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Richard. You did not indicate what brand propeller you have, but it seems like the 71-48 McCauley is suitable for a C-75 installation. See the Type Certificate: Propeller - fixed pitch metal, McCauley 1A90CF or 1B90CM 26 lb. (-32) (a) With Continental C-75 series engines only static r.p.m. at maximum permissible throttle setting: not over 2100, not under 1950. No additional tolerance permitted. Diameter: not over 73 in., not under 71 in. Also the cowling rails are attached to the airframe with what it looks to me adjustable pieces that allow for a proper adjustment. Instead of using spacers, which by the way are not clear to me where spacers are of help in a too tight fit, just loosen the bolts that are holding the attachment hardware to the cowling rails. Adjust , retighten. Done. Vibration can be caused by many other things too. Prop being one, more to that here: http://www.sacskyranch.com/eng.htm Look for rough or vibration, to advise on the rough problem one would need a little more history like had it ever been run smooth or so. Hartmut ----- Original Message ----- From: "richard logston" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]>; "AJ DeMarzo" <[EMAIL PROTECTED]> Cc: "Ctech" <[email protected]> Sent: Monday, January 29, 2007 7:58 PM Subject: Re: [COUPERS-TECH] engine help > ----[Please read http://ercoupers.com/disclaimer.htm before following any > advice in this forum.]---- > > > Ercoupe Guru's. I have a young fellow in the hanger next to me who also owns > an ercoupe with a 75hp continental that has been majored with new millennium > cyl.pistons, rings, push rods etc. The aircraft has been a thorn in his side > expense wise. The aircraft has been in a repair shop for over a year, wings > off, all center section rivets electronically checked, main fuel tank leak > repaired,. tail section removed, cleaned up installed with new bolts. Other > repairs as needed.The engine installed with new millennium cyl. Test flying > shows a vibration level that is not acceptable. He has tried the prop in > different positions to no avail. this was none at a dynamic balance shop. I > think he said he had a figure of 1.7, the mechanic said that was high and > the best he could do.Needles to say he is at his wits end over this.He has > talked to several aircraft mechanics about this problem, and no one has been > able to solve this problem yet. He also has a clearance problem with the > nose bowl protruding too far forward rubbing the prop, a aluminum spacer was > added to maintain clearance. I guess my question on this issue is can one > cut back the cowling rails with out running into other problems. This is not > an isolated problem as I have some propeller marks on my nose bowel that > dates back sometime in the past. I guess my question is has anyone run into > this problem before and the cure. Sometime as individuals we may not be able > to solve problems, but bringing a group knowledge base together can. Thank > you in advance for my friend Richard L. 3041H PS. I would loan him my prop > to try but I have a 85hp with a 71-48. > ----- Original Message ----- > From: <[EMAIL PROTECTED]> > To: "AJ DeMarzo" <[EMAIL PROTECTED]> > Cc: "Ctech" <[email protected]> > Sent: Monday, January 29, 2007 6:49 AM > Subject: Re: [COUPERS-TECH] engine help > > > > ----[Please read http://ercoupers.com/disclaimer.htm before following any > > advice in this forum.]---- > > > > > > - 8 No provision for starter or generator > > - 12 Starter, Generator and Associated parts installed > > - 14 Lord Engine mount bushings installed. Otherwise, like -12 models > > - 16 Vacuum pumpo adapter. Otherwise like -12 models > > > > F Flange type crankshaft installed (replaces tapered shaft) > > H Crankcase and crankshaft adapted to feed oil to controllable pitch > > propeller > > > > Eliacim > > N87071 > > > > > > > >> ----[Please read http://ercoupers.com/disclaimer.htm before following any > >> advice in this forum.]---- > >> > >> > >> The "dash" numbers always confuse me. Isn't the -12 the engine with the > >> vacuum pump? I thought we had the -8 but it's early and I haven't fully > >> awakened. > >> > >> ----- Original Message ----- > >>> [EMAIL PROTECTED] wrote > >>>> I'm looking for an STC or 337 for installing a C-85-12 in a 415-C? Can > >>>> anyone help? > >> > >>> Ed, > >>> I believe that no 337 is required. Refer to the type certificate for the > >>> 415-C (A718 Item 110.). > >>> > >>> John Roach > >>> N 2427H > >> > >> ============================================================================== > >> To leave this forum go to: http://ercoupers.com/lists.htm > >> > >> > >> > >> > > > > > > ============================================================================== > > To leave this forum go to: http://ercoupers.com/lists.htm > > > > > > > > > > > ============================================================================== > To leave this forum go to: http://ercoupers.com/lists.htm > > > > ============================================================================== To leave this forum go to: http://ercoupers.com/lists.htm
