I believe I have a copy of the article in hand (from the 1992 edition of
the TriumphTune book, originally published in Sports Car Monthly), but
it actually says very little about the conversion, instead recommending
to just fit a complete 2.5L engine.
To paraphrase : if you have a late Mark 3 GT6, you can keep the block,
and change only the crankshaft, pistons, and head from a "post-1972"
2.5L engine with the shorter rear crankshaft nose. The GT6 sump will
have to be reshaped for clearance for #1 and #2 rods.
That's all it says. They don't quote any power figures, but imply that
the conversion is very worthwhile. (Old hot rodder's adage : "There
ain't no substitute for cubic inches")
If everything else stays the same, you should get a 25% increase in
power pretty much throughout the range, with no weight penalty, a
sizeable gain.
Randall
"Hill, Stephen M EDUC:EX" wrote:
>
> The Moss Motors UK Triumph Tuning Guide (or whatever it is called) has an
> article in the back section which talks about what you need to convert a 2.0
> to a 2.5 litre.
>
> Stephen
>
> > ----------
> > From: HARRIS, ALAN J[SMTP:AHARRIS@entergy.com]
> > Reply To: HARRIS, ALAN J
> > Sent: Friday, May 26, 2000 10:21 AM
> > To: 'triumphs@autox.team.net'
> > Subject: converting 2.0 to 2.5 liter engine
> >
> >
> >
> > > I was having my crankshaft turned for my '69 TR6, and low and behold, a
> > > previous owner has swapped engines to a 2.0 ltr, presumably from a GT6
> > > (?). According to the guy at the machine shop, the blocks are
> > essentially
> > > the same, as are the piston diameters. What's it take besides replacing
> > > the crankshaft to convert to a 2.5 ltr? Is the additional hp worth it?
> > >
> > > Alan Harris
> > > '69 TR6 (mostly)
> >
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