Race Car Cooling Ideas......

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oneaves2005
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Race Car Cooling Ideas......

Post by oneaves2005 » Thu Jan 31, 2019 10:11 am

Hi All,

Having a re-think of the cooling system for one of my MGB V8 race cars.

This particular car is soon to be fitted with one of our 4.0ltr FPC engines, which produce just north of 400bhp and see constant high RPMs. The general tradition in our series is to fit an aftermarket aluminium radiator (not the cheap chinese stuff!) along with a DC electric water pump. The temps are always marginal, and realistically on a hot day, they run too hot.

From recent reading it appears that the DC water pumps are not really up to the job and flow significantly less than the stock pump, so I am toying with running the stock pump, although I suspect that cavitation may occur at high revs, and if i play with the pulley sizes then there will not be enough flow at idle. So the option on the pump front is to run the biggest 12v pump I can find, like the Stewart Components inline pump (55gpm) or to run the standard pump slower, with an electric booster pump for idle.

I also think I can get another 2" of length on the radiator, which due to the restricted width of the body of the car is a bit undersized.

I welcome everyone's thoughts and experiences on this?



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Ian Anderson
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Re: Race Car Cooling Ideas......

Post by Ian Anderson » Thu Jan 31, 2019 7:50 pm

Do you have a cabin heater?
If so remove it and block the circuit other than a 1/16 hole to allow air bleeding.

Basically you are now forcing all the coolant through the radiator.

In the GT40 arena we run radiators with a 60 by30 cm core in aluminium and 5 rows.

Some run up to 600 hp and they keep cool, with a standard water pump even with the 7 foot long pipes back and forward from engine to rad.

Airflow wise rule of thumb is free air in area 1/3 of core area and 2/3 for air exit. And the second one may be the problem as you have a tight engine bay., bonnet fins will help greatly to clear air and heat out.

Ian
Owner of an "On the Road" GT40 Replica by DAX powered by 3.9Hotwre Efi, worked over by DJ Motors. EFi Working but still does some kangaroo at low revs (Damn the speed limits) In to paint shop 18/03/08.

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Ian Anderson
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Joined: Sun Nov 19, 2006 9:46 pm
Location: Ashford,

Re: Race Car Cooling Ideas......

Post by Ian Anderson » Sat Feb 02, 2019 8:39 am

Owner of an "On the Road" GT40 Replica by DAX powered by 3.9Hotwre Efi, worked over by DJ Motors. EFi Working but still does some kangaroo at low revs (Damn the speed limits) In to paint shop 18/03/08.

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