Looking at getting a used engine instead of rebuilding mine.what engines can I use for a direct bolt in and still use my intake and supercharger and factory trans with all factory wiring? Does it have to be 98-99 xjr 4.0 or can it be a 99-00xj8 4.0 or a newer xjr 4.0 or even a 4.2.

 

98-99 is the simplest, an AJ26S like you have won't require any modifications. An AJ27S which is the 00-03 4.0 supercharged will need some parts swapped from the old engine (camshaft which has the CPS wheel on it, i think older 2-pin coil packs, forget what else) and the 4.2 gets really tricky, but it's been done. Plenty of threads on both swapping an AJ27 into an AJ26 car, and the 4.2 swap, worth a search and read through to get an idea of the effort needed. The blower, intercoolers, etc all stays the same within all the 4.0 engines, the main thing that changes in the intake side from the aj26 to the aj27 is the TB goes fully drive-by-wire, so you need to keep your old TB as well.

 

Well I have the old engine torn all apart and am planning on putting my updated timing set in the motor I get. Swapping parts from my engine to the new engine isn't a problem I just wanted to know what engines I can look for.on the 4.2 can I bolt my old intake and supercharger, valve cover and coil packs on the 4.2.and I can also get a 4.0 na right since there pretty much the same

 

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I did a search and ill stick with the 4.0.
I can get the sc and na 4.0 right?.also does the motor have to come from a xj series?

 

pistons and compression are different on the s/c engine, it also doesn't have VVT while the n/a does, don't remember what else is different. the Student Engine Repair Course pdf goes over the differences in detail between the n/a and s/c engines.

 

Yea I think the sc engines compression is lower and the na pistons are more of a flat top.the na has vvt so ill have to swap my cams front cover and valve covers over but would my intake and supercharger bolt up.I think it should but with the higher compression on the na by me adding my supercharger would there be detination and is the lift on my cams interfere with the na pistons?

 

I don't think you can use a XKR, they are AJ27 if I remember correctly.

 

Cant I use my front cover, my valve covers with coils, my cams, my intake with injectors, my tb with a aj27?

 

If you do a search for AJ27 into AJ26 you should find several threads dealing with this.

 

Will my intake bolt to a aj27 and aj27s? Like I said I dont mind swapping parts I just dont want to mess with the lower part of the block

 

Read this post from Avos. It might help answer some of your questions.

https://www.jaguarforums.com/forum/g...k-4-2-a-23763/

 

Ok im confused. Is a aj27 a 4.0 or 4.2?

 

AJ27 is a 4.0.

 

Aj27 is a variable timing engine and aj26 isnt right

 

and that guide is for swapping in a 4.2 which im staying with a 4.0.

 

He is a post on a thread I had a year ago.

AJ26S
The supercharged version of the AJ26 is used in the high-performance R versions of Jaguar's cars. The engine was updated with AJ27 specifications for 2000. It produces 370 hp (276 kW) and 387 lb•ft (525 N•m) with the help of an Eaton supercharger (modified roots-blower). The supercharged engine did not use variable cam timing as the normal benefits of improved volumetric efficiency are not noticeable on a boosted engine

Vehicles using the supercharged version include:

AJ26S
1998-1999 Jaguar XJR
1998-1999 Jaguar XKR

AJ27S
2000-2003 Jaguar XJR
2000-2003 Jaguar XKR
2000-2002 Vanden Plas
2002 Daimler Super V8


So for my understand the only engines that are plug and play will be a 98 or 99 xjr or xkr. If you use a aj27 you will mainly be using the block and everything else from your engine. If it were me I'd get the 98 or99 SC engine. Even if you pay a few dollars more. If you use a aj27 you will need a complete gasket kit and mls headgaskets.

 

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Why would I need mls head gaskets for the na? So I know a 98-99 aj26s is a direct swap.aj27s id have to use my intake with injectors?

 

You don't need MLS head gaskets but it's a better and more durable head gasket.

What engine are you thinking about putting in your car?