Forgive the newb, but I searched and found no DOCUMENTED, DEFINATE answers both here and on teh interwebs. What, if any, are the differences between a JCW 1.6 and a S 1.6? Reading on some sites different pistons, slightly different valves, re-worked head, etc and some sites say nothing other than some remapped ECU stuff, different clutch, blah, blah, blah.
I just want some clear cut facts before I start bragging to my friends.

 

Regarding the engine, differences are:

Air intake box.

Different variation of the KO3 turbo, and no it's NOT a KO4.

Exhaust manifold.

Exhaust down pipe.

Pistons, 10.0:1 instead of 10.5:1 as found in the MCS

Flywheel and clutch

Maf and Map sensors,

Iridium spark plugs.

ECU tune.

If I have forgotten something, I'm sure others will chime in.

 

 

And here I was thinking I was gonna get smacked with a wet noodle for asking this question that has been answered 1000's of times.

 

It has been asked a few times but every time the answer can and do vary slightly. No harm in asking a question if you don't think it is fully answered or perfectly correct.

I have yet to see a scanned page showing the difference form a MINI publication. If I had seen one of those I would repost it.

 

If the Engine is made in Germany there must be a good reason. I have read about the Factory JCW way back in 2008 that the engine block was beefed up as well as having the transmission beefed up with different ratio gears.

What always amazed me was that they did not put anything on the engine or valve covers to say this is a JCW engine. No sticker or anything.

I have driven a cooper "S" and believe me when I say that the factory JCW is a totally different car. My JCW does have "Sport suspension" and the "S" I drove did not but as far as driving and power the JCW is top notch.

I'm not saying the JCW is better then the "S" but just much different. The JCW is for people that want excellent performance and don't really need to or want to modify their car.



I love my factory JCW but I probably will get an Automatic Transmission "S" sometime in the future and I'm sure I will love it too.

Of course I will have a dealer installed JCW performance kit installed on my Automatic "S" as well as the JCW Brakes.

If someone would just come out with a beefed up Automatic transmission that could handle the power of my JCW I would keep this car forever.

 

I am surprised about that also. No sticker even on the JCW intake. Cost saving I would imagine.

 

I'm willing to bet the engine block serial number would reference to such.

The Bentley publications service manual walks through the difference of the factory JCW vehicle.

- Erik

 

I'm sure it would, but if I go lift the hood of my car and see the serial number, I am not going to say "hey now THAT is a JCW engine because look at that serial number!"

I have flipped through the book but will take a closer look this weekend.

 

From the Bentley manual...

Engine Code, type
N14 MCS - N14B16AC, VANOS
N14 JCW - N14B16TO, VANOS

Displacement cc (cid)
N14 MCS - 1598 (97.6)
N14 JCW - 1598 (97.6)

Bore x Stroke mm (in)
N14 MCS - 85.8 x 77 (3.37 x 3.03)
N14 JCW - 85.7 x 77 (3.37 x 3.03)

Comp. Ratio
N14 MCS - 10.5 : 1
N14 JCW - 10.0 : 1

Torque lb-ft @ rpm
N14 MCS - 177 @ 1600 - 5000
N14 JCW - 207 @ 1850 - 5600

Horsepower hp @ rpm
N14 MCS - 171 @ 5500
N14 JCW - 208 @ 6000

Engine Management
N14 MCS - Siemens DME MED17.2
N14 JCW - Siemens DME MED17.2

From the Bentley manual...
Also the JCW has slightly larger rear disk rotors (and red painted calipers). And I have read the JCW has a more durable 6-speed (??).

 

Walk, see page 010-15 (Product Familiarization) in the Bentley service manual.
It walks through the mechanical changes / difference of the JCW N14.
That list is what I refered to from my previous post.

- Erik

 

Yep was still typing that just now.

I notice the pic on that page shows a JCW emblem on the air filter box.

 

The cylinder head is exactly the same, on the MCS and JCW, regardless of what is quoted, the JCW does NOT have this: " Cylinder head wall thickness changed in some places in relation to water jacket to remove local peaks caused by increase in performance" or this "* Improved intake valve seat material and extra-hardened intake-valves" .

 

Where is your source of information that this is not true? Are the MINI part numbers the same? I am reading elsewhere that both items are correct - but I have no idea if their sources are also incorrect.

EDIT: And I am not trying to be difficult. I have seen several errors in the Bentley manual and it is rather annoying if there are more errors in a book that costs $100 !! A quick check of RealOEM suggests that the engine cylinder head is the same part # between MCS and JCW, but the engine block are different. Also RealOEM shows intake/exhaust valves as the same part # between MCS and JCW.

 

My source of accurate info, comes from my workshop, I have a few brand new MCS and JCW engines, some of which where stripped for research, modified and rebuilt, and some of which, are still untouched factory units, and besides my actual physical measured info, the part numbers are also the same between the MCS and JCW components, we are referring to here, "cylinder head and valves"

I also put up a list of differences, in this thread, post NO 2

 

Thanks czar - appreciate the info.

 

This seems high from what I read. It should be 8.3:1 for the MCS But I have read numerous articles showing it to be Comp. Ratio N14 MCS - 10.5 : 1 N14 JCW - 10.0 : 1 What gives?

 

What you quote as 8.3:1 is correct for the W11 supercharged 1st gen MCS, as for the N14 turbocharged MCS it has a CR of 10.5:1 and for the JCW it has a CR of 10.0:1

 

Thx, I knew I read it somewhere.

 

Czar, the parts break down for the 2012 JCW n-14 shows a different fuel pump. Did they up grade the pump?

 

Are you referring to the difference between the HPFP on the N14 and N18 engines ?

If so, at this moment in time, I can't give a definitive answer, however I suspect, that the HPFP as fitted to the N18 engine, is simply a supersession revised HPFP, logged with a different part number, this happens quite a lot.

 

Nope I am seeing a different P/n for the 2012 JCW's vers the 2010 pump used on the N-14

It looks like 3 changes since 07

 

3 month ago the numbers showed 3 revisions now it just shows the one, I see it has been cleaned up.

 

I currently don't have a 2012 part number list, what I do have is the HPFP for the JCW as being: 13517588879 and for the N18 engine this: 13517592429 anything other than that, I don't know about, and will think, it will be a revised supersession HPFP, still retaining the same working pressures, the same fittings, the same drive engagement, and maybe they finally cured the pressure failing issue!

 

You have the same numbers I do , I should have wrote down the 2 others I had for the n-14. But you hit the nail on the head with the piston change and a possible HPFP change I am wondering the same thing. It seems to me I saw a service bulletin with this HPFP upgrade. CZAR did you find out if the new pistons were now coming from Germany or still out of France?