Phranc
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 posted on 28/11/13 at 08:09 PM |
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Diffs
Hi New to this site. When doing a web search I thought I had found the solution to my problem but having registered I can't find the info I
registered for :-(
I am rebuilding a Trike I have had for a couple of years. I was told it had a Ford Sierra sapphire diff and axle (rear)
I would like a higher cruising speed. I have gone down the route of increasing road wheel diameter, twice, with little improvement.
The diff has these numbers/idents stamped on it.
Ford oval plate
10-1-83
838840275BE
Could anyone please identify this diff for me please?
Does anyone know if I could give her longer legs.
Cheers Frank
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jacko
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| posted on 28/11/13 at 08:26 PM |
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http://www.locostbuilders.co.uk/forum/9/viewthread.php?tid=85080
Have a look here
And welcome to the forum
Jacko
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mcerd1
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| posted on 28/11/13 at 08:28 PM |
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has it got a little metal tag on the back ? that's where the code is written
otherwise you'll need to count the number of turns on the input for one turn of the outputs
(or open up the back - its often stamped/written on the ring gear)
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Phranc
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 posted on 28/11/13 at 09:11 PM |
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Diffs
Thanks Jacko That was the link I was looking for when I registered
And also to mcerd1 I am taking the diff to be blasted tomorrow so hopefully I may find the rest of the idents
Cheers Frank
these were dam fine quick answers
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blakep82
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| posted on 28/11/13 at 09:14 PM |
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i'm sure my atlas diff has 3.44 written (in white paint, by hand) on the crownwheel? got no reason to believe it wasn't done at the
factory too. have you taken the cover off to look? might be worth a shot?
________________________
IVA manual link http://www.businesslink.gov.uk/bdotg/action/detail?type=RESOURCES&itemId=1081997083
don't write OT on a new thread title, you're creating the topic, everything you write is very much ON topic!
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Boltsy
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| posted on 28/11/13 at 09:35 PM |
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Try here....
http://www.super7thheaven.co.uk/Sierra_Rear_Differential
Limitation starts where the visions end - Jimmy Johnson
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NOTE:This user is registered as a LocostBuilders trader and may offer commercial services to other users
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snapper
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| posted on 29/11/13 at 06:00 AM |
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If you blast the diff casing the little tin tag held on by top left diff cover bolt will disappear
Then you will have to take the diff cover off and read crown wheel
What bike engine do you run?
Most need 3.38 to get top speed some get 110 with 3.62 others need the 3.14
The 3.62 is common the others rare and will cost £250
I eat to survive
I drink to forget
I breath to pi55 my ex wife off (and now my ex partner)
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Phranc
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| posted on 29/11/13 at 08:41 AM |
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Diffs
Thanks for that info Snapper.
If there was a little tin tag on the back plate it is long gone.
The bike is a Yamaha XVS 1100 Dragstar with a few minor engine tweaks.
On its original Trike wheels I did get 95 indicated on the sat nav in Germany but she was near the rev limiter.
Actually I didn't consider that too bad since the quoted top speed for the bike is 110 and at the time she was almost double the weight of the
basic bike. I've had one short run on the 17" wheels I am now fitting and it doesn't seem to have affected the acceleration at all
but because I had not calibrated the "Speed Healer" or had the sat nav on I don't know if the top end has been affected.
She will hopefully have lost considerable amount of weight over this winter.
Thanks again
Frank
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hkp57
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| posted on 29/11/13 at 08:59 AM |
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As previously noted in the thread and as you have the diff out, turn the input shaft and count how many turns it takes to turn the output shaft
once.
Whats the rev limiter on this engine, I don't think its a screamer so 95 would be about right with a 3.62 diff. Its a fairly torquey engine so
should pull a 3.38 without an issue.
Here is a link to a calculator you can use.
Linky
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Not Anumber
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| posted on 29/11/13 at 12:17 PM |
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why 17" inch wheels ? Are large diameter wheels more popular for trikes than locosts where even 15" wheels are considered big ?
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Phranc
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| posted on 4/12/13 at 09:04 PM |
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Diffs
Thanks Guys Great info.
Diff cleaned up well and the little tin tag was! there after all tells me it is a 3:14.
Its all glossed up black now and looks great.
It has to be mounted upside down in the frame and actually looks better for it.
my only problem now is that I don't know how much oil and what grade I should use.
If anyone has the info I would be very grateful
Cheers
Frank
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