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Grant, before you do anything check your tachometer, while doing dynamic propeller balancing I find most tachometers read low. If you find that your tach is correct then you need to check the pitch on the propeller. I am at 4400 feet msl and with the 74/50 prop I got 2575 with the 85. Jim N87349 [EMAIL PROTECTED] wrote: > ----[Please read http://ercoupers.com/disclaimer.htm before following any advice in this forum.]---- > > Coupers. > I have a 1946 415C with an 85HP , the book says the RPM should > be 2575. When I bought the plane it had a 74-48 prop. and was a > 75HP that would turn 2275 RPM, as the book said. We changed > the venturi and jet, now I get 2350 RPM, We are at 3500 GL. > Are we overlooking something to gain the extra 225 RPM or am > I shooting to high. Would really appreciate any comments. > Thanks Grant & N13CL > ==^================================================================ This email was sent to: [EMAIL PROTECTED] EASY UNSUBSCRIBE click here: http://topica.com/u/?aVxiLm.aVzvvT Or send an email to: [EMAIL PROTECTED] T O P I C A -- Register now to manage your mail! http://www.topica.com/partner/tag02/register ==^================================================================
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