#1
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diff ratio's
sorry about this guys/girls, i know you have covered this many times before but i just cant seem to work it out
i have a fireblade 919 indy and need to know what diff is in it the codes on the diff are as follows 838g-4030-6a) or sumit like, as few digits are hard to read. another code on there was (004ba) the car has a reg mark aswell and old log book to a 1990 g reg sierra saphire lx 1998cc if this helps. any help would be great |
#2
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TT is the best one to ask, if not take the back case off and divide the number teeth on the pinion by the number of teeth on the crown wheel and that gives you the ratio to :1.
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#3
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Quote:
cheers jim Last edited by layotn20 : 6th August 2010 at 10:03 PM. |
#4
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The diff is more likely to be a 3.6 or perhaps a 3.9
The higher the number the lower the diff ratio. 3.6 will be faster accelerating than a 3.3 Top speed will be about 110 in 5th 4 to 1 diff = 4 prop rotations to 1 wheel rotation 3 to 1 diff = 3 prop rotations to 1 wheel rotation Last edited by snapper : 7th August 2010 at 03:36 PM. Reason: More info |
#5
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just took the back casing off the diff and on the crown wheel is stamped from ford( 83bg-4210-sd) also it does have 3.62 stamped on it. so i take it, its a 3.62? if so what shud this top out mph. and it seems very clonky going into gears is this with all kit cars or do you reckon the diff could do with a refurb
cheers jim |
#6
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Top speed will be about 110 but you will get ther quickly.
Clonky gear change is a bike engine/ box standard as the dogs engage, bike boxes can go up the box without dipping the clutch |
#7
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Why take of the back cover?
Lock one output. Put a pointer on the input. Turn the output 1 revolution and count the turns + degrees on the input. By My Calcs. 3.33 = 3 rotations + 118d 3.62 = 3 rotations + 223d 3.92 = 3 rotations + 331d So it should be fairly obvious at ~106d seperations. TT
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You only get a woosh with a dump valve Build Thread Man Cave Mantiques Cecil Street Auto Repairs Garage Carlisle Build Cost £4181.65 - Last - Wheel Cylinders |
#8
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Wouldn't it be half of that due to the differential? In my understanding you either have to rotate both outputs 1 rev each, or lock one output and rotate the other one two times.
(Oh, by the way, here is a classic film about the pripciple of a differential, great if you need to explain it to somebody: http://www.youtube.com/watch?v=K4JhruinbWc . Skip to 2:00 if in a hurry)
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Albert Haynes Roadster FAQ | Haynes Builder Locations Gallery, build thread in Lithuanian / via Google Translate. |
#9
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I understand what you mean, you can leave one wheel on the ground or lightly apply the handbrake to prevent rotation of the free wheel.
This is not a problem with an LSD but can be an issue with the Quaife ATB |
#10
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Sierra Diff
Hi,
A friendly man at the local ford dealer let me use his microfiche machine and I've managed to get all the part numbers, FINIS numbers, exploded diagrams etc for Sierra, Granada and Scorpios. I'm putting together everything I've found at www.super7thheaven.co.uk Hope that helps - It's a work in progress |
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