Folks:
Check out "The Theory and Practice of Cylinder Head
Modification" by Vizard. He claims in the section on the
2.5l 6-pot that past about 130HP (if memory serves) you
will need to upgrade the carbs, as they begin to be a
restriction.
Not to say you can't get more than 130HP from
twin ZS carbs, but beyond 130HP you begin to enter the
region where upgrading the carbs will give more power.
The inference from this (for me at least) is that
there is no power to be gained on a stock motor if you
upgrade the carbs. The "wow" factor is another story however....
Cheers,
Vance
------------------------------
1974 Mimosa Yellow Triumph TR6
Cogito Ergo Zoom
(I think, therefore I go fast)
-----Original Message-----
From: Timothy Holbrook [mailto:tjh173@yahoo.com]
Sent: Sunday, January 19, 2003 12:16 PM
To: 6pack@autox.team.net
Subject: Re: Triple Carbs Verdict
I don't think anyone knows for sure, because no one has ever done dyno
tests back-to-back of identically prepared engines with 2 carbs vs. 3.
That would be a really interesting test...
I think we can all agree that you should spend your money on modifying
the engine a bit first (port/polish head, increase compression, add
performance cam, header, roller rockers, etc) before adding the third
carb. The late-style stock intake manifold is pretty long and offer a
relatively straight shot to the head, and I bet it flows pretty well.
I'm sure you can get over 150hp out of the TR6 engine with stock dual
carbs, while still remaining reliable and streetable. There are some
guys on this list with stock dual carbs, but with other mods, who are
running mid 15s on the 1/4 mile...
Tim Holbrook
1971 TR6
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