2 replies to this topic

[clubman katie B.F]

hi all, could do with some physics advice.
My 1275 engine is getting just a little warm at times, have just put the engine into the car, it's fairly standard, with just a stage one kit and a sw5 cam in there. when fitting the new water pump, i had the choice of 2 different sized pulley wheels for the fan belt. i fitted the larger diameter of the two.
here comes the physics bit....if i put the smaller one on, would the fan turn faster, therefore cooling the engine more???? like changing gear on your push bike, the smaller the cog the faster the speed?
thanks in advance for your help

[Sprocket]

Bigger pulley will slow down the water pump reducing cavitation at higher engine speeds but also slowing fan( suspect thats why they fit an electric fan to assist in heavy traffic where engine speeds are generaly low. All A+ 1275 engines use this pulley, but if you fit this to a 998 a spacer is required. If you have the narrow impellor pump, change it to the bigger impellor pump.

[clubman katie B.F]

oh b**ger...thought i was being clever there, well tight actually, have been putting of buying a two core rad for years lol