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Old 01-08-2004, 02:13 PM
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350 chevy overheating & pinging

My 350 engine from a 68 camaro that is in a Mazda b2200 converted to a hotrod is majorly overheating to temps around 240-260 degrees what can be done other than taking out the thermostat?? also it pings when i start it and then i have to give it a shot of gas to calm it down and then it stops pinging. i already reduced the timing and it still happens, don't know why...
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Old 01-08-2004, 02:19 PM
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Is your thermostat sticking closed? Is your top rad hose gettin superhot while your bottom hose is still cold? An engine with a working waterpump and unclogged radiator will have enough waterflow to keep it from everheating. The thermostat is there to help bring UP the temp of the engine so I'd say you have a sticking thermo, clogged rad, bad water pump. Start with the cheapest. Waterpumps go out more rarely than a lot of people think.

So yeah before taking out your thermo check your hoses for varience in temperature.

Hope this helps some.
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Old 01-08-2004, 02:23 PM
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the rad is extremely hot, and the hoses are also and i already took the thermo out and it help i think but it's still hotter than it should be i've been trying new things but i haven't tryed checking the bottom hose to see if it's cold...

thanks for the tip.
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Old 01-08-2004, 02:29 PM
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If you therm. is out and your still overheating then it seems you might have a water flow problem. Do you have water leaking out your heads at all? Sometimes bad headgaskets can contribute to to overheating but thats not super common.

Waterpumps are fairly cheap if thats the case. You can have the rad pressure tested but I would go with a waterpump if it hasn't been replaced for awhile. I'd say the fan spacing or whatnot could contribute but if there is not thermo then the water flow by itself should be enough to keep your engine cooler than it should be. For the most part engines like to run fairly hot . . . its the cold air they like and a lot of people get that mixed up and end up running their cars too cold.

Pinging is often caused by something being too lean or not a high enough octane. Try a shot of octane booster and see if that helps any. If not check your mixture of air/fuel and try adjusting that.
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Old 01-08-2004, 02:33 PM
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Wink high temp

you say your engine s running hot,you could have slug inside your block around your cylinders so you may need an engine flush.your water pump comes off, thermo housing off, then back flush cooling system,you willbe surprised how much slug maybe in there.then put a new pump on your motor,recore you radiator,after all of this you should be running cool.bye.
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Old 01-09-2004, 08:54 AM
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You will run hotter without the thermostat than you will with a thermostat.

You have to have a fan shroud, the fan should be mostly in the shroud. If it's a clutch fan, get a new clutch.

If it's pinging, it has some carbon build up or is to fast on timing.
Also could have to much compression.

Double check the temp sender unit they do go bad and they have to be compatible with the gauge. HTH

Good Luck
Troy

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Old 01-09-2004, 10:10 AM
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Doody doo...I'm an idiot too!

Last edited by 4 Jaw Chuck; 01-09-2004 at 10:16 AM.
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