Ditto....my C-85 runs 10-15 lbs hot idle and 30-35 lbs. hot at cruise. Has for many years. Not a problem, quit worrying and enjoy your Coupe. Jim N-87112 -----Original Message----- From: Claude Wheelbarger <[EMAIL PROTECTED]> To: COL HERBERT K SLOANE <[EMAIL PROTECTED]>; [EMAIL PROTECTED] <[EMAIL PROTECTED]> Date: Saturday, July 10, 1999 9:58 PM Subject: Re: I need help!
> >My C-85 engine with approximately 650 hours since (questionable) major >>indicates oil pressure no higher than 25 (on the line between yellow and >>green) at cruising altitude of 2500 ft. > >Not a problem and not uncommon at all for the 75/85's. My factory overhauled >engine new out of the crate >whjen hot (oil temp 170-200) only gives up 10-15 at idle and 25-30 at 2500 >RPM. After frantic calls to the factory I am told that is normal for our >engines and the 0-200's are not much better. The rep said the engine would >run out a normal life easily with only 20 lbs of pressure at cruise since >the engine needs more volume of oil vs pressure. He said 15lbs would even do >if the volume was there and that the engines were designed with large oil >galleries and passages as to NOT be dependent on higher pressures. > >>My mechanic has changed the >>spring in the oil pressure relief valve and added two shims. He has also >>reamed out the aluminum case where the oil relief valve fits for better >>seating.... all to no avail. I'm afraid to continue flying the plane for >>fear that the low oil pressure reading will cause permanent damage to >>the engine so my lovely ERCOUPE sits and waits for relief while I boil! >>Other than a complete major which is prohibitive at the moment can >>anyone offer suggestions for solving the problem? >> >Just fly the plane. The bottom line I got from the rep was unless the >pressure fell below 15lbs under full throttle >or 5-7 at a 750 rpm idle there was no chance of damage to the engine. When >asked how low it could run and still not fail inflight I was informed that >the engines had been tested at 10lbs @ 2500 rpm for extended run times and >never had a failure. Then he suggested I check with other owners of small >continentals about their pressures. Most were at the same level if not a bit >lower. Now I fly happy! Just for the record my WAY PAST tbo engine I sent >back ran out it's last 1200 hours with about 18-20 at cruise and about 8 at >idle. > >Hope this helps! > >Claude Wheelbarger >six-two-zero >W13 >
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