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 Post subject: Re: SCCR noise
PostPosted: Wed Oct 11, 2017 9:40 pm 
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Joined: Thu Jun 24, 2010 11:26 pm
Posts: 668
Location: East Cumbria
Peter Laidler wrote:
Come on Richspec...... you could see that it was written with my tongue firmly planted in my cheek for heavens sake! Banbury is only about 8 miles from Oxford!!



:lol: :lol: In my defence i was in a rush to get down to the hotel restaurant for my meal and never bothered to look to see how far apart they were :roll: Geography of that there down south isnt my forte!


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 Post subject: Re: SCCR noise
PostPosted: Wed Oct 18, 2017 2:26 am 
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Joined: Mon May 07, 2012 6:10 am
Posts: 2403
Location: Big Red, Australia
The noise of SC Gears comes largely from the tooth contact ratio and with straight cut gears, being what they are, there's little that can be done to increase this ratio. Typically Straight Cuts are 1:1, but with some detailed work, can get up to 1.1:1. As far as I know, that's the limit with them, Automotive or otherwise.

Helicals by comparison run a contact ratio of usually between 1.8:1 up to about 3:1.

These figures are nothing to do with the actual gear ratios.

The other point with our gears that has a hand on the volume control is the machining quality of the cases and how well aligned the shafts are as well as the depth of tooth contact. Changing the depth here has HUGE effects on the pressure angle of the tooth and the noise they make.


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 Post subject: Re: SCCR noise
PostPosted: Wed Oct 18, 2017 4:34 pm 
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Joined: Fri Jan 15, 2016 1:22 pm
Posts: 135
Peter , clearly Oxford is expanding as fast as Banbury given its only 8 miles between the two places now on your map?


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 Post subject: Re: SCCR noise
PostPosted: Wed Oct 18, 2017 4:41 pm 
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Joined: Thu Jun 24, 2010 11:30 am
Posts: 9610
Location: Oop North where it's dark & cold nearly all the time.
If I was doing this build, I'd use a close ratio helical kit. Would never consider S/C gears for a road car.

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(I am Sir Basil, King of the herbs)


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