Tensioners
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tensioners and nickasill
I was wondering if the moderators could do a more formal poll?
Its interesting that some of you still have the nickasil blocks and some even have the tensioners......some high mileage as well.
So it seems not all those blocks went bad.
Nickasil has been around for awhile. I raced for 30 years and when I was getting ready to retire engine builders were starting to do this with race engines but it was expensive..........
Its interesting that some of you still have the nickasil blocks and some even have the tensioners......some high mileage as well.
So it seems not all those blocks went bad.
Nickasil has been around for awhile. I raced for 30 years and when I was getting ready to retire engine builders were starting to do this with race engines but it was expensive..........
#12
Please Clarify
One poster somewhere said that all engines manufactured after August of 2000 were not Nikasil blocks. Could somebody clarify this if they know more about this.
This would mean that most if not all 2001 engines were iron lined and not Nikasil.
Having said that would mean 4.0 engines found in 2001-2003 are not Nikasil blocks as many on this forum claim....
This is good information to know with those wanting to purchase those year cars?
This is probably motivated of course by the savings in money without having to move up to a 2004 4.2 engine.......
This would mean that most if not all 2001 engines were iron lined and not Nikasil.
Having said that would mean 4.0 engines found in 2001-2003 are not Nikasil blocks as many on this forum claim....
This is good information to know with those wanting to purchase those year cars?
This is probably motivated of course by the savings in money without having to move up to a 2004 4.2 engine.......
#13
So r u sure?
You have a nikasil block........? I doubt you even have one if what was mentioned in the past is true.....a 2001 model 4.0 should be a conventional iron liner?
#15
Meaning engines built before this date were being installed in year 2000 cars and 2001?
#16
Engine number is the determining factor. The exact number has been exhaustively discussed in past threads. It may even be in on of the stickies.
#17
If I was offered the choice of a brand new Nik block or steel one, I'd go for the Nik.
Tighter tolerances, harder bore lining, now no sh*t sulphur fuel additives and cheapo supermarket fuel from Venezuela, Formula One developed coating, no measurable wear after 2-300,000 miles, a lighter bare weight bock - it all adds up to a great development in engine technology, pity the sulphur fuel was it's cryptonite, damn shame that cost not just Jaguar pots of cash, but BMW etc that used the process while the bum fuel was around....
I've seen failed Nik linings, not pretty, chunks missing to tiny bits, all scrap. A compression test/leak down test - look for oil in the obvious places are the tests to carry out with a suspect unit.
Any AJ-V8 manufactured before August 13th midnight 2001 (from memory!) will need the timing update...
Last edited by Sean B; 01-01-2013 at 07:56 AM.
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Johnny Rocket (01-02-2013)
#18
193K miles on my original Nikasil block. I have original tranny and all. Car has no oil leaks or fluid leaks of any kind and still has power to throw you back in the seat. I onlyy have changed my secondary tensioners and probably will change out the VVT unit soon as it ticks until I hit 1500 RPMs then you hear the whirrr and it kicks in and engine is quiet. Trying thicker weight oil next oil change to see if that makes a difference.
#19
193K miles on my original Nikasil block. I have original tranny and all. Car has no oil leaks or fluid leaks of any kind and still has power to throw you back in the seat. I onlyy have changed my secondary tensioners and probably will change out the VVT unit soon as it ticks until I hit 1500 RPMs then you hear the whirrr and it kicks in and engine is quiet. Trying thicker weight oil next oil change to see if that makes a difference.
The problem is lack of enough oil pressure for the VVT units at idle on a hot engine with low oil viscosity-hence the later higher-capacity oil pump. On earlier engines the VVT noise can be reduced by using thicker engine oils.
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coastaljag98 (01-01-2013)
#20