drop gears
Started by
neil_g
, Apr 07 2004 07:43 AM
14 replies to this topic
#1
Posted 07 April 2004 - 07:43 AM
right, now i know drop gears are a touch on the weak side if you try and put alot of torque through them.. but at miniworld last weekend there were quite a few engines running No2..
how come theyve got away with it? is it just the A series box and would they of upgraded/strengthened the box somehow?
Note: question is relating to gearboxes not No2 :tongue:
how come theyve got away with it? is it just the A series box and would they of upgraded/strengthened the box somehow?
Note: question is relating to gearboxes not No2 :tongue:
#2
Posted 07 April 2004 - 08:58 AM
not heard of weak drop gears before, its usually the diff that gives up first, thats why 4 pin diffs are so popular.
#3
Posted 07 April 2004 - 09:08 AM
Drop gears are not weak, read KC's comments in the mags.
Diffs and gearboxes are much weaker.
Siggy
Diffs and gearboxes are much weaker.
Siggy
#4
Posted 07 April 2004 - 09:19 AM
oh right.. i must of mis-read something :erm:
im sure there was something that wasnt great under higher torque, maybe it was the box?
im sure there was something that wasnt great under higher torque, maybe it was the box?
#5
Posted 07 April 2004 - 10:19 AM
Its the diff that will go first, drop gears are probly one of the strongest parts of the box
#6
Posted 07 April 2004 - 10:28 AM
*scratches head*
so what the hell am i talking about then??! lol
so what the hell am i talking about then??! lol
#7
Posted 07 April 2004 - 11:46 AM
I don't think that drop gears themselves are week, the main cause of failure is the bearings.
Early boxes and flywheel housings has much smaller bearings and it's these bearings that have a reputation for poor reliability.
Later engines used larger bearings which are much better. I've never had them fail and I've got 120 ft lb torque. I have blown the diff up though.
Wil
Early boxes and flywheel housings has much smaller bearings and it's these bearings that have a reputation for poor reliability.
Later engines used larger bearings which are much better. I've never had them fail and I've got 120 ft lb torque. I have blown the diff up though.
Wil
#8
Posted 07 April 2004 - 04:16 PM
are you back on the hills again this year will?
#9
Posted 08 April 2004 - 11:16 AM
Yep. Doing at least 10 events. Done Silverstone already
I'm off to york for Mini Vs Beetles on monday to bed my new tyres in and the Wiscomb park on the 24th for a start.
Wil
I'm off to york for Mini Vs Beetles on monday to bed my new tyres in and the Wiscomb park on the 24th for a start.
Wil
#10
Posted 08 April 2004 - 08:15 PM
probably see you at prescott if your there, i'll be with my mate, ian davies' mini,(silver with a black roof), he's trying for an entry on may 1/2nd
#11
Posted 08 April 2004 - 08:27 PM
You must be thinking of drop gears because people replace them first to S/C.
This isn't due to weakness, but because helical (standard) drop gears create a LOT of loss of power in the gearbox (the most significant loss is from there, a few percent I believe, up to 4-5).
This isn't due to weakness, but because helical (standard) drop gears create a LOT of loss of power in the gearbox (the most significant loss is from there, a few percent I believe, up to 4-5).
#12
Posted 09 April 2004 - 09:40 PM
This might sound liek a stupid question, but what are drop gears? Ive heard a few people talking about them.
Ive seen a couple of modified minis around here, and apparently they have them installed, I just cant figure out what they are/do. I heard them refered to as 'straight cut, drop gears' im assuming they are the same.
thanks alot,
pEaCe
Dom
Ive seen a couple of modified minis around here, and apparently they have them installed, I just cant figure out what they are/do. I heard them refered to as 'straight cut, drop gears' im assuming they are the same.
thanks alot,
pEaCe
Dom
#13
Posted 09 April 2004 - 10:12 PM
The drop gears or the transfer gears are the ones that drive the gearbox.
One on the end of the crank, the second is an idler gear and the other on the gearbox input shaft.
Standard gears have a helical tooth pattern.
Siggy
One on the end of the crank, the second is an idler gear and the other on the gearbox input shaft.
Standard gears have a helical tooth pattern.
Siggy
#14
Posted 16 April 2004 - 12:04 PM
The only Prescott I'm doing this year is September 25/26.
I know Ian, he beat me last year. I've been working hard over the winter to try and make sure it dosen't happen again.
Wil
I know Ian, he beat me last year. I've been working hard over the winter to try and make sure it dosen't happen again.
Wil
#15
Posted 16 April 2004 - 01:51 PM
he's been working hard as well!....good luck anyway!
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