<VV> Hot

[James Davis]

There is no record of Chevy testing the 140 engine for temperature.  The
140 heads have 27% less fin area then the other heads due to the larger
intake and exhaust ports.  It stands to reason than they would run
hotter.then the average engine but I suppect they would not overheat in
normal operation.
Jim Davis

On Tue, Jul 17, 2018 at 3:25 PM, Jim Simpson via VirtualVairs <
virtualvairs at corvair.org> 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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