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Howard Jones · 07-21-08, 05:00 PM

Str 8, I'd like to hear more about cooling at high revs. My car seams to cool well when driven at low to med power levels even in hot weather (95F). But when reved to 6K and at near full power for several laps (20-30 mins) it will climb to aprox. 220-240F in 90-100F air temps. Car cools right down on cool down lap to aprox 180ish F. Is this a problem?

Could this be I'm turning the water pump to fast? Slow? I am sure it is not air in system because I have blead lines from the rear of the intake (both sides) as well as both tanks of the radiator (top) back to the expansion tank. What would you recomend for a reduction ratio between the waterpump pully and the crank pulley?

Could I be making air in the system with pump cavitation and then pulling it back out when revs go down?

I have a eldenbrock victor junior alum pump and alum heads and aprox 300hp at the wheels. The engine oil is cooled and holds 8 quarts. Oil temp never goes over water temp at top of heat range and is usually about 200F.

Any other ideas?

07-21-08, 05:00 PM	#11 (permalink)
Howard Jones 10 tenths Join Date: Jun 2002 GT40: San Francisco Bay Area California USA Posts: 1,920 Rep Power: 26	Re: LS7 engine problem Str 8, I'd like to hear more about cooling at high revs. My car seams to cool well when driven at low to med power levels even in hot weather (95F). But when reved to 6K and at near full power for several laps (20-30 mins) it will climb to aprox. 220-240F in 90-100F air temps. Car cools right down on cool down lap to aprox 180ish F. Is this a problem? Could this be I'm turning the water pump to fast? Slow? I am sure it is not air in system because I have blead lines from the rear of the intake (both sides) as well as both tanks of the radiator (top) back to the expansion tank. What would you recomend for a reduction ratio between the waterpump pully and the crank pulley? Could I be making air in the system with pump cavitation and then pulling it back out when revs go down? I have a eldenbrock victor junior alum pump and alum heads and aprox 300hp at the wheels. The engine oil is cooled and holds 8 quarts. Oil temp never goes over water temp at top of heat range and is usually about 200F. Any other ideas?