i would like to upgrade from a 5.3 to a 6.0. i have be looking on the net and found some going from 2,500 to like 3,500. is this a good price
with 43,000 miles
Quote # 10100927
Vehicle 1995 Jaguar XJS
Part Used Engine - 6.0L (VIN 3, 7 digit, 12 cyl)
Price $1995.00 - Used Engine
3 Year Parts and Labor warranty included image
Shipping Free Shipping in the Continental U.S.
(*There is a $75 charge for all residential deliveries)
Mileage

 

Seems a little expensive. Be aware that you'll need the later transmission (and it's electronics) too, the bolt pattern is different on the 5.3 and 6.0 blocks.

 

I paid $3k for my 6.0L. Be aware that any engine you buy will need to be checked and possibly rebuilt. Mine needs new valves and guides. Head gasket was toast and BE bearings were scored. Not an issue as I was going to rebuild anyway.

The crank is perfect and does not even need polishing. With a few minor mods the 6.0L will make just over 400hp, but best it makes lots of torque in the 2000-4500rpm range.

The 6.0L has many upgrades over the 5.3L.
O ringed injector rail
Later 6.0L had EDIS coil packs and cast crank, not an issue unless you are looking for 900hp I think.

As Jagbio said the trans bolt pattern is different, but the TH400 pads are there all you need to do is to re-drill the 6.0L block for the TH400, the dowel pin locations are standard GM so they are the same for both engines/trans combos. My 6.0L has been re-drilled for the TH400 pattern so it will bolt to my 4L60 spacer on the current 5.3L.

 

Wasn't EDIS only on the 1995-97 XJ12 saloons? I understood the XJS application kept the Marelli ignition to the end.

 

I thought the same regarding the XJS & that the Nippon Denso engine management & sequential fuel injection with cam sensor was only fitted to the X300 XJ12s & Daimler Double Sixes.

Rgds.

A.

 

Correct, except I do not know about the dates you mention. It was used on the X300 V12s [edited correction removing the XJ40]. But I imagine Warrjon was thinking the OP might pick up a 6 litre engine from such a saloon.
Greg

 

XJ40 V12's were Marelli, not Nippondenso management.

 

Thanks for the correction JB
Greg

 

Yes this is correct XJS and XJ40 only ever had Marelli, X300 was the only V12 to have EDIS and Nippondenso ECU

My 6.0L came from a US XJ40.

 

Would it be easy enough to implement the later ECU and ignition, Warren? Not that I want to bit just out of curiosity...

 

I think an aftermarket ECU would be easier and as I am going to do put it in the original Jaguar ECU case so it looks OEM.

I don't know what wiring changes would be needed. As the Denso ECU only came in the X300 .

 

1. Quote:

   Originally Posted by revski666

   i would like to upgrade from a 5.3 to a 6.0. i have be looking on the net and found some going from 2,500 to like 3,500. is this a good price

 

Welcome to the forum Mad mick,

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Graham

 

Forgive me for answering your question to Warren, I looked into this option, I liked the idea of multiple ignition coils and no distributor, also the ND system controlled fuel injection and ignition and was much more sophisticated in it's control.

Just some of the differences are:

The fuel injection is semi sequential.
MAP (manifold absolute pressure) sensors for each cylinder bank, plus high altitude correction, O2 exhaust sensors before and after cat on each bank(total of four O2 sensors versus two on XJS V12)
apart from massively different wiring loom the major obstacle is that there is an additional sensor on one camshaft to provide timing information to the Nippon Denso ecu on the V12 in 95 model onwards engine in X300

 

Just a note to anybody thinking of the switch to a 6.0 litre to remember that the Nippon Denso managed motors are not fitted with an aux. drive shaft for distributor.

 

any of you know the price to upgrade to a 6.0 like i found some 6.0s on the web for $1,500 -3,500 and some trans going for 750-1,500. i cant do the work myself so if any of you guy know what a shop would cost for all of the work. i may get the work done in a year or 2 maybe 3

 

It would probably be cheaper to simply buy a 6.0 with a car around it, if you can't do it yourself. Also, you'll be wanting to change an awful lot of parts. New tranny means new prop. New wiring harness for the engine. Possibly alterations in the AC system piping. Etc.

By the time you buy all the parts and pay for the labor and co, you'd be cheaper off buying a good condition 6.0l car...

 

No question it would be cheaper and certainly easier to buy a 6.0 car than try and make one. A big challenge would be finding a shop that would even be willing to tackle such a project and have the ability to do it.

Beacham in New Zealand come to mind, but you're probably looking into 6 figures to do what you're thinking of.

 

For a 6.0L you have 2 options

1) Buy a 6.0L engine and swap them, be aware the 6.0L might not be in good nick, mine needed rebuilding, every valve leaked, valve stems and guides were worn elliptical, head gasket was shot and big end bearing were worn. If the 6.0L is XJ40 Marelli you could use either Marelli or Lucas dissy and all the wiring is very similar, so the swap would be relatively simple.

2) Bore the 5.3L to 6.0L, Norman Lutz has a kit for doing this. He is doing my 6.0L to make it 6.7L.

Fueling for both can be done with the stock 6CU or 16CU by adjusting fuel pressure with an O2 gauge on the exhaust.

Transmissions, the Jaguar 4L80e is a BIG transmission and will not fit the XJS tunnel without a FBH. Better option is to use a heavy duty 4L60/700R4, much smaller and lighter, infact my car with the 4L60 sits higher than with the T400. Either way will require a new tailshaft.

Installation of the 700R4 (non-electronic) would be easier than the 4L80 which will require a TCU and wiring. Again Norm sells an adapter to bolt the 700 to the 5.3L bolt pattern, and it's cheaper than the Dellow adapter. I used his adapter to fit my 4L60. There are companies in the USA that sell kits to install 700R4 on a V12.