Converting a 1976 CIS mercedes 450sl to Megasquirt

05/11/08

Home
new holders and fitting the rail
Fuel supply
Sensors
First Start
Feedback

 

 
Hit Counter
People have
visited my page!

   
The engine: 1976 CIS (mechanical fuel injection) R107 Mercedes Megasquirt: a DIY fuel injection computer you build yourself.
Thats a 450 sl V8 developed by Bowling and Grippo, with great help forums

This particular car had a lot of fuel supply problems and we decided to convert it to megasquirt to try and get away from the mechanical injection system which is expensive to maintain in tip top condition. I decided to go with standard R107 bosch fuel injectors as they are freely available and rebuilt injectors cost about $50 each. I decided to keep most of the original air induction system just to make fitting easier. As there was no electronic control of the mechanical system everything had to be installed for sensors and the original injection system removed.

For the megasquirt I went with a standard MS 1 version 3. I used the standard control systems but built the coil trigger system to trigger the injection events. this triggers off the negative post of the coil and with electronic systems gives a very clean signal.

The first thing I did was remove the mechanical injection system but kept the air induction systems.

First I removed the injection system with the fuel distributor and the WUR

Then I removed the pump system to replace it with a lower pressure pump system which failed miserably, but more on that later.

I also had to, unexpectedly, remove all of the injection holders and replace them with djet holders. above are some pics of the original injector holders and one of the removed ones, and below one of the machined part of the head head for the new djet holders.

Also when you remove the accelerator arm to remove the #8 injector holder put the swivel ball in a better place than next to the fan motor cover as it will get lost and they cost a small fortune to get a new one (don't ask).

 

Home | new holders and fitting the rail | Fuel supply | Sensors | First Start | Feedback

This site was last updated 05/11/08