Quote:
Originally Posted by MR-3vz
I wouldnt use a 3s crank in a 5s block because that would defeat the purpose going with a 5s block. I would infact use a 5s crank in a 3s block and that would net a displacement increase of ~.1L and would allow the use of the 3s rods with some work, and would net a better R/S ratio and allow for better revving of the motor. The main benifit of going with the 5s block is the 2.2L of displacement.
-J
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No, maybe for YOU, the benefit would be adding displacement. Believe it or not...there are people that would prefer to use a 5S block for it's strength, not displacement. The slightly bigger bore is nil as far as increasing displacement.
And as far as rr's are concerned, a 3S crank in a 5S block is no different than a 3sgte. They have the same effective rod length of 137.9mm giving a rr of 1.6
Doing what you said, 3S block with 5S crank with 3S rods...yes that gives more displacment, but at the cost of a
worse rr of 1.5, not
better as you said. And add to that, a 5S block and 5S crank has the
same rr as a stroked 3S block, 1.5