Does that make them more stable to handle the boost of a turbo? 300HP @ the flywheel from a 2.2L(?) H-4 sounds pretty hefty
Not necessarily. That has more to do with how strong the engine is built. Also, turbo cars usually have a lot of torque instead of crazy high-end RPM.
Having a nicely balanced engine helps you rev high (like a F1 car), but it doesn't necessarily help it handle the torque. Having a free-revving engine with light parts isn't going to hold up well under a lot of boost.
I've never heard anything about piston firing order or material superiority. The hemispherical head IIRC had good flow characteristics, but the burn was pretty slow. (advance... advance... advance... KABOOM)
ZV, I think torque (given the same volumetric efficiency) depends entirely on displacement. For example, the 3L F1 engines have to make about 230lb-ft of torque to make 900HP at 20kRPM (random numbers off the top of my head), while the stroke is extremely low to enable the engine to rev up that high.
Having owned at one point or another every flavor of engine (except a Hemi... Marketing crap anyway), I'll have to say my very favorite engine so far was the I6 in my 76 280z. I soooo wish I still had that car.
American V8s are sweet too, but they have to be built right. Typical 70's - 80's cars had the engines so detuned that they are jokes.
By far the smoothest engine was the one in my 78 Subaru. Pancake (boxer) engine, of course.
American V8s are sweet too, but they have to be built right. Typical 70's - 80's cars had the engines so detuned that they are jokes.
By far the smoothest engine was the one in my 78 Subaru. Pancake (boxer) engine, of course.
Zenmervolt
Elite member
- Oct 22, 2000
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Nope, longer stroke will give more low-RPM torque for a given displacement with all else being equal. A couple of reasons: First, the crank throws are longer, which gives the piston more leverage on the crankshaft, second, smaller valves necessary for a smaller bore cylinder increase the intake and exhaust charge velocity, which aids low-RPM torque.Originally posted by: Howard
I've never heard anything about piston firing order or material superiority. The hemispherical head IIRC had good flow characteristics, but the burn was pretty slow. (advance... advance... advance... KABOOM)
ZV, I think torque (given the same volumetric efficiency) depends entirely on displacement. For example, the 3L F1 engines have to make about 230lb-ft of torque to make 900HP at 20kRPM (random numbers off the top of my head), while the stroke is extremely low to enable the engine to rev up that high.
Now, a larger displacement engine will make more torque than a smaller one (all else being equal), but the bore/stroke ratio plays a huge part in torque too.
ZV
Toastedlightly
Diamond Member
- Aug 7, 2004
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It was the correct answer (for the most part).
I'm not going to write a big long post for someone who isn't going to have any idea what the fvck I'm talking about.
Maybe if I typed faster .....
"crank throws are longer" If the stroke is reduced, the bore is increased. Still the same amount of torque.Originally posted by: Zenmervolt
Nope, longer stroke will give more low-RPM torque for a given displacement with all else being equal. A couple of reasons: First, the crank throws are longer, which gives the piston more leverage on the crankshaft, second, smaller valves necessary for a smaller bore cylinder increase the intake and exhaust charge velocity, which aids low-RPM torque.Originally posted by: Howard
I've never heard anything about piston firing order or material superiority. The hemispherical head IIRC had good flow characteristics, but the burn was pretty slow. (advance... advance... advance... KABOOM)
ZV, I think torque (given the same volumetric efficiency) depends entirely on displacement. For example, the 3L F1 engines have to make about 230lb-ft of torque to make 900HP at 20kRPM (random numbers off the top of my head), while the stroke is extremely low to enable the engine to rev up that high.
Now, a larger displacement engine will make more torque than a smaller one (all else being equal), but the bore/stroke ratio plays a huge part in torque too.
ZV
"smaller valves" But I'd already stipulated the same volumetric efficiency, which is affected by the velocity of the flowing gases, no?
Zenmervolt
Elite member
- Oct 22, 2000
- 24,514
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Increased bore decreases the stroke and thereby decreases the leverage on the crank. Long stroke means more leverage and more low-end torque.
Note that every single post of mine has specified _low end_ torque. Torque where it's useful.
ZV
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