Over Heating 604 Crate Question
Have new 604 w/ Willis Carb. Only thing different is running ethanol free 93 pump gas and new motor (has not been rebuilt). Carb was sent off to Willis in off season and we told them would be running 93 gas. Car is over heating.
Have timing at 32 Running 74 jets and appear a little fat. Went up 2 jet sizes still ran hot and seemed like we were buring raw fuel b/c got very hot under the seat. Went down 2 sizes and pipe is light gray but still running 220 or better.
Last year had problem getting car over 190.
Put in new radiator this week. Has 19" fan w/ shroud and KRC pulleys. We checked tension on the belt this week and it is good.
Put distilled water and 1 bottle of water weter and still ran 220 in a 6 lap heat and was climbing.
Main event was rained out but has been approacing 230 in main event
Questions.
Do we need to run different timing, plugs, jets etc on pump gas?
Any other suggestions appreciated.
I know Stewart has info on there site but we never had heating problem before.
Just looking for suggestions to see if I am overlooking something simple.
thx