Posted by Brian on 4/6/2008, 6:58 pm, in reply to "Re: 4.88:1, 5.13:1 etc Differential Ratios"
72.208.224.148
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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