Cooper (non S) Modifications specific to the MINI Cooper (R56).

2007 N12 to N16 swap

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Old 05-21-2019, 09:46 AM
wascobi
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2007 N12 to N16 swap

hi everyone. my first post. I recently acquired a 2007 just a with a dead N12 engine. only 80K km on the car. the cost to rebuild and replace parts is astronomical, and there seems to be a shortage of good N12s at the wreckers. Ive seen posts where people have asked about swapping an N16 into an N12 car, but no real info. Im about to buy a 2013 N16 with only 23K km on it at a wrecker. from other threads and my own research, the oil pump and its flow control solenoid are the hang up. Im hoping this swap is a thing. wondering if you can just remove the solenoid from the pump and plug it with a threaded plug of some type? same with the hole in the block? some type of threaded plug? or swap the pump to an N12 style. Im going to run as much of the N12 accessories as I can, including the oil filter housing as I think theres a relocated oil pressure switch in the N16 one. hoping to squeeze a magna flow 553028 into the project budget as well. any assistance or guidance here willl be greatly appreciated. Im closing in on 60, and this is my first mini. my dad was a BMC factory sponsored racer back in the early 60's. racing Cooper S, Healys and MGA's. lots of memories.
thanks!
 
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Old 05-21-2019, 11:15 AM
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What killed the N12? what was done to diagnose it?

[size=3]N16 swap is doable. if you want to just drop it in and go, then you need the wiring harness of the engine AND the ECU. since N12 and N16 have the same ECU file format, I believe you can clone the N12 ECU into the N16 ECU that way you can start the car.[/size]
 
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Old 05-21-2019, 05:51 PM
wascobi
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I called a local mini dealership and asked if they could clone an ECU. just crickets on the other end. I did buy my N16 today. 2013 with 47K km. the wrecker had run it and it has 210 comp right across. on a pallet waiting to go. gets delivered tomorrow. lets hope for the best. one suggestion given to me was just run the 2007 harness and ignore the oil pump solenoid. if I knew what the default position of it was ( high oil pressure or low oil pressure ) that might be the ticket. a call to a different dealership provided the same results. um, er, ah. so does anyone know what the default position of the oil pump solenoid is? is it variable voltage for different positions or on/off? hoping for some mini techs here that like to think/work out of the box.
 
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Old 05-21-2019, 06:00 PM
wascobi
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the lady I bought it from overheated it. drove it until it quit. the valve seats are falling out, about .010 of warp, and there is an amazing amount of piston slop. it was all original parts. when I put coolant in it and ran it a few minutes, it leaked somewhere around the water pump.
 
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Old 05-21-2019, 06:11 PM
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Got you...

To your questions:

the oil solenoid is variable and the idea is emission control.

The N12 harness might not be compatible as some sensors have evolved to have a different plug like the oil pressure sensor and perhaps the MAP sensor.

I recall seeing a plug on the cyl head that MIGHT be used for the N12 oil sensor. Not sure though.

The dealer wouldn't know how to clone, they will sell you brand new items only. Cloning can easily be done using Ktag or galetto 4.

Check newtis.info and compare wiring pin assignment. My N14 to N18 swap had only 3 wires relocations.
 
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Old 05-22-2019, 08:02 PM
wascobi
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so far I've noticed the plugs for the therm housing are different. easy to splice. the N12 has a one wire oil pressure sensor, the N16 is a three wire. going to see if I can find a newer one wire/pin sensor that will fit in the N16 filter housing.

if the oil pump solenoid is truly variable, I just need to find out what voltage would provide about 40-ish psi. does anyone have an oil pressure gauge on a similar? whats the max oil pressure you've seen? I hope I can get some pics up soon.
 
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Old 07-03-2019, 09:25 PM
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N16 swap update

Im actually shocked at the lack of info here. there was tons on others when modifying my Z3M. Ive pulled the pans off both motors. they are in fact two different design oil pumps. I will be installing the '07 pump on the '13 engine. just need to figure out how to plug the hole in the block where the oil pump solenoid wire went through.

the oil pressure switch are tricky as well. looking up the two, the '07 mounts in the head and supposedly has a 16 x 1.5 thread. the '13 mounts in the oil filter housing and supposedly has a 12 x 1.5 thread. in keeping the newest parts possible, the vacuum pump and thermo housing on the '13 are different, and block access to the oil passage plug. maybe thats why they moved it to the oil filter housing. Im hoping to find an adapter to swap over the older sensor. the craven speed adapter has 3/8 and 1/8 npt thread. how does that work? no reply from them yet.

got all my new bolts and seals now. hoping to make some progress this weekend.
 
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