Fuel injection (was RE: Collections vs. accumulations, was Re: How many collectors?)

From: Chris Kennedy <chris_at_mainecoon.com>
Date: Mon Aug 6 16:16:09 2001

Douglas Quebbeman wrote:

> Had Bosch come up with EFI already by 1968?

Yeah, D-Jetronic. Basically a solid-state version of the
Vacuum-tube EFI demonstrated by some Bendix engineers in the '50s --
in fact the Bosch electromechanical injectors are based on
the Bendix patents they purchased, and I wouldn't be
surprised if that is also true for the incredibly clever MAP
sensor that made it all go (Bendix exec's didn't see
why anyone would want such a thing are were happy to be rid
of the technology). D-Jetronic first showed up in 1968 on
the VW type III.

> Every VW (and Audi & MB, etc) of that vintage that I've seen used
> CIS, which was a purely mechanical system.

K-Jetronic/CIS first showed up in 1973 on the 911. The earlier
mechanical systems used by MB, BMW (on the Tii) and
Porsche on the 911RS/RST/RSR were Bosch or Kuglefischer
mechanical injection, which is _very_ different from CIS -- it's
a mechanical injection pump that provides sequential injection of
fuel based on throttle position, engine temperature and, in the Bosch
case barometric pressure. The engine map that in modern digital
systems is encoded in ROM is represented in the pumps by a 3D
cam. It's actually quite clever.

--
Chris Kennedy
chris_at_mainecoon.com
http://www.mainecoon.com
PGP fingerprint: 4E99 10B6 7253 B048 6685  6CBC 55E1 20A3 108D AB97
Received on Mon Aug 06 2001 - 16:16:09 BST

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