New here. I’m inheriting a ‘78 with no engine. I want to go back in with a 928 engine. Are all year models compatible (plug and play) except maybe the wiring harness plugs etc?

thanks I’m advance

 

The 16 valve 928 motors come with two injections systems: CIS (78,79, and some 80) which is mainly mechanical, and L-Jet ( 80? to 84) which is mainly electrical.

Any engine with the CIS injection will just pretty much drop in. You should be able to find a complete unit for not a lot of money. The problem will be bringing the CIS system back to life after it has been sitting, but its a do-able thing. Just expect to spend more on the CIS system repair than you do for the motor.

Here are a couple of parts cars in texas:
https://austin.craigslist.org/cto/d/...381521242.html
The white car is a L-Jet which would not quite drop in, but if you got the whole deal with all the computers and harnesses it would not be too bad. Plus you would not have the expense of bring back on old CIS system. Not clear if the red car is CIS or L-Jet.

Or you could just order one up from Mark (928 Intl)

http://shop.928intl.com/Used-45-Engi...00%2D923%2D03/

I doubt he has one that he would guarantee to run, but would not hurt to ask.

I think Peraz914 on the board here has an early engine that was looking for a new home.

 

Thankyou sir! That is exactly what I was wondering. I emailed mark earlier today and he suggested a donor car because their engines dont have the accessories included. the cars you linked are not to far from me at all. Thank you so much! A little background on the 78 928 I’m going to work on. It was my sons car. His grandad gave it to him and me and my son were going to build it up one day. My son was killed in an auto accident in 2018 so this a mission I’m on. I appreciate all the expertise and willingness to help people on this site.

 

Any 928 engine will fit.
A CIS injected engine (which is the style of fuel injection that your '78 had) is going to be the easiest engine to install. Everything else will require a serious amount of work to hook up and make run.
Euro S engines, before 1984, are CIS.
300HP!
If you can find one of those, that would give you an extremely nice car, when you are done.

 

I also have a similar question. I have a complete 1985 euro car with a trashed body and a good motor. I would like to install this motor in a 1978 car. Is this swap possible??? .... with a reasonable amount of work.

 

Yes, it is possible as long as you have all the parts, harnesses, and electronics that go with the later motor. There may be an issue about the flywheel. Are both 5 speeds? Also, you might need to keep the AC system from the early car, unless you want to struggle with the plumbing on that. You will have fuel system supply modifications to make, but likely you can just take all the lines out of the later car.

 

I'm sorry that you lost your son. God bless him and your family.

 

All you need are the later compressor, its mount, and its 2 hoses. The rest is the same. So if that is all still on the donor engine it just bolts right in.

It's a worthwhile upgrade as the later Denso compressor is very good and used all the way through 1989 S4s.

 

Define "reasonable".
I spent 3 days "adapting" an '81 relay board to do all of the functions that a late LH engine requires....and I'm pretty "handy" around a 928 and a 928 wiring diagram.
And an '81 already had relays for the electric fuel injection on that model.
A 1978 has a fuel pump relay....not much else.

This installation requires starting from scratch....the plugs that normally attach to the '85 relay board are completely different on a '78.

 

Right. I'm looking at putting a 32v motor in my '79. I will take the whole electrical system over including dash and mirrors, all harnesses, climate control etc. It's a big job, but I'm not worried about it at all (within the idea that it is a big, probably multi year project) The thing I am worried about is the flywheel, if I want to keep the clutch and back from the '79 five speed, but need the triggers for the late motor.

 

Hmm, or you could grab an 85/86 US car and remove the spoilers and replace the front bumper cover. Now you have something that looks just like a 78.

 

Thankyou may God bless you and your family too!

john 3:16

 

Yes, but the '79 is a cabriolet and the donor car for the 32v motor has no title and no reverse gear.

 

Aha! Good luck with the project. Will be following if you post it up here.