Oh, a few other things I forgot. Obviously oil pressure is prety dependent on temperature. When my temp is high at the top of a climb my pressure can be 10 PSI lower than after the oil has cooled in cruise flight. RPM also make a big difference.
Another problem that can bring down your pressure sometimes is the valve not seating correctly or some crud in the valve. I can't rember what the VW plunger is like, but some have a hollow end where the spring goes. You can stick it on the end of a dowel and lap it to the seat in the case when you get scratches and nicks in the case that cause it to not seat correctly. At the least, if you are having low pressure problems pull the plug on the bottom of the engine and take a good look at the face of the plunger, the seat in the engine, and the spring. The VW also has two valves. The springs and plungers are different for each one and it is easy to mix them up. I can't find my Great Plains manual right now so i can't tell you shich parts go where or why there are two valves. Brian Kraut Engineering Alternatives, Inc. www.engalt.com -----Original Message----- From: krnet-boun...@mylist.net [mailto:krnet-boun...@mylist.net]On Behalf Of Brian Kraut Sent: Wednesday, November 15, 2006 9:35 PM To: KRnet Subject: RE: KR> Oil Temp? The oil pressure is boosted by changing the spring in the oil pressure regulator. You can also get the same effect by putting a washer or two under the spring. That is even an accepted practice on certified engines. I have seen people put too many washers in trying to boost pressure on engines that are just plain worn out and that eventually weakens the spring and lowers the pressure. There are also adjustable regulators with a screw you turn that adjusts pressure on the spring. Since you have a relatively new engine if you are having low oil pressure problems you may just buy a new spring and try that. Let Steve know what oil pump you have, what you have in the way of external lines, cooler, filter, etc. and see if he recommends a bigger pump, a different spring, or a few washers. Some Lycoming engines have a pressure control valve that bypasses oil from the oil cooler when the pressure is high as in the oil is cooler and thicker. The better Lycoming valve is a Vernatherm. That is an actual thermostatic control valve that bypasses oil based more on temperature than pressure. Both do a fair job of keeping a somewhat even oil temp, but you do see more than a 10 degree variation on hot or cold days and depending on power settings, etc. My O-200 does not have an oil cooler and I see a difference of 20 degrees or more between a hot day down low or a cool day an up high with lower power settings. Also keep in mind that your oil temp will not change all that quick. On the top of a climb in my Mustang my temp can be 20 degrees hotter than normal and it can take 15-20 minutes after leveling off and picking up speed before it comes back down. My Pacer with the cooler and the valve takes a good 10 to 15 minutes to come down 10 degrees after a climb. Brian Kraut Engineering Alternatives, Inc. www.engalt.com -----Original Message----- From: krnet-boun...@mylist.net [mailto:krnet-boun...@mylist.net]On Behalf Of Dan Heath Sent: Wednesday, November 15, 2006 8:00 PM To: kr...@mylist.net Subject: KR> Oil Temp? I looked over the specs for the oil temp on my GPASC 2180. It says that cruise temp is supposed to be between 190 and 200 degrees. That is 10 degrees of variance. Does this seem reasonable when the OAT can vary magnitudes more than that? Does anyone have a device to control the temp to such a fine tolerance? What are you using for your specs for oil temp in cruise? I found out about an oil pressure booster for this engine. Has anyone ever used such a thing? It costs all of $8 and is easy to install. See N64KR at http://KRBuilder.org - Then click on the pics See you at the 2007 - KR Gathering There is a time for building and a time for FLYING and the time for Flying has begun. Daniel R. Heath - Lexington, SC _______________________________________ 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
