Modifying the ATP exhaust manifold....
03-09-2002, 09:09 AM
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Modifying the ATP exhaust manifold....
I was comparing the stock vs. ATP manifolds, and realized something.
the stock manifold flange is cut, the PES T28 manifold is cut, and I think the APR S3 manifold is cut as well (can someone confirm this?)
I'm guessing this is because Aluminum and Steel expand at different rates, so the manifolds are cut to allow for the different expansion rates.
The ATP is not cut.
<a href="http://johnbaas.dyndns.org/2point0/atp_man_sd.jpg"><img src="http://johnbaas.dyndns.org/2point0/atp_man_sd_lo.jpg"></a>
<a href="http://johnbaas.dyndns.org/2point0/atp_man_in.jpg"><img src="http://johnbaas.dyndns.org/2point0/atp_man_in_lo.jpg"></a>
What I'm proposing to do is cut the flanges between the ports, and then drilling a hole immediately behind the flange cut (to create a blank space between the runners)
What do you guys think? Because of the real short runners (compared to stock and APR), will the cutting actually do anything?
the stock manifold flange is cut, the PES T28 manifold is cut, and I think the APR S3 manifold is cut as well (can someone confirm this?)
I'm guessing this is because Aluminum and Steel expand at different rates, so the manifolds are cut to allow for the different expansion rates.
The ATP is not cut.
<a href="http://johnbaas.dyndns.org/2point0/atp_man_sd.jpg"><img src="http://johnbaas.dyndns.org/2point0/atp_man_sd_lo.jpg"></a>
<a href="http://johnbaas.dyndns.org/2point0/atp_man_in.jpg"><img src="http://johnbaas.dyndns.org/2point0/atp_man_in_lo.jpg"></a>
What I'm proposing to do is cut the flanges between the ports, and then drilling a hole immediately behind the flange cut (to create a blank space between the runners)
What do you guys think? Because of the real short runners (compared to stock and APR), will the cutting actually do anything?
03-09-2002, 11:16 AM
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Re: Modifying the ATP exhaust manifold....
I don't think your going to run in to any problems without the cuts. Just out of curiousity, what is the point of this? It expands you said, but if it can't will it crack or what?
I'm betting that unless you boost to the sky, that the T3/T4 will run much cooler and the exhaust manifold probably won't get as hot. Just a guess.
Have you talked to ATP about it yet? I'm curious what they have to say about it.
I'm betting that unless you boost to the sky, that the T3/T4 will run much cooler and the exhaust manifold probably won't get as hot. Just a guess.
Have you talked to ATP about it yet? I'm curious what they have to say about it.
03-09-2002, 09:39 PM
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The problem is the head expands/contracts....
but if the manifold won't let it, it could lead to a warped head. I'm not sure how severe of a warp, possibly machining the manifold seating area would fix it, but if it's something I can prevent by cutting a couple slots, then I'm going to do it.
03-11-2002, 10:06 AM
#7
good point. I bet Corky will say something in those lines too. Cast manifold at 900+ degrees vs
Aluminum head, I'd say go for it. Worst you get is an exhaust gasket leak after some time
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