Alright guys, I recently got an '03 S-Type R, but the kicker is it needs a new motor.

However someone has a totaled S type with the 4.2 NON supercharged motor in it, I was wondering if I could use the short block out of that car with no crossover issues?

Thanks in Advance, David

 

Be a little patient as I don't know how many people will know the answer!

 

For one thing- the non-R has 11:1 compression vs. the -R which is 9:1. Not sure if the difference is due to piston dome shape, head configuration, or both.

 

Moscowleaper is asking a similar question here https://www.jaguarforums.com/forum/x...-na-xj8-74095/ you might want to keep an eye on that thread also.

 

I've looked into the cylinder of the 4.2SC today. The pistons are dished, the heads are all the same for 4.2NA and 4.2SC, the only difference is the plug in the oil channel to VCT (which should be removed if the head is installed on NA engine).
I suppose that if you install the NA engine with supercharger the CR will be way to high, so the engine will ping all the time.
Wish you were closer to me, so we can exchange the engines

 

Oops i've forgot that the NA engine doesn't have the piston cooling oil jets, so that might be an issue too.

Sorry, can't edit mine posts

 

Well thanks for the answers so far, looks like I'll just be buying a new motor

 

One on EBay with 64K miles. 2005 model.
ENGINE 2005 JAGUAR XJ8 4.2L 64K MILES | eBay
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