Thermostat Acting Strange - Team Camaro Tech
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post #1 of 6 (permalink) Old Jul 20th, 07, 05:39 PM Thread Starter
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Thermostat Acting Strange

My rebuilt 350 was running fine, normal temperature. The key accidentally was left on and the Pertronix and coil fried. I replaced them with the dual point setup and a Pertronix coil, 1.5 ohm.

When I finally got the dwell set and the car running again, the thing overheats while idling after about ten minutes. I took the 195 degree thermostat out and replaced it with a 180 degree new one. It still overheated so I tested the thermostat in some hot water and it opens properly, but when I put it back on the car, it does not open. There is pressure in the upper radiator hose, its it pretty hard. I believe the thermostat is not opening.

What could cause this?

BTW, it runs fine when you remove the thermostat. Does not get hot at all.

New 4 row radiator, new radiator cap, new hoses, new water pump.

Timing is set at 12 degrees and dwell is at about 33 degrees for the dual point distributor (Mallory).

68 Coupe, 350, M20 frame off restoration (a work in progress).
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post #2 of 6 (permalink) Old Jul 20th, 07, 06:16 PM
 
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Re: Thermostat Acting Strange

maybe an air bubble behind the stat...i always drill a 1/16 hole in the stat if it doesnt have a bleeder valve in it...but thats just me...
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post #3 of 6 (permalink) Old Jul 20th, 07, 06:57 PM
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Re: Thermostat Acting Strange

I assume you have the t-stat installed correctly.They are directional..as you may already know.Install a high flow stat with a bypass hole to burp air during refills and can contend with high flow waterpumps.Cheapo stats open into the flow and have a tendancy to want to close back up as a result.

George
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post #4 of 6 (permalink) Old Jul 22nd, 07, 04:52 PM Thread Starter
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Re: Thermostat Acting Strange

Thanks guys. I drilled a 1/16 inch hole in the flange of the thermostat and reinstalled it. Runs about 185 - 195 when idling.

68 Coupe, 350, M20 frame off restoration (a work in progress).
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post #5 of 6 (permalink) Old Jul 22nd, 07, 06:29 PM
DjD
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Re: Thermostat Acting Strange

If all you did was change the dist then the stat and adding a hole in it only masked the change. The idle temp is directly effected by initial timing, how fast it comes on and possibly vacuum advance being on a ported or manifold source...

...Dennis

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post #6 of 6 (permalink) Old Jul 23rd, 07, 01:13 PM
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Re: Thermostat Acting Strange

Quote:
Thanks guys. I drilled a 1/16 inch hole in the flange of the thermostat and reinstalled it.
I have been doing this for yrs...a suggestion made in one of Smokey Yuniks early books

My Spelling is not incorrect...it is creative

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