Visit The Dirt Forum for More Information

Author Topic:   Fan/Shroud/Rad?
Dirt Forum Racer

Total posts: 96
posted August 21, 2002 02:08 PM
Just starting drawing up plans for a cooling system on a new chassis I hope to build this winter. My thoughts so far are:
1, use a fixed 6 blade ali fan.
2, the fan to be 1" from the rad.
3, use a full shroud which is a good fit against the rad & has 1/2" clearance around the fan.
4, leave about 3/4" of fan blade sticking out the back of the shroud.
5, not sure wether to go with a crossflow rad or a vertical with surge tank?
6, a 22psi rad cap.
7, using ali heads so I may put extra plumbing from the rear of the inlet manifold to the front.
8, using a aftermarket waterpump with no restrictors & 30% reduction pulleys.
9, short lengths of good quality hose.
10, louvered grill 12" in front of rad to prevent clogging & damage.
Still not sure what type of rad to go for, any suggestions? Or anything I might of missed or you strongly disagree with? If so let please let me know & why.

Dirt Freak

Total posts: 240
posted August 21, 2002 04:48 PM
Everything looks good, Are you running alchohol? cause if you are, you can probably do away with the shroud, alky runs so cool the shroud may not be a necessity. As far as the radiator goes, most anything should work, I have seen mostly aluminum, but have seen one or two brass. alum is easy and not too expensive. Very good planning

Dirt Forum Racer

Total posts: 96
posted August 21, 2002 05:13 PM
Running gas in Chevy 454 at 10.5:1. I always like to think that I've got all the bases covered when it comes to looking after the expensive bit.

Dirt Roller

Total posts: 7
posted August 21, 2002 07:47 PM
I recently read in Circle Track mag. where they recommended using a cookie cutter type shroud instead of the full shroud. I think the article also said to build the shroud so the fan was half in and half out of the shroud.

We tried it this year and haven't had any problems. We run 180 degree thermostat.

Best of all it really simple to build.

Back to the Archives