I've got a little project I will be working on. Nothing too hardcore like some of you guys, I'm just trying to bore out a b18b throttle body a few mm.

I'm a machinist/mold maker, so that part of the job is no big deal . I'm just wondering if there's a certain type/grade of brass which is recommended to make the throttle plate out of. Or does it even really matter? We have tons of 420 stainless lying around so I would just use that, but could it wear the aluminum over time? Or should I just order some brass sheet stock?

Any thougts/input would be appreciated, thanks.

-Rob

 

i have tried this before too... boring was no problem but fitting the plate afterward so that it seals properly was impossible. i just used stainless. i ended up giving up on the project.

if you look closely at the throttle plate in profile you will see that it is eliptical in shape. that is to say that the sealing edge of the bottom and the top of the plate is tapered so that only the following edge is sealing against the bore of the t-b.

personally, i think you'd be better off to find a throttle plate out of another t-b and just bore your t-b to fit it.

 

I though about that, but if I had something with a larger plate, I may as well just use that TB no?

I have access to a wire edm, so I was planning to measure the "ellipticism" and just scale it bigger and cut it out like that.

Though I have heard thats it can be hard to fit properly, I may have to make it oversize and hand fit it or something but I don't think it will be too hard.

Oh well, I'm determined to give it a shot so at worst I will be out a $20 TB and a couple hours of my time