<VV> Hot

[Paul Fox]

 In my 42 years of experience with Corvairs I have never seen a temp light come on. I don't know what temp it will come on but I have lost many fan belts over the years and it never came on multiple engines.  It sometimes did serious damage to the engine. But you are correct it will detonate badly when it's to hot and will smoke from under the top shroud when you shut it down. Another possibility is the wiring to the switches is touching ground somewhere So check that. Then put a head temp gauge on it and know for sure. I've also seen replacement thermostat's fail in the closed position and stay that way. That destroyed the engine too. Change the oil if in doubt it's cheap insurance.Paul
    On ‎Tuesday‎, ‎July‎ ‎17‎, ‎2018‎ ‎11‎:‎33‎:‎33‎ ‎PM‎ ‎EDT, FrankDuVal via VirtualVairs <virtualvairs at corvair.org> wrote:  
 
 Yes, to the below, and , did you hear any pinging? Usually that is the 
first sign of overheating with the higher compression engines (102, 110, 
140, 150, etc).

Back in the day with Dino oil we didn't change the oil at the first 
overheat lamp.....:-D

Frank DuVal


On 7/17/2018 4:25 PM, Jim Simpson via VirtualVairs wrote:
> I don't see any particular reason to change the oil.  Synthetics like Mobil
> 1 are good to pretty high temps --  according to their web site, the Mobil
> 1 oils can go to 500 F!  I suspect that's a "flash temp", not sustained
> driving, but unless you melted a bearing or something, I doubt you've hurt
> the oil.
>
> The bigger issue is why did you get a overtemp warning light?  Even at 108
> outside temp, the engine shouldn't overheat at any reasonable highway
> speed.  Chevrolet tested the engines during development at higher temps and
> speeds than that.
>
> So check the cylinder head flashing, the fan belt, oil cooler to be sure
> there's nothing blocking air flow.  And don't overlook the cylinder head
> temp switch.  They've been known to go bad and trigger at lower than
> specified temperatures.  (Do you have a cylinder head and/or oil temp
> gauge?)
>
> Jim Simpson
> Group Corvair

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