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Scott 1. I am afraid I don't know what that is! Can you please describe? 2. Yes. The readings I am quoting are true readings from an optical tach, not the readings from my mechanical tach, which reads high. 3. Yes. Thanks Eliacim Quoting scott <[EMAIL PROTECTED]>: > ----[Please read http://ercoupers.com/disclaimer.htm before following any > advice in this forum.]---- > > > Have you performed: > > 1. A leakdown test? > 2. Verified the tachometer? > 3. Did your plane ever make the rpm w/that prop? > > > ----- Original Message ----- > From: "Hartmut Beil" <[EMAIL PROTECTED]> > To: <[EMAIL PROTECTED]>; <[email protected]> > Sent: Monday, July 24, 2006 7:07 AM > Subject: Re: [COUPERS-TECH] Low power saga > > > > ----[Please read http://ercoupers.com/disclaimer.htm before following any > advice in this forum.]---- > > > > > > Eliacim. > > You are stating in your initial summery that besides replacing one > cylinder, > > you also replaced quiet a few things on the ignition system. > > > > Like previously mentioned. I'd replace the things that got changed with > > known good ones first. > > > > E.g. replace both magnetos and ignition harness with a good known used > one. > > Borrow one from a good running plane. > > > > Then second, John Cooper mentioned that the pushrods might be exchanged on > > cylinder 1, resulting in not allowing cylinder 1 breath as much as needed > > for higher RPM. Has that been checked? > > > > Hartmut > > > > > > > > > > > > ----- Original Message ----- > > From: <[EMAIL PROTECTED]> > > To: <[email protected]> > > Sent: Monday, July 24, 2006 3:46 PM > > Subject: [COUPERS-TECH] Low power saga > > > > > > > ----[Please read http://ercoupers.com/disclaimer.htm before following > any > > > advice in this forum.]---- > > > > > > > > > > > > Update on low power problem > > > > > > As you may recall, my C-75 is not reaching static RPM after the > following > > > work: > > > cylinder 1 was removed and reinstalled to replace a helicoil, installed > a > > > new > > > ignition harness, 5 new plugs, a new magneto gear and a new impulse > > > coupling. > > > > > > RPM maxes out around 1800 RPM (sometimes higher, sometimes lower)and the > > > engine gets a little rough. If I pull the mixture full out (lean), RPMs > > > increase about 100 RPM, indicating the engine is running rich. As the > > > engine > > > gets warmer, RPMs drop further. > > > > > > While troubleshooting this we have found / done the following: > > > a. primer is not leaking > > > b. intake gasket on cyl 1 is in place and not obstructing air intake > > > c. mixture plates have been cleaned several times > > > d. Spark plugs were tested and cleaned > > > e. carb heat box has been inspected for proper operation > > > f. Mixture, carb heat, and throttle control travel and operation are > fine > > > g. fuel flow from header tank to carb is unrestricted > > > h. Magneto timing was checked like 3 times. > > > i. Compression is good on all 4 cylinders. > > > j. throttle cable is not slipping > > > k. replaced air filter > > > > > > You have read most of that in my previous postings. What follows is an > > > update. > > > > > > 1. Installed the carburetor after a second A&P disassembled and cleaned > > > it. > > > Same problem. > > > 2. Borrowed a good spare carburetor from yet a third A&P, installed it. > > > Same > > > problem. > > > 3. Opened Cylinder 1 valve cover and switched the pushrods around. Same > > > problem. > > > > > > As hard to believe as it is, I think we can rule out the carburetor. > > > > > > My A&P gave up and told me to contact the third A&P and have him > > > officially > > > take my case. However, the third A&P is in another airport... Not like I > > > can > > > tow my plane there... > > > > > > All that's left in the Contiental troubleshooting list is: > > > scored valve stems, warped valves, worn cylinders, pistons and/or > pistion > > > rings, worn cam lobe... > > > > > > I will do whatever the third A&P tells me to do, but I will also > > > appreciate > > > any more ideas from the Ercoupe group. > > > > > > Regards > > > > > > Eliacim Cortes > > > > > > > > > > > > > > > > > > -- > > > This message has been scanned for viruses and > > > dangerous content by MailScanner, and is > > > believed to be clean. > > > > > > > ============================================================================ > == > > > To leave this forum go to: http://ercoupers.com/lists.htm > > > > > > > > > > > > > > > ============================================================================ > == > > To leave this forum go to: http://ercoupers.com/lists.htm > > > > > > > > > > __________ NOD32 1.1677 (20060724) Information __________ > > > > This message was checked by NOD32 antivirus system. > > http://www.eset.com > > > > > > ============================================================================== > To leave this forum go to: http://ercoupers.com/lists.htm > > > > -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean. ============================================================================== To leave this forum go to: http://ercoupers.com/lists.htm
