Quote:
Originally Posted by Ms Grumpy
Just a quick question here. What is the "best/correct" temperature for a motor to run. The reason that I am asking is that I had an temperature problem on my way down to the Ohio show a few weeks back. In talking to many knowledgeable people I was told that it is not unusual for a motor to run 230, and in some instances it is almost better for the motor to run at a higher temperature.
So which is it ? Is a low temp (and what is that low temp) better for the motor, or is a higher temp (and how high really should it go) better for the motor.
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All 70 Chevelle engines except the 396 (402) came from the factory with a 195* thermostat. Don't know why but the 396 came with a 180* thermostat. It is a big debate, hotter engine burns fuel more efficiently and produces more power. Not an over heated engine but one that is fully warmed up including the oil. Cooler engine, less stress on the oil and parts. Dyno oil doesn't start to break down below 250*, syn oils can withstand even higher temps. Since oil temps can run 10-20 degrees higher than water temp you want engine temp below at least 230 to protect the oil. Of course you don't want to run at 230 all the time or even 225. But 200 even 210 at times is nothing to worry about.
If you have a 180* thermostat and run 200 or above your cooling system may be a little weak but you're not running in the danger zone. These 40 year old cars didn't have the air dams, etc like newer cars that keep engine temps more consistent. Most newer cars run a coolant temp in the 190-200 range. They seldom go above that because of the improved design of the cooling system and air flow.