It seems most common for '74' Minor four speed gearboxes to be marked with a 4/17 speedometer ratio but some are marked 3/12. I assume 4/17 is Morris Minor. Is 3/12 associated with the Family Eight?
Are any other speedometer ratios seen on '74' gearboxes ?
Speedometer Ratios on Four Speed Gearboxes
Moderators: Ian Grace, Will Grace
-
- Posts: 186
- Joined: Mon Nov 20, 2006 10:37 am
-
- Posts: 161
- Joined: Sat Dec 02, 2006 4:44 pm
- Location: Bedfordshire UK
Re: Speedometer Ratios on Four Speed Gearboxes
That has just triggered my memory, the 4spd Hornet box in my Minor has 3/12 ratio.
Trevor.
Trevor.
-
- Posts: 186
- Joined: Mon Nov 20, 2006 10:37 am
Re: Speedometer Ratios on Four Speed Gearboxes
The difference between 3/12 and 4/17 viewed simply as fractions does not seem very significant. Is it possible a change in wheel size might have been a factor?
Re: Speedometer Ratios on Four Speed Gearboxes
My 1933 season McEvoy has 3/12, and this must have been standard for the season. So is it that the 4-speed boxes were 3/12 and the 3-speed boxes were 4/17?
But then I guess I should have learned by now that life is never that simple.
But then I guess I should have learned by now that life is never that simple.
Re: Speedometer Ratios on Four Speed Gearboxes
Could it be that 33 Minors had 19 inch wheels and 34 Minors had 18 inch wheels.
Re: Speedometer Ratios on Four Speed Gearboxes
That is exactly correct.
-
- Posts: 186
- Joined: Mon Nov 20, 2006 10:37 am
Re: Speedometer Ratios on Four Speed Gearboxes
I assume three speeds are 4/17 (is this marked somewhere?) but as you can see four speeds vary. Right hand example is a synchromesh version. I think the one on the left might be yours Ian (I cannot recall where I found the image).Could it be that the non synchromesh four speed was considered more 'sporty' for the McEvoy ? I have never experienced the synchromesh version but I think it is said to be a bit slower in changing gear. Has anyone experience of both?
Re: Speedometer Ratios on Four Speed Gearboxes
Sam,
The syncro box was only available on the Minor for the 1934 season, and that's why my '33 season McEvoy has the 4-speed crash box.
It does look like my box, but I'm in the office and the box is in the garage. I'l check tonight.
The syncro box was only available on the Minor for the 1934 season, and that's why my '33 season McEvoy has the 4-speed crash box.
It does look like my box, but I'm in the office and the box is in the garage. I'l check tonight.
Re: Speedometer Ratios on Four Speed Gearboxes
Yup - that's my gearbox.