Question on port matching

Thanks. But! Even though it was a really good video, I have one point of disagreement with the videographer. The floor doesn’t move or provide energy. Resistance, yes! Resistance! I see where that can be seen or likened to movement.

Should you find a video within the cylinder head showing your side, I’d be much more in minded to flip my position on which is better. Shy of a back to back dyno test with a listing of port mismatch amounts going both ways….. I still think the fuel & air charge crashing into the cylinder head is worse.

It also makes me wonder, not only what differences would show up on a .010, .100, 1/4”, but also at different power levels and engine sizes. On both points of view of course! Ow my mind is wondering a bit deeper and it just makes me want to experiment. Now if I only had a dyno!


I won’t be able to find any video of that happening in a port. But fluid dynamics is fluid dynamics. It doesn’t matter if it’s in a port or anything else.

Edit: I see what you are struggling with. The fuel and air do not crash into the port wall, they shear off of it. There isn’t any crashing there. I may be able to find some video of that. It may take me a bit. I’m back home and off the phone so it will be easier to look around YouTube.