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Old Aug 10th, 2014, 09:07 PM
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Can I swap my jcw engine with an s engine

I recently brought a 2003 jcw (200bhp) edition with a very very noise engine. I thought the noise was a snapped valve bouncing around inside but after taking the head of earlier I found that it is small end bearing failure. There is no point in me rebuilding the engine as replacements are so cheap.

I'm looking at dropping an s engine in and fitting my supercharger to it.

I heard that the only difference engine wise between the s and 200bhp jcw engine is the supercharger and the exhaust ports are ported.

I can port the exhaust ports on the s engine no problem. Are there any other engine changes to be aware of? Cheers
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Old Aug 10th, 2014, 09:42 PM
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From Wiki:


Cooper S R52 and R53

The first JCW Tuning Kit to be made available for the Cooper S was an upgrade for the Cooper S, producing a total of 200 bhp (150 kW). Released in 2002, the kit consisted of the following components:

Uprated cylinder head, gas-flowed and ported
Uprated supercharger, faster-spinning
Uprated spark plugs
Uprated exhaust system
Remapped ECU
Decorative badges, individually numbered engine plate and certificate signed by Mike Cooper

__________________________________________________ __________________________

You already have the jcw supercharger pulley, exhaust, and remapped ecu.

If you port the exhaust (and somewhat who ports heads well can do a better job than the jcw head)
and use the jcw plugs, you should be right back to a full jcw package. Maybe give a little attention to
the intake ports while you're at it.

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Old Aug 11th, 2014, 07:39 AM
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Quote: Originally Posted by cristo (original)
From Wiki:


Cooper S R52 and R53

The first JCW Tuning Kit to be made available for the Cooper S was an upgrade for the Cooper S, producing a total of 200 bhp (150 kW). Released in 2002, the kit consisted of the following components:

Uprated cylinder head, gas-flowed and ported
Uprated supercharger, faster-spinning
Uprated spark plugs
Uprated exhaust system
Remapped ECU
Decorative badges, individually numbered engine plate and certificate signed by Mike Cooper

__________________________________________________ __________________________

You already have the jcw supercharger pulley, exhaust, and remapped ecu.

If you port the exhaust (and somewhat who ports heads well can do a better job than the jcw head)
and use the jcw plugs, you should be right back to a full jcw package. Maybe give a little attention to
the intake ports while you're at it.


Cheers just as i thought. Right off to buy an engine
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