Visit The Dirt Forum for More Information

Author Topic:   ENGINE RUNNING HOT..
Nobra14
Member
posted September 15, 2003 11:28 AM
Need any info or help. on cooling techniques. 90 degree outside temp.

Street Stock, 355 flat top, aluminum radiator, shroud. steel fan, 3-5 inches from radiater (which is tilted) fan inside shroud which is tilted. 36 degree advance, 5/8 water restrictor.
240-245 degrees temp.

Have considered mounting small water tank in trunk to spray radiater, any idea,s...
Thanks


Flanndad
Member
posted September 15, 2003 11:51 AM
I got basically the same question running in the engine section.


GO 24
Member
posted September 15, 2003 12:08 PM
Is the fan half in/half out of the shroud? I prefer the 4 blade fans to the 6 blades, a GOOD alum water pump if alowed, distilled water (can be good for 5 to 10 degrees, maybe more), are you running straight water or a mix? Some will disagree but I slow down my water pump pulley, check your cap to make sure it's good, and lastly if you don't have one rivet a plastic flap under the radiator to help catch the air coming under the car. Anyways a few things to look at....


Nobra14
Member
posted September 15, 2003 12:18 PM
Fan is inside shroud all the way,6 blade, stock pump, stock aluminum pulleys,50/50 mix, 22-24 lb cap,and i do have a piece under the front of the car in front of radiater.

[This message has been edited by Nobra14 (edited September 15, 2003).]

dirtrace54
Member
posted September 15, 2003 02:37 PM
Straight water does cool the best. But if your overheating, there is still another problem. We always run our fans half in and half out of the shroud. You could be moving the water too fast through the system and may need to use reduction pulleys to slow the flow down and give the water a chance to cool in the radiator. Another possibilty, is that if the radiator is used there could be a problem with it. We have bought 3 different radiators in the past...ALL USED.. and had nothing but problems with them. The brand new one we bought after trying those 3 worked just fine. Hope this helps


dirtbuster
Member
posted September 15, 2003 03:38 PM
You want your fan half in and half out of the shroud in order to pull the most air. A stock pump wont pump well at higher rpms. It will cause cavitation, you may need to put reduction pulleys on to slow it down. Double check you carb jetting to make sure you are not a little on the lean side. Also the 4 blade fan as mentioned will help pull more air, but if the radiator is half plugged or otherwise not working 100% then additional air flow will not help.


dirtracer7
Member
posted September 15, 2003 03:48 PM
How far is the radiator tilted? you can tilt them some but the air can't get threw them as well as straight up.Whats in front of the radiator? a good shroud on that side will help to.


Nobra14
Member
posted September 15, 2003 03:54 PM
2 inches from top of blade to radiater and 4 inches from the bottom of fan to radiater.
Nothing in front but front cap with large opening.


Raz_900
Member
posted September 15, 2003 03:58 PM
It helped me a great deal putting plastic ductwork in front of the rad. Without the stock rad support to 'block' air and make it go through the rad, I think much of the cool air was coming through the bumper cover and whipping right around the front wheels. Path of least resistance.


racer17j
Member
posted September 15, 2003 07:24 PM
put a shop rag in front of your radiator in the shop and see if it sticks there at idle also as mentioned before how is your jetting could you possibly have a vacume leak somewhere? also what are you running for a coil and mod if your not getting good enough spark it will cause you to run hot also


Nobra14
Member
posted September 15, 2003 07:45 PM
HEI DISTR. HIGH OUTPUT COIL. Holley 4412, 74 jets. Spark plugs light tan colored ceramic.No vacumn leaks i can see.


dirtracer7
Member
posted September 15, 2003 07:55 PM
If you have any questions on shrouds check circle track magazine , can't remember when but it has an article on how to make the shrouds. I made one something like theirs and haven't had any cooling problems all year.Both sides of the radiator.


Rockie
Member
posted September 15, 2003 08:14 PM
quote:
Originally posted by Nobra14:
Fan is inside shroud all the way,6 blade, stock pump, stock aluminum pulleys,50/50 mix, 22-24 lb cap,and i do have a piece under the front of the car in front of radiater.

[This message has been edited by Nobra14 (edited September 15, 2003).]




Back to the Archives