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Car Forum / MINI / December 2003

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Diff Ratios

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Robin Simpson - 11 Dec 2003 21:45 GMT
Who can work this out for me.im no good at maths

Currantly running 4.3 diff at 7500revs Strait cut 3 Syncro box 65in circum tyres drop gears 1.1
if i ran                   4.1 what revs would it reduce or
                             3.9 what revs would it do
Thanks
Robin Simpson

http://homepages.paradise.net.nz/robinsim/
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Graham - 12 Dec 2003 12:13 GMT
First of all Robin, do you think you could maybe post in plain text
rather than html? Cos this is what it looks like to a text newsreader:

Robin wrote:

------=_NextPart_000_0018_01C3C09D.18DAD960
Content-Type: text/html;
       charset="Windows-1252"
Content-Transfer-Encoding: quoted-printable

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=3DContent-Type content=3D"text/html; =
charset=3Dwindows-1252">
<META content=3D"MSHTML 6.00.2800.1276" name=3DGENERATOR>
<STYLE></STYLE>
</HEAD>
<BODY style=3D"COLOR: #000000; FONT-FAMILY: Arial" =
bgColor=3D#ffffff><LABEL=20
id=3DHbSession SessionId=3D"2621512342"></LABEL>
<DIV><FONT size=3D2>Who can work this out for me.im no good at =
maths</FONT></DIV>
<DIV><FONT size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT size=3D2>Currantly running 4.3 diff at 7500revs Strait cut 3
=
Syncro box=20
65in circum tyres drop gears 1.1</FONT></DIV>
<DIV><FONT size=3D2>if i=20
ran&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
4.1 what revs&nbsp;would it reduce or</FONT></DIV>
<DIV><FONT=20
size=3D2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
3.9 what revs would it do</FONT></DIV>
<DIV><FONT size=3D2>Thanks</FONT></DIV>
<DIV><FONT size=3D2>Robin Simpson</FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT size=3D2><A=20
href=3D"http://homepages.paradise.net.nz/robinsim/">http://homepages.para=
dise.net.nz/robinsim/</A></FONT></DIV>
<P></P></BODY></HTML>

------=_NextPart_000_0018_01C3C09D.18DAD960--

Now, to answer your question, if I can find it in there:

<DIV><FONT size=3D2>Currantly running 4.3 diff at 7500revs Strait cut 3
=
Syncro box=20
65in circum tyres drop gears 1.1</FONT></DIV>
<DIV><FONT size=3D2>if i=20
ran&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
4.1 what revs&nbsp;would it reduce or</FONT></DIV>
<DIV><FONT=20
size=3D2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
3.9 what revs would it do

If you're running 7500rpm on a 4.3diff, then to go the same speed on a
3.9diff you will be doing 3.9 / 4.3 x 7500rpm = 6800rpm
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