:::RHMT::: Real Home Made Turbo
General Category => Fabrication => Topic started by: HiProfile on June 27, 2014, 04:25:36 PM
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This started almost a decade ago when I worked at a machine & engineering shop. I made a jig to hold the TB in their big lathes, but I had nothing big enough after I quit. I never refined it to the stage to make the plate properly until recently.
I made a new jig for my little lathe to hold a Honda throttle body (D/B/H and K). It allows me to center the TB, thin the brass sheet I use for the throttle plate, and even cuts the throttle plate with a bevel on the ends. I first used it to make the tb-manifold adapter plate for my K20A PRB manifold to seal a B-series throttle body perfectly. After that I made my first 64.39mm throttle body plate.
(https://lh5.googleusercontent.com/-CqX3zhcSf14/U63P1WjTDvI/AAAAAAAABEA/yXvsVFaI8jM/w993-h807-no/throttl+body+boring+jig+1.jpg)
The center cylinder is removable when I bore the throttle body. When I cut the TB plate, I test the fit by slipping the bored TB over it. If it's too tight, I shave the plate another thousandth.
(https://lh6.googleusercontent.com/-CkfYIhA0pDk/U63QauW77zI/AAAAAAAABEY/HHpNW0pIysk/w1071-h807-no/throttl+body+boring+jig+2.jpg)
This TB was bored years ago with a crappy bit at the machine shop, but the plate was cut on my new jig. Future TB bores will be much smoother.
(https://lh3.googleusercontent.com/-M0js2luLgAI/U63JPLWkGqI/AAAAAAAABCs/1XheDkH4-uk/w1016-h879-no/64mm+throttle+body+bore.jpg)
Here's the bevel, which is about a 6.5 degree cut. Stock is about 8-9 degrees, but the larger bore at that angle would put the plate past the first EVAP hole (bottom nipple in above pic). The gap around the plate is less than a human hair, and there is no sticking since the edge of the plate sits flat against the inside bore.
(https://lh6.googleusercontent.com/-aiyWgtFEQi8/U63JOK6U3LI/AAAAAAAABCg/sQBL9u3wM0o/w1132-h879-no/64mm+throttle+body+plate.jpg)
FYI I don't plan on boring TB's for anyone else, it's not worth the time. Maxbore's service or 68-70mm Omni TB will be a better deal for most people anyways. I made this primarily since I needed to make a thin TB spacer.
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All that and then I see the bad news at the end. I was really hoping to ship some TB's to you. lol
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If it works out well, I might reconsider. I just have too many things to do first, sorry.
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What if I sent you a tb just to taper like chris m used to.