[DeTomaso] Ford 392 rev limit?

Will Kooiman will.kooiman at gmail.com
Sat Sep 7 09:21:58 EDT 2013


Corey,

I think you pretty much nailed it.

--
Will





On 9/7/13 1:33 AM, "Corey Price" <coreyjprice at gmail.com> wrote:

>I don't want to beat a dead horse.
>
>I thought that there are a lot of factors in determining the maximum safe
>RPM of any engine, with some being:
>
>1.  Valve float.
>2.  Rod bolt capacity and fatigue limit.  I understand the greatest load
>on the rods is actually when the piston reverses direction and the piston
>is pulled toward the crank, putting the rod in tension.  This is directly
>related to the piston momentum (speed-related).
>3.  Crank strength and toughness, meaning the fatigue limit and the
>tensile strength at a given strain.  Most cast cranks have limited
>toughness, which is why forged cranks are used for their increased
>capacity to deform without breaking.  Again, this is related to the
>piston momentum (speed-related).
>4.  Piston capacity to resist the cyclical loading.
>5.  Block strength and fatigue limit.
>6.  Oiling system capacities and limitations.
>7.  Cylinder wall strength.
>
>Did I forget anything?  Any of these could be the limiting factor as I
>understand it.
>
>Corey
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