Shifting RPM's?

[coolcat]

Do you have a lightweight flywheel? Lightweight flywheels will cause a loss of low end torque in most B series engine setups.

That doesn't sound right to me. I don't see how less rotational mass could make less torque.

[allmotoronly]

That doesn't sound right to me. I don't see how less rotational mass could make less torque.

here is the easiest way I can explain it without confusing people who already do not understand the concept.

Why do you think that heavy V8 engines make so much torque? Part of it is because the crank, rods, pistons, and flywheel is so heavy.

Honda's lack in torque partly because the rotating mass is so light.

HP is a product of torque, and has partly to do with how fast the engine achieves max torque. Take away weight from the rotating assembly, and max torque is achieved quicker (less torque, more HP). Now when you add bolt ons such as intake and exhaust, you gain HP and torque because the engine is able to turn quicker (by flowing more air and gas in and out of the engine) and achieve max torque faster without decreasing the weight of the rotating mass.

It is pretty complicated. Think about small light engines, and how they almost always have more HP than torque, and then think about the huge big block engines and how they almost always have more torque than HP, unless they have a very lightweight rotating assembly (Ex: Ferrari enzo engine 6.0L, 600hp, and less than 500 torque due to the fact that it uses the lightest materials in the rotating assembly of the engine.)

[chituntang]

here is the easiest way I can explain it without confusing people who already do not understand the concept.

Why do you think that heavy V8 engines make so much torque? Part of it is because the crank, rods, pistons, and flywheel is so heavy.

Honda's lack in torque partly because the rotating mass is so light.

HP is a product of torque, and has partly to do with how fast the engine achieves max torque. Take away weight from the rotating assembly, and max torque is achieved quicker (less torque, more HP). Now when you add bolt ons such as intake and exhaust, you gain HP and torque because the engine is able to turn quicker (by flowing more air and gas in and out of the engine) and achieve max torque faster without decreasing the weight of the rotating mass.

It is pretty complicated. Think about small light engines, and how they almost always have more HP than torque, and then think about the huge big block engines and how they almost always have more torque than HP, unless they have a very lightweight rotating assembly (Ex: Ferrari enzo engine 6.0L, 600hp, and less than 500 torque due to the fact that it uses the lightest materials in the rotating assembly of the engine.)

You are part right, but in another part, more displacement means more torque, no matter what (just look at b-series engines). More cylinders also helps as there are more things making power like you says.

[allmotoronly]

You are part right, but in another part, more displacement means more torque, no matter what (just look at b-series engines). More cylinders also helps as there are more things making power like you says.

well yes more displacement means more torque because it is pushing more air and fuel in and out of the engine with each turn. Also larger displacement engines usually have more weight in the crank, rods and pistons. Weight and the rate that the engine can pump air and fuel in and out are where torque is made. I was simply stating that just because an engine is a 7.0L V12 does not mean that it will make more torque than a smaller engine with heavier internals. We both know that the ferrari engine is built with the highest amount of technology and the best light weight alloy parts parts, which is why it can rev so high and so fast. That doesn't mean that it will make more torque than a 350 Chevy with bolt ons.