mad4x4
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| posted on 19/2/10 at 12:47 PM |
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Daft question about Bike carbs
If I take a bike carb and remove the slider and the Fuel side of the carb does it become a "thorttle body" in principle?
Surely a throttle body is a Tube with a butterfly at one end....
as per
Linky to Flea Bay
Scot's do it better in Kilts.
MK INDY's Don't Self Centre Regardless of MK Setting !
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David Jenkins
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| posted on 19/2/10 at 12:49 PM |
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You will have to fit the injectors somewhere...
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mad4x4
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| posted on 19/2/10 at 12:51 PM |
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Its a zetec head so I still have the sandwich plate for the injectors.
Scot's do it better in Kilts.
MK INDY's Don't Self Centre Regardless of MK Setting !
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blakep82
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| posted on 19/2/10 at 12:51 PM |
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if you fit injectors into your manifold, then i don't see why not.
________________________
IVA manual link http://www.businesslink.gov.uk/bdotg/action/detail?type=RESOURCES&itemId=1081997083
don't write OT on a new thread title, you're creating the topic, everything you write is very much ON topic!
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Danozeman
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| posted on 19/2/10 at 12:51 PM |
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In theory yes but you wont have a smooth body all the way through as youl have the gap where the slide goes. And as David says you will need a
manifold with injector holes.
Dan
Built the purple peril!! Let the modifications begin!!
http://www.eastangliankitcars.co.uk
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blakep82
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| posted on 19/2/10 at 12:55 PM |
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don't want to take this down the wrong way, but on a bike carb, what does the slide actually do?
________________________
IVA manual link http://www.businesslink.gov.uk/bdotg/action/detail?type=RESOURCES&itemId=1081997083
don't write OT on a new thread title, you're creating the topic, everything you write is very much ON topic!
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cd.thomson
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| posted on 19/2/10 at 01:02 PM |
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like this but the slide is generally operated by the engine vacuum in our carbs with the throttle cable controlling the vacuum via the butterflies.
[Edited on 19/2/10 by cd.thomson]
Craig
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big-vee-twin
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| posted on 19/2/10 at 01:09 PM |
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You can mount the bodies onto a ST170 manifold like this and use the injector pockets in the manifold.
.jpg)
Duratec Engine is fitted, MS2 Extra V3 is assembled and tested, engine running, car now built. IVA passed 26/02/2016
http://www.triangleltd.com
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r1_pete
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| posted on 19/2/10 at 01:09 PM |
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The slide controls the effective venturi size to maximise air velocity across the rev range, i.e.
low revs, small venturi = high gas speed
As revs rise the decrease in pressure in the manifold, allows air pressure under the diaphragm to lift the slide and allow more air in. The drilling
to the engine side of the diaphragm seal is connects to the venturi, hence at manifold pressure, the holes at the inlet side of the carb are to keep
the underside of the diaphragm at atmosphere.
Stripped carbs have been used as TB's before though, so perfectly possible.
[Edited on 19/2/10 by r1_pete]
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whitestu
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| posted on 19/2/10 at 02:03 PM |
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quote:
If I take a bike carb and remove the slider and the Fuel side of the carb does it become a "thorttle body" in principle?
That's what I'll be doing if I ever go EFI. I've already re-spaced a set of ZX6 carbs and have modified a Mondeo plastic manifold,
complete with injectors, to bolt them to.
Stu
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Danozeman
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| posted on 19/2/10 at 05:49 PM |
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why not just buy these?
linky
perfect for the job.
Dan
Built the purple peril!! Let the modifications begin!!
http://www.eastangliankitcars.co.uk
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blakep82
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| posted on 19/2/10 at 06:59 PM |
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quote:
Originally posted by r1_pete
The slide controls the effective venturi size to maximise air velocity across the rev range, i.e.
low revs, small venturi = high gas speed
As revs rise the decrease in pressure in the manifold, allows air pressure under the diaphragm to lift the slide and allow more air in. The drilling
to the engine side of the diaphragm seal is connects to the venturi, hence at manifold pressure, the holes at the inlet side of the carb are to keep
the underside of the diaphragm at atmosphere.
Stripped carbs have been used as TB's before though, so perfectly possible.
wow, who had the imagination to come up with that?! 
________________________
IVA manual link http://www.businesslink.gov.uk/bdotg/action/detail?type=RESOURCES&itemId=1081997083
don't write OT on a new thread title, you're creating the topic, everything you write is very much ON topic!
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mad4x4
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| posted on 23/2/10 at 12:53 PM |
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Ok first attempt will be to convert the Bike carbs into throttle bodies. I won;t remove the slider but lock it UP to give a smoother body... and
plug some of the wholes......
Scot's do it better in Kilts.
MK INDY's Don't Self Centre Regardless of MK Setting !
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mad4x4
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| posted on 23/2/10 at 12:55 PM |
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Alternately what about leaving the the Slide active to the effective venturi size to maximise air velocity across the rev range... so EFI with
variable Venturi.....
Scot's do it better in Kilts.
MK INDY's Don't Self Centre Regardless of MK Setting !
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sebastiaan
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| posted on 23/2/10 at 04:19 PM |
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Yes! that is exactly what you should try to do. The 5PW (i think..) R1 uses exactly this setup, CV throttle bodies.
It should help better atomize the fuel and burn speed (by having a more homogeneous mixture), minimizing ignition advance needed for maximum torque at
lower revs.
Could you post a picture of the inside of the carbs with throttle plate and slide held open so we can have some idea of what still protrudes into the
airstream?
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