atb

Tom M. and I are currently doing an engine swap for a local owner.
The owner purchased an '83 Euro motor complete (and then some, thanks Roger!) and we're installing it in his US spec '79.

There are two differences between the supplied plenum and the stocker from the 4.5L (both are CIS motors) , and I just want to make sure that we're not looking at any major issues. The newer plenum has an terminal block on the rear passenger side below the fuel distributor which appears to take an electric signal and then opens the metering door based upon whatever eletronic input is received. Tom analogized it as kind of like an electronic choke. The other difference is that there are two fuel lines that come together on the way to the warm up regulator. On the '79, there is just one fuel line and it goes straight to the WUR on the front of the motor. On the newer one, one line goes to what appears to be a fuel dampener, the other goes to an electic valve, and they both come together at the dampener and then a single line goes up to WUR.

It's our intent to run the single fuel line off the '79 between the fuel distributor and the WUR, and do away with the dual line/dampener/electric valve setup supplied with the newer motor.
As to the electric switch that controls the metering door, we were just going to leave it unplugged.

The '79 4.5L runs fine without these extra items, the question is will the '83 Euro 4.7 run fine without them. They appear be just part of the cold start system and not part of the main metering of the CIS system.

Any see any problems with what we are looking to do.

Thanks for any input.

Rich9928p

I used the stock '79 Euro CIS bits - as far as I know which are no different from the US versions (fuel distributor, injectors, etc) and grafted them onto '83 Euro intake, cams & heads for my track car - which has a 5-liter block. It runs fine. I see no reason why not to use stock '79 goodies in your case.

Tom. M

Here's the dampner setup like the Euro 83 motor has...

RicerSchnitzzle

The 83 has CIS-E which has a differential pressure regulator built in that adjusts the mixture electronically based on input from the oxygen sensor. Leaving it disconnected, the engine will run like poo. That's the downfall with CIS-E. It CAN leave you walking if one wire falls off. That can't happen with "pure" CIS, unless you run out of electricity to power the pump. I would use the distributor from the 79 with the lower plenum, throttle body and spider from the 83 Euro.

I would however keep the damper set up as it helps with overswing on the flapper keeping control pressure from spiking or waffling.

atb

Deleted. Sorry, didn't see the last sentence of your post.

atb

So is there a gasket between the upper and lower plenum halves?

Tom. M

According to PET..yep.. Better get that on the order list

Tom. M

Here's the pic..

atb

Tom, can you confirm that it's the same part # for the two motors. (My laptop screen's not big enough for PET).

Tom. M

Just checked. Yep same part number..
930 110 394 00

docmirror

Yes, the 83 Euro has the KE-Jetronic, and the non-Euro has the K-Jetronic. They are both CIS cars but the KE has a simple ECU which takes the signal from the O2 sensor, temp sensor, and adjusts the mixture slightly based on the signals.

I would transfer the whole thing into the car including the ECU, relay and CIS head with aux air device. A decent link to the KE Bosch book can be found here:

http://www.benzworld.org/forums/w201...struction.html

I've used it to diagnose other issues.

danglerb

I'm not following this, don't need to know it, but now you have me curious.

83 US were Ljet, Row were all Euro S Kjet, never heard of KEjet. Were all the non Ljets in 83 this KEjet, and I don't see any special parts in my copy of pet6.

Somebody mind explaining it slow, maybe with pictures?

GlenL

Ya know, I like your idea of bypassing the fuel enrichment circuit.

I didn't know that 83+ CIS cars had an O2 sensor. I'm not seeing that in the PET.

Tom. M

When we took off the cover on the electrical port underneath the CIS unit, it only has a connection to the air plate. There is a connecting arm that looks like it is moved by electrical current. We thought that if the fuel enrichement/dampner setup was removed and this electrical connector under the CIS unit was not connected, then it would by default operate as the 79 setup would?

I'm heading to the shop this afternoon to work on my car and I'll grab some pics of both setups and the electrical connections.

Just an FYI..the intake inlet is 10mm larger diameter and the runners are 5mm diameter larger on the Euro spider. I'll get some pics of the 79 vs the 83 spider too....and the plenum under the CIS unit is way way way larger..

docmirror

I think I was mistaken. After looking at the diagram for the 83 Euro model, it doesn't look like KE-jet. I don't know what the extra connector is on the CIS module, but it doesn't appear the be the mixture control circuit found on KE jetronic. This looks like straight K jet. I don't have the prints for the Euro engine system so I can't look up if it has an ECU or not.

I'll wait for pics. My bad.....