> As far as added safety if you happen to "Over-Rev" the engine - hardly.
Redline is 4800 rpms with a stock valvetrain for many
late model magnum engines right... so an "Over-Rev"
would constitute any rpms over 4800. The article states:
"5400 is borderline, 5800 to much and 6000 being the kiss of death."
It stands to reason if 5400 is borderline with a stock
valvetrain that the same rpms can be achieved safely
with a good rocker package and accessories. At least
this theory appears to be true with my own Dak and I
believe this is what Bernd may have been saying as this
would allow for 600 more stable rpms. Any comments from
other DML'ers about this rpm range being achieved safely
many times over? With the full rocker upgrade of course.
GS -
Shane wrote:
> As far as added safety if you happen to "Over-Rev" the engine - hardly.
> Aluminum ones might absorb some valvetrain harmonics over the stock stamped
> steel ones and possibly keep the valvetrain geometry slightly more accurate but
> there are more serious things to consider. I quote the following from Mopar
> Muscle - July 1997 issue - article titled: "Inductive Reasoning"
>
> "The other concern centers around the lifters. They're real heavy and overcome
> the strength of
> the lifter bore casting at high RPM. Spinning a Magnum to 5400 RPM is
> borderline, 5800 RPM too
> much, and above 6000 RPM can be the kiss of death. What happens is the heavy
> lifters crack the
> casting, start to wobble and the valve train self-destructs. When the valve
> train starts to go
> bonkers, you'll notice an upper RPM vibration, almost like the engine is out of
> balance. Either
> limit your shift points, buy a Fluidampr, or pray somebody develops a
> lightweight lifter for the
> Magnum."
>
> No known upgrade will help this problem. This is also the reason lots of people
> have to re-bore
> and sleeve the lifter bores (costly). Very common on Mopar small-blocks due to
> this design
> flaw. If you have ever seen a bare shortblock (any year smallblock will do) -
> it isn't hard to
> see where the weakest part of the whole block is - the lifter galleys. Compare
> them with the
> race version block from MP - almost all the difference is there.
>
> If you are going to put technical info out here for 700+ members to read - you
> might want to check the accuracy of your statements first.
>
> Latr,
>
> Shane
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