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What Rotor is this?

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Old 12-19-21, 08:12 PM
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What Rotor is this?

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


Old 12-23-21, 05:54 PM
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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
Old 12-25-21, 12:38 AM
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Should add a picture of the combustion chamber area on the rotor. Could also measure the combustion chamber depth to determine compression ratio.
Old 12-25-21, 09:51 AM
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Originally Posted by DR_Knight
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
Old 01-05-22, 03:22 AM
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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

Last edited by pheo; 01-05-22 at 03:25 AM.
Old 01-11-22, 09:03 AM
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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

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Old 01-13-22, 10:23 AM
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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.
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