Water Pump, Underdrives and Serps!

[jb92563]

With the under drive pulley the belt speed would be lower and all the belt driven accessories would be slower to protect them from the extra wear and tear of driving at highter revs a lot.

I don't think the belt tension would change and in theory the slower speed would make the accessories driven by the belt last longer.

I guess your trying to get some stats to see if this is actually the case?

What is the diameter of the original vs U/D pulley I'd be curious to calculate what percent slower it makes things over the original?

[EssexPorsche]

Hi jb,
Yeah, trying to get some stats along those lines and also trying to ex-sponge thoughts from my mind that the pumps may possibly fail once they have been disturbed.

I totally agree with your theory about them lasting longer as they are underdriven. However i want to work out if that would only really be the case if it was underdriven from day 1. Sometime, disturbing certain areas on these cars in the pursuit of power and vanity seems to upset their balance and result in the failure of a part which may have continued quite happily for a number of years if it had not be disturbed. Somethings are better left alone and i am wondering if this is one of those.

I have the part waiting, just unsure weather or not its wise to fit it to old smokey!