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**Talicoabilk** · 07-25-2012, 02:33 PM

EACH ROTOR HAS 3 SIDES... THERE'S ONLY ONE CYLINDER " "THE EPITRICHOID" PER ROTOR AND ONE POWER STROKE PER ROTATION...

Don't shout - it's rude!

To clarify, each side of the rotor fires one every revolution, but there are three power 'strokes' per revolution.
the actual swept volume of a 13B is, IIRC 1308cc, but as it's not possible to directly compare it to either four or 2 stroke engines (or any other, comes to that), it's often compared to a 4 stroke piston engine of twice the swept area.

Last time I looked, our Motorsport Asociation had an equivalence factor of 1.7:1, with a 1 litre swept volume rotary being equvalent to a 1700cc 4 stroke engine.

Just to confuse things, the crank actually turns slower than the rotor.

Rotor tip wear was, indeed, a huge problem in the past and still can rear it's ugly head - the Ro80 effectively bankrupted Opel due to warranty claims for the engine.

07-25-2012, 02:33 PM	#2
Talicoabilk Join Date Nov 2005 Posts 440 Senior Member	EACH ROTOR HAS 3 SIDES... THERE'S ONLY ONE CYLINDER " "THE EPITRICHOID" PER ROTOR AND ONE POWER STROKE PER ROTATION... Don't shout - it's rude! To clarify, each side of the rotor fires one every revolution, but there are three power 'strokes' per revolution. the actual swept volume of a 13B is, IIRC 1308cc, but as it's not possible to directly compare it to either four or 2 stroke engines (or any other, comes to that), it's often compared to a 4 stroke piston engine of twice the swept area. Last time I looked, our Motorsport Asociation had an equivalence factor of 1.7:1, with a 1 litre swept volume rotary being equvalent to a 1700cc 4 stroke engine. Just to confuse things, the crank actually turns slower than the rotor. Rotor tip wear was, indeed, a huge problem in the past and still can rear it's ugly head - the Ro80 effectively bankrupted Opel due to warranty claims for the engine.
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