Thinking about getting a MY 2007+ XK or XKR after XJ8.
#21
I can't agree with you assumptions of the reliability of the 5.0L engine unless you can show me the data that supports these issues. Until then all the comments on any form is but mere hearsay. Please provide the numbers on how many waterpump or timing chain failures have happened on the 2010-present 5.0L engines. It is similar to me that the duck bill in the 4.2 cars is a major problem. Without data we have nothing.
My motorcycle riding buddy is the manager of parts at a local Jaguar dealer. He was the one who said the 4.2's, specifically the SC, were the least problematic when I was shopping for my first XKR. I'll see if I can get some hard numbers. Challenge of course is I would expect 07-09's to be higher mileage. What I really need is warranty repairs for real data.
The 5.0 is more reliable- when you look at it from the upshot, which no one has discussed yet.
The biggest innovation in the 5.0 is the cam phaser. it gives lighting quick power, so good that even Ford is licensing it from Jaguar. When you think about hotrodding from simpler times,the first thing one did was cams.
Second thing one did was forced induction, the NEW Supercharger is greatly improved and has no whine.
The third thing one did was faster more tuned fuel- Direct Injection in the 5.0 is no joke, another industry first they have centrally mounted the spray.
Even if the 5.0 had the same output as the 4.2, the torque curve of the 5.0 is nothing short of glorious. And in real world driving, the torque and thrill is there in regular non high rev driving.
While 420hp is a powerful car, 510hp with active cams, electronic diff an direct injection, you are in the supercar territory.
The biggest innovation in the 5.0 is the cam phaser. it gives lighting quick power, so good that even Ford is licensing it from Jaguar. When you think about hotrodding from simpler times,the first thing one did was cams.
Second thing one did was forced induction, the NEW Supercharger is greatly improved and has no whine.
The third thing one did was faster more tuned fuel- Direct Injection in the 5.0 is no joke, another industry first they have centrally mounted the spray.
Even if the 5.0 had the same output as the 4.2, the torque curve of the 5.0 is nothing short of glorious. And in real world driving, the torque and thrill is there in regular non high rev driving.
While 420hp is a powerful car, 510hp with active cams, electronic diff an direct injection, you are in the supercar territory.
That being said I'm not poo-pooing the 5.0. It's badass. It has more potential than the 15 year old 4.2 (surprise?). It's 800cc bigger. It is a very good engine with few teething problems for a clean sheet design. But teething problems exist, even if small numbers and therefore I stand behind my opinion that the 5.0 is not as reliable as the old tech, fully developed, anemic (LOL) 4.2. Like I've said before I'd happily own a face-lift 2012 and later if I could afford it.
Oh and less supercharger whine on the 5.0? Sorry mate, that's a giant flying leap backward!!!!
How thin is my veil of 510hp jealousy?
Last edited by flyc2c; 04-02-2016 at 07:06 AM.
#22
fly no real argument here just looking for the data. Seeing some complaints here I assume there are some failures but to get a hand around whether it is a reliability issue I think needs to be supported by more info. I realize it will be hard to obtain as Jaguar as with any mfg. doesn't want to let this info out. I don't know how many 5.0L engines Jaguar has manufactured so it will be hard to determine how many of them have had a failed WP. Same with the form here , how many of us have 5.0 cars and out of that how many have had WP failures.
#23
#24
It would be interesting to have a poll and find out how many are 4.2 and how many are 5.0 owners.
#25
While I'll happily agree that the 5.0 is a step forward in technology that alone does not by default make it more reliable. Even if failure rates are low in the 5.0 (H2O pumps, chain tensioners/phasers/etc) there are failures. This forum proves it. If someone has to drop $3000 in 30k miles for "maintenance" then I would not call that "reliable". I'm not saying all will do this but based on this forum I'd say it happens more on the 5.0 than the 4.2. My 1986 Toyota 22R had 232,000 miles on it when I replaced the original water pump. That's reliable. Maybe it's a pilot thing. I'd rather fly a 5 year old airplane than a new design fresh off the drafting table!
Anyway, bottomline is something different, the saboteur devil sitting on your shoulders is getting so desperate that it shows. Dont let him keep you from the love of your life, a 5.0.
No the 5.0 not in the same league as 4.2, the 4.2 was developed by cash strapped under-funded Jaguar. The 5.0 was the result of putting all resources allocated from Ford into engine dev- a first for Jaguar.
#26
#27
The 'devil's' argument is that the less performance you have the more reliable it will be. Sure, that logic lands you with a Honda, and ultimately in his court as fundamentally you will be settling for all sorts of cheap thrills. Dont settle for cheap thrills get a 5.0.
I don't consider my 07 XKR cheap. Some consider me cheap. I prefer fugal.
This 'devils' argument was reliability. I've (jealously) acknowledged the superior performance.
I thought we were talking old engine design and new engine design. If a salesman came to me and said we can remove your old design, proven reliable engines and replace them with new ones that are 20% larger and 20% more powerful, but major components may fail and an increase in fuel burn? I'd stick with the old ones. But maybe a wealthier pilot who wants to get there a few minutes faster and like the thrill of more take-off thrust would.
I have no doubt a 5.0 is in my future. It has more potential than the 4.2. It was at the end of it's development cycle. There are pros and cons to that. No so with the 5.0! No doubt there's +600hp in that engine. It's only money that's keeping me from it!
I'll come to the intervention if there's beer! But you'll have to drink with me. After I get a ride in your car!
Don't take me too seriously. We're all mates here. Cheers!
Last edited by flyc2c; 04-03-2016 at 07:34 AM.
#29
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jagtoes (04-03-2016)
#30
You are on for that beer and you are buying cause you will get to drive a 5.0. I know a place in Norcross that I bet you dont.
How often does one have to throw a perfectly good working engine on a leerjet away? My jet engine mechanic buddies tell me that FAA regs require it. So how does that work into your philosophy of dont fix if it aint broke.
No its not 100 extra HP-its crossing the line from borderline high-performance to supercar territory, for no more consumption in energy.
You cant compare Honda and output per liter, those rice burners develop virtually no torque, which is the only thing that matters when it comes to excitement, and when they do its really very high into rpm range. The Jaguar is effortless power and endless pull. I want a Honda in my pressure washers and a Jaguar in my muscle car.
How often does one have to throw a perfectly good working engine on a leerjet away? My jet engine mechanic buddies tell me that FAA regs require it. So how does that work into your philosophy of dont fix if it aint broke.
No its not 100 extra HP-its crossing the line from borderline high-performance to supercar territory, for no more consumption in energy.
You cant compare Honda and output per liter, those rice burners develop virtually no torque, which is the only thing that matters when it comes to excitement, and when they do its really very high into rpm range. The Jaguar is effortless power and endless pull. I want a Honda in my pressure washers and a Jaguar in my muscle car.
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Cee Jay (08-05-2016)
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