I agree, 175 is not "hot" for a Healey. Must be a different problem.
They say 95% of all carburetor problems are in the ignition. The coil
and condenser are very prone to temperature related failures.
Bill Lawrence
On Jul 8, 2004, at 6:27 PM, davidwjones wrote:
> Neil,
> Your operating temperature sounds normal. The misfiring sounds like it
> is an
> ignition problem, not excessive heat. I would check components that
> would
> tend to break down under load, after a period of time, or when hot.
> I'd try
> the coil, condenser, and plug wires first. My tricarb runs 160 to 190
> degrees depending on ambient and driving conditions and I do not have
> vapor
> lock problems. This, and it is all stock-standard.
>
>
> ----- Original Message -----
> From: "Neil McDonald" <nimcdonald@shaw.ca>
> To: "Bill Lawrence" <ynotink@qwest.net>; "Healey List"
> <healeys@autox.team.net>
> Sent: Thursday, July 08, 2004 8:47 PM
> 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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