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Straight Cut Noise

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#1 Jon937

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Posted 10 March 2016 - 08:14 PM

Has anyone found a way to reduce the noise from straight cut gears?

Both in the differential and transfer gears as these mesh while not totally submersed in oil.

 

I had thought about intentionally overfilling the gearbox with oil and installing a breather in the top of the diff cover and transfer gear housing, while using an adjustable oil pressure valve to ensure the oil pressure does not get too high.

 

My worry would be the crank webs would need to run in more oil and increase drag on the crankshaft, as well as smearing the black silicone on the gaskets to ensure the gaskets can handle the added pressure.

 

 

 

Another idea I had was running a small fluid pump with an additional oil pick up, to spray a constant oil supply onto the gears while the engine is running.

 

 

http://calverst.com/...s and noise.htm

 

 

Any thoughts, ideas good or bad greatly appreciated please



#2 kezzkitkat

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Posted 10 March 2016 - 08:20 PM

bad idea adding more oil 

most are going to say either put up with it  or get rid 

ive know people make the tolerance smaller on the transfer gears reducing the noise slightly 

also even changing them to another brand 



#3 Jon937

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Posted 10 March 2016 - 08:23 PM

Thank you kezzkitkat

 

What is your thoughts about adding an additional oil pump to spray the gears?



#4 Midas Mk1

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Posted 10 March 2016 - 08:24 PM

Just change to helical..


Edited by Midas Mk1, 10 March 2016 - 08:25 PM.


#5 Spider

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Posted 10 March 2016 - 08:28 PM

Lubrication is not the reason for the noise.

 

http://www.theminifo...ears-beginners/

 

Overfilling or over lubrication will only result in burnt out bearings and poor oil life. The Synchromesh will also have a hard time of it too.


Edited by Moke Spider, 10 March 2016 - 08:32 PM.


#6 kezzkitkat

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Posted 10 March 2016 - 08:35 PM

Thank you kezzkitkat

 

What is your thoughts about adding an additional oil pump to spray the gears?

waste of time rarther spend the money on a decent radio instead 

as above moke spider has linked have a read 

also the normal or high flow one is more than efficient i think the swiftune one is the one to have at the moment 



#7 Jon937

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Posted 10 March 2016 - 08:35 PM

As Keith Calver has published on his site and in mini magazines is that the FD and transfer gears are not submersed in oil to dampen out the noise.

 

http://calverst.com/articlefm.htm



#8 Jon937

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Posted 10 March 2016 - 08:37 PM

im looking at using dog gears so there is no syncro to worry about



#9 kezzkitkat

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Posted 10 March 2016 - 08:44 PM

the sc fd are very noise indeed there is no solution to quite them down 

the only way would be to consider using a semi fd much quieter  running and just as strong

i assume your going down the lsd route ?



#10 Jon937

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Posted 10 March 2016 - 08:48 PM

quaife lsd

 

do you know if anywhere does semi helical transfer gears?



#11 sledgehammer

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Posted 10 March 2016 - 08:55 PM

all I can suggest is thick carpet / sound deadening

 

& ear plugs

 

loud exhaust anyone ? 

 

the noise is from the way the gears mesh together



#12 Ivor Badger

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Posted 10 March 2016 - 08:59 PM

im looking at using dog gears so there is no syncro to worry about


So why are you bothered about the noise?

#13 Spider

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Posted 10 March 2016 - 09:00 PM

As Keith Calver has published on his site and in mini magazines is that the FD and transfer gears are not submersed in oil to dampen out the noise.

 

http://calverst.com/articlefm.htm

 

Hmmmm,,,, maybe Mr. Calver should have another look.

 

The Main Gear Set and the FD are ~1/2 submersed in oil.


Edited by Moke Spider, 10 March 2016 - 09:01 PM.


#14 nicklouse

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Posted 10 March 2016 - 09:14 PM

im looking at using dog gears so there is no syncro to worry about


Not driving in traffic much then?

#15 Dusky

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Posted 10 March 2016 - 09:38 PM

Do us all a favour and produce some herringbone gears. ;)
Or just ditch them if its a road going car, wear earplugs under your crash helmet if not.





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