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04-13-2016, 02:36 PM | #1 |
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Join Date: May 2010
Location: Kaukauna, Wisconsin
Posts: 394
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Manifold machining
I recently attempted to machine a manifold assembly. I mounted the assembly using the carburetor mounting to fasten it to an angle plate on my milling machine. In doing so I noticed that the manifold mounting surface is not perpendicular to the carburetor surface. I measure approximately 0.024" difference from one side to the other on the 2" width. Does anyone know if there is an angle at which the manifold should be mounted when machining or will machining them perpendicular to the carburetor cause any problem? I would appreciate any information that I receive. Thanks. Don/WI
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04-13-2016, 02:43 PM | #2 |
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Re: Manifold machining
The engine crankshaft center line is engineered at a 3 degree angle down towards the back of the car. When installed the carb hangs level, so the mounting flange of the intake manifold is machined off at a 3 degree angle also. You may try to use the center 2 ports of the exhaust manifold as your datum to set it in level, this part of the manifold is thick and square, least likely to warp as compared to the ends.
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Mark in MT Always looking for another opportunity to be wrong. |
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04-13-2016, 03:14 PM | #3 | |
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Re: Manifold machining
Quote:
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04-13-2016, 05:22 PM | #4 |
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Location: So Cal
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Re: Manifold machining
Here is a small picture someone posted of a fixture.
Bob |
04-13-2016, 11:17 PM | #5 |
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Location: albany
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Re: Manifold machining
best method for those is to surface grind I doubt youll be able to hold it rigidly enough to machine it...
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04-14-2016, 04:43 AM | #6 |
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Re: Manifold machining
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04-14-2016, 06:04 AM | #7 |
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Re: Manifold machining
I have a Van Norman 561, it came with lead fingers for fixturing exhaust manifolds-----
The last manifold I used a belt sander and a file because I was home and that is what I had to use there, perhaps a bit slow, but it doesn't leak I have fixtured similar shapes in a bed of bondo---wrap the part in shrink wrap and settle it into a large gob of bondo |
04-14-2016, 06:53 AM | #8 |
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Re: Manifold machining
I use a belt sander. It works fine. Be sure to wear a mask, as the dust is bad for the throat.
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04-14-2016, 07:03 AM | #9 |
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Re: Manifold machining
My guy, Majewski Machine, Trenton, NJ, uses a blanchard. The Blanchard uses a large array of segmented stones and a large magnetic rotating table. It leaves circular grinding marks from the stones. But I think the original posting dealt with whether or not the carburetor mounting surface was exactly 90 deg. to the block surface. I have not seen or heard of a anything but a 90 deg. relationship between the two.
Terry |
04-14-2016, 10:25 AM | #10 | |
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Re: Manifold machining
Quote:
Thanks also for all the replies. I learned a few things. Don/WI |
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