glemmers

I'm deriving the equations for the throchodial chamber shape/volume on a rotary engine and have a few questions.

Does anyone know:
1. What is the rotor width on a 13b? (chamber width)

2. What is the apex seal to apex seal distance (i.e. if you think of the rotor as an equilateral triangle, what is the length for each side)? Or I could back calculate this if anyone knows the distance across the throchodial chamber at it's narrowest section?

3. What are the gear tooth counts on the stationary and rotor gears? I believe the rotor is a 51 tooth, and the stationary is a 34 tooth.

4. What are the diametrial pitch for the rotor and stationary gears? (metric or English)

5. This is a long shot, but does anyone know the volumetric efficiency of a 13b vs. rpm. Also, any correction factors for apex seal material?

I already have the equations derived, but need the above info as inputs. I am creating a spreadsheet to calculate chamber fill vs. eccentric shape rotation. This can be used (I hope) to better understand port timing and shape.

Any info would be greatly appreciated.

Glenn
'93 CYM

KevinK2

R=105mm, rotor center to apex seal point
w=80mm, chamber width
e=.59"

teeth and pitch dia are not needed, only need to know 3 revs of crank for 1 rev of rotor, and figure right pitch diameter pair.

peejay

The gears have a 2:3 ratio, the stationary gear has 2n teeth and the rotor gear has 3n teeth, where n is some number. 34/51 fits, 2*17 is 34 and 3*17 is 51. (Honestly I don't know the numbers because for any of our type wankel the ratio is and will be 2:3)

glemmers

Thanks guys. Your help is apreciated.

Glenn