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Quote:
Originally Posted by Ziggster
If the cap is working properly and is rated correctly, it will open at 223F (50/50 mix) plus 3F for each psi. So for 7.5 psi, that is 22.5F above 223F, for a total of 245.5F. So, if you have coolant flowing into your overflow container it is either going beyond that temp, or there is too much "coolant" in the system. Also, when I look at the location of the cap vs the top of the upper rad tank, it looks lower. This would suggest to me that you have air in the system, and we all know what happens to a gas when heated vs a liquid. Could you have air trapped in the system that is artificially causing the coolant pressure to be higher than expected resulting in the cap opening? Also, the coolant overflow reservoir must have the overflow port connected to a tube that permits the coolant to be drawn back into the system when cooling down. To work properly, the bottom of that tube must always be submerged otherwise air will be drawn back into the system.
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I think you're on to something with the filler neck being lower than the top of the tank introducing too much air and hence frothing into the coolant at higher rpms. Thanks for that idea/thought!
The coolant recovery tank insides are constructed correctly, but I was starting with zero fluid in the tank thinking any overfill of the rad would land in the recovery tank and would self regulate to the level it wanted/needed.
I was talking with an old time hot rodder/friend who said back in the day, they would drill the waterpump impellers to make them less efficient at higher rpms. Anyone ever hear of that? Any details?