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> My turn at motorcycle Throttle bodies, making progress
Mark Henry
post Nov 21 2013, 07:40 PM
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ITB without filters


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Mark Henry
post Nov 21 2013, 07:41 PM
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ITB with filters


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Mark Henry
post Nov 21 2013, 07:46 PM
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down the throat.

I am having issues with clearance of the fuel rail on the 1/2 side in the bug conversion. Most likely I'll have to cut a hole on the inner fender to clear it. then I'll have to make something to clear it.


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r_towle
post Nov 21 2013, 08:50 PM
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Flip them, put the rail in the inside
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Mark Henry
post Nov 21 2013, 09:50 PM
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QUOTE(r_towle @ Nov 21 2013, 09:50 PM) *

Flip them, put the rail in the inside

You really think I didn't try that? (IMG:style_emoticons/default/confused24.gif)
VW bug conversion...upright fan shroud in the way.

It's been almost 2 months, so I looked at this again.
Could I make it work flipping it around? Maybe, but I'd have to scrap the filter base and re-design it and then scrap the manifold or weld it up and re machine it.
It's easier to re-deign (reprofile) the rail, the only part interfering and cut an access hole. The hole would only be under the fender and I can make a cover for it.
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Dr Evil
post Nov 21 2013, 10:15 PM
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Mark, you need to place them so that air will past THROUGH them and into the engine, preferably to the intake part of the head. You can identify this by it being on top of the engine (IMG:style_emoticons/default/smile.gif) (IMG:style_emoticons/default/tongue.gif) (IMG:style_emoticons/default/poke.gif)
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Mark Henry
post Nov 21 2013, 10:20 PM
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QUOTE(Dr Evil @ Nov 21 2013, 11:15 PM) *

Mark, you need to place them so that air will past THROUGH them and into the engine, preferably to the intake part of the head. You can identify this by it being on top of the engine (IMG:style_emoticons/default/smile.gif) (IMG:style_emoticons/default/tongue.gif) (IMG:style_emoticons/default/poke.gif)



https://www.youtube.com/watch?v=Qw9oX-kZ_9k
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gereed75
post Nov 26 2013, 10:13 PM
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Mark, Have you seen this - vwmegasquirt.tk and there is a guy out there named supaninjanick with a blog who has done this on a type 4 in a notchback using CBR 600 ITB's Cool project
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Mark Henry
post Nov 27 2013, 04:32 AM
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QUOTE(gereed75 @ Nov 26 2013, 11:13 PM) *

Mark, Have you seen this - vwmegasquirt.tk and there is a guy out there named supaninjanick with a blog who has done this on a type 4 in a notchback using CBR 600 ITB's Cool project


Looks good.
I looked at using the cut off stock manifold but the bung is in the wrong place for a bug conversion, it would/could work in the type 3/4 or 914. In the bug conversion the engine surround (car bodywork) gets in the way.
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kevin311
post Nov 27 2013, 06:09 AM
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Please finish this!! For all of us that started and never finished.
My ITB project had to be sidelined so im glad there is someone else attempting it.

Good luck and keep us updated
(IMG:style_emoticons/default/beerchug.gif)
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Mark Henry
post Nov 27 2013, 09:14 AM
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I'll keep working it but it might be spring by the time it's done.

I used some scrap wood to make a stand so I can work on them a bit more hands free.


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Mark Henry
post Nov 27 2013, 09:23 AM
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I did some re-profiling on the 1/2 side fuel rail for clearance.


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r_towle
post Feb 3 2014, 07:52 PM
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Not sure how it's going....

But....

Have you considered bolting those throttle bodies directly to the head....?

What is the downside of moving the throttle plate that close to the valve?
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rick 918-S
post Feb 4 2014, 09:04 AM
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Hey nice rack! -Celette
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Ya, what about cutting down the intakes?
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914werke
post Feb 4 2014, 09:08 AM
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Question: is it better to have the injector nozzels High on the intake as with these TB's atop the intake runners or low nearer the port mouth like the OE intakes ?
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TeenerTim
post Feb 4 2014, 04:07 PM
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QUOTE(rdauenhauer @ Feb 4 2014, 10:08 AM) *

Question: is it better to have the injector nozzels High on the intake as with these TB's atop the intake runners or low nearer the port mouth like the OE intakes ?

Always better to be close to the port. The atomized fuel has less of a chance to condense into droplets. It also provides better throttle response and low end performance. Think about driving a car with a tunnel ram intake. It takes time for the air to reach a good velocity so there is a huge lag. Not a problem if you are drag racing and dumping the clutch with a wide open throttle.

Edit: This is still much better than the single plenum and long runners of the stock type 4.
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Mark Henry
post Feb 4 2014, 04:42 PM
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QUOTE(rdauenhauer @ Feb 4 2014, 10:08 AM) *

Question: is it better to have the injector nozzels High on the intake as with these TB's atop the intake runners or low nearer the port mouth like the OE intakes ?



Also depends what you are going for, maybe emissions, but really on our cars I doubt if it makes a lot of difference.

BTW also note that mine are going into a VW bug, there is absolutely no way of getting the injector closer to the stock location without cutting up the engine metal surround.
Not going to happen.
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r_towle
post Feb 6 2014, 09:22 AM
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Are you doing ITB's on the six you are building.
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Mark Henry
post Feb 6 2014, 11:17 AM
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QUOTE(r_towle @ Feb 6 2014, 10:22 AM) *

Are you doing ITB's on the six you are building.

No, at least for now, I have Webers for the /6.
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Mark Henry
post May 14 2014, 11:24 AM
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It's alive (IMG:style_emoticons/default/thumb3d.gif)


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