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

Douglas Quebbeman wrote: 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. 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(a)mainecoon.com http://www.mainecoon.com PGP fingerprint: 4E99 10B6 7253 B048 6685 6CBC 55E1 20A3 108D AB97