most are right around 170 psi, with one exception...191psi on number 5. I guess there's a buildup in there of some kind. My engine has a 9.4:1 compression ratio. I then I did a differential compression test, and (although I don't expect anybody to actually believe this), I got six 80/80's! Mine are usually pretty good, but that's a first for me. This particular incarnation is the 3100cc that I built to take William's fifth bearing, which now has 143 hours on these rings. The sparkplugs looked pretty good too. See http://home.hiwaay.net/~langford/corvair/misc/091122350m.jpg . Not too bad, but still showing the right bank is running a tad leaner than the pilot's bank, probably because the throttle slides open from pilot's side to passenger side. These are lined up #6 through #1 left to right. Last weekend I flew to Arkansas, and got bored and did some testing along the way. Since I had to climb to 11,500' to get over Memphis Center anyway, I decided to go all the way to 17,000' and get a climb rate number (and yes, I did have oxygen). For the last 500' (16,500 to 17,000), the average was 230 ft/min, so the service ceiling (which is defined as the highest altitude at which 100 ft/min climb rate can be maintained) is considerably higher than 17,000'. My wings are shorter than any other KR2S that I know of (19'), but I usually fly at 1000 pounds, and I do have a pretty strong engine. One of these days I hope to add on to the wing tips and get a little more wing area out of it. I took a new sunset photo the other day, at the top of http://home.hiwaay.net/~langford/sunsets/ . Not my best, but a flying picture, at least. The fall colors picture just below it may be the last picture my old Canon 300D will ever take. After about 73,000 pictures over a seven year period, the shutter mechanism finally wore out. The mirror was stuck halfway open and the curtain wouldn't open when I tried to take a picture. Well see what Canon has to say about that, but meantime I've bought a Canon 7D... Mark Langford N56ML "at" hiwaay.net website at http://www.N56ML.com
KR> compression readings
What should the compression readings be on an 1835 VW engine? I'm getting 110psi per cyl. using an auto gauge. -- Paul KR2 Stretched Derry, NH
KR> compression readings
interesting well at atmosheric pressure 15 psi and 8-1 compression ratio equates to about 120 psi what is your compresion ratio i wonder there are othe r factors like cam timing doing it with open throttle as aopsed to closed throttle phill - Original Message - From: <airgu...@comcast.net> To: "KR List" <kr...@mylist.net> Sent: Sunday, March 04, 2007 3:03 AM Subject: KR> compression readings > What should the compression readings be on an 1835 VW engine? I'm getting > 110psi per cyl. using an auto gauge. > > -- > Paul > KR2 Stretched > Derry, NH > ___ > Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp > to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net > Post photos, introductions, and For Sale items to > http://www.kr2forum.com/phpBB2/index.php > please see other KRnet info at http://www.krnet.org/info.html > > > -- > Internal Virus Database is out-of-date. > Checked by AVG Free Edition. > Version: 7.5.410 / Virus Database: 268.17.15/659 - Release Date: > 30/01/2007 09:31 > > -- I am using the free version of SPAMfighter for private users. It has removed 25474 spam emails to date. Paying users do not have this message in their emails. Get the free SPAMfighter here: http://www.spamfighter.com/len
KR> Compression s the key, and something like Cyberview will allow
Mark, Have you ever heard of IrfanView? www.irfanview.com and it is free. It is what I use to make all my thumbnails and size all my pics. It is easy to use, does batch rename and compression. "There is a time for building and a time for flying, and the time for building has long since expired." See N64KR at http://KR-Builder.org - Then click on the pics Daniel R. Heath - Columbia, SC See you in Mt. Vernon - 2004 - KR Gathering
KR> Compression s the key, and something like Cyberview will allow
Dan Heath wrote: > Have you ever heard of IrfanView? www.irfanview.com and it is free. It > is what I use to make all my thumbnails and size all my pics. It is easy to > use, does batch rename and compression. Yes, I have. It's great stuff, and regarded as the defacto free image viewer in the digital photography world. I didn't know it also did compression (maybe that's relatively new), but I'd say there's your free software that I was talking about. I haven't used it much, but if you can't find "compression" anywhere, it may be that you have to "save as" for that screen to appear (at least that's how Photoshop works). The neat thing about Cyberview is that you can use sliders to see the effects of compression real time, and maybe Irfanview does something similar. Once you get the hang of it though, you'll know exactly what to compress it to without having to look. I save all of mine to 3 on a scale of 10 in Photoshop. By all means, use Irfanview. It's highly recommended. My 640 x 480 photos usually end up around 25-35k, and that's good enough for web work... Mark Langford, Huntsville, Alabama N56ML "at" hiwaay.net see KR2S project at http://home.hiwaay.net/~langford
KR> Compression s the key, and something like Cyberview will allow
Mark, I also have PhotoShop but find IrfanView much easier to use for the purpose stated. All you have to do is, open your folder with the pics in it, drag one of the pics onto your IrfanView icon on your desktop, click on File, Batch Conversion/rename. From there it is a piece of cake. "There is a time for building and a time for flying, and the time for building has long since expired." See N64KR at http://KR-Builder.org - Then click on the pics Daniel R. Heath - Columbia, SC See you in Mt. Vernon - 2004 - KR Gathering
