454 Running Hot
So I just got back from my 2nd trip in my '84 Allegro. First trip was 300-miles RT in high-80 degree weather. Engine temps fluctuated but didn't enter the red zone until the last couple of mile from m...
Forum Discussion
First thing to check is radiator and air conditioner,and clean out with low pressure pressure washer and soap while warm.
Second you may have a thermostat stuck part way closed. Install a new normal open, when hot, then flush cooling system and check for collapsing hoses and fresh antifreeze. Look around the head surface engine block joint and wipe with cloth and see if there is antifreeze. Check engine oil for level and smell and color and foam of oil or oil like substance floating when you take the cap off, cold. Check the plugs for one or two for signs of antifreeze or oil. Run a compression test and watch for bubble in top of the radiator.
Engine noise possibly? Did you use 93 octane or 87 octane. High loads, even in low octane spec engines can raise temp and even detonate. 93 octane may be required. I'm betting on clogged fins and possible stuck thermostat or clutch fan not operating soon enough.
Let us know please
Second you may have a thermostat stuck part way closed. Install a new normal open, when hot, then flush cooling system and check for collapsing hoses and fresh antifreeze. Look around the head surface engine block joint and wipe with cloth and see if there is antifreeze. Check engine oil for level and smell and color and foam of oil or oil like substance floating when you take the cap off, cold. Check the plugs for one or two for signs of antifreeze or oil. Run a compression test and watch for bubble in top of the radiator.
Engine noise possibly? Did you use 93 octane or 87 octane. High loads, even in low octane spec engines can raise temp and even detonate. 93 octane may be required. I'm betting on clogged fins and possible stuck thermostat or clutch fan not operating soon enough.
Let us know please
