block being over bored 20 thou , 0.5mm

 

Blocks are so much more 'skeletal' these days, compared to the old cast-iron lumps I used to work on.

 

bespoke oversize forged race pistons

 

short block all assembled , probably the first 5100cc xkr in uk, next step fit heads /cam timing etc

 

Wow! 6 months of downtime with the engine.

Assembly looks great, however. Are you doing the work yourself? Are those cylinder liners removable or, an integral part of the block?

Good luck and keep us posted on the final assembly and running of the engine. It would still be very helpful to be able to pin down the cause for the failure. Without that I would be quite worried about a repeat.

 

5054cc - to be exact, if the bore was oversized by 0.5mm to 93mm

 

yes a long time indeed, took a while having the pistons made as they are unavailable from main dealer , the liners are integral to the block

ye 5054cc close enough lol
might ad a few bhp

cheers

 

Not sure if this is helpful or not re: cause.

I now have a Ftype R, but recently had an XKR and when I was at the dealer, the chief mechanic showed me a 5.0 that was holed by connecting rod and had other internal damage. When I asked him what happened he said it was abuse and the computer gave him the information. The owner had downshifted at high speed without watching the rpm's and went well over red line, and blew the engine.

As he was a repeat customer, Jaguar agreed to replace the engine which actually surprised me.

This was at the time I sold my XKR (fabulous car) and bought the Ftype (just as fabulous, or more so) and I am now much more mindful of downshift engine speed.

Lawrence.

 

ps , looking for torque settings as they too seem to be unavailable? anybody

 

I wonder if the dealer really knew what he was talking about (don't ever take that for granted).

In most modern cars of the last decade, at the least, even manual shifts are controlled by the TCU. It should NOT allow the transmission to be shifted into a lower gear than the speed of the car and its RPM range can safely accomodate. That is one of the HUGE advantages over conventional Manual transmissions where you could scatter an engine by over-revving on downshifts.

Now, it is possible that the electronics failed in these cases but, I would not call that abuse, it would be a clear failure of factory software for which the warranty should apply.

 

Torque settings are scattered all through the workshop manual, sometimes at the start of the section, but more often in the steps of the reassembly instructions. Which ones are you after (and do you have a copy of the manual)?

 

From the 5.0 Owner's Manual section on manual operation of the gearbox:

So, I agree: the TCU prevents over- or under-revving. As you say, the only way for this to happen would be a fault, not driver error. The dealer was talking bollocks.

 

yes so I see
got them all now thanks

 

Where did you get the bearings and pistons from, I have the same problem

 

How do you go over the redline? The computer won't let you down shift if it will go over the redline and if you try to go that high in any gear the rev limiter cuts in preventing it.

 

Per your description of what happened. I would guess something went wrong with fueling/02/MAF as well. Depending if you were at WOT or not. If you dropped down a gear, if not hard on the throttle I don't see the pulley as the problem. If another sensor was the failure it should have thrown a code in the ECM.
Is there any certainty that this ECM was not reflashed with a different tune? The stock desired A/F is quite rich even with the added pulley. As mentioned by others, the fuel setup is stable to 600hp or so. I'd take a close look at the front O2 sensors and verify they are working properly.
Did you run a higher Octane 110+ leaded fuel at any point?

Regards,
Derek Fricke

 

They doesn't matter at WOT.

 

Yes. I wasn't sure if the engine went out during WOT or letting off and the ECM switching back to OpenLoop.
In that case, you may want to take a glance at the MAF's just to be safe and see if the voltages are functioning properly once she's back together.

Regards,
Derek Fricke

 

Not only MAFs, but the leaks on a intake system, PCV system, some mods of the exhaust system may cause a lean conditions @open loop.
First of all the LTFT/STFT should be checked, if they are out more than a 10% - it should be investigated. The SDD software allows to read adaptive trims from a ECM for a idle/normal/high load condition in almost 1 click.

 

I need to setup the SDD on my setup. Are you able to log the data with the SDD or just display real-time data?