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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 I´m working on My own version of the priority valve , I´m 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)