Maurice,
FWIW, the Porsche 944 is a 4-cylinder engine which at 2.5 liters is just about
max. due to the balance problem. A 4-cyl. in-line engine always has a pretty
strong balance problem (rocking couple or something like that) above (approx.)
3500 RPM. The balance shaft used on the Porsche, Mitsubishi, and others
reduces the imbalance considerably. A 6-cylinder in-line engine on the other
hand is a naturally balanced design, and from what I understand has better
all-around balance than any 4 cylinder, V6, or V8. About the only smoother
design is a V12 (two in-line sixes on a common crank) or probably Bugatti's new
W18 (3 inline sixes on a common crank). Anyway, what I'm trying to say is that
as long as you make sure all parts are correctly balanced before assembly of a
2.7 liter inline six, it should be a sweet and smooth running engine. Just my
.02.
Gordon Buck
Sultan, WA
71 TR6
67 MGB GT
-----Original Message-----
From: Maurice Dykes [SMTP:mhdykes@thinkage.on.ca]
Sent: Friday, November 20, 1998 8:58 AM
To: Scott Decker; Triumphs List
Subject: Re: 2.0 to 2.5 to 2.7 liter
At 10:11 AM 11/20/98 , Scott Decker wrote:
>six to 2.7 liters. Operating on the theory of 'more displacement=more
>grunt' and throwing originality out the window (sorry), is it insane
to
>think about putting a 2.7 liter in the GT6?
>If not, then would I be better served by boring/stroking the existing
2.0
>or just buying a TR6 block?
The TR6 and GT6 have the same bore so that is not a factor, but
different crankshafts. You will have to look at how the 2.7 is
achieved; bore or stroke changes and which crankshaft does the donor
engine require.
I wonder if this is potentially a rough running engine? My 2.5L Porsche
944 has a counter rotating balance shaft to overcome vibration. The 2.7
certainly will not be red lining at 6800RPM :-)
-Maurice
GT6 2.5 and loving it!
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