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Christer, I'm not sure about your reference to draw through kits and the significance of airbox size. At 10:38 PM 11/22/99 +0100, Christer Johansson wrote: >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) > > > > > bgoodwin@iquest.net FZR1000 turbo EFI (aka The Money Pit)