Steve,
What company in New Zealand had this stuff? What dia pulley and where from on alternator? Inquiring minds want the specs?

Marc

On the Renesis I’ve put a race pump on to ‘reportedly’ reduce cavitation as the basic pump is reported to cavitate at the rpm’s we operate in during take off.
When I took out a restrictor in the return to the radiator on one flight tamper went up considerably and I reasoned this was caused by cavitation.
In response I purchased a race pump from New Zealand.

My water pump is running at OEM speed, but I slowed my alternator with a larger pulley.

> Hi : What is the optimum waterpump rpm for the 13B as i can modify the
> pulley diameter and ratio’s for my set - up The data i have is that at the standard ratio is 1:1.18  at 6500 rpm for the 13B the pump flo is round about 150 - 160 L per minute.
> So my question: If i run on 6500 rpm for take off then the waterpump impellor turns 6500 x 1.18 ???
> Must i put on a bigger diameter pully on the pump for a flo of round about 100 L per minute.?
> Don’t know  ?
>
> If somebody can help me with that