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R/S ratio

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Old 02-12-2007, 01:03 PM
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Default Re: R/S ratio

Originally Posted by MADMAX

Wrong Walter, think about it. Unless the crankshaft is not rotating in a circular fashion or the connecting rods magically change length throughout the crankshaft rotation, they are the same.



Lmao.. I made the same joke, about JDM VTEC Conrods. But plenty of sources online agree that a lower rod/stroke ratio leads to more TDC dwell and less BDC dwell. I don't particularly agree, but there's too many places agreeing with Walter here for me to say otherwise.
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Old 02-12-2007, 01:20 PM
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TDC dwell = BDC dwell
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Old 02-12-2007, 06:08 PM
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stroke only decreases the time a piston will spend its time in x amount of length of cyl walls.
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Old 02-12-2007, 07:47 PM
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it's the same to tune cams in both case?
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Old 02-18-2007, 06:15 PM
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Default Re: R/S ratio

Originally Posted by Secondaries
Lmao.. I made the same joke, about JDM VTEC Conrods. But plenty of sources online agree that a lower rod/stroke ratio leads to more TDC dwell and less BDC dwell. I don't particularly agree, but there's too many places agreeing with Walter here for me to say otherwise.

Post some.


Originally Posted by Joseph Davis
TDC dwell = BDC dwell

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Old 02-18-2007, 08:43 PM
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sources agree? or sources prove?
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Old 02-18-2007, 08:48 PM
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Originally Posted by wafflesincars
R/S ratio is a rich man's N/A game, for turbo cars its a lie.
You parroted me earlier in this thread, is my word not good enough? I mean, since you obviously can't think in three dimensions about simple rotational dynamics.

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Old 02-18-2007, 08:51 PM
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One word for those that honestly want to know, but don't have all the cards: trigonometry.

Here, a second: triangles.

A third and fourth: common sense.
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Old 02-18-2007, 08:58 PM
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parroted? o rly? I'm sure I read that on D-series.org, but I'm probably wrong. And seeing as the amount of dwell being different between BDC and TDC, this is physically impossible for the engine, seeing as it would neccisitate a variable stroke crankshaft or con-rod. Jah?
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Old 02-18-2007, 10:05 PM
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The difference between you and me is that sometimes I can remember everything I ever read, and everything I ever said, and I know where it's at so it takes me a minute fifteen to find it with HMT search engine broken. :P

https://www.homemadeturbo.com/forum/...9013#msg789013

In the morning I expect I won't remember how to tie my shoes. Again.
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