Tom,
At 17:53 20/04/98 GMT, you wrote:
>
>Shane writes...
>
>>Yeah, dream on Roger. I notice in the latest Moss Cattledog
>>ads for aluminum (and cross-flow) MG, Big Healy and Sprite
>>heads. How come no-one has not done the same for Triumph
>>motors. Because all power is made in the heads, this is
>>the best "bang-for-buck" horsepower conversion you could make
>>to our old donks. So why has'nt this been done?
>
>'Cause the bottom end would grenade? Or the transmisson...or the
>rear...or the frame...or the...
>
Balls! I've been running 40-50% more horsepower than stock (for a UK model)
TR7 (ie. 140-150 vs. 105), for 2 years; if an engine has been rebuilt and
balanced (I also lightened the rods), the bottom end should take it. My
transmission and diff do not seem to have deteriorated either.
A friend of mine gets so much power out of his Dolly Sprint racecar, he's
broken 3 axles (until he went with a modified Rover part), but he's had no
catastrophic engine, transmission, or diff failures.
Okay, some models might be a little too close to their design limits, in
stock form (eg. 3-main bearing cranks, GT6 diffs, etc.), but I wouldn't
write them all off as being at their maximum compromise between tuning and
reliability.
Allen Nugent
Graduate School of Biomedical Engineering
University of New South Wales
Sydney 2052 Australia
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