Over bored throttle bodies (Honda OEM)
 

Hey .
I have been boring throttle bodies for a few years, mainly Honda. All types D , B , H series.
I have a post on Honda-tech that explains what I do and how much. Basically I charge $100 for the machining, make a new butterfly out of brass, then taper and polish the opening. I also reinstall the TPS and set it back to OEM specs. Return shipping is included in the price. I take one to two business days to get the job done.
I can do FedEx if you have to have it back quickly.
Thanks, here is the link:
http://www.honda-tech.com/zerothread?id=598639

Re:Over bored throttle bodies (Honda OEM)
 

What do you use to bore that thing out? Is it just boring and making the new butterfly. Or is there more to it. That's pretty cool rather than buying a "super jdm edelbrock trust model" for only $15,000. ;D

Re:Over bored throttle bodies (Honda OEM)
 

I'm sure he uses a lathe with a tapering style tool. I use to have my local machinist to throttle bodies all the time. Good price though most want 150.

Re:Over bored throttle bodies (Honda OEM)
 

i might be interested in that. that is pretty cool and some clean ass work....

Re:Over bored throttle bodies (Honda OEM)
 

I'm interested, i have a GSR tb and i was wondering what the MAX!! you could go is? same with a b16 tb. you said like 4mm over is safe, but can you go anymore?

Re:Over bored throttle bodies (Honda OEM)
 

I thought B16 TBs were 60mm, that should go to 64 then, not 62... I'm gonna have to measure mine tomorrow, If it's only 58, I'd be kinda upset... and then I may have to do this...

Re:Over bored throttle bodies (Honda OEM)
 

Doing the machining part is very easy. Fitting the butterfly and getting a good seal is where I make the money. I have seen throttle bodies bored by other companies and they either stick or have a noticeable gap which can make setting idle difficult. I say 4mm over is the most I can do and sometimes on special request I can go baybe .5 to 1mm over that. But the customer undertands that "he" is taking chances with the throttle body.
About stock diameter, if your B16 is a JDM first gen, then it is 58mm. If it is a US or second gen then it is 60mm.

Re:Over bored throttle bodies (Honda OEM)
 

Hmmm, I may be interested in this also. I've had a ported and polished intake mani for my B18 just sitting in my room because I wanted a bored throttlebody to go along with it. I may get back to you. :)

Re:Over bored throttle bodies (Honda OEM)
 

so you can do a second gen 60mm to 64mm safely? thanks

Re:Over bored throttle bodies (Honda OEM)
 

Yes. 4mm over stock is fine.
Anyone interested, please dop me a line at my email address:
jorgep@gbronline.com
Thanks