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Pantera2075
On the Road
Joined: Fri Oct 12, 2007 9:38 am
Posts: 740
Location: Stoke
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 Gearbox whine Do straight cut drop gears produce a noticable whine on over-run? I noticed mine was very pronouced at the weekend. It's obviously a helical box, but was a lot louder than what I was used to.
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GTM Libra, GTM Coupe, Siva Moonbug, GMC Safari And DeTomaso Pantera.
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| Tue Jul 15, 2008 3:03 pm |
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Tim Rowe (1130)
The Terrible Tims
Joined: Fri Sep 28, 2007 7:56 pm
Posts: 747
Location: In the garage,Sileby, LEICS
GTM: Cox/Coupe
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Re: Gearbox whine Straight cut drops are definitely where the noise is coming from. It is supposed to be louder than a straight cut box, but I can't confirm this.
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Tim Rowe
"Is est totus perfectus per fumi quod speculum"
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| Tue Jul 15, 2008 3:37 pm |
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gtmdriver
On the Road
Joined: Tue Oct 30, 2007 8:44 am
Posts: 632
Location: Chester le Street
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Re: Gearbox whine Straight cut drop gears are very loud and whine on overun and drive.
When I used to drive my racer to and from the circuits I used to carry chewable asprin to deal with the eventual headaches caused by the racket.
I have an amatuer video of my car on track and you can hear it coming a mile off.
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GRP rules!
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| Tue Jul 15, 2008 5:46 pm |
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Pantera2075
On the Road
Joined: Fri Oct 12, 2007 9:38 am
Posts: 740
Location: Stoke
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Re: Gearbox whine No, this was definitely just on overrun - maybe it's it's the usual noise accompanied by where the gearbox is that makes it loud?
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GTM Libra, GTM Coupe, Siva Moonbug, GMC Safari And DeTomaso Pantera.
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| Tue Jul 15, 2008 5:56 pm |
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Dino
Ready for SVA
Joined: Wed Oct 03, 2007 8:54 pm
Posts: 375
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Re: Gearbox whine Straight cut drops often sound different on the overrun, also A and A+ are supposed to sound different, but then I suspect all the manufacturers gears sound different from each other.
Vizard gave info on how to make them quieter, it's related to how deep the teeth are cut amongst other things.
I guess it's possible that they've worn in on the drive side, or that a loose idler bearing is allowing a degree of 'floppyness' and the unworn part is now running against a worn part on the other gear.
Does it rattle at tickover? This is usually a good indicator of loose thrust bearings.
Has it got worse, or did it always sound like that?
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| Tue Jul 15, 2008 7:14 pm |
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Pantera2075
On the Road
Joined: Fri Oct 12, 2007 9:38 am
Posts: 740
Location: Stoke
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Re: Gearbox whine Dunno if it's any worse - it was the first time I drove it.
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GTM Libra, GTM Coupe, Siva Moonbug, GMC Safari And DeTomaso Pantera.
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| Tue Jul 15, 2008 7:29 pm |
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West
Admin, and Coupe Nutter
Joined: Fri Sep 14, 2007 10:34 pm
Posts: 1769
Location: In the workshop
GTM: Cox/Coupe
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Re: Gearbox whine They wernt noisy enough to be straight cut from memory to be honest, listen to stuarts car next time that straight cut, you will know about them. the non a plus ones do seem noiser, as my bros mini was louder than mine on the drops
WEST
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| Tue Jul 15, 2008 9:00 pm |
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Andy
Ready for SVA
Joined: Thu Nov 15, 2007 10:22 pm
Posts: 363
Location: Ireland
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Re: Gearbox whine I,m running a set of SC drop gears in mine as well as SCCR box A+, there is definitley the typical whine whilst moving but no noise once stationary. I would say maybe something is worn/wearing and maybe rubbing, thrust washers could be a good start point.
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| Wed Jul 16, 2008 9:50 am |
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nigelsgtm
GTM delivered
Joined: Wed Oct 31, 2007 8:32 pm
Posts: 19
Location: brownhills walsall
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Re: Gearbox whine my car has sc drops and gearbox ,its not to noisy just nice  , have you got sc drops in the car or helical ones if they are helical then you may have a problem if they are sc then sit back boot it and enjoy 
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keep it real keep it "A"
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| Fri Jul 18, 2008 3:14 pm |
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