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                           Engines-List Digest Archive
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                     Total Messages Posted Wed 01/14/04: 1
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Today's Message Index:
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     1. 05:56 AM - Re: Alternate engines  (Gary Casey)
 
 
 
________________________________  Message 1  _____________________________________


Time: 05:56:17 AM PST US
From: "Gary Casey" <glcasey@adelphia.net>
Subject: Engines-List: RE: Alternate engines

--> Engines-List message posted by: "Gary Casey" <glcasey@adelphia.net>

<<I agree the BB chevy could handle the radial loads but I don't know
about longitudinal loading. It was never designed for the push/pull of the
prop.>>

My calculations showed about 350 psi thrust bearing loading at cruise
conditions.  I believe that it will survive, especially if a little extra
oil flow was directed to the appropriate surface, but I have no empirical
data.  There have been a number of engines that have run successfully with
props direct-mounted, but I don't know of one with that horsepower.  Some
have been run with a crank extension that was mounted in its own bearings,
but that increases the cost and weight considerably.  Note that the
capability for a hydrodynamic bearing to support load goes up dramatically
with speed and the V8 is designed to withstand the clutch thrust load at
idle speed.  Taking the rpm into account the prop thrust is less, but that
isn't a guarantee.  The gyroscopic precession loads are probably the most
severe and that's why I wouldn't tempt fate by putting an aluminum prop on
it.

Gary Casey