pewe
|
| posted on 3/9/07 at 11:11 AM |
|
|
Axle ratio
Now that I'm nearing the end (build that is, although....) I've started thinking about how it will perform.
Finally started to try and work out the rear axle ratio. So 2 x wheel revolutions = 3.83 revs on the propshaft. That gives a ratio of 1.92:1.
Question - is that possible? If so it seems very low geared.
When I bought it part-built I was told it was a Mk1 Escort back axle but the Haynes Escort manual shows nothing less than 3.77:1 am I wrong or have I
missed something?
Cheers, Pewe 
|
|
|
|
|
omega 24 v6
|
| posted on 3/9/07 at 11:18 AM |
|
|
unless you've got an lsd you cant work it out this way. The wheels as well as turning the prop will be turning the planet gears in the diff
giving you a false reading at the prop. unless its from an rs its most likely a 3.89 or a 4.1 ratio although there are 3.77 in some of the vans IIRC
If it looks wrong it probably is wrong.
|
|
|
nib1980
|
| posted on 3/9/07 at 11:55 AM |
|
|
did you jack the back of the car up? if so you'd get a false reading caused by the dif working!
|
|
|
ChrisGamlin
|
| posted on 3/9/07 at 12:05 PM |
|
|
Put it on the ground, roll it forwards 2 (or preferably more) wheel revolutions then count the prop rotations and divide up again.
|
|
|
pewe
|
| posted on 3/9/07 at 03:53 PM |
|
|
Doh! I'll try rolling it forwards tonight.
Thanks guys.
Cheers, Pewe
|
|
|
westf27
|
| posted on 3/9/07 at 04:00 PM |
|
|
Diffs r us
Pete,jack up and jam one wheel solid.Turn the propshaft and note the revolutions and part revolution to turn road wheel once.If the diff was out you
could count the crownwheel and pinion teeth.divide the crownwheel by the pinion and you get the ratio.Changed my 4.11 yesterday to a 3.54.Sometimes
the original tag may still be fitted to the diff nuts this used to state the ratio
|
|
|
02GF74
|
| posted on 3/9/07 at 04:07 PM |
|
|
quote:
Originally posted by westf27
Pete,jack up and jam one wheel solid.Turn the propshaft and note the revolutions and part revolution to turn road wheel once.
^^^^ wot he said but I think you need to divide final number by 2 to take into account the diff action. (think I'm right in this).
if you jact up one rear wheel on the gourng, there should be no need to wedge the opposite wheel if it is still on the ground.
|
|
|
