Type-I in teener?, Why not? Options

[D1A3]

Watched RIDES tonight on INHD and it was all about the 550 Spyder replicas. While I was watching, I started wondering why we could not put a high performance Type-I engine in our teeners.

What are the limitations? Any reason people are not doing it?

BTW, I did search for this in the archives and did not come up with much...

[Rand]

Hope I'm not (IMG:style_emoticons/default/dead horse.gif)

But this is good learning.

My take is all the talk about exhaust pipe direction, and the flow having to make a 90 degree turn between the intake and exhaust ports, yada yada, is mostly nonsense.

Regarding head flow, it's not like a smooth flow that is inhibited by a direction change. Some of the logic here might work if you just opened all the valves and forced air through under constant pressure, but that's not what happens. It gets sucked in through the head. It gets pushed out through the head. Saying that making it go in a straight line would increase flow is rubbish. After all, there's a compression stroke in there. And an explosion. That's not flow. Flow out the exhaust port happens when the piston pushes the exhaust out. (Of course the size and shape of the port and exhaust matters, but that's not what I'm talking about.)

Thanks all. While there's been some madness, the discussion helps bring some understanding. (IMG:style_emoticons/default/beerchug.gif)