Just remember, the combination makes power. A slightly lighter rotating mass not so much.
Just remember, the combination makes power. A slightly lighter rotating mass not so much.
If I am thking correctly (while I worry abau this nor'easter taking my partially installed new roof off tonight; what luck!): Those 2 cranks are made to balance out the same bobweight, with the same reciprocating component and the same rotating component. (The 273's piston pins are heavyyyyy to make the reciprocating weight part the same as the 318.) With that being the case, the rotational mass and rotational inertia of the crank itself (which takes energy away from the torque at the wheels under acceleration) will be fairly close to the same, so I would not expect you see any real difference in your application. It might make a difference in a very, very high end drag car.Yes you are correct. I am trying to get the lightest rotating assembly using factory pieces. If the forged 273 crank is a little lighter than the 318 cast crank. So with the lighter rods I'm using the machinest might not have to add any weight with the forged 273 crank. Does that make sense? And it will be a lighter overall package.
Just keep in mind that any lighter rotating mass will help the car go faster; if you are road racing or rallying or autocrossing, then it typically gets considered more than for drag racing. Of course, lighter flywheels is the best spot to look for reduced rotating weight.Just remember, the combination makes power. A slightly lighter rotating mass not so much.
Agreed but we aren't talking lightweight 2 ring pistons, aluminum rods and billet knife edge cranks or even race cars here. My point is that the op should concentrate more on the combination and less on the factory pieces to make it a few grams lighter.Just keep in mind that any lighter rotating mass will help the car go faster; if you are road racing or rallying or autocrossing, then it typically gets considered more than for drag racing. Of course, lighter flywheels is the best spot to look for reduced rotating weight.
Agreed but we aren't talking lightweight 2 ring pistons, aluminum rods and billet knife edge cranks or even race cars here. My point is that the op should concentrate more on the combination and less on the factory pieces to make it a few grams lighter.