I had yet another water pump housing crack. Luckily I found one and got it replaced before the race this past weekend. I put the belt on and made sure it was pretty loose. After a 15 minute practice session, I came in and checked the housing and belt tension. The belt was substantially tighter, I assume its from metal expanding under the hot conditions. I also assume that the past 2 housings cracked when the belt tension increased due to high temprature expansion and harmonics.

I loosened belt tension a little more and it held for the whole day.

My water temp is very high...250 when running water with water wetter. It's a brand new oversized radiator, and I removed the thermostat...No fan (will an electric fan provide better cooling than air at race speed?) It cools down quickly when I back off during cool down... Any ideas on how to get it lower? Is this operating temp normnal?

Thanks,

Steve "two more races 'till I shed my X" Smyczek