Engine bay cooling

tomcat racing · #1 (**permalink**) 10-18-2008, 07:21 PM

get a custom alloy fan shroud fitted to your radiator with a 2800 cfm fan and you wont believe how much air pumps through your radiator, the air will escape from under the car, i checked out a lot of cars at the nationals and hardly any had shrouds fitted,a shroud is the single best thing to improve air flow. i live in NQ and it fixed my traffic light heating. norm at aussie desert coolers in melbourne will build you a custom alloy radiator with shroud and 2800 cfm fan for about $1200. most fans pump about 2200cfm. also for your water pump to work properly the top pulley has to be about 10% smaller than the bottom pulley so it overdrives the pump. what a joke the drb vents are dummys must have been a reason. good luck tomcat racing

acecob · #2 (**permalink**) 10-19-2008, 01:05 AM

I own a DRB, heat has been a killer for me from day one, the reason the vent holes are not open is because the foot wells cover two thirds of where the hole is, I have cut holes in mine where the foot well ends and to be honest I dont think it has made much of a difference. even if the holes were bigger I dont think you would get much cooling from them as most uf the heat escapes from under the car anyway.

By the way in traffic, driving casually I dont get many probs its only when I drive it harder, It seems your prob is getting air through the radiator, like tomcat said a good flowing fan and a shroud could fix your prob

cameron02 · #3 (**permalink**) 10-19-2008, 03:27 AM

I made the vents on my DRB functional. I cut out the accessible 1/3 and made fibreglass tunnels to the engine bay. Simply cutting out the 1/3 will not have any affect as the engine bay is still blocked off, it will simply pull air from the wheel arch area. I would post pics but my car is in for painting at the moment.

The vents offer virtually nil cooling when the car is stationary. As far as I know they work like this.

As you are driving the air passes over the vents. Because the vents are rear facing the air passing over them has a pulling effect (suction). This results in air being pulled out through the vents.

Ceramic coating you headers will also help reduce under bonnet temps but if your engine is overheating then the cuuses could be multiple. Air in the system, unsuitable radiator etc. You could try fitting a thermo fan to the front or rear of the radiator for extra cooling.