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Author Topic:   Trying to cool running on gas.
posted September 09, 2002 07:02 PM
Actually running in a LLM class. But I know alot of B-mods have to run on gas also. How do you keep engines cool running the smaller radiators? I heard that there were some gas additives that may help. We are running 377 and 406 engines. Any suggestions?

posted September 09, 2002 07:57 PM
first you need to have a good 2 row aluminum radiator, not the lightweight single row. build a good tight fitting shroud that fits well around radiator and fits around fan. make the part around the fan about 1 to 1 1/2inches bigger than the diameter of the fan and space the fan where it is half in and half out of the shroud. in front of the radiator you will need a good screen to keep mud out of it and if your nose extends very low to the ground you might have to cut some holes in it for extra cooling but i would run it first before i cut the holes bcause you may not need them. also weekly maintenance of radiator will be required to cleen the fins out.

posted September 09, 2002 08:43 PM
evans cooling offers a waterless coolant that is advertised to run cooler. you can't have any water in the system though. an engine oil cooler will also help and is an area usually overlooked by most grass roots racers. also, most aftermarket aluminum radiators aren't very efficient. two 1" cores don't cool as well as four 1/2" cores. also, look for a radiator with more fins per inch. more surface area makes the radiator more efficient. it's not necessarily how much water it holds, it's how much surface area it has.

posted September 09, 2002 09:31 PM
I run a a Ford in my modified, and its on gas. I have no problems with my car overheating, I run no thermostat and no restrictor. The key to ours runnin cool is we have a Stewart water pump, that keeps the car runnin 160 to 190 on 100 degree nights out here in Wyoming!

George Gilliland
posted September 10, 2002 11:09 AM
When I first ran a modified I ran on gas. Two core aluminum radiator, 160 deg. thermostat, and the pulleys ran the water pump slightly faster than the engine. I had to wash the radiator every week. The temperature never went higher than 210. I have a good shroud and it would cool down a little on yellows. With the limited space for a radiator there is not a lot of safety margine there.

posted September 10, 2002 08:11 PM
Poboy, I have ran gas for 3 years in a mod with no shroud and no openings in the nose. Stewart water pump, the good reduction pulleys, the good green stripe water hoses, 2 bottles of Red Line water wetter, and 3/4" restricter. I have ran 350's, 383's and 406's ranging from 380 to 500 HP, with absolutley no problem. I believe the key is to NOT get to radical with the timing and use the good water pump and hoses and also use the old 4 blade Ford fan. I have never had an engine go over 200 deg. I also use a 27" 2 core AFCO radiator. All of these pieces are 3 years old. I take a lot of time to keep the radiator straight and clean. Again I do not run a shroud. Its not that I don't believe in a shroud, I just have not needed one. On cool nights, it is hard to get the motor up to temp, so I advance the timing from 35 to 37 deg. That is usually good for about 10 deg in temp. Good Luck.

posted September 17, 2002 06:02 PM