Show whole topic
Sep 21, 2012 11:00 am
Sep 21, 2012 11:00 am
Subject: Re: Water Pump Modification
I would really like to avoid overheating issues, now is the time to think about it!
The TR4 has a fan connected directly to the crank pulley, so in a traffic jam it does very little to cool and at high speed (when it's not needed so much) it cooling too much - simular to the Rapide.
At low speed the loss of bhp due to the mechanical fan is not great, at high speed the loss is greater as the fan is taking more power away for obvious reasons - it is generally thought with the TR4's 2.2l engine to be 10 bhp worst case.
So if you remove the mechanical fan and fit an electric fan you loose that inefficiency. The electric fan only comes on when needed so the rest of the time you gain the power you would have lost of the mechnical fan.
I would really like to avoid overheating issues, now is the time to think about it!
The TR4 has a fan connected directly to the crank pulley, so in a traffic jam it does very little to cool and at high speed (when it's not needed so much) it cooling too much - simular to the Rapide.
At low speed the loss of bhp due to the mechanical fan is not great, at high speed the loss is greater as the fan is taking more power away for obvious reasons - it is generally thought with the TR4's 2.2l engine to be 10 bhp worst case.
So if you remove the mechanical fan and fit an electric fan you loose that inefficiency. The electric fan only comes on when needed so the rest of the time you gain the power you would have lost of the mechnical fan.