Hmm...Speaking of exotica. Maybe not in a way we can share here...Quote:
Originally Posted by PhilipA
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Hmm...Speaking of exotica. Maybe not in a way we can share here...Quote:
Originally Posted by PhilipA
The problem isn't the timing chains as such but the tensioners and guides. The early versions had tensioners with steel pins pushing on aluminium backed guides. The aluminium wore down and the guide couldn't hold the tension.
My previous D4 V8 had these guides but was still nice and quiet when I sold it with over 200K km and it was sold again with over 250K. This engine had regular oil changes at half the interval recommended.
My current SCV8 had the timing chains and guides replaced when it developed a noisy top end due to a worn exhaust valve tip and bucket. It had the steel guides and everything was fine. This was an expensive repair as I changed all the exhaust valves, timing chains and guides, coolant hoses, water pump, supercharger bearings, supercharger coupling, supercharger oil, 5 injectors and all the associated gaskets.
I'm not sure why the valve tip wore but the car had been serviced to at the recommended intervals before I bought it.
Greame Cooper Automotive did the work for me and did an awesome job sourcing parts, dismantling and putting it back together. They had done a timing chains on a few NA V8s before but not a SCV8. The car has been faultless since then.
I haven't been able to find any others with worn valves so I may have been unlucky.
I have heard of big ends failing and a LR workshop manager I know who worked for a dealership in Sydney attributed them to a certain demographic who overreved the engines and/or held them at sustained high rpms.
I understand that! With the M62 BMW emgine in the early L322s, it's the plastic faced guides that break up when the chains become a little loose and flail about. I replaced the tensioner mid-last year and that did reduce the flailing on start up before oil pressure was attained and the tensioner became active - a fairly easy job.Quote:
Originally Posted by Geedublya
These are highly strung, high performance interference engines. Any weakness in the timing chain area is unacceptable, especially at the price point, as any failure is catastrophic, and very expensive. It makes potential resale values nosedive. And it's unnecessary. Honda has been showing the world that reliability in extremely complex engines is a possibility for decades. Toyota can do it. Other divisions of Ford can do it. Heck, even modern day Ferrari can do it.Quote:
Originally Posted by Geedublya
Given the performance nature of the engine people will drive them using the revs available. If the engine cannot cope with this I would contend that it is unfit for it's purpose, or, at the very least, it's marketing.Quote:
Originally Posted by Geedublya
I'm sure that when it's working properly it is a lovely engine, and highly tempting to own. Within it's warranty period, a warranty whose fine print I would study carefully. No way would I buy a secondhand one, no matter how regular and frequent the servicing.
However, if someone else was footing the bills I'd have one in a heartbeat.
That's one reason I try to limit the revs on my M62.Quote:
Originally Posted by Tins
I've been in JSP's (on this forum) supercharged L322 in Adelaide and, WOW! [thumbsupbig]