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Help Dave put his car back together!

Skyrine-Dave

By Skyrine-Dave,
in Engines & Forced Induction

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Skyrine-Dave Mentor

Skyrine-Dave

Posted
Posted

Hey all,

Can i get some help as to where i plumb these parts up to...

In this pic is underneath the greddy plenum, i've got some water lines and the AAC valve. I've cirlced the ends that i need to hook up so some help there would be nice :)

plenum2.jpg

This pic has 2 water pipes that i dont know where they are meant to be plumbed up to... I also have the heater circuit to go inside the car.. which is only 2 pipes, AND i'll need to either run a water return or feed (which ever one is on this side of the block) from here too i take it?

rb30a.jpg

And lastly on this side of the block where are my oil feed, water feed/return :(

rb-block.jpg

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BHDave Grand Master

BHDave

Posted
Posted

The one in yellow is the air regulator valve (basically adds air when the engine is cold and slowly closes as it heats up), the other is the idle control valve. The yellow circled hose should be plumbed into the under side of the plenum somewhere. The 2 bare fittings can be connected and the green circled hose should be tapped into the intake pipe just in front of the throttle body. They aren't water fittings.

The water fitting on the side of the block i have no idea but the 2 smaller fittings off the top are for the stock throttle body water feed and return.

The oil feed is the one directly above the oil return fitting with what looks like a bolt in it and the water feed is at the back of the block right up the top. The other water feed runs around the back of the head and hooks into the back of the intake manifold i think.

Is this an rb20 or 25? as you have what looks like an rb25 aac valve but no water cooling on the oil filter which may be what the other 2 fittings would normally connect to.

BHDave Grand Master

BHDave

Posted
Posted

While the exhaust manifold is off i'd be swaping the exhaust studs too as the stock ones like to snap off, particularly the front and rear one. It'll cost less than 50 bucks and save you alot of hassle later on

Skyrine-Dave Mentor

Skyrine-Dave

Posted
  • Author
Posted

cheers BHDave :)

I thought one of them was a water line! silly me ;)

That information should come in handy :(

I do have another spare set of exh manifold studs, so i'll see how i go with getting them out, i just dont want to snap one off.

with the 2 water fittings on the block, which one is a feed and which is a return.... i really dont wanna plumb a return into a feed and have the flow clash

Its on an Rb25 head with the rb30 block for reference.

thanks again... any more info would be lovely :)

BHDave Grand Master

BHDave

Posted
Posted

I had a snapped one at the back on an engine i bought and the front snapped off when i was test fitting a new exhaust manifold. I hate removing snapped studs so i swapped them all for new ones. Auto one stock them if your interested.

With the water lines on the block one will be a high pressure and one a low pressure so as long as you plumb it with that in mind you should be right, even if you just connect them together. I'm assuming now as i dont know if the rb30 had water lines running to the throttle body.

Skyrine-Dave Mentor

Skyrine-Dave

Posted
  • Author
Posted

i'd take it the one with high pressure would be the one right behind the water pump??

i'm not going to run water lines thru the throttle body as its all on a greddy plenum, i just need to sort out water lines for my turbo return, and heater circuit.. that should be it

with the cold start valve... is it always open or closed when disconnected? as i think that might cause an air leak if i dont have it plugged into the loom ?

BHDave Grand Master

BHDave

Posted
Posted

Yep, the yellow ? connects to the green ? too.

I'd say the two big ones will be the heater circuit and you can simply connect the two smaller ones off the top of the larger lines. I'd be guessing but i reckon the front would be the higher pressure one.

For the turbo water return there should be a water connection at the back of the plenum and the other is a banjo as mentioned in my first post.

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