13B Displacement
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Joined: Feb 2002
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From: Portland, OR
13B Displacement
Ever since I've learned about RX-7s I've heard that the 13B-REW in them is 1.3L. Now I keep hearing that it's actually 1.3L per rotor (or something) putting them up to 2.6L. My questions is this: WTF?
Old [Sch|F]ool
Joined: May 2001
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From: Cleveland, Ohio, USA
Ratary diplacement is measured per revolution, similar to a two-cycle piston engine. 4-stroke piston engines are measured per two revolutions.
What this means is a 1.3l rotary is analogous to a 1.3l two-cycle or a 2.6l four-cycle engine.
What this means is a 1.3l rotary is analogous to a 1.3l two-cycle or a 2.6l four-cycle engine.
Rotary Enthusiast
Joined: Dec 2001
Posts: 1,209
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From: Delaware
most compare to 4-stroke piston engines, that are rated based on air displaced in one full cycle, which takes 2 revs.
start with 2L acura, 2L of air pumped in 2 revs (at 100% pumping efficiency)
the rotary displacement is listed for one rev, so a 1.3L pumps 2.6L in 2 revs.
the 2 stroke is also rated for one rev, so old smokey 750 cc kawasaki pumps 1.5L in 2 revs.
start with 2L acura, 2L of air pumped in 2 revs (at 100% pumping efficiency)
the rotary displacement is listed for one rev, so a 1.3L pumps 2.6L in 2 revs.
the 2 stroke is also rated for one rev, so old smokey 750 cc kawasaki pumps 1.5L in 2 revs.
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LongDuck
1st Generation Specific (1979-1985)
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Oct 7, 2015 08:12 PM
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