can your get an iron exhaust manifold planed?

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xavier
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Mon Mar 10, 2014 10:59 am

Can you get an iron exhaust manifold planed to true up the surface that comes in contact with the head?
pacerpete
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Mon Mar 10, 2014 11:06 am

Yes, a pretty straightforward task for a machine shop.
daimlerman
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Mon Mar 10, 2014 12:15 pm

I would not attempt to plane one,I would be asking for the thing to be 'surface ground flat',myself!
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gareth
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Tue Mar 11, 2014 12:46 am

No need at all malc, a fly cutter will do the job just fine, as it does on cylinder head faces.

Surface grinding a manifold is overkill of the highest order! :)
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xavier
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Tue Mar 11, 2014 11:06 am

what is the difference between the two?
daimlerman
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Tue Mar 11, 2014 3:50 pm

I have'nt a clue!

My answer is based on dealing with a warped manifold about 20 years ago,when I was running an E28 520i that pulled three studs out.

I'm happy to plane timber,but my plane does not go near metal,it makes an 'orrible mess of the blade.
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Brianmoooore
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Tue Mar 11, 2014 7:18 pm

Having a branch of the family heavily into all things CNC, I can answer this one. Fly cutter is a blade similar to that which would be held static against the rotating workpiece in a lathe, but is mounted on a rotating wheel instead. With the workpiece moved against the rotating cutter, it will just cut a circular groove in the surface, but if either the cutting wheel or the workpiece is moved around, the whole surface will be ground flat.
A surface grinder is similar in principle, but substitutes a (usually) cup shaped grinding wheel for the fly cutter.
DanThe
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Tue Mar 11, 2014 8:43 pm

Check out this badboy! :D

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Specially made for an M30 cast manifold? winkeye
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martauto
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Thu Mar 13, 2014 4:57 pm

xavier wrote:what is the difference between the two?
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This is a cnc milling machine and would kill a manifold but with a multi-toothed cutter . The die on the m/c is part of a mould for a "really useful box"

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capri_rob
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Sat Mar 15, 2014 4:12 pm

yes you can - had mine done by the machine shop who sorted the head test/skim/rebuild out - they said its a bit of a pig to do but its doable.
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Dave_M3
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Sun Mar 16, 2014 11:06 pm

Clamping the manifolds is awkward but other than that, it's a very basic task and it's the same as skimming a head or block.

I skimmed the cast exhaust manifold on my TD5 Defender twice as they kept warping and snapping studs. Fitted an aftermarket one then though and had no more issues :)


Machined an M42 manifold that a friend warped when he got it welded too and was perfect afterwards.
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davethegoat
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Sun Mar 16, 2014 11:34 pm

It doesn't help the OP much, but I've used these guys for cylinder heads. A manifold would be a piece of wee I'm sure. http://www.precision-lapping.co.uk/ Pity manifolds are heavy and expensive to post!
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