Quote:
Originally Posted by Ronnieroadster
Since the temp went to 180 just sitting in the driveway with the outside temp at 86 that's not good. The temp difference you discovered from top to bottom using the heat gun is showing there's an issue with the radiator design. The air flow across the tubes/fins on the highway should be dropping the temp more than what your seeing. I would expect a reading of 180 on the highway however since its already at that point just idling in the driveway there's no way what your working with is going to get better.
Understanding how the flathead exhaust ports are super heating the water in the block a difference of only 15 degrees is not good.
What I would do if you haven't already is set the initial ignition timing at 12 degrees with a total all in of no more than 25 degrees. Personally I have never used a boost retard I see no reason for it unless the boost your getting is going above 10. If you do not see any reduction in the driveway temp after doing this in my opinion there's not much your going to do with the radiator you have.
Ronnieroadster
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So Ronnie, on your blown engines do run 25 d at full boost?? Mine runs 5lbs of boost but as stated my boost retard scales it back anywhere from 1 to 3 d per pound of boost. I usually set it for 2 d so that brings my total advance back to 16 total advance. I have not tried setting it back to say 1 d per lb. This is what Mark Kirby (RIP) suggested when this engine was built in the 90's. I will give it a try at 1 deg.. There is 30,000 miles on this engine and it has been quite reliable so far putting out excellent power.