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Throttle body porting

 
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phydeaux
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Joined: 05 Mar 2007
Posts: 84

3114.12 points


1997 Oldsmobile Aurora

PostPosted: Tue Dec 30, 2014 4:09 pm    Post subject: Throttle body porting Reply with quote

Now that I have access to a full CNC machine shop I'd like to step my throttle body up to 80mm from 75mm. Any tips, tricks, or warnings? Also, where can I get my hands on an 80mm flap? I guess in the end I could make one.
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clay
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Joined: 24 Nov 2002
Posts: 3209
Location: South Carolina
318129.23 points


1972 Chevrolet Nova

PostPosted: Wed Dec 31, 2014 2:06 pm    Post subject: Reply with quote

I bored one on a 95 Mustang from 60 to 65. One thing I ran into to look out for is I broke into the bores that the pivot ball bearings are in. This created a large vacuum leak. I ended up filing flats on the sides of the throttle plate and sliding washers on the throttle shaft next to the bearings to effectively fill in the hole. I know this is a confusing description but something to look out for. I had one from another throttle body but it wouldn't be a big deal to make one either. I didn't have any passages that were close (mine only has idle air bypass) but check that too if you're has coolant or EGR passages. I can take a picture of the washer fix if you want it. Clay
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Paul P
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Joined: 15 Aug 2002
Posts: 2393
Location: Townsend, Mass.
81240.86 points


1971 Chevrolet Chevelle

PostPosted: Fri Jan 02, 2015 12:06 am    Post subject: Reply with quote

Get a boneyard one to test with. It is cool to be able to do it yourself. For a throttle body it might not be worth it in the long run. There are plenty of aftermarket ones out there to choose from that are made bigger with the correct bearings, seals and throttle plate. This isn't the first thing I would do if I had access to a CNC machine. Custom brackets is a place I would start.
Paul

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2001 Focus 2.0 Zetec
15.63@87 MPH 1/4mi
1971 - Chevelle 408 SBC N.A.
6.95@98.6 MPH 1/8mi
10.97@121 MPH 1/4mi
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phydeaux
Member


Joined: 05 Mar 2007
Posts: 84

3114.12 points


1997 Oldsmobile Aurora

PostPosted: Fri Jan 02, 2015 10:07 am    Post subject: Reply with quote

Good call on watching for other ports. That hadn't even crossed my mind. While I say I have access to a CNC machine shop, it is limited. This is a full production oilfield shop so I have to catch the right machine not being used, which is difficult.
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10sec.et
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Joined: 29 Mar 2006
Posts: 3472
Location: Houston,Texas
346624.78 points


1969 Oldsmobile Cutlass

PostPosted: Thu Jan 08, 2015 10:37 pm    Post subject: Reply with quote

what the hell are you working on now?
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phydeaux
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Joined: 05 Mar 2007
Posts: 84

3114.12 points


1997 Oldsmobile Aurora

PostPosted: Fri Jan 09, 2015 12:34 am    Post subject: Reply with quote

Making the Aurora breathe a little easier. If I can ever get clear of this custody battle and buying a house its gonna get a full sized northstar, forged internals, some rumptey cams, and a few others.
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