Mercedes Sprinter rear axle ratios - Page 2 - Motorhome Forums, Motorhome Discussion, Motorhome Chat

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post #11 of 35 (permalink) Old 29-03-2015, 11:40
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Quote:
Originally Posted by 747 View Post
Ah I see, now we are talking about gearboxes instead of the diffs the OP asked about.


Anyway, I will drop out of the thread. I thought my experience of working for Eaton Axles (manufacturer of Diffs and special purpose axles) might have been useful.
Me too, odd how some threads get buggered about.
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post #12 of 35 (permalink) Old 29-03-2015, 11:44
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Originally Posted by mgdavid View Post
A gear is a gear, ratio is ratio, and number is number. Same applies to 'box and diff, as I'm sure you are well aware.
Sorry David, you dost talk in riddles!
Whether talking about gear box or back end then -

Higher ratio eg, 10 to 1 = greater grunt, lower top speed.
Lower ratio eg, 1 to 1 = less grunt, more speed.

Just because the great unwashed talk about " top gear" being the highest gear does not mean it has the highest ratio - it is just the biggest number on the knob. ( take from that what you will )
The OP asked about diff ratio ( which could be specified ) not gear box ratio ( which cannot be specified!)

Since this bit of doggerel has used my last post I won't be able to educate you further. Enjoy.
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post #13 of 35 (permalink) Old 29-03-2015, 11:51
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Quote:
Originally Posted by beardy View Post
Sorry David, you dost talk in riddles!
Whether talking about gear box or back end then -

Higher ratio eg, 10 to 1 = greater grunt, lower top speed.
Lower ratio eg, 1 to 1 = less grunt, more speed.

Just because the great unwashed talk about " top gear" being the highest gear does not mean it has the highest ratio - it is just the biggest number on the knob. ( take from that what you will )
The OP asked about diff ratio ( which could be specified ) not gear box ratio ( which cannot be specified!)

Since this bit of doggerel has used my last post I won't be able to educate you further. Enjoy.
I take no pleasure from calling out another who has no mathematical background and refuses to learn; 10 to 1 is NOT a 'higher' ratio than 1 to 1.
It is a numerically larger number, but is a lower ratio.

I travel not to go anywhere, but to go. I travel for travel's sake. The great affair is to move. (Robert Louis Stevenson)
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post #14 of 35 (permalink) Old 29-03-2015, 11:51
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Quote:
Originally Posted by beardy View Post
Sorry David, you dost talk in riddles!
Whether talking about gear box or back end then -

Higher ratio eg, 10 to 1 = greater grunt, lower top speed.
Lower ratio eg, 1 to 1 = less grunt, more speed.

Just because the great unwashed talk about " top gear" being the highest gear does not mean it has the highest ratio - it is just the biggest number on the knob. ( take from that what you will )
The OP asked about diff ratio ( which could be specified ) not gear box ratio ( which cannot be specified!)

Since this bit of doggerel has used my last post I won't be able to educate you further. Enjoy.

Oh, please subscribe, we need your sort on here, nearly spilt tea all over me keyboard, I'd almost cough up the dosh myself
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post #15 of 35 (permalink) Old 29-03-2015, 12:29
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Originally Posted by mgdavid View Post
I take no pleasure from calling out another who has no mathematical background and refuses to learn; 10 to 1 is NOT a 'higher' ratio than 1 to 1.
It is a numerically larger number, but is a lower ratio.
Realy sorry to rain on your parade David but my training as a gearbox design engineer does not allow me to agree with you.
You talk shite!
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post #16 of 35 (permalink) Old 29-03-2015, 12:36
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mgdavid, why not just google it? Beardy and 747 are correct, Alan.
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post #17 of 35 (permalink) Old 29-03-2015, 13:43
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Happy to take advice, so I googled 'higher and lower gear ratios', here are the first 5 results.
http://www.mossmotoring.com/the-high...l-gear-ratios/
and
http://www.ehow.com/facts_7568829_di...ear-ratio.html
and
http://www.answers.com/Q/What_is_bet...low_gear_ratio
and
http://www.forconstructionpros.com/a...ve-performance
and
http://www.differentials.com/technical-help/faqs

All explain that the higher the number the lower the ratio.
As I already explained, it is vital to distinguish between a numerically high number and a high ratio, which are opposites. If one doesn't use the terminology correctly it will be all too easy to order the wrong axle ratio for the intended use.

I travel not to go anywhere, but to go. I travel for travel's sake. The great affair is to move. (Robert Louis Stevenson)
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post #18 of 35 (permalink) Old 29-03-2015, 13:56
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Quote:
Originally Posted by mgdavid View Post
.................
Higher ratios give greater cruise and top speeds but slower acceleration times, and inferior hillclimbing capability.

All your links say the opposite of the above.
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post #19 of 35 (permalink) Old 29-03-2015, 14:16
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post #20 of 35 (permalink) Old 29-03-2015, 14:30
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Quote:
Originally Posted by erneboy View Post
All your links say the opposite of the above.
No they don't; I quote:

#1 ) Low gears give fast acceleration, high gears give better cruising.

#2 ) Low ratio gears ........good for torque but not speed.
High ratio gears are the opposite...... good for speed, but not power.

#3 ) if you want lots of speed no power on the bottom end you go with the high ratio - if you want lots of torque on take off and lots of pulling power you take the low gear ratio.

#4 ) The numerically higher gear ratio (in this case, 4.30) increases wheel torque and improves acceleration from low speeds.

#5 ) The higher the number, the lower the ratio.

I travel not to go anywhere, but to go. I travel for travel's sake. The great affair is to move. (Robert Louis Stevenson)
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