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On Thu, 8 Feb 2007 16:58:39 -0500, "Morgans" <jessmorgan@charter.net>
wrote:
>
>"Peter Dohm" <lefty133@bellsouth.net> wrote
>
>> I'm not quite sure why, but rumors suggest that the _modern_ overhead cam
>> and multi-valve engines are far less tolerant of sloppy or deferred
>> maintenance than most older designs.
>
>If this is the engine I'm thinking of, there has to be a special low coking
>oil used, or the cam chain tensioner suddenly loses its ability to maintain
>tension, and the whole thing flies apart, catastrophically for the further
>running of the engine. Regular oil, even changed every 3K miles will not
>cut it.
From what the Chrysler mechanics (and independents) I have talked to
about this say, following the extreme driving schedule using either
top quality dino or synthetic oil solves the problem. On these engines
(2.7) there is NO driving that isn't "extreme" as far as the oil is
concerned. They can, and will, go over 300,00km with proper care. Are
they fussy? without a doubt - but PROPERLY maintained, they CAN be
relatively reliable. Would I put one in a plane????? I would have to think
long and hard on that one - I think there are too many other, better
alternatives.
>
>That does not sound like a normal tolerance for maintenance, but rather, a
>design with poor engineering. I feel equal apprehension involving all of
>Chrysler's engines, until proven otherwise.
>
>I've know other people with major engine problems with engines that have
>had regular oil changes, and all recommended maintenance. There are more
>than isolated instances of engine failure, IMHO.
>
>Ford and GM, and a few other manufacturers have had extensive experience
>racing their engines. Weak links appear, and are corrected. Racing more
>closely duplicates the types of abuse we subject our engines to, in
>airplanes.
>
>Until Chrysler starts racing more engine lines, I do not see my confidence
>level in their engines changing very much.
--
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Re: 60 degree Mopar V6 for homebuilt?
