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To swap or not to swap -

To: spitfires@autox.team.net
Subject: To swap or not to swap -
From: Barry Schwartz <bschwart@pacbell.net>
Date: Fri, 16 Nov 2001 10:53:40 -0800
Cc: triumphs@autox.team.net
Just my 2 cents - for what it's worth -
A word of caution when applying race car mods VS a larger engine swap for
increased HP.  In a nutshell. . .race cars only typically have to last the
race.  Sure you could probably get 170HP or more out of a GT6 engine.  Will
it last?   Probably not very long.  Would it be a decent street driven
engine tractable under a variety of driving conditions, definitely not.
You would probably be lucky to have it idle a 2000RPM and be a dog at
anything under 4000RPM  The same is true of the drive line - And it's
generally the large increase in torque that starts ripping things apart -
140 hp with 120 ft/lbs in a Spit or GT6 isn't too bad, and probably shorten
the life of the drive line components over stock.  Maybe a 1 or 2 year
rebuild cycle instead of 4 or 5 is acceptable to you.  150 hp with 180
ft/lbs will definitely shorten the life of the stock divine components
considerably  They might last a race, but certainly not be suitable for a
regularly street driven vehicle - The drive line has to match so that too
must be upgraded - As you can see, it gets very complicated very quickly.
Production components are selected upon a given load and duty cycle.  The
same part with a higher load, will have a shorter duty cycle - you don't
get something for nothing - Given enough load the duty cycle is nil, in
other words the part breaks.  Simply because somebody got such and such out
of a race environment, doesn't necessarily mean that it can be applied to a
street machine. . .they are two different animals - driven entirely
different.

Barry Schwartz (San Diego) bschwart@pacbell.net

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