Hello, i am new here.

I want to sell this chromed rotor but i want to know the exact specification of it. I wanna learn from it to know for the future whoch rotor is from which engine. Would be nice if anyone could help

 

welcome to the board.

need a couple better photos. some things that would be helpful are: the apexes and the recesses. also, you can measure some things as well.
- rotor width
- apex seal slot
- weight

 

Should add a picture of the combustion chamber area on the rotor. Could also measure the combustion chamber depth to determine compression ratio.

 

+1, i see 12 roll pins so its 1986 and later, but can't tell any more than that

 

Sorry for the late reply. Here is a picture.
5,5 cm width (combustion chamber)
9,5 cm length (combustion chamber)

The total width of the rotor is 8,9 cm

 

2mm apex seals with a cast recess = S4. Depth of the recess tells you the compression

pic is from the S5 book, so an S4 will be slightly different, but close enough

 

Thank you for the answer. Can i ask you from where you get these informations? Especially the image. I want to gather as much information as possible.

I think i understoood what you said in your reply but i will study the theme further.