Speedo question

[Willie]

I need help, I have aquired a speedo allegedly from a 1962-64 1098 Minor.
It is Bronze faced, has only oil/ignition/and high beam lights, is marked to
90mph, and has no voltage stabilizer fittings. The number is SN4477/30, can
anyone identify this please? Particularly you '62-'64 owners.

[newagetraveller]

Probably not the answer you want but I always thought that ...

948cc Minors had a gold faced speedo and 1098cc Minors had a black faced speedo.

[Onne]

from 1954 onwards they had the gold faced one, replacing the asymetric series MM style dash, but there were some transitional models in the early series V

[Judge]

I need help, I have aquired a speedo allegedly from a 1962-64 1098 Minor.
It is Bronze faced, has only oil/ignition/and high beam lights, is marked to
90mph, and has no voltage stabilizer fittings. The number is SN4477/30, can
anyone identify this please? Particularly you '62-'64 owners.

Have a look at this link previously supplied by Cam, it might help.

http://potteries.mmoc.org.uk/Identify.htm

[Willie]

Judge...ok thanks. Newage....the first two years of the 1098 cars had a
bronze faced speedo.
Judge.....very useful site but,unfortunately it doesn't tell me anything that I
need. The SN7744/30 number does not appear there or in any of my other
reference sources so I need info from someone who has that number on their
car. It probably comes from a car with an optional diff ratio or perhaps from
other than a Minor.

[Cam]

I think I have that one in mine. Have a look at: http://potteries.mmoc.org.uk/Members_Ca ... 6B_025.JPG

Mine is a 1098, 4.22:1, September 1963.

[Judge]

I think I have that one in mine. Have a look at: http://potteries.mmoc.org.uk/Members_Ca ... 6B_025.JPG

Mine is a 1098, 4.22:1, September 1963.

I can't be sure Cam, but yours looks the same as the one I have in my '64 convertible, ie S/No: 4477/30 (80?)

[Judge]

I have just realised that this is the one Willie is looking for. Unfortunately in the message I read, March 19th 10.03 AM, he put it down as S/No: 7744/30.

[Willie]

CAM...magic, that's the one so it is from an early 1098, thanks. I am intrigued
by the fact that there is no voltage stabilizer fitted which raises the question
as to wether the first two years of the 1098 did NOT change the tank sender
unit as on the later cars. I will find out when I try it on my car.
Judge.....SN4477/30 is what I meant....what a basic mistake, must engage brain more often.

[Judge]

CAM...magic, that's the one so it is from an early 1098, thanks. I am intrigued
by the fact that there is no voltage stabilizer fitted which raises the question
as to wether the first two years of the 1098 did NOT change the tank sender
unit as on the later cars. I will find out when I try it on my car.
Judge.....SN4477/30 is what I meant....what a basic mistake, must engage brain more often.

I thought it might have been, but not being sure I didn't post my originally intended reply. Never mind, you have the answer now.

[Cam]

CAM...magic, that's the one so it is from an early 1098, thanks. I am intrigued by the fact that there is no voltage stabilizer fitted which raises the questionas to wether the first two years of the 1098 did NOT change the tank sender unit as on the later cars. I will find out when I try it on my car.
Judge.....SN4477/30 is what I meant....what a basic mistake, must engage brain more often.

Willie, my tank sender is screw terminal and NOT lucar. I don't know if that helps?

[Willie]

CAM, that is why I am intrigued. In the interest of giving accurate advice in
future I will check that the bronze faced 1098 speedos of 1962-64 with the
nutted terminal on the matching tank sender unit work ok with the later sender unit from the black faced speedos(with the Lucar connector). Since I
have both types to hand I can check it out easily.

[Cam]

I would be interested in the results.

[Willie]

OK, I've done some testing and it appears that ALL bronze faced speedos
(948cc and the 1962-64 1098 cars) use the tank sender unit with a nut on the
terminal. All black faced speedos use the sender unit with a Lucar push-on
terminal. They are not interchangeable. The fuel gauge will read in reverse
with the wrong sender as the senders are configured differently i.e. the nut
type sender reads high resistance when the float is at 'full' position whereas
the push-on type sender reads 'short' in the 'full' position. The nut type fuel
gauges read instantly when the ignition is turned on, the push-on types read
slowly,due,I imagine, to the presence of the voltage stabilizer on the later
cars.

[rayofleamington]

the push-on types read
slowly,due,I imagine, to the presence of the voltage stabilizer on the later
cars.

Hi Willie,
for added confusion/assistance, I used a black faced speedo on my 1954 SII (I thought it was from a 1962 948cc saloon but it could have been from an K reg LCV) with the original SII sender (non Lucar). The guage read instantaneously (e.g. fuel level reading changed on corners, potholes, bumps acceleration etc.. ) but otherwise ok.
I may be going senile but I really didn't think that the speedo was bronze!

I always presumed it was the gauge that made the damping action, not the voltage supply, however, I may be completely wrong on that.

If I can find a decent pic of my 54 that shows a bronze speedo, then that explains the non damped gauge and it was probaby from the 62 saloon, also explaining why it worked with the non lucar fuel sender.

[lowedb]

I always presumed it was the gauge that made the damping action, not the voltage supply, however, I may be completely wrong on that.

No, I think you are right.
The older type were magnetic (coil / magnet) where the later ones were bimetal strips heated by a coil of wire. They move slowly because it takes time to heat up This gives natural damping, and of course they are cheap.

[Cam]

Yes, I agree. My late ('69) black faced speedo gauge takes a while to get a proper reading whereas the '63's bronze faced speedo gauge reads virtually instantly.

[Willie]

RAY..your black faced speed was NOT from a 948cc Minor. I think you are right about the 'slow' reaction being due to the differing operating systems of
the fuel gauges. The later thermal types just take longer to react.