44S268

I'm desperate. Took the top of my 1989 '44S2 head off when its chain snapped. Would you believe it there is a chain which is not mentioned in any service schedules? bright spark purchased a '68 variocam. Anyway the guy I purchased the engine from advised that he has done lots of similar swaps; no problems as he woiuld also send '68 engine wiring harness and CPU. BUT since last July when the transplant was complete there is no spark and no fuel. All usual suspects checked- DME CPU etc. I bugged the seller and he says the '68 engine will only work with a '68 alarm control module part number 928 618 260 01. He very kindly sent it over.

There is only one problem. The '44S2 has its own alarm control module with a 944 part number wired into the '44s2 chassis wiring harness. There is no spare plug on the '68 engine wiring harness so I guess I am supposed to guess how to wire in a '68 plug onto the '44S2 wiring harness.

Has anyone else transplanted a 968 variocam into a 944S2 chassis? Did you have similar problems. How did you solve them?

The other issue might be that we did not replace drivetrain; gearbox torque tube etc. To make it all fit in we had to transplant '44S2 flywheel bellhosuing and clutch onto back of '68 engine.That meant we had to wire the '44s2 flywheel sensor onto the '68 wiring harness. I am wondering if the '68 CPU is looking for signals from the '68 sensor.

Any suggestions?

Airflite40

try www.944s3.com

matt did the exact swap years ago and he had simiral no start problems, he outlines the necessary wiring steps to get it runnin

actually looks like his started as an NA, not an S2, sorry, but the site should be helpful.

Lemming

Lot's and lot's of different things could possibly be incorrect. I am running a 924S alarm module with a 968 engine, no problems. Also, as long as you are getting the signal from the S2 flywheel, you should be good to go. Attached is a word document that Todd H authored.

Chads996

Read that document. It will make more sense. I am in the middle of this very same swap. You picked the easiest one to swap. (S2 to 968).

There is a very important note on that document. If you did not swap one of the wires on the plugs (engine harness), you may have fried your ECU.

C.

44S268

Thanks guys. That is a lot of help. I will now go exploring.

Cheers,
A

PS I love the Polish eagle in the Borat impersonation.

Todd Holyoak

Wow, there is something I haven't thought about for years. Glad to see it is still of some use.

-Todd

Lemming

It was a HUGE help when I built my Frankencar

Chads996

INDEED - Thank you!!!

C.

JakeS2

Thanks for the doc too. I have a bit different setup ongoing ('91 S2 with '92 968 engine) but there should not be much differences in the wiring, for some reason in the WSM the wirings for '90 and '91 are separate, need to find out what is the diff

josephsc

I have it bookmarked -- it's very handy!

http://members.rennlist.com/tholyoak...wap_wiring.htm

Zneed4speed

Having a problem myself. I have put Chad's "old" S2 engine in my '89 8V chassis. Used that doc. to make sure the wiring is right, have spark and fuel but no power to the injectors. It appears the DME is sending a signal to ground/fire the injectors but they aren't getting 12V.
Any ideas?

Mark944na86

Do you mean the timing chain? How many miles was on that S2 head before it snapped?

44S268

It is not a timing chain perce. The timing belt is something different. Twin cams have a chain that drives the second cam and that snapped at about 225 Kilometres; about 120K miles.

Mark944na86

Yep, that's the timing chain. And they have a reptutation to self-destruct at about the 200K kms mark, unfortunately.

I had mine replaced on my S2 at only about 60K kms. They need to be checked periodically on the 16V heads; often, there is just a plastic guide that wears and needs replacement. You can get the replacement piece from Zims (www.allzim.com).

There's a good write-up at Clark's garage www.clarks-garage.com on the issue.

What damage was done to the head when the chain snapped?

44S268

It took the back corner of the Head off. Otherwise the motor was fine. No evidence of bent valves etc. What I have read since I discovered the chain was there; i.e. when it snapped is that the chain and sprockets last about 200K. I've never heard of 60K being their usueable life. Anyway my '68 motor has new cams (one piece with sprockets) new chain etc. It just won't start.