msecres@ibm.net wrote:
>
> Some idle questions.
>
> 1) A GT6-3 weighs 1,936 lbs. What's a TR6 weigh?
Ummm, about 2300-2400, maybe.
> 2) It's my understanding that a GT6 Mark 3 engine can easily be stroked
> to 2.5 liters by installing a TR6 crankshaft and pistons, and modifying
> the oil pan so that pistons 1 & 2 clear it on the downstroke. Anyone
> done this for themselves?
NickBk has, I believe. I bought my Mk III with a TR6 engine in it.
Despite someone here mentioning that the rods are different, the early
TR6 rods are the same size and casting number as those in the GT6. About
block clearance, I'm not sure--don't know if a little grinding here and
there is necessary for rod clearance. There's also a problem with carb
clearance--the stock 175s are taller and bang on the bonnet. That means
finding a late head and putting a GT6 manifold and 150s on it, or
putting on a mid-late GT6 head and manifold.
> 3) Can you do it with the engine in the car?
You might be able to do it in the car, but why? If one's a natural
masochist, it might be fun. For the rest of us, it's a pain in the butt
to get the crank out in the car, and if there were any clearancing
required internally, you'd go nuts trying to do it, test fit the crank,
take it out, check again, etc. I definitely wouldn't attempt to remove
the pan, beat clearance dimples in it, fit it again and find out the
rods still hit it. By the way, this little trick is absolutely necessary
to put the longer stroke engine in a GT6. The stock TR6 pan rests very
nicely on the rack tube, and they wear together, along with creating
_lots_ of vibration.
> 4) Can someone please get me a new skull? Mine's got too many gears in
> it lately.
There's a couple of other considerations, as well--the extra torque of
the larger engine is particularly hard on the gearbox and third member.
Gotta find a way to beef those up, or you'll have more gears in your
head than your gearbox, after a while.
Cheers.
--
My other Triumph runs, but....
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