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-   -   differences between 964 & 993 longblocks??? (http://forums.pelicanparts.com/porsche-911-technical-forum/281815-differences-between-964-993-longblocks.html)

fastbacker 05-09-2006 10:12 AM
differences between 964 & 993 longblocks???
 
Just wondering what the differences between the early and late model air cooled 3.6 longblocks are?

Thanks-
Craig Backer

Bill Verburg 05-09-2006 10:19 AM
Obviously the crank rods and pistons are different, the 993 has the block mounted oil filter which can be adapted w/ some difficulty to the 964 block, the heads are a different alloy, ports and valves are smaller on 964.

fastbacker 05-09-2006 10:50 AM
Quote:
Originally posted by Bill Verburg
Obviously the crank rods and pistons are different
Not trying to be a smartass, but why's that obvious?

Thanks-
CB

randywebb 05-09-2006 11:03 AM
take a look at Aichele's engine book & at Frere -- at some point they used CAE to redesign the valve train and reduce recip. masses

Bill Verburg 05-09-2006 11:38 AM
Quote:
Originally posted by fastbacker
Not trying to be a smartass, but why's that obvious?

Thanks-
CB
Maybe it's just obvious to me. The 964 has a harmonic balancer on the snout and 993 doesn't


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