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> New project:Adapting motorcycle Throttle Bodies, this should be "interesting" :)
Mueller
post Jan 21 2005, 01:53 PM
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The cost of aftermarket throttle bodies is way up there, the bottom of scale we have the CB Performance units which are about $250 each and the rest are easily 2X that about.....

so I swung by the motorcycle salvage yard in Fremont today and picked up these beauties (IMG:http://www.914world.com/bbs2/html/emoticons/smile.gif)

45mm at the butterfly....they taper down to 42.5mm at the bottom...

includes a nice TPS and injectors...I doubt the injectors flow enough, but who knows, I'll find out once I get the specs....

no idea of what bike they came off of yet.....price was $125

top view:


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Mueller
post Jan 21 2005, 01:53 PM
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and a view of the bottom of the assembly:


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rick 918-S
post Jan 21 2005, 01:55 PM
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Hey nice rack! -Celette
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Dude! (IMG:http://www.914world.com/bbs2/html/emoticons/aktion035.gif) BTW that second picture looks like sir andy took it. (IMG:http://www.914world.com/bbs2/html/emoticons/happy11.gif)
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Mueller
post Jan 21 2005, 01:58 PM
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QUOTE(rick 918-S)
Dude! (IMG:style_emoticons/default/aktion035.gif) BTW that second picture looks like sir andy took it. (IMG:style_emoticons/default/happy11.gif)

i had to hurry up and take the picture, I heard our CEO walking down the hallway (IMG:style_emoticons/default/smile.gif)
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rick 918-S
post Jan 21 2005, 02:00 PM
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Hey nice rack! -Celette
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QUOTE (Mueller @ Jan 21 2005, 11:58 AM)
QUOTE (rick 918-S @ Jan 21 2005, 12:55 PM)
Dude!  :headbanger:  BTW that second picture looks like sir andy took it. (IMG:http://www.914world.com/bbs2/html/emoticons/happy11.gif)

i had to hurry up and take the picture, I heard our CEO walking down the hallway (IMG:http://www.914world.com/bbs2/html/emoticons/smile.gif)

(IMG:http://www.914world.com/bbs2/html/emoticons/ohmy.gif) That's funny! (IMG:http://www.914world.com/bbs2/html/emoticons/lol2.gif)
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Mueller
post Jan 21 2005, 02:34 PM
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it's lunch time now, no need to hide my projects (IMG:http://www.914world.com/bbs2/html/emoticons/smile.gif)

wow, the new throttle bodies sure come close to matching the centerline of the manifolds.......

centerline to centerline measurements:

Top of manifold = 90.78mm

bottom of manifold (mating surface to head) = 86.45mm

Throttle bodies = 89.85mm
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Mueller
post Jan 21 2005, 02:35 PM
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opps...here is a picture:


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DNHunt
post Jan 21 2005, 02:42 PM
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Mike

Are those grooves in the TBs for O-rings. Maybe you could cut a seat in the manifolds and seal them with an O-ring. Use the studs for some sort of clamping rig. Then maybe some selective port matching.

Dave
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Root_Werks
post Jan 21 2005, 02:54 PM
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Using bike TB's like this is a great idea really. A guy at work here is using them to put a stand along on his RX7. They are sort of universal in design. I like it and hope you get something put together! I would love to see it! (IMG:http://www.914world.com/bbs2/html/emoticons/rocking nana.gif)
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SLITS
post Jan 21 2005, 03:03 PM
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I have a TB on my 2.0 that is definitely not stock, but haven't bothered to see who or what. Maybe I'll take a pic of it and post it (It makes my car faster (IMG:http://www.914world.com/bbs2/html/emoticons/biggrin.gif) )
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lapuwali
post Jan 21 2005, 03:40 PM
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QUOTE(DNHunt)
Mike

Are those grooves in the TBs for O-rings. Maybe you could cut a seat in the manifolds and seal them with an O-ring. Use the studs for some sort of clamping rig. Then maybe some selective port matching.

Dave

Not really an O-ring (putting on my "worked on bikes for 15 years" hat). Bike intake to head manifolds are usually just rubber (or rubber-like) castings, with a lip machined into the inside to catch that groove. I haven't worked on bikes since EFI became commonplace. Those TBs look exactly like a typical set of carbs on any of a number of inline-4 bikes. There are (were) only two manufacturers of carbs on the Japanese bikes: Mikuni and Keihin. I'd be willing to bet money that one of those manufacturers made these TBs.

It would be interesting to know what the flow rate on those injectors are. I'd be willing to bet a set of injectors from a 750-1000cc bike engine would actually be adequate for a stock-ish Type IV. Figure 120-150hp for the bike engine.
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Mueller
post Jan 21 2005, 03:50 PM
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QUOTE (lapuwali @ Jan 21 2005, 02:40 PM)
QUOTE (DNHunt @ Jan 21 2005, 12:42 PM)
Mike

Are those grooves in the TBs for O-rings. Maybe you could cut a seat in the manifolds and seal them with an O-ring. Use the studs for some sort of clamping rig. Then maybe some selective port matching.

Dave

Not really an O-ring (putting on my "worked on bikes for 15 years" hat). Bike intake to head manifolds are usually just rubber (or rubber-like) castings, with a lip machined into the inside to catch that groove. I haven't worked on bikes since EFI became commonplace. Those TBs look exactly like a typical set of carbs on any of a number of inline-4 bikes. There are (were) only two manufacturers of carbs on the Japanese bikes: Mikuni and Keihin. I'd be willing to bet money that one of those manufacturers made these TBs.

It would be interesting to know what the flow rate on those injectors are. I'd be willing to bet a set of injectors from a 750-1000cc bike engine would actually be adequate for a stock-ish Type IV. Figure 120-150hp for the bike engine.

James....yep Mikuni throttle bodies.....
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Jake Raby
post Jan 21 2005, 04:05 PM
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I have done this twice! It works...

That size is perfect for the size engine you are doing..
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TravisNeff
post Jan 21 2005, 04:28 PM
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can't you also get TB's with slide valves too? woohoo!
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bondo
post Jan 21 2005, 04:43 PM
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Mueller: What are all of your projects? You seem to have quite a few... Will they all fit in one post? (IMG:http://www.914world.com/bbs2/html/emoticons/lol2.gif) (IMG:http://www.914world.com/bbs2/html/emoticons/poke.gif)
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914werke
post Jan 21 2005, 04:46 PM
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So mike are you considering breaking up the bank and appling a pair to each side (more work) or modifing runners for a central location & maintaing the linkage and single TPS?
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Stephane
post Jan 21 2005, 04:46 PM
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Those look good. What type of injection system are you gonna use with these?


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rick 918-S
post Jan 21 2005, 09:44 PM
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Hey nice rack! -Celette
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(IMG:http://www.914world.com/bbs2/html/emoticons/icon_bump.gif) I don't really have anything to say, except Cool!
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Mueller
post Jan 28 2005, 05:03 PM
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Just got back from the local cycle shop...found out my new throttle bodies came off an '02 or '03 Kawasaki Ninja ZX-12R...rated at 165 horsepower (IMG:http://www.914world.com/bbs2/html/emoticons/smile.gif)

Who knows, the fuel injectors might just work on my new motor afterall....


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rick 918-S
post Jan 28 2005, 06:32 PM
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Hey nice rack! -Celette
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You should just use the whole Ninja motor! (IMG:http://www.914world.com/bbs2/html/emoticons/happy11.gif) not!
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