Dana 60 or 9" (Jake)

[squirrel]

Hubers did some testing on a 9" versus a beefed up 8.8, the 9" sucked 60whp more than the 8.8. Just a point of reference.

at what power level? the loss should be a percentage...

[BBR]

at what power level? the loss should be a percentage...

I was thinking about this very thing in regards to transmissions the other day, but could not wrap my brain around just exactly why it should be expressed as a percentage. 15% in a 200hp car is 30 hp and 15% in a 600hp car is 90. All other things being equal, why would require more power to operate behind a more powerful engine? Why would the hp loss not be a constant?

[Orange65]

Gear trains are rated by efficiencies- probably because the higher the torque transmitted, the higher the friction between the gears and the greater the losses. Here is a page I found on gear efficiencies:

http://www.meadinfo.org/2008/11/gear-efficiency-spur-helical-bevel-worm.html

Just a fact of life...

[lun40119]

I have had two issues with mine. It is a Strange Engineering S-60. Not pleased at all with it.

First issue was it spun a bearing race on the drivers side carrier bearing.....made a mess. This happened during Drag Week 11.





Second issue is it cracked the welds for the tubes where they went into the houseing. I run a radial, and once and a while they will chatter.......I am guessing this had something to do with it.








Rewelded and had a brace built for it.....





This is with 750ish HP 3600lbs, 1.32-1.33 60fts....

Sorry it took me so long to reply.......haven't been online much.

[BBR]

<< can't believe I'm saying this lol >>

Nice rear end, Jake.

[lun40119]

That piece of shit breaks again it is going down the road. If I could do it again.......Fab 9" Fo shizzle.

Since the repairs it has been flawless.......fingers crossed, knock on wood.

[ksj2]

I have had two issues with mine. It is a Strange Engineering S-60. Not pleased at all with it.

First issue was it spun a bearing race on the drivers side carrier bearing.....made a mess. This happened during Drag Week 11.





Second issue is it cracked the welds for the tubes where they went into the houseing. I run a radial, and once and a while they will chatter.......I am guessing this had something to do with it.








Rewelded and had a brace built for it.....





This is with 750ish HP 3600lbs, 1.32-1.33 60fts....

Sorry it took me so long to reply.......haven't been online much.

Noticed tehe Dodge Dart in the background.Your new ride?

[squirrel]

I was thinking about this very thing in regards to transmissions the other day, but could not wrap my brain around just exactly why it should be expressed as a percentage. 15% in a 200hp car is 30 hp and 15% in a 600hp car is 90. All other things being equal, why would require more power to operate behind a more powerful engine? Why would the hp loss not be a constant?

Friction force is mu times normal force. I don't know why it is, but it is.

If the 9" rear in my car required 90 hp to turn all the time, I'd get much worse mileage than I do. Same with the TH400. I know they're not the most efficient drivetrain components around, but the car will move when idling in gear

[Beagle]

blown bbc is making how many hp at idle?

[lun40119]

Noticed tehe Dodge Dart in the background.Your new ride?

Um...................NO!!!

[squirrel]

blown bbc is making how many hp at idle?

Not many. Like any other engine, it's making enough power to overcome it's internal friction, that's it.