aBieker

I was wondering if anyone had ever seen a diagram of an s5 engine housing (or any other 13b for that matter... I can always interpolate the values a little) with the various compression levels listed as the rotor turns through the housing (so this would probably include degree markings as well)?

I found some diagrams of timing related values, but none that were exactly what I was looking for. The hardest part of this for me, conceptually, is that as the rotor turns, the compression is not really linear like it would be with a piston in a cylinder. The area between the rotor and housing changes in all kinds of wacky ways that, having only taken entry level calculus, I am not prepared to tackle on my own.

On a related note, does anyone know how many degrees of overlap exist between the stock intake and exhaust ports?

I'm curious about all of this as it relates to engine porting. How far you can port one before losing compression... how much compression would be lost doing different things, etc. All kinds of wacky stuff. Sorry to be so abstract because I know that most of you just like to get more HP out of your engines, but I'm just a curious kinda guy and would like to learn as much as possible about all of this for curiousity's sake.
Thanks in advance for any info.

BTW, this would be a really good opportunity for someone with WAY too much time on their hands to create a complete explanation of port and ignition timing for the archive.

hugues

it's pretty much all covered in the kenchi yamamoto book on the rotary engine but that's 150 pages long ... and it's a tough read if you don't know trigonometry that well.

there might be other theoretical books out there but that's the one I know of ...

iougs-

aBieker

I'm alright with Trig... it's the Calculus that I'm not so good at.

Marcus_F

You didn't say whether tubo or NA, so here's both:
Intake Open:
Primary for an NA 32 degrees ATDC
Primary for a TII 45 degrees ATDC
Secondary for both 32 degrees ATDC
Aux 45 degrees ATDC
Intake Close:
Primary for an NA 40 degrees ABDC
Primary for a TII 50 degrees ABDC
Secondary for an NA 30 degrees ABDC
Secondary for a TII 50 degress ABDC
Aux 80 degrees ABDC
Exhaust Open: 75 degrees BBDC
Exhaust Close: 48 degrees ATDC

So that's 3 degrees on the TII and 16 on the NA.