Bored, so I nerded out on rad/stroke ratio

[rocco16v at netzero.net (L F)]

Jet lag.
Typical Scirocco affliction.

Larry
sandiego16V
  ----- Original Message ----- 
  From: Allyn 
  To: L F ; Ron Pieper ; scirocco-l@scirocco.org 
  Sent: Saturday, January 31, 2004 5:30 PM
  Subject: Re: Bored, so I nerded out on rad/stroke ratio


  > Increasing rod length (decreased rod angularity) will decrease piston
  acceleration/speed.
  > You may have gotten the two mixed up.

  > Larry

  yah, got em backwards there. just made a speed run down to jacksonville
  today, i'm not all here... yet.
  Al

    ----- Original Message ----- 
    From: Allyn
    To: Ron Pieper ; scirocco-l@scirocco.org
    Sent: Saturday, January 31, 2004 4:54 PM
    Subject: Re: Bored, so I nerded out on rad/stroke ratio


    ok, i get how the piston accel is lower with longer throws, but i always
    thought the main limit for the bottom end was the mean piston speed. issue
    being getting enough oil to keep the rings cool and the skirt lubed.
    Al

    ----- Original Message ----- 
    From: "Ron Pieper" <rapieper@yahoo.com>
    To: <scirocco-l@scirocco.org>
    Sent: Saturday, January 31, 2004 12:25 PM
    Subject: Bored, so I nerded out on rad/stroke ratio


    > Momma wanted to watch her Thursday night TV, and the kids were in bed,
  and
    it was too cold to work
    > in the garage, so with nothing else to do, I figured I'd see what the
  the
    scoop was behind varying
    > the con rod/stroke ratio.
    >
    > Gotta DIY, being me, so I did some trig in Excel and a little (very
  crude)
    derivation, I came up
    > with this:
    >
    > http://scirocco.dhs.org/cheapassron/misc/rodratio.jpg
    >
    > No units (AFA ft/s/s, etc.) but I do believe it works as a visual aid.
    The center of the graph is
    > TDC.  Obviously something is wrong with the Y axis offset, but I think
  the
    shape is right.
    >
    > This is not new news, but from what I see, it tells me that longer
    rod/stroke ratios lead to
    > overall lower piston acceleration rates (meaning less stress and higher
    revability?) and later
    > peak accleration (meaning compensations in cam (less overlap required?),
    intake, and exhaust
    > design, but what exactly I don't know).  Anyhow, some of you MatLab
  gurus
    may want to pick up on
    > this and discuss what positive impacts one could make on a NA engine.
  Oh,
    and fix my spreadsheet
    > (verrrry crude)
  http://scirocco.dhs.org/cheapassron/misc/piston_speed.xls
    >
    > Now, back to your normally scheduled discussions...
    >
    > =====
    > Cheapass Ron
    > '81 Scirocco S - "Victor Jr."  7SM
    > (2.0L 16V, GL 4-speed w/ Quaife installed, Megasquirt coming...)
    >
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