Author Topic: M42 and m44 engine differences *** urgent help please (Read 7222 times)

Avtovaz · « **on:** September 11, 2012, 11:50:19 AM »

I have a compact with a m42 engine in it, it's just seized up on me, long story.

I have a m44 with nothing on it, it looks like the inlet and exhaust from the m42 fit only real difference I have noticed is the crank sensor is in a different place

Can I dress a m44 in m42 stuff???

I am doing a rally this weekend so I need to know ASAP!!!

Help please!

DesktopDave · « **Reply #1 on:** September 11, 2012, 12:39:44 PM »

I've never compared the two directly, but at a minimum you'd have to fit the M42 crank sensor to the snout to run the M42 DME.

You'd likely have to short the EWS-II system as well, if installed. I thought all the compacts used that system, though I'm only familiar with NA market cars.

Avtovaz · « **Reply #2 on:** September 11, 2012, 01:03:22 PM »

My car hasn't ews.

I mean put the m42 loom on it brain the lot

DesktopDave · « **Reply #3 on:** September 11, 2012, 02:05:05 PM »

Yeah, that's what I was thinking. The only sensor differences I'm aware of are:
The M44 has the wrong crank sensor.
Later M4x have one coolant temp sender, earlier motors have two
The later DISA intake manifold is different...but both your motors have that, right?
Later M4x have knock sensors, but it's no problem to leave them unplugged if needs be

I wouldn't figure it'd matter, but I'm no expert.

Avtovaz · « **Reply #4 on:** September 11, 2012, 02:12:09 PM »

Quote from: DesktopDave;115832

Yeah, that's what I was thinking. The only sensor differences I'm aware of are:
The M44 has the wrong crank sensor.
Later M4x have one coolant temp sender, earlier motors have two
The later DISA intake manifold is different...but both your motors have that, right?
Later M4x have knock sensors, but it's no problem to leave them unplugged if needs be

I wouldn't figure it'd matter, but I'm no expert.

i have noticed the m44 has the one sensor for the coolant, but i think it does the same job as one, but im not sure.

The cam shaft sensor is on the other cam, and the crank sensor is ont he back of the block not the nose. So, i was thinking the m42 can sensor would fit int he m44 cover, and the crank one the wire will reroute to the back of the block.

So im thinking maybe these are the only two hurdles.

BUT im not sure

Since the first post i haev taken the old motor out and i have just come home for something to eat, i think ill go back now and carry on!

DesktopDave · « **Reply #5 on:** September 11, 2012, 02:32:48 PM »

I'm not sure about the cam, but I know that the M44 and M42 crank sensors are not interchangeable. You need the crank snout sensor and "missing tooth" 60-2 crank wheel for the earlier M42 DME to work.

Avtovaz · « **Reply #6 on:** September 11, 2012, 03:20:50 PM »

Quote from: DesktopDave;115835

I'm not sure about the cam, but I know that the M44 and M42 crank sensors are not interchangeable. You need the crank snout sensor and "missing tooth" 60-2 crank wheel for the earlier M42 DME to work.

right, crank sensor is longer, cam sensor is shorter.. I dont knwo if the plugs are the same as tehy have been chopped off when the manifold was removed! typinal scrappy heavy hands...

Cam is read off 4 blades which bolt onto the n/s cam pulley, but i recon teh pulleys will swap along with the front covers to mount the cam sensor and the crank sensor if i needed to put the m42 front pulley on. I think the pulley will fit.

But when i took the rocker cover off, i noticed the cams where rusty, so im thinking what stat is this motor in, it had leaves in the plug holes, so it looks like my mate has kept it outside...

so its time to spend even more money on ANOTHER engine!

thanks for your help though mate!

Avtovaz · « **Reply #7 on:** October 02, 2012, 05:10:26 PM »

Desktop dave, or anyone,

I now have a m44 with schick [sp] cams in it, the m44 i didnt reolise the DME is more closed , i mean, you cant swap the chip, so if i want to play with the ecu i have to spend 3x as much, but i have a enda chip in a m42 dme.

So, im looking at this again for this m44!

How can i find out if both looms are the same at the DME plug? The motor now has a m44 loom on it.

Does anyone else know of anyone who has done this???

thanks!

DesktopDave · « **Reply #8 on:** October 02, 2012, 07:34:48 PM »

Wish I knew. I'd google the wiring diagrams and spend a few quality hours checking them pin-by-pin. Alternatively, you could pull the connectors apart and check the wire colors. That'd be riskier.

You could also try some of our chip tuners - they might have a complete solution for you. Off the top of my head I'd bet Midnight Tuning (bmwconnect here) and MarkD would be great resources, IMHO.

Avtovaz · « **Reply #9 on:** October 03, 2012, 03:19:46 PM »

ok thanks mate, ill report back what i find out soon!

wannam42 · « **Reply #10 on:** December 09, 2012, 09:36:23 PM »

And??