How to make a 52mm TB?
Thread Starter
Registered User
Joined: Jun 2003
Posts: 270
From: Austin
How to make a 52mm TB?
Ok, does anyone have instructions to do this? My Dad own a machine shop and could easily bore my 48mm TB out to a 52mm. Instructions would be great and also where to be the new "fins" that go inside. Thanks in adavance-------------> Brad
Registered User
Joined: Dec 2000
Posts: 2,442
From: Tacoma, WA, USA
Hey, if your Dad has his own machine shop he should be able to figure out how to bore it out. You've got it easy with all the equipment available.
As far as I know, all that's needed is the overbore (of course), then fabbing up some throttle blades that will fit. Make them identical to the factory blades, just a hair larger.
As far as I know, all that's needed is the overbore (of course), then fabbing up some throttle blades that will fit. Make them identical to the factory blades, just a hair larger.
Thread Starter
Registered User
Joined: Jun 2003
Posts: 270
From: Austin
Sounds like a plan, thanks for responding. I guess I was wondering mostly about fabricating new fins for it or if anyone sold tb fins just to make the job easier. Anybody know if 52mm is the most I can bore it out to or can I go larger? Thanks again ----> Brad
Registered User
Joined: May 2000
Posts: 1,327
From: Under my Car as usual :)
52 is the biggest you can go without moving the bores inward. You can buy the blades pre cut from me 10 at a time at $15 each.
Good luck, it's alot more complicated to get a good throttle body without some serious R&D. I'll give ya a hand shake if you can figure out how to get it apart without cutting the shaft or anything on it
I spent a few hundred bucks on 5 throttle bodie before I ever got the flow I wanted and the blade tip in, etc perfect. Thats why mine f'ing rock Lol
-Shannon
Good luck, it's alot more complicated to get a good throttle body without some serious R&D. I'll give ya a hand shake if you can figure out how to get it apart without cutting the shaft or anything on it
I spent a few hundred bucks on 5 throttle bodie before I ever got the flow I wanted and the blade tip in, etc perfect. Thats why mine f'ing rock
Lol-Shannon
Registered User
Joined: May 2000
Posts: 1,327
From: Under my Car as usual :)
Originally posted by atljar
search for user NOMAD . He bores them out and sells them. If anyone knows, he does, but i dont know if he will want to tell his tricks.
search for user NOMAD . He bores them out and sells them. If anyone knows, he does, but i dont know if he will want to tell his tricks.
Check out nkyfba.com cruise portion of the board. I think i'm gonna try to get to the track next weekend I fi can locate some slicks
-Shannon
Registered User
Joined: Feb 2001
Posts: 3,068
From: Cincinnati, Ohio
I SWEAR that the car hasnt had a day at the track with more than 2 runs on it. I'm shooting for the 25th of october at tri-state. Im off work that night, so should be a good day to abuse the car and get plenty of runs in, both with and without the TB. I did make 357rwhp with stock heads and your TB, is that worth anything???
Registered User
Joined: May 2000
Posts: 1,327
From: Under my Car as usual :)
Originally posted by atljar
I SWEAR that the car hasnt had a day at the track with more than 2 runs on it. I'm shooting for the 25th of october at tri-state. Im off work that night, so should be a good day to abuse the car and get plenty of runs in, both with and without the TB. I did make 357rwhp with stock heads and your TB, is that worth anything???
I SWEAR that the car hasnt had a day at the track with more than 2 runs on it. I'm shooting for the 25th of october at tri-state. Im off work that night, so should be a good day to abuse the car and get plenty of runs in, both with and without the TB. I did make 357rwhp with stock heads and your TB, is that worth anything???
I'm shooting for the same date, So i'll prolly see ya there
-Shannon
Registered User
Joined: Jul 2000
Posts: 814
From: Phoenix AZ
I took mine to a local machine shop, explained what I wanted done, and he did it. Cost for taking it apart, boring it out, puting it back together, and installing the blades I provided him-$100
Blades cost me $24(pair) from Arizona Speed & Marine.
Total cost-$124.
The guy had never bored out a throttle body before and it came out perfect.
BTW-$15 a blade!, 10 at a time! Wow.
Blades cost me $24(pair) from Arizona Speed & Marine.
Total cost-$124.
The guy had never bored out a throttle body before and it came out perfect.
BTW-$15 a blade!, 10 at a time! Wow.
Registered User
Joined: Feb 2001
Posts: 3,068
From: Cincinnati, Ohio
Shannon knows im really happy with the TB. The bores are straight and smooth, blades are tight but dont stick. Speaking of the blades, the things he uses are SUPER thin. I would assume that splits the air cleaner and allows a tad more CFM to pass through. I know i used a BBK 58mm on a 383 i built, and the blades were much thicker. hope that helps a little.
