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Another stupid question.... 

 

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 Post subject: Another stupid question....
Posted: Mon Apr 16, 2012 1:02 pm 
Stock as a Rock
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So im just wondering why is there water going into the EGR spacer on the 5L?. Ive just put fancy ford racing spacer on the DL to match the 65mm TB and it has the inlet/oulet on oposite sides as oposed to the standard one. What does the water do?...cool it? I would have thought it would pretty damn hot water going in and wouldnt do much for cooling at all.

And if it doesnt do much is it absolutely necessary?...can it just be blocked at the manifold?

 

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 Post subject: Re: Another stupid question....
Posted: Mon Apr 16, 2012 1:08 pm 
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Warm the air up for cold weather starts, perhaps?

 

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 Post subject: Re: Another stupid question....
Posted: Mon Apr 16, 2012 1:09 pm 
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Yeah thats the best thought I could come up with...but im in Queensland so not so sure how much that would be needed.....kinda doesnt make sense to put a cold air intake on just to heat it up.

 

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 Post subject: Re: Another stupid question....
Posted: Tue Apr 17, 2012 9:19 am 
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Its for the Yanks who live in cold climates, i'd assume to stop the throttle body from icing up?

We don't really have any need for it here.
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 Post subject: Re: Another stupid question....
Posted: Tue Apr 17, 2012 11:57 am 
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A few old engines we have here are like that, some with even the exhaust gasses warming it I think? But yeah, not really needed in Qld.

 

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 Post subject: Re: Another stupid question....
Posted: Tue Apr 17, 2012 1:27 pm 
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Nope - that water is Cooling Water - Seriously!.

On pre-Au's and some explorer manifolds EGR is run up through to the "Spacer" (which is your EGR housing). Exhaust Gas is hot.

So Water is used to stop it getting too hot - affecting your engines performance and efficiency.

Thank god it was deleted on the AU.

You cant just block them off either - well you can, but it will still get hot up there (EGR) until you block the EGR off properly (Im not sure how this is best done - perhaps at the heads, or the lower manifold?)

Nigel
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 Post subject: Re: Another stupid question....
Posted: Tue Apr 17, 2012 1:36 pm 
Stock as a Rock
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Cheers guys thanks for that

 

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 Post subject: Re: Another stupid question....
Posted: Tue Apr 17, 2012 4:32 pm 
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Nigel wrote:
Nope - that water is Cooling Water - Seriously!.

On pre-Au's and some explorer manifolds EGR is run up through to the "Spacer" (which is your EGR housing). Exhaust Gas is hot.

So Water is used to stop it getting too hot - affecting your engines performance and efficiency.

Thank god it was deleted on the AU.

You cant just block them off either - well you can, but it will still get hot up there (EGR) until you block the EGR off properly (Im not sure how this is best done - perhaps at the heads, or the lower manifold?)

Nigel


Zigactly!
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 Post subject: Re: Another stupid question....
Posted: Wed Apr 18, 2012 2:45 pm 
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I had my EGR off over the weekend and see the point, but there isn't any exhaust gas being directed through it is there? I can only imagine engine heat soak getting the EGR spacer hot. Would the coolant be much cooler than that? As for cold starts, the coolant is cold too...

Mike

 

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 Post subject: Re: Another stupid question....
Posted: Wed Apr 18, 2012 2:49 pm 
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Exhaust Temps are in the 00's of degrees. Engine coolant is 80 or 90 odd. Intake temps need to be as cold as they can be.

If the EGR is open, and gas is flowing then you'll be getting direct (very hot) Gas up there - and the temps will rise very quickly without cooling. It may seem irrelevant, but more heat = less performance and/or efficiency

Nigel
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 Post subject: Re: Another stupid question....
Posted: Wed Apr 18, 2012 3:03 pm 
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I think it also depends on the manifold as well doesnt it?....im pretty sure the explorer one that I put on didnt have the whole from the lower to the uper (could be wrong there)

 

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 Post subject: Re: Another stupid question....
Posted: Wed Apr 18, 2012 3:18 pm 
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Landau510 wrote:
I think it also depends on the manifold as well doesnt it?....im pretty sure the explorer one that I put on didnt have the whole from the lower to the uper (could be wrong there)


Yep that's right. Explorers had external EGR like trucks and then, when used in Oz, no EGR at all.
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