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> My turn at motorcycle Throttle bodies, making progress
Phoenix-MN
post May 10 2013, 08:14 PM
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QUOTE(kevin311 @ May 10 2013, 05:07 PM) *

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



Mine are going on a 2.5L six and I'm using a Holley HP EFI ecu with crank fired ignition. The throat size on the GSX R600's is 38mm. My carbs are currently using 32mm venturies so 38's should be in the ball park.
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Mark Henry
post May 10 2013, 08:18 PM
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QUOTE(Elliot Cannon @ May 10 2013, 09:09 PM) *

What will be used to trigger the injectors?


I already have the SDS-4F system, I ran it single TB modified D-jet plenum for several years in my 914. this time it's a much bigger engine and the upright conversion for the bug.

I'm leaning towards milling it in and match porting as much as possible, I don't care for the adaptors much.
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rick 918-S
post May 10 2013, 08:37 PM
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Hey nice rack! -Celette
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QUOTE(Mark Henry @ May 10 2013, 09:18 PM) *

QUOTE(Elliot Cannon @ May 10 2013, 09:09 PM) *

What will be used to trigger the injectors?


I already have the SDS-4F system, I ran it single TB modified D-jet plenum for several years in my 914. this time it's a much bigger engine and the upright conversion for the bug.

I'm leaning towards milling it in and match porting as much as possible, I don't care for the adaptors much.


The rubber connector on my set have the depression to match the TB. Also the exiting side to the engine is a slight oval likely designed to help with reversion at the head.
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McMark
post May 10 2013, 09:29 PM
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Just got a sextet of ITBs for my new 2.4 engine. I'm thinking about welding adapters so they bolt directly onto the heads.
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Mark Henry
post May 11 2013, 06:04 AM
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QUOTE(McMark @ May 10 2013, 11:29 PM) *

Just got a sextet of ITBs for my new 2.4 engine. I'm thinking about welding adapters so they bolt directly onto the heads.


Wouldn't the TB's warp? and would you real need to do this?

One thing I notice is although there's meat at the flange the TB castings are very thin.
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crash914
post May 11 2013, 08:00 AM
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Just get Evil to weld you up some manifolds like he did for his bus....
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rick 918-S
post May 11 2013, 08:04 AM
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Cast aluminum sometimes is tricky to weld. I've had issues with it kind of bleeding contamination. I've had to stop and clean the parts as I go. Otherwise I think if the flange isn't too thick Mark could weld the TB's to a flange or shortened intake. I would try to make the welds tiny. If you were in doubt You could always weld the inside seam also.
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McMark
post May 11 2013, 10:24 AM
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Came to my senses a little bit. Ordered one of the stock plastic/rubber boots to try. If these work, I'll just use them instead. Welded on flanges would be cool, but the cost to produce the pieces I need (custom) and then the effort to weld them on is more than is really worth it unless I have no other option.

Warping may be an issue, but for $25 for three throttle bodies, I'd be willing to try it. (IMG:style_emoticons/default/wink.gif)
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r_towle
post May 11 2013, 07:28 PM
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I love the title of the thread.....just cause its so true.

I would love to see one of these project done to completion.

Rich
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JamesM
post May 12 2013, 09:01 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 (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)



How come no one ever brings up the CB Performance TBs, looks like they are making the 40s again.

http://www.cbperformance.com/ProductDetail...roductCode=7097

Sure used bike TBs are still cheaper but the CB setup is still pretty cheap, and when you consder the time it takes to hack together the bike TBs just to wind up with what is still a hacked together solution it does not add up. For $500 bucks the CB parts bolt on, my time is worth more then that.

Of course if you are doing it for the fun of the build, then it is a different story.
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McMark
post May 12 2013, 10:02 AM
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Sorry if we've totally (IMG:style_emoticons/default/hijacked.gif) you Mark.

Pic of my TBs.


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stugray
post May 12 2013, 12:00 PM
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QUOTE
What did the TBs come off of? I have pondered this for my TR6.


98, 99 Suzuki GSXR 750.

http://www.ebay.com/itm/98-99-suzuki-gsxr7...y-/110850134032
~$180 Google IS your friend.

And it looks like only one of the four has the TPS.
Will you put one of the TPS on each side, or depend on the linkage to keep them synched?

Stu
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sixnotfour
post May 12 2013, 12:50 PM
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QUOTE(McMark @ May 12 2013, 09:02 AM) *

Sorry if we've totally (IMG:style_emoticons/default/hijacked.gif) you Mark.

Pic of my TBs.


Mcmark, I have the same ones, get to it x2=$$
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Mark Henry
post May 12 2013, 04:12 PM
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QUOTE(McMark @ May 12 2013, 12:02 PM) *

Sorry if we've totally (IMG:style_emoticons/default/hijacked.gif) you Mark.

Pic of my TBs.


It's OK (IMG:style_emoticons/default/smile.gif)

I thought about do this on my 914/6 conversion as well, But I already have the Webers
I would have used Triumph TB's , what ones are those?
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McMark
post May 12 2013, 08:50 PM
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Polaris 650 TBs. I'm reconsidering since they're 46mm, which is huge for a 2.4. But I might just strive ahead and if they're too big just sell the setup to a 3.2 owner.
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Mark Henry
post May 15 2013, 02:31 PM
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I didn't like the funky shape on the bottom of the TB so I did some profiling today. (IMG:style_emoticons/default/smile.gif)

Original shape is top right TB.


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Eric_Shea
post May 15 2013, 02:34 PM
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Beginning to be as bad as Dr Evil


Send those to Evil... he can weld them up for ya! (IMG:style_emoticons/default/w00t.gif)
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Dr Evil
post May 15 2013, 07:48 PM
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QUOTE(Eric_Shea @ May 15 2013, 04:34 PM) *

QUOTE
Beginning to be as bad as Dr Evil


Send those to Evil... he can weld them up for ya! (IMG:style_emoticons/default/w00t.gif)

Nope, I am out of argon........prick. (IMG:style_emoticons/default/dry.gif)
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MDG
post May 16 2013, 08:50 AM
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QUOTE(Eric_Shea @ May 15 2013, 04:34 PM) *

QUOTE
Beginning to be as bad as Dr Evil


Send those to Evil... he can weld them up for ya! (IMG:style_emoticons/default/w00t.gif)


(IMG:style_emoticons/default/mellow.gif)

(IMG:style_emoticons/default/w00t.gif)


(IMG:style_emoticons/default/lol-2.gif) (IMG:style_emoticons/default/av-943.gif) (IMG:style_emoticons/default/av-943.gif) (IMG:style_emoticons/default/lol-2.gif) (IMG:style_emoticons/default/lol-2.gif) (IMG:style_emoticons/default/av-943.gif)
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Mark Henry
post Nov 21 2013, 07:38 PM
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I was making good progress, but work got in the way. Now I'm hoping to have both my bug and 914/6 project done for the spring. But I do have several jobs for others that have to be done as well.

This is my progress on my ITB project. this was originally for my 914 but now it's going in my 67 bug.


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