greetings,
Again, It is my experience that the replacement of the
iron head with the alloy head will yeild Much more streetability to a road
machine..and..I wonder why all racing machines use them..That about sums up All
of the uses i can think of.
Howard
The Blues is the only music Original to the United States of America.
--- On Mon, 6/16/08, drmayf <drmayf@mayfco.com> wrote:
From: drmayf <drmayf@mayfco.com>
Subject: [Tigers] Alloy Heads...
To: "tigers@autox.team.net" <tigers@autox.team.net>
Date: Monday, June 16, 2008, 9:45 AM
With regards to alloyheads for our cars, I asked a good friend, way up
in Mystic, Conn, what he thought about them. No his credentials are
pretty good as you can see in the edited reply he sen tto me....is it
of any importance? I dunno..
here is his reply to my question about the use of alloy heads on daily
driver moderately hopped up motors.
"Been working seemingly day and night LOL success is vastly over
rated..LOL..
The alloy heads are a tough call and it depends on the final goals.
The interesting thing is a good flowing head will allow the use of a
camshaft with less duration and overlap all good for mileage and
drivability..
Being alloy they seem less efficient thermally so not good for mileage
yet all engines are using alloy heads so probably less important than it
seems.
Iron heads are more prone to cracking or failure under changes in
temperature. We used to crack them on shut down in the Winston Cup days.
Removing weight is always a plus for mileage and if it is high off the
ground good to remove it for handling issues, though I doubt if 20 lbs
makes much of a difference on a passenger car going legal speed limits.
Using the track as a dyno is a very bad idea as it is subjective rather
than objective. You are a science guy and am sure well aware of all that
is involved in proper testing and removing opinion from the results.
.
I am in the middle of doing 2 motorcycles for Bonneville, 2 Nissan GTP
cars and a Riley Scott ford WSC car.. a Formula Holden, a Cosworth DFV
for a formula 3000 car and a bunch of of other nagging small projects..
So more than a little busy and the reason for being a little scarce..
Dave"
Dave owns and runs an Engine Management Service company for high end
race mosheens. He builds and tunes these cars and bkes as well as doing
a lot of hand made intake manifold systems for race cars. When iwant an
opinion on someting I am doing he alwasy has an opinion, lol. He is a
good guy for me..
mayf
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