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Author Topic:   keeping a gas motor cool ?
posted February 07, 2004 05:31 PM
How about a BG 850 Alky Carb, Fuel log, BG throttle bypass and Alky mech pump for $500? That will keep it cool.

posted February 07, 2004 09:40 PM
The biggest key is a SHROUD. 4 blade gm fan is good. The fan should split center of lip on shroud to avoid creating wall effect. I've run gas for 14 years and had to put water on motor 1 time[100 degree night]. I also run a oil cooler. Ran alcohol 1 year but didn't like the way it changed car so much. Also I run a 7/8 inch restricter, no thermostat.
The big one hear and it sounds totally nuts but get your water from lake,pond,creek, NOT tap water. Lake water will run 5 degrees cooler. Don't know why but it does.

[This message has been edited by KMUDD (edited February 08, 2004).]

[This message has been edited by KMUDD (edited February 08, 2004).]

posted February 08, 2004 09:55 AM
I agree Zero. My motor builder swears gas makes more HP too. I just hate having to race AND watch the temp gauge at the same time.

And now a real answer for cooling on gas...

* 350 400's
* 5 blade STEEL fan.
* Very well build, mostly air tight fan shroud
* The fan depth must be half way to the edge of the shroud
* The biggest alum. radiator you can fit
* Anti-freeze (illegal at most tracks but do it anyway)
* A good waterpump (new)
* External Oil Cooler
* Good hoses that wont colaps (sp)
* Lower compression in your motor. Dont try and run a alky motor on gas. A flat top 11 or 12 to one is perfect.

Good luck!!!

posted February 08, 2004 01:49 PM
A dual pass radiator really helps. About $40 more expensive but it should help a bunch. AFCO has them.

Good luck,

posted February 08, 2004 06:11 PM
Try putting foam rubber between radiator and side of car, it helped us on one car we had.And make sure the radiator can breathe,run water through the fins.

posted February 09, 2004 07:49 AM
Well there ya go. This board is great for mix opinions.

I MY OPINION...mind you, just another guy, the anti-freeze is a good thing. Once a motor gets to 220, it climbs fast. As soon as the water boils, it is gone and wont return. Anti-freeze is cheap...helps prevent boil over...and stops corrossion (sp). Don't use too much. A gallon always worked great for me.

Good luck.

Ego Racing
posted February 09, 2004 07:46 PM
Antifreeze is illegal at most tracks period.
22 lb cap raises the boiling point above most anti temp levels, clean the systen with water from the hose, keep running it through until the watter comming out is clear as the water going in. Get a corrosion inhibitor for the radiator (Brass or Aluminum) and fill the cooling system with distilled water from the store. The boiling point of the distilled water is about 10-15 degrees higher than tap water. Put a small valve in the system at the highest piont, connect an overflow bottle on the rad cap neck and put distilled water in it. Run the engine and bleed ALL of the air out of the system, when it cools if will draw water out of the overflow if it needs it. This will put the boil point at around 80 degrees. We have run 60 over 400's at 12 to 1 like this in several cars with NO problems. A good fan shroud and fan and the above process. Just change the water every month or so.

Ego Racing
posted February 09, 2004 07:48 PM
At some of the tracks in Florida if you are cought running antifreeze they will DQ you. I know of one time they fined the driver for cleanup of it. He could not run again until he paid the fine.

posted February 10, 2004 12:00 PM
Listen to Wauge, he knows Especially how to get more money from your home. Thanks Mark. I run a gas car with a very small motor. Drilling holes in the front of my nose piece worked great for me without having a shroud. Also, if you take zip ties and pull the bottom of the nose piece up to your bumper it will allow more air in. Worked for me but remember I had a small motor.

posted February 10, 2004 11:38 PM
C&R radiator is a must with gas. They have a better fin pattern and are made better than any other one. gl ltr speed

posted February 11, 2004 11:55 AM
set pully ratio so water pump runs max of 6200 rpm no as close to radiator as you dare.3/8" is good. Good aluminum radiator distiled water.
Two main things water flow and air flow.

posted February 11, 2004 01:25 PM
I saw some dyno readings on the net and the Alcohol made about 6 horsepower over gas.