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Cause for incorrect RPM

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drmini in aust

Post subject: Re: Cause for incorrect RPM

Posted: Tue Mar 31, 2015 3:25 pm

religious status

Joined: Fri Mar 19, 2004 6:19 pm
Posts: 39762
Location: near Baulkham Hills, NSW

drmini in aust wrote:

9YaTaH wrote:

drmini in aust wrote:

What speedo is it? I have a 200KMH Minispares Cooper S one in mine, it is reading slower and s l o w e r with age. Only done 20K Km or so, IMO these aftermarket pretend Smiths speedos are rubbish.

Wear bigger boots or get a big moon go pedal Doc...that'll stop it going slower

It's getting a Moke 140KMH (800 turns/km) one. I should be able to wind that off the clock in 3rd gear.. on a track, of course! :mrgreen:

[edit]
I pulled the 200KMH speedo out today and I think found the problem...
The threaded bit of the diecast housing where the cable nut screws on has broken right off. The bronze bush inside has moved outwards, probably bringing the magnet bar with it. Less magnetism into needle drum = speed reads low.
Moke speedo is mounted now instead.

Update to above- the threaded bit of diecast off the speedo body is stuck tight inside my cable, we cannot remove it without destroying the nut, so it's new cable time!

[edit] Couldn't reach the bottom cable nut because of the LCB. So the radiator came out, easy access then.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:

Last edited by drmini in aust on Sat Apr 04, 2015 9:36 pm, edited 1 time in total.

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9YaTaH

Post subject: Re: Cause for incorrect RPM

Posted: Tue Mar 31, 2015 8:58 pm

1360cc

Joined: Sun Apr 11, 2004 11:32 am
Posts: 12390
Location: Sthrn HiLoLands, NSW, Australia

A picture would be nice Doc...but it sounds to me like the speedo head is stuffed as well...

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drmini in aust

Post subject: Re: Cause for incorrect RPM

Posted: Tue Mar 31, 2015 9:11 pm

religious status

Joined: Fri Mar 19, 2004 6:19 pm
Posts: 39762
Location: near Baulkham Hills, NSW

9YaTaH wrote:

A picture would be nice Doc...but it sounds to me like the speedo head is stuffed as well...

Mick, I'll thread the body OD and make a brass adaptor for the cable, and it might live again.
It was working fine, no needle waving, just under-reading speed (odometer was reading correct though).
You are welcome to re-live your chosen trade on it if you wish.
I'm not stripping it, speedos I've stripped don't seem to go back together!

_________________
DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:

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9YaTaH

Post subject: Re: Cause for incorrect RPM

Posted: Wed Apr 01, 2015 8:27 am

1360cc

Joined: Sun Apr 11, 2004 11:32 am
Posts: 12390
Location: Sthrn HiLoLands, NSW, Australia

drmini in aust wrote:

9YaTaH wrote:

A picture would be nice Doc...but it sounds to me like the speedo head is stuffed as well...

Eye sea...maybe after Easter Bathurst mate :arrow:

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