SD1 pully conversion for shortwaterpump??

Jono FD3 · Post by **Jono FD3** » Mon Feb 06, 2012 4:31 pm

Guys, I've been wondering, has anyone made a pully so that you can run the short P5/P6 waterpump but keep the SD1 bottom pully and aulternator? Basicaly (as far as I can see) all it would mean is to have a dish machined in to the pump pully to bring the drive inline with the bottom pully...... has this been done before??

Jono

unstable load · Post by **unstable load** » Tue Feb 07, 2012 12:32 pm

You could be adding way too much stress to the pump bearings with that offset.

Jono FD3 · Post by **Jono FD3** » Tue Feb 07, 2012 12:34 pm

Alloy pully would be light enough to not stress the pump??
What sort of difference is there in the position of the pully between the P5 and the SD1?

Jono

SuperV8 · Post by **SuperV8** » Tue Feb 07, 2012 1:08 pm

It's not the weight of the pulley but the force exerted by the belt you should be concerned about. The further away from the bearing the greater the force on the bearing.

Having said that I reversed and spaced my serp pulley to line up with my supercharger pulley. I did this knowing it would greatly reduce the life of the waterpump. I have since changed the pulley arrangement back to standard (for other reasons) but it ran fine when it was spaced.

I figured the water pump bearings are also designed to hold the viscus fan so 'should' be over engineered!

Tom.

Jono FD3 · Post by **Jono FD3** » Tue Feb 07, 2012 4:19 pm

Was going to say that I'm not running the mechanical blender on the front of it, so that will reduce the strain again!

Post by **katanaman** » Tue Feb 07, 2012 5:27 pm

it would need to be a custom pulley and I think the pump will fail as well with the stress cause by the belt. Its sits quite a bit further out. Is there a reason you cant use the SD1 pump? its a straight bolt on to the P5-6 front cover.

Robrover · Post by **Robrover** » Wed Feb 08, 2012 7:01 am

I'm running a short nose Buick pump with a standard sd1 crank pulley underneath. I used a 1964 EH Holden pump pulley which lines up just right - can get off ebay.com.au or online from one of the many Aussie classic Holden stores such as Rare Spares.