Hey Alpines,
Any one out there using chevy rods in an alpine motor?
There is of course a write up on the chevy rods, but is any one actually
doing this>
I am in the process of building a (full-race) motor for my Alpine,
and I thought I would share some of my findings to some of you
gear heads out there.
For those of you not too interested in hipo engine mods, read no
further.
First of all, I will be using chevy con rods.
Specifically, I have a set of Carrillo forged rods from a formula 5000
engine.
These rods are 6.0 inches, which is .375 longer than stock.
Also the rods have 7/16 doweled cap screws.
Over all, the rods and cap screws wiegh the same as the OEM rods.
The rods are so big on the big ends that the piston pins must be
installed
from the bottom side of the motor (This has been checked to be
possible).
The pistons will be forged alluminum, and of course is set around the
length of the con rods.
The pistons are much shorter than stock, and will weigh about 2/3s that
of OEM pistons.
The piston pins will be standard SB chevy.
The crank will be a standard 1725 crank that is ground down to the 2.000
inch
journal size for the SB rod bearings.
Also, I believe I will end up stroking the crank to get even more
displacement.
The head will be ported, and the before, during and after flow data
will be
published, and made available to you all, so that we may all know what
porting methods are most beneficial/practical.
The compression ratio will be about 11/1, and the head bolts will be
replaced
with ARP studs to allow for a higher head torque spec, and reduce bouts
with
headus gasketus blowiticus.
The whole rotaing mass will be balanced as a unit.
Based on the mechanicals going into the engine, it would appear that
there will
no longer be a real red-line on the motor, as the head will stop flowing
long before the bottom end wants to fail.
It appears possible to make a 160BHP engine using the above
configuration
and a good road race camshaft.
Here are some figures for you all to ponder.
Bore Stroke Displacement
STD 3.210 3.250 1724cc
BORE1 3.247 3.250 1764cc
STROKE1 3.247 3.300 1791cc
STROKE2 3.247 3.350 1818cc
BIGBORE 3.390 3.250 1922cc
BIGBORE+STRK 3.390 3.350 1982cc
The big bore info is based upon 86.1 mm pistons and sleaves being used
in your engine per SAOC newsletter.
Anyone out there have some cool mods for these motors, or
perhaps better ways of doing it?
Jarrid Gross
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