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8/9/04
QUESTION
1:
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I had a
conversation with a fellow racer the
other day about his engine combo.
He said that he went with a 540 BBC
instead of a 572 C.I. engine because
of the difference in "oil timing?"
I know there is a difference in the
stroke 4.25" -vs- 4.5",
but what does that have to do with
the oil?
John Maverick
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Dear John,
I’m not sure what he means by “oil
timing.” What I see as a potential problem
with the longer stroke is oil foaming. Sometimes
if you run a big stroke engine with a regular
sump type pan the windage in the pan will resemble
hurricane Hugo! This is a bad thing and can
cause oil pressure losses and other assorted
carnage. The cure is a deeper pan to keep the
oil away from the rotating assembly or preferably
a dry-sump system.
Hope this helps,
Jay
QUESTION
2:
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I noticed in
one article you said that you can
run a higher compression ratio on
a blown engine with aluminum cylinder
heads because the aluminum head
will sync away more heat. My question
is what would be a safe compression
ratio for a blown Ford 302 motor
with aluminum heads and about 8
lbs. of boost?
Thanks,
C. Bass Jr.
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Hey C. Bass! Watch this!
There are many variables that will determine
a "safe" compression ratio in a forced
induction engine. VERY generally, 8:1 should
be safe and still make adequate power. The best
bet is to consult with the manufacturer of the
blower you want to use.
Thanks,
Jay
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