Frank;
-Even with the steel forged rods & crank I personally wouldn't turn a
289 past 7K. Don't remember the exact specs of the "K" motors right
now.Personally, I feel consistent excursions past that RPM without
4-bolt mains on the center caps is risky.
I worked quite a few years as an automotive machinist at an engine
rebuilders & had plenty of samples of over-stretched rods and busted
cranks on our "wall of shame". Any engine that's "over-square" (like
the 289 with it's stock 4.00" bore & 2.87" stroke) has some inherent
defects from a strictly-Physics standpoint to overcome.Can't remember
it in detail now,but I fuzzily recall it had to do with stroke, piston
& rod weight, crank strength, acceleration and de-acceleration of the
whole assembly etc., vs. any given HP & torque output you get at a
specific RPM.
Not necessarily better, but the small-block Chevy has good offerings
with stroke measurements coming even to the bore. AKA the 4-bolt 350's
that came with the steel rods & cranks and the 2.02" "double-bump"
heads were put into plenty of family wagons. One of these with a
better set of rod bolts, shot-peened, balanced, hi-po cam, etc. can be
put together for not much extra cash, including the screw-in studs &
guide-plates for the heads. Then just add a good quality rebuild &
valve job, & voila!!
Hey, don't get me wrong, I LOVE our TIGER and the 289.
Phil
______________________________ Reply Separator _________________________________
Subject: RE: Re[2]: New Thread (was REALLY, REALLY SMALL...)
Author: marrone@wco.com (Frank Marrone) at ~INTERNET
Date: 6/26/96 9:32 AM
>the Alpine would pass it by in top speed due to the Higher Revs of the
>215 at 9,500 max RPM (Built for racing using the boat racers specs.
>They turn them 9,000 all season long and 9,500 during the finals at each
>event.!!!).
Well, the 289 can easily be built to withstand plenty of 7000 RPM excursions
and for a bit of extra coin (but not that much) you could come close to the
9000RPM you're claiming for the 215.
Frank Marrone MK I Tiger B9471116
marrone@wco.com 1966 LTD
Series I Alpine (2.3L powered by Ford)
Yamaha Seca 900
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