<VV> Corvair overhead cam engine

[jvhroberts at aol.com]

The first Subaru OHC engines used two belts, with LOTS of problems. All their other engines use one belt, the present generation 6 cylinder being chain driven. The 4 valve engines use idlers to get lots of belt wrap, and the present change interval is over 100K miles. And there's LOTS of idlers, etc., on the present Subaru engines, two either side of the crank sprocket, giving 180º of wrap, and an S wrap around the oil pump, etc. One belt is by FAR the more common practice. 


-----Original Message-----
From: Clark Hartzel <chartzel at comcast.net>
To: 'Virtual Vairs' <virtualvairs at corvair.org>
Sent: Thu, 22 May 2008 10:02 am
Subject: <VV> Corvair overhead cam engine



It is unlikely that one belt drove both heads.  I believe a belt drove
he right side and another belt drove the left side.  If you only had
ne belt you wouldn't need two adjusters!  In my machine tool days we
sed a standard that you need 7 teeth engaged on a timing belt drive to
ransmit the load.  We usually tried for more teeth but 7 would do.
lark Hartzel
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