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Im sure there must be a reasonable explanation, but why is it that my stock manifold has a water feed. My old alfa had a heated intake for fuel economy, but we go to lengths to cool the intake charge then have it heated by the plenum?

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below zero climates could seriously stuff with your engine and its mechanical workings....for eg if you lived in japan and parked your skyline outside during winter :laugh: Same as the heater/cooler on the oil filter.

I thought it might be for emissions, but for a cold start up I thought the thermostat restricted water flowing untill the engine was warm anyway?

So could I use a brass T' piece to divert the flow from the head?...

-Might have to try that in summer, its still too cold in Tas (sympathy please :laugh: )

Edited by Medium Dave

Rob is on the money. When you have a shower of a morning, the steam condenses on the mirror. If the manifold is cold the same thing happens with fuel, it condenses on the inlet manifold, giving you a lean mixture which isnt conducive to smooth running with a cold engine.

no do not divert the water away from the head.

the head must always flow water.

You block each end of the inlet/outlet jacket to the plenum so its bypassed. This is easy on An RB30

I cant comment on the twincam stuff.

note! you will Have ruff start up if you live in cold areas....

You block each end of the inlet/outlet jacket to the plenum so its bypassed. This is easy on An RB30

I cant comment on the twincam stuff.

note! you will Have ruff start up if you live in cold areas....

That's what you do and what the negative is... what is the positive??

the water feed to teh turbo comes from the plenum .

if you are talking about the line that runs next to the injectors??? it comes out of the rear of the plenum around the back of the head and to the turbo... i wouldnt be blocking this off :blush:

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