The most highly loaded component in the short block are the rods.
If we go by the stock reciprocating weight of parts we get these numbers if the motor is run to 6000 rpm.
Just going from the stock 3.750” stroke up to 4.250” will increase the already over 6700 pounds of load trying to rip the rod apart up to over 7800 pounds of load.
That makes for a 15.5% increase!
If you simply lower the reciprocating weight by 50 grams you are then down to a hair over 7500 pounds of load which is 4.2% less then what the load is with stock parts and the longer 4.250” stroke.
Conversely if you only run the motor to 5500 rpm instead of 6000 the load would back down to the 6700 pounds it was with the stock 3.750” stroke.
Loads on the reciprocating assembly go up and down by the square of the rpm, as in the loads seen at 1000 rpm are 36 times higher at 6000 rpm!!
With stock # 11 castings and that 4.250” stroke the hp numbers that the motor can make will be well nosed over by 5500 rpm anyway, so no sense in buzzing it any higher!
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs!
And he was not talking about 1/8 or 1/4 mile ETs!
1) 1940s 100% silver 4 cup tea server set.
Two dry rotted 14 x 10 Micky Thompson slicks.
1) un-mailed in gift coupon from a 1972 box of corn flakes.
Two pairs of brown leather flip flops, never seen more then 2 mph.
Education is what your left with once you forget things!
Last edited by steve25; 11-24-2021 at 07:25 PM.
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