Quote:
Originally Posted by RallyBob
Don't forget that Frank Aragona told me and Jack that the stock crank was very reliable until about 9500 rpms. Then they failed repeatedly. So he went the billet route to spin 10,500 reliably.
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OK,
If the stock crankshaft is good to, say, 9,400RPM,
and you want a reliable 8,500 RPM,
then we need lighter/stronger connecting rods and bolts,
lighter/stronger pistons and,
lighter/stronger piston pins
to lessen the rapidly rising kenetic forces.
I know that our stock piston/pin w/rings (1#, 6.4oz)
and rod (1#,58oz)
weigh 2#, 12.2 oz EACH!(or 1250-1260kg)
I remember that the CP pistons/pins and Eagle rods weighed alot less.
And we (if our pockets are deep enough
) can buy them.
Next we come to the valves/springs/keepers/retainers, as far as weight being an issue.
Are titanium valves/springs(?)/retainers/keepers available?
If we cut the weight of all of these things in half, then you should be able to raise the RPM limit by a pretty big margin.
(IMHO)
Tom