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Old 03-13-2012, 06:24 PM   #1
BMe30
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m42 itb build V2.0

well my new bigger itb's came in today

gsx-r 750 42mm



now this set up is a little different.. unlike the bmw k1100 itbs i had or the older 2000-2003 gsx-r itbs that have i casting per itb... these are 2 castings.. 1 casting for 2 intakes. kinda like the webber set up


here is a pic showing how close the center to center line up to the upper/lower intake manifold gasket




this will work out great.. i can seperate them into two units and weld short runners to this....



my modified upper intake... you can see how this will work

a lot of prep work ahead... i will keep you posted as i make progress... slow progress lol
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Old 03-13-2012, 06:54 PM   #2
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Please hurry up and get this finished so I can copy you.
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Old 03-13-2012, 07:37 PM   #3
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How did you do it last time -- did you have to separate it into 2?

Very nice lining it up did you know it would be that close?
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Old 03-13-2012, 10:14 PM   #4
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Quote:
Originally Posted by cormier View Post
How did you do it last time -- did you have to separate it into 2?

Very nice lining it up did you know it would be that close?
last time was pretty funny what i did... http://www.maxbimmer.com/forums/showthread.php?t=145203


i thought it would be a lot worse... from the specs that i could find online for the 00-03 itb said 80mm center to center... i assumed the same for these 07 750 itbs.. but these are about 72mm center to center... believe me this will make things a lot easier!
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Old 03-13-2012, 10:44 PM   #5
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Lol very ... custom :p I love it! I remember you talking about that at a meet but i hadnt seen those pix until now

This one should be a bit easier on you for sure :p
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Old 03-19-2012, 07:11 PM   #6
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.....update....

so i spent a little time on the itbs today after work. so i removed the vac lines, the injectors, and the secondary butterflies that were controled via electric motor.

i was able to separate them and this is how they line up.....





it looks like i can just get some silicone tube and mount them just like that.. but im going to look for some aluminum tube with a 45deg to weld to the manifold so the itbs will sit like this but lower and closer to the lower intake manifold...





now since there is quite a gap between the 2 units im going to make make a bracket to keep them spaced correctly. also you will see that i will have to fab an extention between the 2 units so the butterflies will be as one again.





well thats all for now...

next im going to take some measurements.. find some pipe... make that plate.. and jb weld all the exposed holes.
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Old 03-19-2012, 08:16 PM   #7
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Old 03-19-2012, 10:51 PM   #8
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Nice to see you making v 2.0!
You inspired me to do ITBs, i read your thread about v 1.0 build up so many times.

I will be however, using BMW k1200rs TBs. They are 38mm...as somewhere the Internet made me to believe the m42 intake tube diameter were 38mm as well....not a big deal.

I will continue working on my setup after the end of this semester.
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Old 03-20-2012, 05:57 AM   #9
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Nice to see you making v 2.0!
You inspired me to do ITBs, i read your thread about v 1.0 build up so many times.

I will be however, using BMW k1200rs TBs. They are 38mm...as somewhere the Internet made me to believe the m42 intake tube diameter were 38mm as well....not a big deal.

I will continue working on my setup after the end of this semester.
You are 100% right about those numbers. I was going to use the k1200. But i have some additional plans for the motor and the bigger opening will help.

Good luck on your build! If you have any questions feel free to ask. There were a lot of little things that i didnt post during that build
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Old 03-21-2012, 09:04 AM   #10
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Originally Posted by BMe30 View Post
You are 100% right about those numbers. I was going to use the k1200. But i have some additional plans for the motor and the bigger opening will help.

Good luck on your build! If you have any questions feel free to ask. There were a lot of little things that i didnt post during that build
thanks,

i will have questions about vac lines hook up, but I will ask them during my build in a month or so.
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Old 03-21-2012, 09:30 AM   #11
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You should of got the throttle bodies you recommended to me. Then you could get perfect spacing...

For everyone's reference this is a great DIY on how to do an ITB conversion
http://www.carforums.co.za/viewtopic.php?f=3&t=7713

Looking forward to hearing your car rip at auto-x this year Bruno!
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Old 03-21-2012, 10:25 AM   #12
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Quote:
Originally Posted by Bullet Ride View Post
You should of got the throttle bodies you recommended to me. Then you could get perfect spacing...

For everyone's reference this is a great DIY on how to do an ITB conversion
http://www.carforums.co.za/viewtopic.php?f=3&t=7713

Looking forward to hearing your car rip at auto-x this year Bruno!
I've seen that thread and also looked at this one http://www.everettmail.co.uk/mods/mo...e_bodies_2.htm

With my build i wanted to keep my stock lower intake manifold with injectors. The m42 lower intake manifold isnt as easy to shorten to the point of equal spacing and still keep the same mounting points for the fuel injectors. Even if i wanted to use the injectors from the bike itbs i would have to customize the fuel rail there too. I didnt want to go to the point of a custom manifold and fuel rail. I wanted to make this as simple as possible. Besides... the length that this will have will benifit my torque curve as seen in http://forums.neons.org/viewtopic.php?t=294784

At the end of the day its still itb
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Old 03-22-2012, 10:58 PM   #13
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I just came across this...





http://www.compsystems.com.au/catalo....html?vmcchk=1

However I will build mine for a fraction of that that costs.
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Old 03-23-2012, 06:30 AM   #14
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Very nice! The price is just about the same as these for the m42



Diy most of the time will always be for a fraction of the cost when it comes to this type of build. Motorcycle itbs are pretty cheap on ebay. Adapting them to your motor... Still a good deal. Where the costs come high is tuning. If you want open stacks you need a stand alone. But i know you already knew that.... That last bit was for those who may have not known
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Old 03-23-2012, 08:20 AM   #15
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Even then it's not too expensive to go stand alone these days. You can buy a megasquirt PNP unit with basemaps pre-loaded now for $800 (for the M20). That's pretty killer for a turn key solution. And if you're more industrious you can always build your own unit for about half of that.

But I know you already knew that.... That last bit was for those who may have not known

Luckily for you you only have 4 cylinders (if you can call that being lucky? ) I'll have to buy 2 sets of 4 just to get 6 unless I can find a parallel twin that uses separable throttle bodies.
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