Dutton Kit Cars and their owners
So I've got to a point where I need to make a decision on the diff but on checking them today I seem to have a bewildering range of ratio's. I assume that the numbers stamped into the crown wheel are part numbers and that a segment is the number of teeth on the pinion and another the crown wheel.
This being the case I have the following...
Now working from these numbers I would hazard a guess that the 10-39 is actually a 3.9:1 (3.89:1?)
That makes the 9-35 a 3.88:1 and the 11-39 a 3.54:1.
Bearing in mind i will be using a type 3 box and a 1630 xflow should I fit the 3.54:1?
She is Polish, works in an old peoples home, just right for Dutton owners :-)) her name is Erin Mental, which worries me !!
The 3.54 will work with an xflo if you're not interested in acceleration/performance, it wont improve fuel economy since its the Duttons awful aerodynamics that affect FC most. Remember the 3.54 was only available in pinto engined escorts for a good reason. If its only pulling around 3500 rev.min in fourth at 70mph then you'll likely be in third a lot at speeds below 60mph Though it pains me to say it if you want cruising speeds with low engine speed then fit a Rover V8, at lease it'll sound cool.