God you know how I like to argue! According to Lee at Skyport, and their sample 337 form, 75 hp uses 7351 prop. 85 hp uses 7150 for standard-cruise, and 7148 for take-off, climb, and high altitude. No mention of 7146 prop. Max RPM for 75 hp is 2275, and 85 hp is 2575. Once again, according to Skyport, to change from a C75 to a C85, requires a new engine baffle kit, and one of the following: if you have a Stromberg carb, it requires a 1 3/8" Venturi, and a p7881-45 Jet. If you have a Marvel-Scheibler Carb, Model a10-4240, no changes in carb required. I assume the 1 3/8 venturi is what you're referring to. What size in the C75, and why is no change required if you have a Marvel?
Larry John Cooper wrote: > In a message dated 99-12-29 10:18:32 EST, you write: > > > As you know, the only > > significance between the 75 and the 85 is the RPM. The prop is what gives > > you the > > extra revs. I would think that going down to a 46 would mean you really > > have to watch > The C-75 has a smaller carburator throat. That is the ONLY physical > difference and the 75 simply can't breath well enough to make 85 hp, no > matter how high you get it to rev. (finer pitch results in lower prop > loading so your higher revs are at reduced manifold pressure, hence lower > power.) Continental approved conversion to 85 HP: change carb. > > Many C-85 installations call for the 7148 as the standard prop. 46 is climb > and 50 is cruise. > > John > > __________________________________________________________________________ ______ > To unsubscribe from this list please send mail to [EMAIL PROTECTED] > > _____________________________________________________________ > Get your favorite topic delivered daily. > http://www.topica.com/t/11 __________________________________________________________________________ ______ To unsubscribe from this list please send mail to [EMAIL PROTECTED] _____________________________________________________________ Get your favorite topic delivered daily. http://www.topica.com/t/11
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