S/c Drops -Different Ratios, Different Noise?
#1
Posted 13 November 2019 - 10:00 PM
I have adjusted the ratio using different number of teeth on the primary and input.
Does the noise vary depending on the ratio / teeth on the gears does anyone know?
#2
Posted 13 November 2019 - 10:06 PM
The noise has more to do with the tooth profile and the fit between them. Mainly between the primary and idler.
the different ratios is more to do with adjusting your final drive ratio to suit the event.
#3
Posted 14 November 2019 - 06:21 AM
Would be interesting to know if 24 tooth 1:1 setup is quieter than a 23 tooth 1:1 setup.
#4
Posted 14 November 2019 - 08:00 AM
Misalignment between the Transfer Housing and Gearcase will also have an effect on how noisy they are.
All that I have closely looked at for this over the past couple of years have had misalignment, some worse than others.
#5
Posted 14 November 2019 - 09:03 AM
I think the non 1-1 ratios may compromise the mesh slightly to get the ratio change, your loosing a tooth on somthing but still keeping the same distance beween the shafts. Also youve not done anything like line boring the block have you? or changing the Block-Gearbox gasket type ( thickness)
#6
Posted 14 November 2019 - 12:02 PM
I fail to see the point of installing noisy SC transfer gears on road cars.
#7
Posted 14 November 2019 - 01:13 PM
I fail to see the point of installing noisy SC transfer gears on road cars.
i heard less power lost?? not sure about this...and SC, cus cool
#8
Posted 14 November 2019 - 02:56 PM
I fail to see the point of installing noisy SC transfer gears on road cars.
It's not a road car :)
#9
Posted 14 November 2019 - 03:27 PM
Assuming a race car straight cuts cut side thrust, and therefore give you out and out power with minimum "friction waste"... on a road car, pretty pointless, but does reduce side thrust wear if you shim them properly in the first place, but the cost of straight cuts usually outweighs that benefit.. helical gears generally "push" away" from each other causing "side" forces.... straight cuts "properly" shimmed stop that waste prob saving 2 /3 HP... which matters on a race car.. where cost is pretty much secondary / irrelevant to gaining a few tenths here and there
#10
Posted 14 November 2019 - 05:52 PM
but does reduce side thrust wear
Here's how I got around that
#11
Posted 15 November 2019 - 05:36 AM
Moke, never mind your exceptional engineering skills, all those parts are immaculately clean - I love it
Looks like someone did the screw driver trick on that gearbox/transfer case interface
#12
Posted 15 November 2019 - 08:31 AM
Nice! there was talk of minispares introducing a helical Timkin set of drops a while back, I gues it got shelfed, would go really well with their new helical gear kit though
#13
Posted 15 November 2019 - 11:36 AM
Assuming a race car straight cuts cut side thrust, and therefore give you out and out power with minimum "friction waste"... on a road car, pretty pointless, but does reduce side thrust wear if you shim them properly in the first place, but the cost of straight cuts usually outweighs that benefit.. helical gears generally "push" away" from each other causing "side" forces.... straight cuts "properly" shimmed stop that waste prob saving 2 /3 HP... which matters on a race car.. where cost is pretty much secondary / irrelevant to gaining a few tenths here and there
More like 0.2 hp
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