>All we know is we don’t want

> the coolant to boil in there, and we know that there are potential hot

> spots, particularly around the plugs that can be the limiting factor.  We

> also know that heat load is much higher on the plug side of the engine than

> on the other, which can lead to some thermal expansion issues if the

> temperature drop across the engine gets too high; how high is to high, I

> don’t know.

>

 

The point that concerns me the most and the question that will only be

answered with experience is how much will the higher delta T effect the

long term reliability.

 

Yes; we don’t know the implications of higher delta T on the engine, but we can say with confidence that more flow is better (safer) from the standpoint of delta T and temperature distribution.  For continuous high power levels this is a consideration.

 

The other point is the since the rad inlet is limited to ~210F, we know that the larger the temperature drop, the lower the average radiator temp (goes down by half the increase in the delta T), and the larger the radiator core needed to dissipate the heat; a weight and space factor.  For an inlet air temp of 80F, a coolant temp drop of 50 degrees needs about 15% more core than a 20 degree drop.  Not a big deal; but something to consider.

 

I'm afraid I'm doing more trial and error although I'm trying to

copycat successful systems as much as possible.

 

That’s called “research”.

 

Best of luck with your system.

 

Al