What is the oil temperature when this is happening?
Check the accuracy of both the pressure and temperature gauges. If you really have 21 psi at cruise RPM, ground the plane. The limit is 30 psi. The multi vis argument as presented doesn't hold water. Multi-vis oils thin out less as they heat up, not more. However, they do start with thinner base stock. If you are using (say) 20W-50 oil it will have the same viscosity at 212 degrees F as straight 100 wt. The C75 should be grounded also. 21 psi is insufficient to adequately lubricate the engine. John Cooper Skyport Services 4996 Delaware Tnpk Rensselaerville, NY 12147 518 797-3064 www.skyportservices.net _____ From: [email protected] [mailto:[EMAIL PROTECTED] On Behalf Of cpetemn Sent: Monday, June 23, 2008 4:34 PM To: [email protected] Subject: [ercoupe-tech] oil pressure As I've flown my C-85 coupe more these hot days, I have noted that when I first start the engine, oil pressure is in the 30-40 lb range. Then after I am at cruise, it runs at about 21 lbs or in the middle of the caution range. I asked my a&p and he thinks it probably has to do with the multi-vis oil warming up and the ranges were set long before multi-viscosity was available. He also has another customer with a C-75 coupe that runs in the same range. So what oil pressure does your coupe sit at when cruising? Craig Peterson N87018 #191 btw, solved the brake problem where the pedal needed adjustment and was binding a bit.
