REDLINE ON A 3.4L DOHC Idling 747

[Andrew K. Mattei]

>Hmmm...we're running a 4.165 bore with 3.480 stroke--this "formula" limits
>the max RPM to just over 6890. The driver doesn't even shift this thing
till
>7200...guess I'll have to let him know he's gone beyond the grenade limit
><G>...


> If you want a simple answer, use 24,000 divided by the stroke in inches
> as an upper limit provided the oil pump can produce 10 psi/1000 rpm.
>YMMV.


If you reread the formula in the post, it's talking about oil pump
pressure - that's 10 psi per 1000. So, at 7200 the oil pressure will be on
the downturn (won't be seeing 72 psi), but that's not saying 6890 is
necessarily the grenade limit of the motor by far... Grenade limit is
proportional to money spent... Want 9500 RPM? Shell out some big bucks, and
you'll see it with a small block V8... (nascar?)

But like Bruce said, it's prolly a imaginary whasicalit...;)

~Andrew