<VV> Overheating

[HallGrenn at aol.com]

.............and are all of your sparkplug boots fully seated?  With  as 
few as two off the engine cooling air won't get where it is supposed  to.
 
Bob
 
 
In a message dated 4/1/2012 5:47:57 P.M. Eastern Daylight Time,  
larry at forman.net writes:

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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