Thanks for the come back. where would I get an external controller to run the VVT solenoids? Would it work with the 2001 xkr ecm?

 

HI,
I`m not 100% sure what part has to be change to adopt AJ27 supercharger to 4.2 engine.
Are the 2007 XKR intercoolers the answer? or do I need someting else? Should be also aluminium plates from between intersoolers and the engines replaced?? Will the 2007xkr model fit 2003 xkr model? are all 4.2 intakes the same??

Thanks for help.

 

The 2007 XKR intercoolers will fit older 4.2 engines, including the 4.2 intake manifolds (I guess that is what you mean with the aluminum plates). There where only 2 different versions 4.0 heads/manifolds/intercoolers and 4.2 heads/manifolds/intercoolers for the xkr. You can fit the 4.0 manifolds/intercoolers on a 4.2 head, but that requires some small modifications.

 

Dear AVOS thanks a lot for your help.
I guess thoose easy modyfications are:
"-Bolt holes from Intake manifold do not line up, when counting from the front, numbers 2 and 4 fit, and new tapered holes need to be made in the heads for 1 3 and 5 (easy). Then port the intake manifold to ensure good alignment with the intake ports of the head"

I dont want to take heads off. Is it really easy? Any tips, any instructions??

Thank again.

 

It’s easy if you can drill and are able to make a M8 tap, and last but not least be careful, then you can do it insitu.

Once thing though, if you use the 4.0 manifolds/intercoolers on the 4.2 heads the position of the intercoolers goes back about 7mm iirc , so you may need to make spacers between the V8 outlet an the intercoolers. When I did it it was easy as I had the TS kit, so could just alter the supercharger outlet.

 

Avos, thanks again!
What should I do with ignition coils?
Avos wrote in another post "The AJ33/34 (so 4.2 engine) has also 4 pin, but is different again (digital iirc), so that is why you need to reuse your 4 pin from the AJ27."

So is it posieble to put AJ27 coils to AJ33 cam covers and fix it with just one screw?

 

No need to try, It will not fit.

 

Finally swapped.
The engine do not start but I belive it is a small issue!
AJ27 was swapped with AJ33. I can confirm that camshaft indicators were exactly the same (even patr numbers) so there was no need to replace.
Unfortunetly the flywheel was not replaced and no one checked if they are the same or not. The mechanicks forgot about it.
Does any one knows if flying weels were the same or diferend in this models?
Thank you in adwance.

 

The AJ27 and up should have the 35 tooth(/hole) plate, only the AJ26 ones have a 34 tooth one.

But to be sure, better to check it, just remove the black rubber plug next to the crank sensor, and count them via turning the crank.

 

Sorry to revive this thread. But, I have a 2003 xjr r1 that needs a valve job. I figure I may as well put a lower mile engine in it. I found a 4.2 out of an s type r. Can I just drop the 4.2 in place of the 4.0?

 

I think there are far more details in this and similar threads, the short answer being no.

 

Hello everyone on this forum!
It's being a long while since I was here. I've been enjoying my 03 xk8. It now has 110k miles on it. Now i bought a 2000 xk8 with 96k miles to support it.
Both cars have clean and immaclate bodies but the 2000 is currently having severe engine issues, so I am contemplating on swapping the engine but with a 4.2 xk8 because of the power difference. However i am still keeping my 2003 4.2 xk8. My great worry is that, would the 4.2 engine fit perfectly into the body of the 2000 4.0? And if not, what modifications would be needed?
Any guides from the valuable and experienced members of this forum would be greatly appreciated and acknowledged.
Thank you all!