Cheap 200 EFI

$100 EFI?

This is an adaptation of a junkyard Bosch L-jetronic and a Ford Tempo/Escort throttle body to an MG. Click on the L-Jetronic link.

The Ford TB is a two bolt affair that is a direct bolt on to a 1 bbl carb base. It has an integral fuel pressure regulator and injector. The injector is normally run on 30-35 psi, but can be operated at 50-55 psi to increase fuel flow. The air horn is held on with four screws and can be turned to whatever direction is best for your application.

You'll need to add a WOT enrichment switch and a fuel pump with a return line.

L-Jetronics were found in darn near every BMW, Renault, VW, Volvo.....almost everything European in the 80's so this stuff should be very available for next to nothing. The throttle body is a mid eighties piece.

I think this setup is going to be horespower limited, but it should be capable of handling enougyh fuel and air to make around 150 hp, or about what a good running 200 would make. Add a hot ignition system like Mike's DUI and it should be a good carburetor replacement.

Saabs are another source of L-Jet bits. Many had issues with wiring being totally stuffed from corrosion creeping back up the loom. So they left the road with little service on the motors (compared to Vollies, where people persevered to fix them and then racked up half a million km).

Why limit yourself to a Tempo TBI? It would seem that something larger could be made to work.

Interesting. I'm lookin' at building a 200 for my grandpa, and he's looking for something a little more reliable than that old holley 1940, which is on it's last leg, starting to leak and such, since he's getting older. Hmm.

ANy one know of a car with a similar size motor to ours that used
l- jetronic injection. I know some BMWs came with a 3.4. Are any of those L-jetronic?

L-jet has the plastic tubes to the injector nozzles, and a sensor in the exhaust. Easy to pick; K-jet has no sensor. If you score the parts, be very careful when tinkering; some bits are fragile and expensive to unfamiliar hands... I'd really suggest the 2.9 litre PRV (Volvo) V-6 as a donor.

Regards, Adam.

The K-Jet has the fuel distribution unit coupled to the mechanical air meter. It has the tubes that lead to the injectors. The L-jet has electronic injectors.

The K-jet's air meter can be a source of problems if it gets dirty or corroded. It's also a huge restriction in the airflow. But it is dead simple in principle and concievably could be adap[ted to other engines. The trick would be to select a unit similar in power output, not necessarily displacement.