2 stroke injection

[jb24 at chrysler.com]

Actually, the Bimota Vdue was a pig because of poor process control.
Basically their cylinder manufacturer wasn't keeping a close eye on the
transfer port location and turned a road-race motor into a lawn-tractor.

Honda has several papers published on EFI on two-strokes.  Big thing to
remember is influence of pipe tuning on VE.  Which is why they had
cylinder pressure transducers hooked into the ECU, instead of a simple
speed-density.  Other thing is misfire detection, cause misfire causes
pipe tuning (temperature) to change instantly and the ECU needs to lean
out or the cylinder dies of way-too-rich.  A MAF can do it, but you
need one MAF per cylinder.  Anyhow, carbs do the same job for a whole
lot less complexity.
---------------------- Forwarded by John R Bucknell/JTE/Chrysler on
05/12/98 03:50 PM ---------------------------

        owner-diy_efi @ efi332.eng.ohio-state.edu
        05/12/98 12:02 PM
Please respond to diy_efi at efi332.eng.ohio-state.edu @ SMTP
To: diy_efi @ efi332.eng.ohio-state.edu @ SMTP
cc:
Subject: Re: 2 stroke injection

If you want to try 2-stroke injection, check out the Bimota Duo
(http://www.sepnet.com/cycle/misc.htm#Bimota is a place to start), a
fuel
injected 500cc twin bike.  It was designed as a Grand Prix engine but it
never made the power to compete with the V4's. Bimota tried to recoup
the
cost of development by turning it into a road bike but the emission
controls made it into a pig.  Looks nice though.
gus


At 07:47 12/05/98 -0400, gary wrote:
>No 2 stroke but I have done lots of work with Bosch mechanical fuel
>injection years ago.  These units inject over a fairly small crank
angle.  I
>would be concerned about proper lubrication or some uncontrolled strati
fied
>charge with only a timed injector pulse(lots of air with a slug of fuel
>swirling around).  Injector pulse proportional to throttle would
create some
>problems as the VE curve has some great peaks and valleys.  Just my 2
cents.
>
>Gary Derian <gderian at cybergate.net>
>
>>Anybody ever tried mechanical injection, like a diesel pump, on a 2
>>stroke gas engine?Figure the oil in the mix would handle lubrication
OK
>>- but would it work? Not talking direct injection, just port, timed
>>injection on a V4 Evinrude.Pressure reduced from doozle pressure, and
>>injection volume determined strictly by throttle opening, with
possible
>>manual mixture control.
>>                    Reply to Clare at snyder.on.ca
>
>
>
>