318 to m20b25 do i need the wiring LOOM? Also torque convert

Post Tue Oct 07, 2014 12:41 am

Hi, i have finally got my self a m20b25 engine and ecu. Is that enough for the engine swap? i will be using the 1.8 box as i researched that it will do the job fine till i turbo it. Also the 2.5 was an auto so it has a torque converter on it. Does replacing it with a flywheel include replacing the crank? Seen some motors that needed a diff crank.

And the final and most important. Do i need the wiring loom of the 2.5? I have the engine and ecu and thats it, also a 1.8 fully stripped sitting in the bay. Do i need it? or would everything plug upto the 1.8 loom.

Ok very last question. Trying to work out what is that ring sensor around my ht lead?? Sorry might sound like a silly question but i wont on diesels (In a fleet) 99%.

Thanks for any info.
Matt

Post Tue Oct 07, 2014 6:55 am

You can't really use the 1.8 gearbox on an M20. Although it will bolt on to the engine, it will be rotated by 10 degrees so you will need to modify the gearbox crossmember and linkages to suit.... its much less hassle to do it right first time and use the M20 gearbox and prop etc.

You don't need to swap the crank to change between torque converter and flywheel. You will need flywheel bolts and the load spreader plate (that goes between the bolts and flywheel) and don't forget to fit a spigot bearing in the end of the crank - there two sizes of spigot bearings available, which you need will depend on the size of the gearbox input shaft.

You will need the M20 engine loom, the 1.8 engine loom will not work.

The sensor on the HT lead identifies the cylinder to the ECU so the it can better control the fuel injectors. The engine will run without the sensor, but it's better with it.

Post Tue Oct 07, 2014 7:10 am

I have Motronic 1.3 looms in stock.

Post Tue Oct 07, 2014 1:37 pm

Thanks for all the info jmc, all bad news

And how much are you selling them for are they complicated conversion?

Post Tue Oct 07, 2014 1:58 pm

I've PM'd you with what I have.

Post Tue Oct 07, 2014 2:20 pm

The old engine loom should have been left connected to the 1.8 engine when you removed it. The ECU plug pulls back through the bulkhead into the engine bay, and there are just an earth and 12 volts+ wire to disconnect at the battery side, and a 20 pin plug to disconnect near the fusebox.
Similarly, when you get your new loom, fit it to the engine before you fit the engine to the car.
Your replacement loom can come from either a 2.0 or 2.5 litre facelift M20 engine - they are identical.