Thread: How does Crank/Rod/Piston Weight affect mpg?
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Old February 17th, 2015, 04:54 PM
patrickk1 patrickk1 is offline
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Default How does Crank/Rod/Piston Weight affect mpg?
I just started a build on a 1963 GMC with a 305 V6. My original plan was a cummins 12v, but when I picked up a truck with a good running 305 v6, i decided I would build that motor. So far, I am modifying a gm 5 1/8 bellhousing to nv4500 trans adapter and also the sm420 bellhousing so I can use the nv4500 5spd trans with the 305. I though about re-building a 305 or 351M and lightening it drastically while doing an offset grind on the crankshaft to allow the use of different lighter rods and also pickup more stroke.

The more I thought about driving at relatively steady speeds, the more I started to think that maybe the heavy rotating assembly may help mpg as it has much more stored energy vs a lightweight setup. What do you think about this? Most of my driving is done on the highway.

Patrick
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