Triumph GT6 And Spitfire Message Board: Re: 4.88:1, 5.13:1 etc Differential Ratios

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Re: 4.88:1, 5.13:1 etc Differential Ratios

Posted by JohnD on 4/7/2008, 4:23 pm, in reply to "Re: 4.88:1, 5.13:1 etc Differential Ratios"
86.156.103.231

An ELECTRIC Spitfire!

Been done before, so you're not alone. ASk on the TTN, as there was a thread about one there. Built years ago as a school project IIRC, or else Steve Abbot here: http://www.mail-archive.com/spitfires@autox.team.net/msg11135.html

John
--Previous Message--
: Many electric motors work very well above
: 5,000 rpm and many AC motors are able
: to spin much much faster than that, so
: a nice low geared diff would be great
: for a one-speed electric vehicle.
:
: You're right, I will probably have a
: really hard time finding a Herald
: today. I knew of two in a junk yard,
: but those have been crushed along with
: thousands of other very cool old cars.
: This is one of the reasons that I also
: asked if an after-market supplier
: existed for low differential gears. If
: this were a Chevy I could probably pick
: from a long list of differential gear
: ratios from about 20 different
: suppliers, but I don't know of anyone
: that does this for Triumphs.
:
: I got the information from the internet
: machine. Here's the link.
:
:
: http://www.triumphspitfire.com/diff.html
:
: --Previous Message--
: Brian,
: Where did you get that information?
: A 1500 had a 3.63 diff.
: The lowest diff ratio I've ever seen on
: a Triumph was the very first 948cc
: Herald, 4.875. I think the Courier van
: had a 4.55. You would be most unlikely
: to find one of those today.
:
: But why do you want such an ultralow
: geared diff? Most people want at least
: a higher geared one, or an overdrive.
: A 4.875 would mean you needed about
: 5000rpm to keep at 60mph.
: JOhn
:
: --Previous Message--
: I would like to install a set of lower
: rear end gears in my 79 1500. I noticed
: that the Herald Sedan had a 4.88:1 and
: the coup had a 4.55. Is it possible to
: use these gear sets in my 1500? Or is
: the pinion shaft too small, etc? I
: would imagine that someone makes gears
: for competition too.
:
:
:
:
:

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--Previous Message-- : : An ELECTRIC Spitfire! : : Been done before, so you're not alone. : ASk on the TTN, as there was a thread : about one there. Built years ago as a : school project IIRC, or else Steve : Abbot here: : http://www.mail-archive.com/spitfires@autox.team.net/msg11135.html : : John : --Previous Message-- : Many electric motors work very well : above : 5,000 rpm and many AC motors are able : to spin much much faster than that, so : a nice low geared diff would be great : for a one-speed electric vehicle. : : You're right, I will probably have a : really hard time finding a Herald : today. I knew of two in a junk yard, : but those have been crushed along with : thousands of other very cool old cars. : This is one of the reasons that I also : asked if an after-market supplier : existed for low differential gears. If : this were a Chevy I could probably pick : from a long list of differential gear : ratios from about 20 different : suppliers, but I don't know of anyone : that does this for Triumphs. : : I got the information from the internet : machine. Here's the link. : : : : http://www.triumphspitfire.com/diff.html : : --Previous Message-- : Brian, : Where did you get that information? : A 1500 had a 3.63 diff. : The lowest diff ratio I've ever seen on : a Triumph was the very first 948cc : Herald, 4.875. I think the Courier van : had a 4.55. You would be most unlikely : to find one of those today. : : But why do you want such an ultralow : geared diff? Most people want at least : a higher geared one, or an overdrive. : A 4.875 would mean you needed about : 5000rpm to keep at 60mph. : JOhn : : --Previous Message-- : I would like to install a set of lower : rear end gears in my 79 1500. I noticed : that the Herald Sedan had a 4.88:1 and : the coup had a 4.55. Is it possible to : use these gear sets in my 1500? Or is : the pinion shaft too small, etc? I : would imagine that someone makes gears : for competition too. : : : : : : :

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