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Jeff ,thanks for the reply. Wich type of reed did you use (from wich bike)? I figured as the 2 strokes has a lower fill rate ,and has "wet" flow through the reed valve, and uses 1 reed per cylinder wich means it will have a tougher job of supporting the gas needs than on my 4 cylinder engine with a more constant suction, that the reed will support considerably higher hp figures in My configuration than what´s it is intended to. Did you use the "stock" reed flaps? Christer Jeffrey K. Churchill skrev: > 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 > ************************************************************************* > ***** > 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 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) > > > > > >