<VV> Overheating

[Larry Forman]

For something else:    Is the oil cooler winter/summer plate 
installed?   Make sure there are NO missing engine seals or heater holes 
open or heater hoses open.   If you recirculate engine heat to the 
engine it will overheat.   Are your thermostats opening properly and the 
doors not blocked?    Is the engine telling you that you are losing 
power or pinging?   If so - DEFINITELY it is overheating and stop and 
open rear engine cover and get it cooled down immediately.  What is your 
timing set at?   Has the harmonic damper outer ring slipped?   Check the 
alignment of the harmonic damper marks, inner to outer.   You don't have 
a variable speed pulley for the fan?

You say that the engine fins are clear and clean, but did you DEFLASH 
those fins to allow about 1/3 additional air through them?

Are you SURE that there is not some paper or cloth towel that got sucked 
into the fan and is blocking something?  Happens VERY fast!   You will 
need to remove the engine cover to double check.

Larry

On 4/1/2012 2:34 PM, J R Read wrote:
> They would normally run a bit cooler with headers which I assume means that
> you have no lower shrouds.
>
> What are you looking at - head temp?  I would not worry below 400F.  At 450
> I'd be keeping an eye on the needle.  If it goes over 475 I'd say you need
> to find the cause.
>
> Maybe your fan belt is too loose (fan slipping), bearing about to fail in
> fan - alternator - or idler pulley, oil cooler is blocked, wrong heat range
> plugs, something else?
>
> Later, JR
>
>
> ----- Original Message -----
> From: "Jay Botwick"<j.botwick at snet.net>
> To:<Virtualvairs at corvair.org>
> Sent: Sunday, April 01, 2012 4:19 PM
> Subject:<VV>  Overheating
>
>
>> I have a 65 Corsa Conv. 140hp. 4-Speed.
>> When on the highway or maintaining high revs around town it overheats.
>> If I keep the revs low I can drive around all day without a problem.
>> The only modification is I replaced the exhaust system with headers from
>> Clarks.
>> Checked the fan belt to make sure it isn't too tight.
>> Oil is fresh&  high zinc 10w30 for classic cars.
>> Run on 93 Octane Unleaded.
>> Engine fins are clear and clean.
>> Filters are fresh.
>> What is the normal temperature range when warmed up?
>> Any troubleshooting suggestions?
>> Thanks!
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