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Just because of the size of the engine, you have no way of knowing the
compression ratio of the engine and as such you must measure everything
and then correct the compression ratio for your needs like I did on the
'S' motor. As the case had been faced on the mating halves, the cylinder
seating surfaces and the heads had been cut plus I cut the tops off of
the barrells for a better seat to the head my CR was no where near
anything I wanted. Plus I hemi cut the heads. Remember this is a 1600cc
motor (85.5mm). I ended up having the heads cc'd to 0.1cc and correcting
it all with cylinder shims which is normal practice these days. I always
check the CR of all my engines and have not had an over heating
problem/detonation problem with any of them. I even tried 6.5:1 on a
test 1776cc for a while like Gene Berg likes and it ran so cool my temp
gauge didn't move. I then upped it to 7.5:1 which is what it still is
today with an Engle 110 etc etc but converted to upright as it is now in
a T2. The temp did go up to what everybody else has here but then so did
the power. There is a fine line between reliable power and engine
destruction. Look at 94mm cylinders too, they are not as thin as people
will have you believe. 92mm cylinders are best avoided when compared to
the 94mm units available. Still not a patch on my Okrassa 90mm's
though....
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| Aaron Britcher MOBILE: 0418 807 160 |
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