Finally driving again!, Type IV CIS conversion Options

[dlee6204]

I finally got to drive my 914 again! (IMG:style_emoticons/default/mueba.gif) (IMG:style_emoticons/default/biggrin.gif) Back in June I was having fits with the L-Jet system that was on my car so I decided it was time to tackle a project I was wanting to do for some time, a CIS conversion.

I retrofitted a CIS Basic system to my stock 1.8L engine using parts from various VWs and Mercedes and today I fired it up for the first time and was able to take it for a long drive. It felt AWESOME. Smooth reliable power all the way to redline. It has a nice growl to it too. (IMG:style_emoticons/default/evilgrin.gif) I'm quite impressed. I still have to make some small adjustments but at least now I can get back to driving the car daily and the best part, NO MORE JACKSTANDS! I'm going to drive the snot out of the car this week to get the system dialed in and hopefully next weekend I will take it for a day drive in the mountains. (IMG:style_emoticons/default/driving.gif) More details and pics to come later.


The cat is happy too!

[Prospectfarms]

I'm not sure how that system would interface with an ECU:

"K-jetronic is a mechanical continuous fuel injection system which does not require any form of drive whatsoever." "K-jetronic: a fuel injection system from Bosch"

Its not simple -- rather mechanically complex, but it is modular and not electronic so in that way it might be simpler to work on:

Here's a picture of the air flow sensor that controls fuel:

Here's a diagram describing how it enriches the mix when you stomp on the gas:


I'm not qualified to comment on how a high duration camshaft might affect the operation of the sensor, but it is clear that strong pulsations in manifold air flow might. I thought that valve overlap acted to mitigate exhaust gas resonance, permitting more fuel to enter the combustion chamber? In the Bosch K-jet material they mention overlap as an important part of their performance/economy/emissions strategy.

I want to know what those who have actually worked on it (K-jet system) feel about the durability of all those the mechanical movements over 25-30 years. Are the necessary components obsolete? Are used parts reliable?

One thing I found very interesting in my research is that later K-jet usedan overlay electronic feedback loop with a lambda sensor.

Thanks to Thinair for providing the informative links.