mr whippy Posted April 2, 2011 Share Posted April 2, 2011 im toying with the idea to rear mount the rad in the v8 challenge truck so it doesnt clog with mud so easily the questions i have are as follows 1. how big or small a rad do i need 2. thermostat in or out 3. standard water pump or aux electric i was thinking of running 2 x 12" spal 12v fans on the rad any help or ideas would be appreciated. cheers Quote Link to comment Share on other sites More sharing options...
zim Posted April 2, 2011 Share Posted April 2, 2011 I run a big ally rad in the back a set of fans from a peugeot 306 td with cowling 38mm pipe 72 (or is it 74??) degree thermostat, with a couple little holes drilled in it standard pre serp water pump. I have to use a radiator fan switch, or it overcools. 4.2 v8, challenge truck. with hydraulic pump run off the crank - so the engine is doing it's fair share G Quote Link to comment Share on other sites More sharing options...
mr whippy Posted April 2, 2011 Author Share Posted April 2, 2011 how big a radiator ? ive been looking at a rs500 cosworth alloy rad 50 mm core & about 12 x 26 inches it will fit nice behind the rear bulkhead & below the deck of the tray back. Quote Link to comment Share on other sites More sharing options...
lansalot Posted April 10, 2011 Share Posted April 10, 2011 My mate has one on his 4.6 V8, rear mounted. Standard pump, mondeo cowl with twin fans. Standard apart from that. Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted April 10, 2011 Share Posted April 10, 2011 how big a radiator ? ive been looking at a rs500 cosworth alloy rad 50 mm core & about 12 x 26 inches it will fit nice behind the rear bulkhead & below the deck of the tray back. It's not how big a radiator - it's the cooling capacity of it. That's defined by material, design/construction, and operating conditions (temperature, coolant flow, air flow...), I'm sure if you google for info there'll be plenty out there to help you calculate what you need and then track down something suitable. Quote Link to comment Share on other sites More sharing options...
Escape Posted April 11, 2011 Share Posted April 11, 2011 If you can provide some airflow to the rad via the roof, that also helps a lot. Quote Link to comment Share on other sites More sharing options...
zim Posted April 11, 2011 Share Posted April 11, 2011 If you can provide some airflow to the rad via the roof, that also helps a lot. On the road yes...but in our challenge scene here in the UK your speed is not enough to help. G Quote Link to comment Share on other sites More sharing options...
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