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Old 06-09-2021, 08:17 PM   #1
spock345
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Default Warped B18/20 SU manifold

I finally go around to just yanking the manifold off my car to see what was going on with the lean condition on cylinder 1. turns out the mating surfaces on the manifold aren't true.

Is it worth it to take it down to the local machine shop to get it surfaced and cleaned up or should i just go get another manifold?
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Old 06-09-2021, 10:31 PM   #2
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I've had my turbo exhaust manifold flattened, definitely helped.
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Old 06-09-2021, 10:35 PM   #3
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This is turbobricks, put some sandpaper on a flat surface and make a second flat surface
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Old 06-09-2021, 11:56 PM   #4
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This is turbobricks, put some sandpaper on a flat surface and make a second flat surface
I'd agree for the alloy intake manifold, but the cast iron on the exhaust manifolds is pretty tough stuff.
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Old 06-10-2021, 12:43 AM   #5
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Get a faster flat surface
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Old 06-10-2021, 01:38 AM   #6
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Quote:
Originally Posted by spock345 View Post
I finally go around to just yanking the manifold off my car to see what was going on with the lean condition on cylinder 1. turns out the mating surfaces on the manifold aren't true.

Is it worth it to take it down to the local machine shop to get it surfaced and cleaned up or should i just go get another manifold?
Your intake manifold? My exhaust manifold is wobbly, cleaned it up and bolted back on with a new gasket. Sealed up just fine.
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Old 06-10-2021, 09:13 AM   #7
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I face stuff like this on a big belt sander. Spray some paint on the flange and sand until it's all gone and level. Done .
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Old 06-10-2021, 10:16 AM   #8
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Drop it at the machine shop. It’ll cost like 20-50$, have them do both sides if they done mind.
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Old 06-10-2021, 10:27 AM   #9
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$20 ÷ 17¢ / hr = 117.64 hours surely enough time to flatten even Volvo's finest cast iron?
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Old 06-10-2021, 10:27 AM   #10
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Drop it at the machine shop. It’ll cost like 20-50$, have them do both sides if they done mind.
Ok, I'll go bring it by today. If they don't want to do it I guess I'll do the sandpaper taped to a pane of glass method (the janky way they do cylinder heads). I've got a mirror laying around somewhere.
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Old 06-10-2021, 10:45 AM   #11
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The plate glass method works good with a little bit of time spent. Get some auto body #80 grit long board sand paper with the adhesive back so you can stick it to the glass.
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Old 06-10-2021, 04:02 PM   #12
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It seems to have worked OK. I painted the surface and sanded until the paint was gone with 80 grit. Then sanded with 120 and 220 to smooth it all out.
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Old 06-10-2021, 07:47 PM   #13
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Automotive Belt Sander (or sometimes called a Belt Surfacer, or Platen Grinder) in action: https://www.youtube.com/watch?v=_X091HmGt7M
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Old 06-10-2021, 08:37 PM   #14
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Automotive Belt Sander (or sometimes called a Belt Surfacer, or Platen Grinder) in action: https://www.youtube.com/watch?v=_X091HmGt7M
Ok, next time I need to do this sort of work I am finding someone with one of those.
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