Hi Neil
I haven't seen a response to your query re an upgraded heat shield.
My car (early 6 cylinder) has the integral inlet manifold and features a rather
small metal heat shield. This originally had some heat resistant material on
the engine block (probably asbestos based) which peels off in time.
Running with the metal shield only resulted in fuel being expelled from the
carbs (H4) at rest. I covered the shield with the high tech heat resisting
material used by racers, hot rodders, etc, and this cured the problem. I
deliberately cut the material oversize to more fully cover the exhaust
manifolds.
Please let us know how you get on!
Regards
Paul
PS I have also had problems with (new) coils and suppressor spark plug covers
when hot.
Date: Thu, 08 Jul 2004 17:47:35 -0700
From: Neil McDonald <nimcdonald@shaw.ca>
Subject: Re: Hot Problem
Bill's comments are very interesting. I have tried various temperature
lowering suggestions (checked radiator is OK, installed correct sleeved
thermostat, added multi-bladed fan, added electric fan in front of rad,
checked rad ducting) all without much success in preventing overheating
problems - specifically mis-firing when the water temperatures reach around
175 degrees F. Not that high!
The other day, after it got even hotter, I swear she was only running on two
cylinders for a while! It sure ruins the fun when this happens.
The possibility that radiated heat from the exhaust manifold is causing
vapour lock in the carbs is a new thought for me. I am tempted to rig up a
remote water spray for the carbs, that can be actuated by the driver whilst
still on the road, to test out this theory!
Has anyone tried upgrading the carb heat shielding to address the issue?
Neil
...........................................................
Neil McDonald
BN6
North Vancouver BC
Canada
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