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Re: [turbobike] Carb Question

Jeffrey K. Churchill (jcperformance@juno.com)
Mon, 22 Nov 1999 20:53:20 -0500

Yes Christer,
    I first tried it on the early Zx-11  airbox's  that had insufficient
airflow.  I did noticeable
increase throttle response.

Jeff Churchill

J.C. Performance    617-06 Bicycle Path   Pt Jeff Sta  NY  11776   USA
techline: 631-928-9863    Fax:  631 928-6679
website:   www.jcperformance.com
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On Mon, 22 Nov 1999 22:38:19 +0100 Christer Johansson
<christer.johansson@mbox383.swipnet.se> writes:
> Yes it is insignificant, just have a look at the draw through kits 
> ,like
> Mr turbo, almost no plenum and no pipes ,intercooler.
> But in normally aspirated mode , this is a restriction, hence the
> priority breather valve. B.t.w Im working on My own version
> of the priority valve , Im using a 2 stroke reed valve, has anybody
> tried this before?
> 
> Christer
> 
> shammar@nsk-corp.com skrev:
> 
> > Don't worry: we like counter-discussion.  That's the point of this 
> forum.  I do
> > think that Abraham is onto something.  I believe that the amount 
> of time it will
> > take to fill the plenum will be insignificant.
> >
> > Bryan <bgoodwin@iquest.net> on 11/22/99 12:26:04 PM
> >
> > To:   Bob Shammas/EQA/Nsk-Corp@Nsk-Corp
> > cc:   FFDennis@aol.com, turbobike@natvideo.com
> > Fax to:
> > Subject:  Re: [turbobike] Carb Question
> >
> > Bob, I realilze that boost response and timing is primarily 
> controlled by
> > the turbine sizing. However, that assuming all else equal. Given a 
> fixed
> > A/R on the turbine, increasing the size of the plenum volume will 
> increase
> > the time it takes to fill it. What I'm not sure of is how dramatic 
> an
> > effect this will have.
> >
> > P.S. Not trying to argue, just making friendly counter-discussion. 
> :)
> >
> > At 07:49 AM 11/22/99 -0500, shammar@nsk-corp.com wrote:
> > >
> > >Realistically you'll never get too much plenum volume.  The need 
> for plenum
> > >volume is all but forgotten on four cylinder engines since the 
> intake
> > events of
> > >the cylinders provide an almost uninteruppted flow out of the 
> compressor.
> > >However, a larger accumulator volume reduces manifold pressure 
> fluctuations
> > >between intake events.  On a twin, you'll run into surge much 
> more easily and
> > >must have a huge plenum.  Having a large plenum is akin to being 
> able to
> > blow up
> > >a balloon with full lungs the whole time.  You don't want empty 
> lungs
> > before the
> > >intake valve event has finished.
> > >
> > >Turbine response (how fast it makes boost) will be governed by 
> the exhaust
> > event
> > >and turbocharger matching.
> > >
> > >That's just my $0.02.  I've built a few bikes but that doesn't 
> mean anything
> > >either.
> > >
> > >Bob
> > >
> > >
> > >
> > >
> > >
> > >
> > >Bryan <bgoodwin@iquest.net> on 11/21/99 01:37:26 PM
> > >
> > >To:   FFDennis@aol.com, turbobike@natvideo.com
> > >cc:    (bcc: Bob Shammas/EQA/Nsk-Corp)
> > >Fax to:
> > >Subject:  Re: [turbobike] Carb Question
> > >
> > >
> > >
> > >I think the only problem you would run into there is that the 
> volume of the
> > >airbox would be too large. This might cause the turbo to boost 
> later.
> > >
> > >
> > >
> > >
> > >At 10:38 AM 11/21/99 EST, FFDennis@aol.com wrote:
> > >>In a message dated 11/19/1999 23:56:32 Central Standard Time, 
> ABNZX9@aol.com
> > >>writes:
> > >>
> > >><< Now for another question how about intake plenum and 
> attaching it to CV
> > >> carbs?  Should I buy a set of velocity stack and machine them 
> in order to
> > >>fit
> > >> an intake plenum to the carbs that way?   I have a feeling that 
> the intake
> > >> plenum I am currently using is robbing me of effieciency.
> > >>  >>
> > >>
> > >>You raise another interesting possibility.....If you can 
> encapsulate the
> > >>entire carburetor within a plenum, and then pressurize the 
> entire plenum,
> > >you
> > >>eliminate the need for separate pressurization lines for bowl 
> vents, CV
> > >slide
> > >>vents, etc., as you would have equal pressure operating on all 
> sides of the
> > >>crab.  The pressure in the venturi would be lower than the other 
> areas,
> > >which
> > >>is how a carb works.  Your next problem is then to seal the 
> throttle cables
> > >>and fuel lines where they pass into the plenum.  I've seen ram 
> air setups
> > >>like this.  It seems to me that a turbo plenum could get away 
> with being
> > >less
> > >>aerodynamic internally due to the mechanical pressurization.
> > >>
> > >>Just my .02.........lots of book knowledge and reading, I've 
> never built a
> > >>turbo bike (but I have a KZ 900 motor in pieces, bead blasted, 
> for a future
> > >>project......)
> > >>
> > >>Dennis
> > >>'99 M2 Cyclone
> > >>'87 KLR 650 Urban Assault Vehicle
> > >>'78 KZ900 bike in boxes
> > >>
> > >>
> > >bgoodwin@iquest.net
> > >FZR1000 turbo EFI
> > >(aka The Money Pit)
> > >
> > >
> > >
> > >
> > >
> > >
> > bgoodwin@iquest.net
> > FZR1000 turbo EFI
> > (aka The Money Pit)
> 
> 
>