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Re: [Healeys] Lightened flywheels

To: Healey List <healeys@autox.team.net>
Subject: Re: [Healeys] Lightened flywheels
From: Bob Haskell via Healeys <healeys@autox.team.net>
Date: Tue, 7 Sep 2021 21:00:34 -0400
Delivered-to: mharc@autox.team.net
Delivered-to: healeys@autox.team.net
References: <CAKkXjqMWpoGgGceXCAZLp8r-yfPJbu8Y-k1FPK0Oag5g=vJPtw@mail.gmail.com> <000001d7a425$4709aa80$d51cff80$@shaw.ca> <CAB3i7LLYfW7Vf8fhCd418m-tjbCikc+pV2Tt5HNJZ0r0_3OFoQ@mail.gmail.com> <CAKkXjqMc_YfapH==Qdu4ULiryTyU1wjmXYoYXgp_eU2w4hGFBg@mail.gmail.com> <CAPTa0B55x0ZOyFU0WMpN_jRn7Ct=+AW5L+qAfK7eTHU-ipHuSw@mail.gmail.com> <221031832.3863391.1631058762378@mail.yahoo.com> <CAPTa0B5QV4R=LvcVGS+guv+2kOUAGL6G8hapmRdCFw6XPHwFvw@mail.gmail.com>
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    <font size="-1"><font face="Courier 10 Pitch">More nitpicking: gas
        tank capacity is 12 imperial gallons or 14.4 US gallons. 
:)</font></font><br>
    <pre class="moz-signature" cols="72">Cheers,

Bob Haskell
Austin Healey 3000 BN7/BT7 registrar</pre>
    <div class="moz-cite-prefix">On 9/7/21 8:39 PM, Michael Oritt wrote:<br>
    </div>
    <blockquote type="cite"
cite="mid:CAPTa0B5QV4R=LvcVGS+guv+2kOUAGL6G8hapmRdCFw6XPHwFvw@mail.gmail.com">
      <meta http-equiv="content-type" content="text/html; charset=UTF-8">
      <div dir="ltr">
        <div class="gmail_default" style="color:#3333ff">Keith--</div>
        <div class="gmail_default" style="color:#3333ff"><br>
        </div>
        <div class="gmail_default" style="color:#3333ff">Right you are
          (and wrong I am) but 6 x 6.3=20+/-which is still more than
          5...</div>
        <div class="gmail_default" style="color:#3333ff"><br>
        </div>
        <div class="gmail_default" style="color:#3333ff">Best--Michael
          Oritt</div>
        <div class="gmail_default" style="color:#3333ff"><br>
        </div>
        <div class="gmail_default" style="color:#3333ff"><br>
        </div>
      </div>
      <br>
      <div class="gmail_quote">
        <div dir="ltr" class="gmail_attr">On Tue, Sep 7, 2021 at 7:53 PM
          llennep--- via Healeys &lt;<a
            href="mailto:healeys@autox.team.net"; 
moz-do-not-send="true">healeys@autox.team.net</a>&gt;
          wrote:<br>
        </div>
        <blockquote class="gmail_quote" style="margin:0px 0px 0px
          0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
          <div style="color:black;font:10pt 
Arial,Helvetica,sans-serif">Nitpicking
            me here . . ..  .. .
            <div>gallon of gasoline weighs a tad over 6 lbs</div>
            <div>:)<br>
              <br>
              <br>
              <div
                
style="font-family:helvetica,arial;font-size:10pt;color:black"><font
                  size="2">-----Original Message-----<br>
                  From: Michael Oritt via Healeys &lt;<a
                    href="mailto:healeys@autox.team.net"; target="_blank"
                    moz-do-not-send="true">healeys@autox.team.net</a>&gt;<br>
                  To: richard mayor &lt;<a
                    href="mailto:boyracer466@gmail.com"; target="_blank"
                    moz-do-not-send="true">boyracer466@gmail.com</a>&gt;<br>
                  Cc: healeys &lt;<a
                    href="mailto:healeys@autox.team.net"; target="_blank"
                    moz-do-not-send="true">healeys@autox.team.net</a>&gt;<br>
                  Sent: Tue, Sep 7, 2021 7:40 pm<br>
                  Subject: Re: [Healeys] Lightened flywheels<br>
                  <br>
                  <div id="gmail-m_-6446079295951788294yiv1063698908">
                    <div>
                      <div dir="ltr">
                        <div><span style="color:rgb(51,51,255)">I
                            hesitate to nitpick but as to the statement
                            that </span><i><font color="#0000ff">"4 to
                              5 pounds off vehicle weight is really only
                              the equivalent of half a tank of 
fuel" </font> </i><font
                            color="#0000ff">the l</font><font
                            color="#3333ff">ast time I looked an AH fuel
                            tank holds about 12 gallons and since
                            gasoline weighs approximately 7.5 lbs per
                            gallon half a tank weighs about 45 
pounds.  </font><span
                            style="color:rgb(51,51,255)">The defense
                            rests....</span></div>
                        <div><font color="#3333ff"><br clear="none">
                          </font></div>
                        <div><font color="#3333ff">Best--Michael 
Oritt  </font></div>
                      </div>
                      <br clear="none">
                      <div>
                        <div
                          
id="gmail-m_-6446079295951788294yiv1063698908yqtfd54840">
                          <div dir="ltr">On Tue, Sep 7, 2021 at 6:00 PM
                            richard mayor via Healeys &lt;<a
                              shape="rect"
                              href="mailto:healeys@autox.team.net";
                              rel="noreferrer noopener" target="_blank"
                              
moz-do-not-send="true">healeys@autox.team.net</a>&gt;
                            wrote:<br clear="none">
                          </div>
                        </div>
                        <blockquote style="margin:0px 0px 0px
                          0.8ex;border-left:1px solid
                          rgb(204,204,204);padding-left:1ex">
                          <div
                            
id="gmail-m_-6446079295951788294yiv1063698908yqtfd20741">
                            <div dir="ltr">
                              <div>Michael, <br clear="none">
                              </div>
                              <div><br clear="none">
                              </div>
                              <div>Comparing the weight of fuel in the
                                gas tank to rotational mass is like
                                comparing apples to bananas. <br
                                  clear="none">
                              </div>
                              <div><br clear="none">
                              </div>
                              <div>Richard<br clear="none">
                              </div>
                              <div><br clear="none">
                              </div>
                            </div>
                            <br clear="none">
                            <div>
                              <div dir="ltr">On Tue, Sep 7, 2021 at 2:24
                                PM Michael Salter &lt;<a shape="rect"
                                  href="mailto:michaelsalter@gmail.com";
                                  rel="noreferrer noopener"
                                  target="_blank" 
moz-do-not-send="true">michaelsalter@gmail.com</a>&gt;
                                wrote:<br clear="none">
                              </div>
                              <blockquote style="margin:0px 0px 0px
                                0.8ex;border-left:1px solid
                                rgb(204,204,204);padding-left:1ex">
                                <div>The total mass of the flywheel is
                                  not completely relevant insofar as
                                  engine moment of inertia is concerned.
                                  <div>What is important is the mass
                                    removed times the square of the
                                    radius, so just how much weight has
                                    been removed per se is not
                                    important. </div>
                                  <div>Secondly removing rotational
                                    inertia is not always the best thing
                                    to do, if it was you can be assured
                                    that manufacturers would be all over
                                    it as a way to save money.</div>
                                  <div>The rotational mass is often
                                    designed in to protect the drive
                                    train, in particular the gearbox.</div>
                                  <div>Read this:  <a shape="rect"
href="https://www.netbug.net/blogmichael/2017/01/03/austin-healey-100-crank-failures/";
                                      rel="noreferrer noopener"
                                      target="_blank"
                                      
moz-do-not-send="true">https://www.netbug.net/blogmichael/2017/01/03/austin-healey-100-crank-failures/</a></div>
                                  <div>Thirdly lightening a flywheel in
                                    of itself has very little effect on
                                    acceleration.  An engine with a
                                    lightened flywheel may accelerate to
                                    6000 RPM 1 - 2 seconds more quickly
                                    but that doesn't necessarily equate
                                    to 1-2 seconds faster to 60 MPH. You
                                    may be able to shift marginally
                                    faster if the gearbox can stand the
                                    extra loads and the 4 to 5 pounds
                                    off vehicle weight is really only
                                    the equivalent of half a tank of
                                    fuel. (Who ever notices that their
                                    car accelerates more quickly with a
                                    half full gas tank).</div>
                                  <div><br clear="none">
                                  </div>
                                  <div>Just sayin'</div>
                                  <div><br clear="none">
                                  </div>
                                  <div>M</div>
                                </div>
                                <br clear="none">
                                <div>
                                  <div dir="ltr">On Tue., Sep. 7, 2021,
                                    4:17 p.m. Earl Kagna via Healeys,
                                    &lt;<a shape="rect"
                                      href="mailto:healeys@autox.team.net";
                                      rel="noreferrer noopener"
                                      target="_blank"
                                      
moz-do-not-send="true">healeys@autox.team.net</a>&gt;
                                    wrote:<br clear="none">
                                  </div>
                                  <blockquote style="margin:0px 0px 0px
                                    0.8ex;border-left:1px solid
                                    rgb(204,204,204);padding-left:1ex">
                                    <div lang="EN-US">
                                      <div>
                                        <div>I have Bill Bolton
                                          lightened flywheels in both my
                                          Healeys.  According to Kent
                                          Lambert, who took over Bills
                                          Healey business awhile back,
                                          the stock weight (6 cyl) is
                                          28.5 pounds, and Bills
                                          machining program reduced them
                                          to 24.</div>
                                        <div> </div>
                                        <div>Both of my cars run just
                                          fine, no problems at all in
                                          the 20 + or so years that Iâ??ve
                                          had them installed.</div>
                                        <div> </div>
                                        <div>Earl Kagna</div>
                                        <div>Victoria BC</div>
                                        <div>BJ8, BT7 tri-carb</div>
                                        <div> </div>
                                        <div> </div>
                                        <div> </div>
                                        <div
                                          style="border-color:rgb(225,225,225)
                                          currentcolor
                                          currentcolor;border-style:solid
                                          none none;border-width:1pt
                                          medium medium;padding:3pt 0in
                                          0in">
                                          <div><b>From:</b> Healeys &lt;<a
                                              shape="rect"
                                              
href="mailto:healeys-bounces@autox.team.net";
                                              rel="noreferrer noopener"
                                              target="_blank"
                                              
moz-do-not-send="true">healeys-bounces@autox.team.net</a>&gt;
                                            <b>On Behalf Of </b>richard
                                            mayor<br clear="none">
                                            <b>Sent:</b> Tuesday,
                                            September 7, 2021 10:23 AM<br
                                              clear="none">
                                            <b>To:</b> healeys &lt;<a
                                              shape="rect"
                                              
href="mailto:healeys@autox.team.net";
                                              rel="noreferrer noopener"
                                              target="_blank"
                                              
moz-do-not-send="true">healeys@autox.team.net</a>&gt;<br
                                              clear="none">
                                            <b>Subject:</b> [Healeys]
                                            Lightened flywheels</div>
                                        </div>
                                        <div> </div>
                                        <div>
                                          <div>
                                            <div>6 cylinder flywheels
                                              vary slightly but are all
                                              generally in the 29 pound
                                              range. Very aggressive
                                              machine work can get the
                                              weight down to the 22-23
                                              pound range. </div>
                                          </div>
                                          <div>
                                            <div>How much weight you
                                              take off will affect your
                                              driving style. To maintain
                                              the feel of a stock Healey
                                              while still improving the
                                              engines response, I
                                              suggest removing no more
                                              than 3 pounds. </div>
                                          </div>
                                          <div>
                                            <div> </div>
                                          </div>
                                          <div>
                                            <div>Richard   </div>
                                          </div>
                                        </div>
                                      </div>
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                      <div dir="ltr"><font 
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      -- <br>
      <div dir="ltr" class="gmail_signature"><font 
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      <br>
      <fieldset class="mimeAttachmentHeader"></fieldset>
      <pre class="moz-quote-pre" 
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