i got a 52mm tb
Registered User
Joined: Mar 2003
Posts: 1
Gee uh, wouldn't a die grinder be easier?
Porting the throttle body eh? Sounds pretty sweet. I'm kind of a head porting freak, (I don't think I've ever built an engine AND left the heads unmolested). Anyone have any good links on best ways to open up the TB via grinding?
And I do mean BEST ways, any idiot can dive in and take out material. Are there any things to watch for/keep in mind? Anyone reading this ever done it themselves?
Heh heh, I've got goosebumps just thinking about it. (Yup, call me a crazy car nut).
And I do mean BEST ways, any idiot can dive in and take out material. Are there any things to watch for/keep in mind? Anyone reading this ever done it themselves?
Heh heh, I've got goosebumps just thinking about it. (Yup, call me a crazy car nut).
Registered User
Joined: Sep 2002
Posts: 623
From: UT @ Austin
you can take an old TB gasket, place it on the back of the TB (where the gasket's supposed to go) then spray paint it red. This will draw out exactly 52mm for ya 
Then grind it all down (using the red paint as a guide), polish it up and voila! you're done.
If you want, it's usually good to polish up the butterfly blades as well. They have a few obvious restrictions and thier finish is quite restrictive as well... just make it so you can see yourself in all of your work when you're done
Then grind it all down (using the red paint as a guide), polish it up and voila! you're done.
If you want, it's usually good to polish up the butterfly blades as well. They have a few obvious restrictions and thier finish is quite restrictive as well... just make it so you can see yourself in all of your work when you're done
Last edited by Euclid; Mar 22, 2003 at 03:06 PM.
Registered User
Joined: Aug 2001
Posts: 870
From: Cuyahoga Falls, OHIO
Just a question for all you who've ported throttle bodies.
Do you use the same throttle plates? If you do, whats the point? You can port the throttle body to 900mm but if you still have the stock throttle plates it will still be a 48mm throttle body
Do you use the same throttle plates? If you do, whats the point? You can port the throttle body to 900mm but if you still have the stock throttle plates it will still be a 48mm throttle body
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Joined: Dec 1999
Posts: 1,697
From: Petersham, MA
Originally posted by Euclid
or you can borrow a friends dremel tool and do it yourself...
or you can borrow a friends dremel tool and do it yourself...
Not Quite!!! You need to have bigger throttle blades made up as well. So not only will the machine shop ACCURATELY bore to 52mm but you will have the proper size blades as well.
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Joined: Dec 1999
Posts: 1,697
From: Petersham, MA
Originally posted by 95z28 -quicksilver
Why not just buy a new throttlebody? It seems easier to me. No guesswork. Just my 2 cents.
Chris
Why not just buy a new throttlebody? It seems easier to me. No guesswork. Just my 2 cents.
Chris
Machined stock throttle body=$90.00 +/-
By the way, there is no guesswork!
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Joined: Aug 2001
Posts: 870
From: Cuyahoga Falls, OHIO
Originally posted by Josh-'97 WS6
Not Quite!!! You need to have bigger throttle blades made up as well. So not only will the machine shop ACCURATELY bore to 52mm but you will have the proper size blades as well.
Not Quite!!! You need to have bigger throttle blades made up as well. So not only will the machine shop ACCURATELY bore to 52mm but you will have the proper size blades as well.
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Joined: Dec 1999
Posts: 1,697
From: Petersham, MA
Originally posted by Grease
Okay, I was under the impression people just ported/hogged out the throttlebody but never changed the throttle plates
Okay, I was under the impression people just ported/hogged out the throttlebody but never changed the throttle plates
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Joined: May 2000
Posts: 1,327
From: Under my Car as usual :)
Yes, you have to buy new blades or your gonna have a 2mm gap in the top and bottom of the throttle body. No, you can't do it with a dremel, die grinder, hole saw, etc.
It takes a little research to get these things accurate. IAC holes need to be "adjusted" and such. The throttle shaft needs to have the sides cut so the bigger blades will fit also.
Make sure you actually got a 52mm, there are plenty of fakes out there
-Shannon
It takes a little research to get these things accurate. IAC holes need to be "adjusted" and such. The throttle shaft needs to have the sides cut so the bigger blades will fit also.
Make sure you actually got a 52mm, there are plenty of fakes out there
-Shannon