Quote:
Originally Posted by shotgunslade
5. Jack Lavety's use of an electric water pump doesn't solve the problem. Given that it would have a different inlet configuration than the stock water pump suggests that the problem isn't cavitation.
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Agreed. But it did help a bit. He went from overheating 4-5 laps into a race to eventually (after changing the radiator, higher psi cap, electric pump, and surge tank) overheating 17-18 laps into a 22 lap race. So progress
was made, although the problem is far from solved. It probably doesn't help one bit that during the progression of cooling system changes he has continuously made power advances and rpm increases, which certainly makes isolating cause and effect difficult.
He has not run the latest configuration changes at the track, which includes the machining work at the front of the block (water pump inlet).
The best part seems to be that now the heat rises far more slowly, rather than instantaneously. And dropping the rpm shift points from 8200 to 6500 or so lets the engine cool off now, compared to before when a 6500 rpm peak was enough to boil over within 5 laps!
Anyway, I think that with all the information being thrown about here between Tony, Trevor, Harvey, Tom, etc....the cause and perhaps the solution is not too far away. I'm just sitting back and observing for now
.