|
it always was fairly universal to grind performance cranks on or just below the bottom size limit to make them nice and loose
i've also read about swapping yank V8 cranks and blocks around, thus using a big main journal crank ground down in a small main journal block to save friction.
anyone seriously into x/flows or BDA's will know that cranks and rods can be bought for them with narrower big end journals to save friction.
when bmw introduced there ETA ecomony 2.7 straight six, they ran the cam in only 4 cam bearings rather than 7 as in the rest of that engines range to cut down on friction. this made me wonder about shortening tha jack shaft in a twin cam or BDA to do away with the rear bearing.
back in the 60's bill blydstien used to lower the oil pressure in his 2.3 slant 4's to save parasitic losses from the oil pump.
|