CrossFlow vs. Looper

[imported_IL_Glastron]

okay, I understand HOW to tell the difference between them, and all that but can someone explain to me WHAT the difference is? And what does it all mean?

Is it called a looper b/c of the 'looper pistons' ??

Why 2 different styles? Im confused

Mike

 

[Cricket Too]

Re: CrossFlow vs. Looper

IL......It has to do with the way the exhaust is scavenged from the combustion chamber upon a new fuel charge entering.

A cross-flow has a "bump" on the top of the piston and the incoming fuel charge hits it and changes direction causing a certain kind of swirl to push out the exhaust from the last combustion stroke.

A Looper or loop charged engine uses a "flat" piston head and is ported differently so by causing the incoming fuel/oil charge to "loop" around and push (scavenge) the exahaust from the last combustion stroke.

If you can already tell which is which by looking at the pistons, then you can kind of get an idea of how it works. There is a link somewhere, that I saw once, that actually animates how both a looper and cross-flow work. I'll see if I can find it.

 

[Dhadley]

Re: CrossFlow vs. Looper

On a "crossflow" the fuel comes in beside the piston in the "by-pass" area. It the goes thru the intake port and across the dome basically.

On a "looper" the fuel charge comes in thru the bottom of the piston (or a hole in the piston) and makes a loop thru the intake ports and across the dome.

That looping or swirling of the fuel charge allsows for a more complete, efficient burn. Which in turn produces more power.

 

[ezeke]

Re: CrossFlow vs. Looper

Bill Kelly has a good article on that subject. Copy the following link to your browser without the quotation marks:

"http://www.maxrules.com/fixtheory2.html"