jwr offenhauser dual port manifold

poo slinger · Post by **poo slinger** » Tue Mar 15, 2011 11:10 pm

at the back of the inlet manifold there is a hole with 2 threaded holes, what is this for and can it be blanked off?

JSF55 · Post by **JSF55** » Wed Mar 16, 2011 6:11 am

thats the water return from the heater matrix, if you'r not running a heater it's better if you loop a pipe from the water pump through it with a restrictor to stop the system airlocking and hot spotting

DEVONMAN · Post by **DEVONMAN** » Wed Mar 16, 2011 8:57 am

JSF55 wrote:thats the water return from the heater matrix, if you'r not running a heater it's better if you loop a pipe from the water pump through it with a restrictor to stop the system airlocking and hot spotting

It's actually a feed to the heater not a return, but I agree with the loop idea via a restrictor to the INLET of the water pump.
Regards Denis