Author Topic: Rear axle parasitic loss  (Read 11602 times)

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Offline BobDcuda

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Re: Rear axle parasitic loss
« Reply #15 on: December 19, 2014, 12:59:52 AM »
 :?   :-):-D :-D

Offline Jack Gifford

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Re: Rear axle parasitic loss
« Reply #16 on: December 19, 2014, 03:16:55 AM »
... Unfortunately the spiral bevel gear can not replace a hypoid gear in an automotive drive axle because it can not transmit as much of torque as a hypoid gear...
Only somewhat true. A bevel gear set would need to be slightly more robust for the same torque capacity as a hypoid set. The hypoid rear axles came into popular vehicle use when lower floorpans were desired (pinion shaft offset below axle centers).

Regarding the efficiency- note that straight-cut bevel gears are even more efficient than spiral bevel. Do any GC centers use straight-cut bevel ring & pinions?
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Offline SPARKY

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Re: Rear axle parasitic loss
« Reply #17 on: December 19, 2014, 08:56:58 AM »
the QC based on early ford's banjo  have bevel gears
Miss LIBERTY,  changing T.K.I.  to noise, dust, rust, BLUE HATS & hopefully not scrap!!

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Offline Richard 2

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Re: Rear axle parasitic loss
« Reply #18 on: December 19, 2014, 09:25:59 AM »
Unless you are running over 1100 Hp I would not even think about an Over Drive. (SoHK's)
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Offline jdincau

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Re: Rear axle parasitic loss
« Reply #19 on: December 19, 2014, 10:08:35 AM »
the QC based on early ford's banjo  have bevel gears
The V-8 quick change has spiral bevel gears, I don't know about the model A type.
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Offline Stan Back

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Re: Rear axle parasitic loss
« Reply #20 on: December 19, 2014, 12:12:47 PM »
. . . and then there's lubrication choices, too.
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Offline V4F STR 60

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Re: Rear axle parasitic loss
« Reply #21 on: December 19, 2014, 12:17:48 PM »
. . . and then there's lubrication choices, too.

We've had good luck with the very light viscosity drag race axle and tranny lubes.
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Offline SPARKY

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Re: Rear axle parasitic loss
« Reply #22 on: December 19, 2014, 07:00:56 PM »
0-20 synthetic eng oil in my rears
Miss LIBERTY,  changing T.K.I.  to noise, dust, rust, BLUE HATS & hopefully not scrap!!

"Security is mostly a superstition. It does not exist in nature, nor do the children of men as a whole experience it. Avoiding danger is no safer in the long run than outright exposure. Life is either a daring adventure or nothing."   Helen Keller

We are going to explore the racing N words NITROUS & NITRO!

Offline wheelrdealer

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Re: Rear axle parasitic loss
« Reply #23 on: December 19, 2014, 10:16:46 PM »
0-20 synthetic eng oil in my rears

Sparky, you running polished gear set or not?

I have heard ... you know those people who say such things, to run the light oils you need a polished gear set.

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Offline SPARKY

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Re: Rear axle parasitic loss
« Reply #24 on: December 19, 2014, 10:47:20 PM »
polished by miles and miles on American hwys.---I have never run anything but used gear sets
Miss LIBERTY,  changing T.K.I.  to noise, dust, rust, BLUE HATS & hopefully not scrap!!

"Security is mostly a superstition. It does not exist in nature, nor do the children of men as a whole experience it. Avoiding danger is no safer in the long run than outright exposure. Life is either a daring adventure or nothing."   Helen Keller

We are going to explore the racing N words NITROUS & NITRO!

Offline John Burk

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Re: Rear axle parasitic loss
« Reply #25 on: December 20, 2014, 12:49:11 AM »
Has anybody had bad experience from going out and running hard on new gears ? Are licensing runs enough to brake gears in ?
« Last Edit: December 20, 2014, 12:51:45 AM by John Burk »

Offline Sumner

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Re: Rear axle parasitic loss
« Reply #26 on: December 20, 2014, 01:09:43 AM »
Has anybody had bad experience from going out and running hard on new gears ? Are licensing runs enough to brake gears in ?

John this doesn't apply to you since you have no 'rear axle gears'  :evil: :evil:.  Sorry, couldn't resist.

Sparky was it you that said the guy who has set up your gears, sets the ring/pinion up a little looser than say he would for a street driven car that was going to go tens of thousands of mile on a new gear set?  Maybe someone else told me or I'm tired and just imagined it or he said just the opposite  :cry: :cry:,

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Offline panic

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Re: Rear axle parasitic loss
« Reply #27 on: December 20, 2014, 11:13:01 AM »
Ranked by parasitic loss (lowest first):
Dana 60
Chrysler 8-3/4" (there are 3 pinion types)
Ford 9"

Offline SPARKY

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Re: Rear axle parasitic loss
« Reply #28 on: December 20, 2014, 12:40:53 PM »
Summ  that was what I understood.
Miss LIBERTY,  changing T.K.I.  to noise, dust, rust, BLUE HATS & hopefully not scrap!!

"Security is mostly a superstition. It does not exist in nature, nor do the children of men as a whole experience it. Avoiding danger is no safer in the long run than outright exposure. Life is either a daring adventure or nothing."   Helen Keller

We are going to explore the racing N words NITROUS & NITRO!

Offline 64avanti

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Re: Rear axle parasitic loss
« Reply #29 on: December 20, 2014, 10:52:16 PM »
Spur gears in a transmission have about 1% loss per mesh.  The transmission has more losses than that due to oil churning some bearing losses etc.   A straight bevel gear has about 1.5% loss.  Hypoid and spiral bevel gears have much higher losses due to the fact that there is more sliding motion involved in the gear contact than you would with a straight bevel gear.