Bullet Ride's M20 ITB Project: I can go with the flow...

[jute91]

http://speedtalk.com/forum/viewtopic.php?f=1&t=31132

found something for you.

im going to use 731 head, b25 inlet valve, b20 exhaust valve

[Bullet Ride]

This is very interesting.

Giving good thoughts for my own itb project..

Do you include intake port to your plans? You are now doing just another "curve" to different position. Notice that intake channel has already 2 curves as it should be one tightening curve to accelerate air flow

Are you talking about modifying the intake ports in the cylinder head?

[deutschman]

Very interested. I am thinking of doing something like this my self in the future. Thanks for sharing! Subscribed

[jute91]

[jute91]

This is very interesting.

Giving good thoughts for my own itb project..

Do you include intake port to your plans? You are now doing just another "curve" to different position. Notice that intake channel has already 2 curves as it should be one tightening curve to accelerate air flow

Here how it should be done.



And my own drawing

[Bullet Ride]

Small updates:

The aluminum tubing showed up a couple days ago, so next week I'll cut a couple pieces and get them tacked on to the manifold in order to check clearances. I also made up a set of stainless steel spacers to space one set of throttle bodies...



I'm still considering what approach to use to extending the throttle sync tabs. Right now I'm thinking that since it's only 8mm they have to be extended I will just build them up with weld and then just grind them back down to the proper thickness. If that doesn't work I'll have to cut off the current tabs and fashion a small piece out of flat bar that can be welded on...

[iwantspeed]

you have my attention

• me being a mechanical engineering major
• currently working at a cnc shop for the past 3 years
• I have a good grasp of solidworks.

subscribed

[defaultName]

Why, you don't like Bruno's M42 ITB design? :p

Oh I do! Because of his car I was researching M42 ITB's for a while.

But lately I've been thinking that it would be nice to have a few more cylinders. It could just be because I haven't driven my car in a while and I forgot how fun M42's can be.

Plus I've got a 325i convertible with 160,000 km's that I may be parting soon, so I'm tempted to swap in the M20.

[pacmanE30]

this looks good...in for the results

[Bullet Ride]

Please stop before you make me want to ditch my M42!

Why, you don't like Bruno's M42 ITB design? :p

[IronFreak]

Outstanding Sir!!!

[defaultName]

Please stop before you make me want to ditch my M42!

[CorvallisBMW]

sweet! excited to see more of this

[Bullet Ride]

You make it look so easy that anybody could do it.

That's the idea! :-)

[downforce22]

I like this a lot! You make it look so easy that anybody could do it.