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> My turn at motorcycle Throttle bodies, making progress
Mark Henry
post May 10 2013, 10:57 AM
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Like I need another project... Beginning to be as bad as Dr Evil (IMG:style_emoticons/default/laugh.gif) ... (IMG:style_emoticons/default/huh.gif) ... (IMG:style_emoticons/default/unsure.gif)

I need some TB's for my 914/4 type 4 into bug project engine.
Jenvey, Extrudabody and TWM TB's are crazy frickin' expensive for what they are, so I'm going the Motorcycle TB route.

This is what came in the mail today, stuff looks real good (IMG:style_emoticons/default/piratenanner.gif)


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Mark Henry
post May 10 2013, 11:01 AM
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Damn... you think they would get the spacing correct (IMG:style_emoticons/default/mad.gif)

80mm center to center spacing..... (IMG:style_emoticons/default/sad.gif) I need 90mm....


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Mark Henry
post May 10 2013, 11:07 AM
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The bike injectors are shorter and I don't know if the fuel rails have enough meat to be cut an tapped for pipe threads.

The seals area bit different as well but think it's workable.

The bike injectors are only 22lbs the black injectors are 50lbs


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Mark Henry
post May 10 2013, 11:09 AM
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Take them all apart and i have 4 separate ITB's (IMG:style_emoticons/default/shades.gif)


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Mark Henry
post May 10 2013, 11:13 AM
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Going to take a bit of (IMG:style_emoticons/default/smash.gif) but I'm thinking these are going to work out beauty. (IMG:style_emoticons/default/smile.gif)


.


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Mark Henry
post May 10 2013, 11:24 AM
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Going to take me a little bit to get going on this, my 914 is also getting a 3.0 /6 at the same time, so I'm bleeding money....but I try to update as do.

Debating on should I make adaptors or just machine the CB manifolds and JB weld the TB's in place. The JB weld method would save a lot of fab time.
I also should match port the funky bottoms on those TB's.
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SirAndy
post May 10 2013, 11:35 AM
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QUOTE(Mark Henry @ May 10 2013, 10:24 AM) *
Debating on

You should get a set of these:

(IMG:http://www.914world.com/bbs2/uploads/post-11-1124689756.jpg)



That way, you can run the big injectors where they should be, close to the intake valve, and use the TBs to regulate the air.

(IMG:style_emoticons/default/shades.gif)
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Mark Henry
post May 10 2013, 11:41 AM
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QUOTE(SirAndy @ May 10 2013, 01:35 PM) *

QUOTE(Mark Henry @ May 10 2013, 10:24 AM) *
Debating on

You should get a set of these:

(IMG:http://www.914world.com/bbs2/uploads/post-11-1124689756.jpg)



That way, you can run the big injectors where they should be, close to the intake valve, and use the TBs to regulate the air.

(IMG:style_emoticons/default/shades.gif)


You want to sell those? (IMG:style_emoticons/default/biggrin.gif)

Maybe... I will but for now I think I'll just take the simple route.
I'm trying to shake off the DWD and get my projects done. I can fine tune the details each winter after that.

(IMG:style_emoticons/default/smile.gif)
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worn
post May 10 2013, 11:43 AM
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QUOTE(Mark Henry @ May 10 2013, 08:57 AM) *

Like I need another project... Beginning to be as bad as Dr Evil


What did the TBs come off of? I have pondered this for my TR6.
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Randal
post May 10 2013, 12:18 PM
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Mike Mueller was messing with bike TB's years ago. He went through the whole process which can be see on the link below. I, on the other hand I ended up going the TWM route as their TB fit a Weber type manifold and I had way to many "projects" on my engine.

You can probably contact Mike somewhere on this site or the club site.

OK found the link: http://www.914world.com/bbs2/index.php?sho...torcycle+TB%27s
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Mark Henry
post May 10 2013, 12:27 PM
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QUOTE(worn @ May 10 2013, 01:43 PM) *

QUOTE(Mark Henry @ May 10 2013, 08:57 AM) *

Like I need another project... Beginning to be as bad as Dr Evil


What did the TBs come off of? I have pondered this for my TR6.


Well I have at least 40hrs and this is my 3rd set of TB's into the research on this, so I'm not going to tell you what exact make and model.
Google is your friend and the truth is out there.

Looking like I might also build a few sets this winter to sell ...maybe...if I don't I'll tell all...sneak peek (IMG:style_emoticons/default/smile.gif)


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Dr Evil
post May 10 2013, 02:32 PM
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This is a project I want to do in the future as well (IMG:style_emoticons/default/biggrin.gif)
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bulitt
post May 10 2013, 02:44 PM
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QUOTE(Mark Henry @ May 10 2013, 01:24 PM) *

Going to take me a little bit to get going on this, my 914 is also getting a 3.0 /6 at the same time, so I'm bleeding money....but I try to update as do.

Debating on should I make adaptors or just machine the CB manifolds and JB weld the TB's in place. The JB weld method would save a lot of fab time.
I also should match port the funky bottoms on those TB's.


Maybe you should just bore the manifolds so the TB recess in the bores, then drill and tap for two hold down screws/tabs for each TB. Looks like there is a recess for o-ring around base of each TB ?
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Dr Evil
post May 10 2013, 02:47 PM
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Or mill of the flange of the manifolds and use a rubber coupler like the bikes do (IMG:style_emoticons/default/smile.gif)
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Phoenix-MN
post May 10 2013, 03:53 PM
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QUOTE(Dr Evil @ May 10 2013, 12:47 PM) *

Or mill of the flange of the manifolds and use a rubber coupler like the bikes do (IMG:style_emoticons/default/smile.gif)


Boy, EFI ITB's is like a sickness. I started my project for my "Tail Dragger" a month or so ago with Suzuki GSX R600 ITB's. Lot's of threads on the Bird Board. I used the stock rubber couplers and redrilled the mounting holes on the manifolds.

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rick 918-S
post May 10 2013, 05:05 PM
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Lots of chatter about ITB's. I'm researching a fuel management that you can apply instead of building on from scratch. I'm hoping to find something to tweek. Why reinvent the wheel. Lots of cars and bikes are running injection. Just take something that the OEM developed and is currently in use and tune it.

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Randal
post May 10 2013, 05:06 PM
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QUOTE(Dr Evil @ May 10 2013, 01:47 PM) *

Or mill of the flange of the manifolds and use a rubber coupler like the bikes do (IMG:style_emoticons/default/smile.gif)


Mike Mueller actually did this. Check out the link in my post.
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kevin311
post May 10 2013, 07:07 PM
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What size engine are these going on? What are the throat sizes on them? What are you using to control them?
I'm doing something similar with VFR800 ITBs.
I really like how those come apart. The VFRs are 2 two-barrel castings.
I'll be following this one. (IMG:style_emoticons/default/aktion035.gif)



1.7 with VFR800 tbs (work in progress)
http://www.914world.com/bbs2/index.php?showtopic=192548
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Elliot Cannon
post May 10 2013, 07:09 PM
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What will be used to trigger the injectors?
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Mike Bellis
post May 10 2013, 07:21 PM
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You need some of these...

(IMG:http://www.914world.com/bbs2/uploads_offsite/e.ridersdiscount.com-10496-1368235292.1.jpg)

http://www.ebay.com/itm/Bikers-Choice-2-Bo...ies&vxp=mtr
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