K-Jet /PIC hybrid

James Montebello jamesm at lapuwali.com
Mon Apr 23 17:56:41 GMT 2001


Only KE-Jet has the mixture adjustment.  Plain K-Jet used a mechanical
box using manifold vacuum to operate a diaphram to adjust mixture,
and a bimetallic strip to vary mixture based on engine temperature.

I'm certainly very interested in what the original poster uses to actuate
the plunger in the fuel distributor.  I glanced at this years ago, and
came away uncertain that I could build a servo-based mechanism that could
be fast and accurate enough.  I never considered the airflow sensor to be
all that "wacky".  It was a very nice design for what it did, and it was
used very successfully on some very powerful engines (Porsche 930 Turbo,
Ferrari 308GTBi), and operated very simply and reliably.  It's primary
failing was a high sensitivity to cam overlap, requiring you to get
power with displacement rather than extreme cam timing and revs.

james montebello

On Mon, 23 Apr 2001,  Brian Michalk wrote:

> How are you planning to actuate fuel flow?  The K-Jet has a mechanical 
> fuel distributor with an electrical mixture adjustment.
> 
> > -----Original Message-----
> > From: owner-diy_efi at diy-efi.org [mailto:owner-diy_efi at diy-efi.org]On
> > Behalf Of The Punisher
> > Sent: Sunday, April 22, 2001 10:42 PM
> > To: diy_efi at lists.diy-efi.org
> > Subject: K-Jet /PIC hybrid
> > 
> > 
> > anybody know anything about the flow rates of K-jetronic injectors? The 
> > VW/audi/volvo 4-5 cylinder systems, NOT the V8 versions.
> > Just doing a little thinking about a REAL simple 8-bit micro controlled 
> > constant flow system with inexpensive oem parts (K-jet's are 
> > plentifull at 
> > the wrecking yard).
> > And before I get replies about how bad they suck, I was only 
> > thinking about 
> > the injectors and lines, not the wacky airflow sensor. airflow 
> > sensing would 
> > be basic speed density/n-alpha combo for realy wild cams.
> > Any k-jet injector info would help me determine if its workable.
> > 
> > Thanks.
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