-------- Original Message --------
Subject: Re: Port Matching
Date: Sun, 08 Jun 2003 07:53:22 -0400
From: Don Malling <dmallin@attglobal.net>
To: john donnelly <pdonnel1@san.rr.com>
CC: "Triumphs List (E-mail)" <triumphs@autox.team.net>
References: <000101c32d78$acd93f70$0200a8c0@toshibauser>
FWIW, I believe in David Vizard's book on the "A" series engine, he
recommends that the exhaust header be larger than the head's exhaust
port. It has something to do with reducing back pressure. He recommends
that the head's intake ports me matched with the intake manifold.
Don Malling
john donnelly wrote:
> I was looking through David Vizard's Tuning Standard Triumphs and found a
> section that discussed matching the port openings between the head
and the
> intake/exhaust manifolds. So I checked mine and found two of the exhaust
> ports were offset by about 3/16 inch. Since the exhaust manifold openings
> are bigger than head openings I didn't think it'd be worth the extra
effort
> since no restrictions exist.
>
> Has anybody did port matching? Was it a noticeable improvement?
>
> Thanks!
> John in San Diego
> '67 TR4A IRS
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