[bluedino]

That sounds fantastic but it means nothing in practice. It's like something you'd hear in a "Engineering Explained" video, but with no real-world application. There's so much more that goes into an engine that it doesn't matter.

Again, it's a myth.

Similarly, there was always the debate over rod length (in the same displacement engines). You use the same crankshaft but the piston has the wrist pin located higher. The longer rod was always supposed to make "more torque" because of the angle but that ended up not being the case.

You can verify this buy putting engines together with different bores and strokes that are roughly equal displacements, and with the same heads/cam on them, they will make identical power. Picture something like a 3.50" bore and 4.00" stroke, and vice versa. Look up someone like Richard Holdener on YouTube for actual data. Displacement is displacement, it doesn't really matter how you make it.

Bore is what would make you more power after a certain point, anyway. You get more surface area to fit larger valves, etc. But again, using the same heads (that aren't shrouding the smaller bores), either combination of bore/stroke will make the same power throughout the rev range.

Then you get into things like piston speed and all that but none of that matters unless you're talking about a race engine. And when you are, they'll just rebuild it more often so they don't care how long it lasts.

Here's another read:

https://rehermorrison.com/tech-talk-53-big-bore-or-long-stro...

[unclad5968]

> Displacement is displacement, it doesn't really matter how you make it.

If this were the case wouldnt all similar displacement engines have the same torque curve?

[bluedino]

If you could fit the same intake manifold, cylinder head, and camshaft on them. There's things other than displacement that determine the shape of the torque curve.

Compare a Suzuki G13B 1300 vs a Suzuki Hayabusa 1300 for example.