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09-23-2009, 10:29 PM
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#21
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Internet Tough Guy
Join Date: Jun 2008
Posts: 1,545
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Quote:
Originally Posted by enkeivette
I wasn't saying each cylinder was 6 or 8, I was saying each cylinder is 6/8ths (fraction) = .75
But I do see your point, I was confused on what it was. You're saying that since there are 3 compression strokes for each revolution of the output shaft, that you need to count each one which would be 1.3L/2 x 3 (compression) x 2 rotors which is 3.9L
I can see that line of thinking. But it's sort of not fair, because you're using the back of the rotor and counting it as displacement while you'd never count the area behind a piston as displacement obviously. So there is more effective intake charge displacement while there is less actual displacement.  |
When you calculate the displacement of a regular motor you are assuming that all the cylinders are at bottom dead center at the same time. This is something that is not possible. I'm saying that there are 8 chambers in my car, each is ~ .75 Liters, assuming that they are all at .75L at the same time you get a 6.0L car.
Thus to be far in a RX-7 there are 2 lobes with three chambers for a total of 6 chamber. With a maximum displacement of 1.3 L each it (by the historical standard) is a 7.8L motor. |
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09-23-2009, 10:31 PM
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#22
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Internet Tough Guy
Join Date: Jun 2008
Posts: 1,545
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I would agree with the 3.9L, but why are you dividing it by 2?
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09-23-2009, 10:35 PM
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#23
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Super Moderator
Join Date: Dec 2007
Posts: 6,850
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Quote:
Originally Posted by BADDASSC6
I would agree with the 3.9L, but why are you dividing it by 2?
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Two rotors, so each moves 1.3L/2 with one induction stroke.
So each chamber is 3.9L/2 total, while the motor is 3.9L total.
__________________
I <3 forced induction.
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09-23-2009, 10:36 PM
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#24
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Internet Tough Guy
Join Date: Jun 2008
Posts: 1,545
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ok, I concur 3.9L.
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09-23-2009, 10:40 PM
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#25
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Super Moderator
Join Date: Dec 2007
Posts: 6,850
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Quote:
Originally Posted by BADDASSC6
ok, I concur 3.9L.
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  Should we let Mazda know?
__________________
I <3 forced induction.
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09-23-2009, 10:43 PM
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#26
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Internet Tough Guy
Join Date: Jun 2008
Posts: 1,545
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Honestly the best thing about those motors are:
1) With all that exhaust energy they can spin anything. I mean they can spin a turbo off idle like a v8.
2) Only Japanese manufacturer to win LeMans.
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09-23-2009, 10:45 PM
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#27
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Graphics B*tch
Join Date: Dec 2006
Posts: 2,197
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__________________
Adam
'13 Ford Fusion SE (2.0L EcoBoost)(Conor)
'03 Zinc Yellow Mach 1(Yazmine)
290HP / 305TQ
1/4 mile ET: 13.28 @ 101MPH (1.867 60')
'99 White F-150 (4.6L)(Bud Jr.)-gone but never forgotten
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09-23-2009, 11:29 PM
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#28
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I, Vettezuki
Join Date: Feb 2006
Posts: 14,754
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Quote:
Originally Posted by BADDASSC6
Honestly the best thing about those motors are:
1) With all that exhaust energy they can spin anything. I mean they can spin a turbo off idle like a v8.
2) Only Japanese manufacturer to win LeMans.
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The guy who bought our 13B is adapting them for light plane use. In addition to their packaging and smoothness advantages, apparently they just don't fail in the durability testing they use for determining reliability in aircraft usage.
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09-24-2009, 09:59 AM
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#29
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Neanderthal
Join Date: Mar 2008
Posts: 5,320
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Quote:
Originally Posted by Vettezuki
The guy who bought our 13B is adapting them for light plane use. In addition to their packaging and smoothness advantages, apparently they just don't fail in the durability testing they use for determining reliability in aircraft usage.
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I knew a guy 25 years ago that did that. What was the first name of the guy that got your motor?
__________________
64 Vette Roadster 400 ci
1990 F150 351 ci SuperCharged
48 Harley Pan Head 76 ci
2016 Nissan Altma
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09-24-2009, 12:09 PM
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#30
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I, Vettezuki
Join Date: Feb 2006
Posts: 14,754
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Quote:
Originally Posted by BRUTAL64
I knew a guy 25 years ago that did that. What was the first name of the guy that got your motor?
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I think it was Roland.
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