Morris Minor Owners Club

I've always been led to believe that with a standard late 1098 minor, fitting a ford type 9 with a 8*22 speedo drive made the speedo pretty much spot on.

I also thought, and had been told, that the 8* was most commonly in type 9's so all you have to do is change the driven gear to a 22 tooth.

In enquiring about a recon box for Bluey today, i asked if it could be fitted with an 8*22 in the recon process, and have been told that 8* is very rare, and he can't source one for me.

Is 8*22 correct? or have all of these type 9's with 22 tooth drives fitted actually been fitted into some other number (7* or 9*?).

If it's true and 8*22 is correct, and 8*'s are unavailable, is there any other ratio that comes to the same or close?

Does anyone know the speedo ratio of a standard rib case box that i can try and find ford gears to suit?

Or does anyone know what ratio they've got in their box and how innaccurate it makes theirs?

Help! I need to come up with a ratio soon to get my box completed!

Hi Chris
Sorry I know nothing about type 9 boxes.
The speedo reduction in a standard ribbed morris box is 2.6/1.
1 rev speedo cable = 2.6 revs output shaft.

Regards Win

thanks win, that's really helpfull!

so 2.6:1 is what i'm aiming for.

with an 8 tooth drive, ideally i'd want 20.8 tooth driven.
with a 9 tooth drive, idealy i'd want 23.4 tooth driven.

I wonder if there's a 10 tooth drive, as then a 26 tooth driven would be perfect!

or if there's a 7 tooth drive, 18.2 teeth would be right, so if there's a 7*18 that could be pretty close!

thanks for that win! you might have just cracked it!

You could always try speedy cables for your speedo to be recallibrated. Unless you can get the correct drive cheaper.

apparently 8* is the highest available, and 22t is the lowest available, so 8*22 is the closest i can get to 2.6:1, with a ratio of 2.75:1. It'll have to do!

He's managed to 'pull in a favour' and find me an 8* drive, i had no idea they were so hard to come by.

The speedo will be out, but not by much hopefully. I can't see me going to the trouble of getting the speedo recalibrated, Bluey's speedo has never been right, but has always been close, and once i work out how 'out' it is i'm fine, and can mentally recalibrate. At the moment the speedo is way out with the 5 speed, so i'd like it to be closer, just to get my mileage somewhere near right!

I might have a go at working out the optimim tpm for the speedo and see if i can find a speedo to suit, but i'd rather keep her original speedo, even if nothing else is original!

Better leave a generous safe braking distance, if your going to be dividing your speedo reading by 5.76923%. on a regular basis.

I am sure you will cope.

Regards Win

oops it should be multiply, your speedo will show lower, I think.

Regards Win.

once i work out what my speedo says at an actual 30, 40, 50, 60 and 70 then i just have to remember that, and it's quite easy after a few days!

5.7% will be a lot better than the ~20% at the moment!

If you know the speedo requirement (from the numbers on the front or from the original spec) and you have the gearbox output (can be measured by moving the car over a set distance) you can order the correct angle drive or converter:

http://www.speedograph-richfield.com/ht ... arbox.html

No reason not to have both speed and distance reading correctly!