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November 14, 2002
Guys-
I forget which site we were having a discussion last week on Judson
blowers,
so I am forwarding this message on octanes used in a high compression
948cc motor installed in a racing Bugeye
owned by Jacques LeClainche who belongs to the Spridget Autox.Team List.
This motor is most likely runnng between
13.0-14.0 to 1 as are a lot of racing Series "A"'s running "O-ringed"
today. What
makes the post interesting is that 30-32
degrees of total ignition advance (which
is the normal total for a stock 8.8-1
1275 using normally available premium
pump octanes) is still being utilized.....
but look at the octane required to
successfully run this amount of advance
without getting into pre-ignition/detonation
and the subsequent overheating develped
as a consequence.
One can now understand why octanes
are so important to would be Judson
user, considering 6psi boost will raise
your effective compression ratio 4-5
points, more or less.
Cap'n. Bob (Ret'd)
'60 Frog
PilotRob@... 16418
Posted on November 14, 2002 07:56 PM
Posted to category(s) Cylinder Head
| Engine (external)
| Engine (internal)
| Forced Induction
| Fuel System
| Ignition System
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