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

 

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.

 

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.

 

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

 

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...

 

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.

 

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.

 

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

 

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