[Fot] bike engine oil for overdrive gearbox?

[Duncan Charlton]

Does the wet clutch material in a motorcycle resemble the wet clutch material in the overdrive unit?

Duncan

> On Dec 17, 2018, at 2:07 AM, van.mulders.marcel at telenet.be wrote:
> 
> Duncan, the gearbox in my racecar (TR4A) is a dogbox, so without synchromesh rings,  and I suppose you can compare it to a bike gearbox when considering what oil can be used.
> Marcel
> 
> Van: "fot" <fot at autox.team.net>
> Aan: "fot" <fot at autox.team.net>
> Verzonden: Zondag 16 december 2018 23:05:36
> Onderwerp: Re: [Fot] bike engine oil for overdrive gearbox?
> 
> Don’t most motorcycles that share oil between the engine and gearbox use dog gear engagement?  The label on the Honda synthetic motorcycle oil I have been using in my NSU 1200 engine (practically a motorcycle engine anyhow) touts its favorable effect on dog gears.  Of course, that left me wondering what its effect on synchromesh would be, so I wondered whether it would be appropriate for my Mini Cooper S race engine/gearbox combo.
> 
> I have have heard good things about Redline Shock Proof Gear Oil’s ability to keep gearbox temperatures down: https://www.redlineoil.com/shockproof-gear-oils <https://www.redlineoil.com/shockproof-gear-oils> .  The literature suggests that it creates less drag compared to other oils of the same viscosity rating.  I use it in the gearbox of the NSU racer but have made no attempt to measure how hot it gets with any type of oil.
> 
> Duncan
> Ps: I’ve been using 30 weight non-detergent oil in the Moss gearbox in my Morgan but that’s an unusual gearbox with rather balky steel synchro materials.  The redline product I tried gave about the same shift feel but the synchromesh oil (AC Delco 10-4014) gave a slight improvement in feel and synchro action.  
> 
> 
> On Sun, Dec 16, 2018 at 9:25 AM van.mulders.marcel--- via Fot <fot at autox.team.net <mailto:fot at autox.team.net>> wrote:
> Like most TR racers I believe that an overdrive gearbox is worth some laptime on most racetracks. But there are some drawbacks :9.5kgs weight penalty and the gap between 4th gear and 4th overdrive gear is too big. There is also a considerable amount of power loss when the overdrive is engaged because of the friction in the overdrive gears : but I think that in general modern engine oil can reduce the friction in the overdrive, compared to GL-4 gear oil, because it has much better friction modifiers. But are these friction modifiers compatible with the clutch in the overdrive?? Classic Mini's and most bikes have 1 oil pan for both engine and gearbox : what about using a modern bike oil or a modern (synthetic) classic mini oil in an overdrive gearbox to reduce the friction in the overdrive and gain some acceleration when 4th overdrive gear is engaged?
> Marcel
> _______________________________________________
> fot at autox.team.net <mailto:fot at autox.team.net>
> 
> http://www.fot-racing.com <http://www.fot-racing.com/>
> 
> Donate: http://www.team.net/donate.html <http://www.team.net/donate.html>
> Archive: http://www.team.net/pipermail/fot <http://www.team.net/pipermail/fot>
> Unsubscribe/Manage: http://autox.team.net/mailman/options/fot/kaskastner@gmail.com <http://autox.team.net/mailman/options/fot/kaskastner@gmail.com>
> 
> 
> 
> _______________________________________________
> fot at autox.team.net <mailto:fot at autox.team.net>
> 
> http://www.fot-racing.com
> 
> Donate: http://www.team.net/donate.html
> Archive: http://www.team.net/pipermail/fot
> Unsubscribe/Manage: http://autox.team.net/mailman/options/fot/duncan.charlton54@gmail.com
> 
> 
> 
> 
> _______________________________________________
> fot at autox.team.net
> 
> http://www.fot-racing.com
> 
> Donate: http://www.team.net/donate.html
> Archive: http://www.team.net/pipermail/fot
> Unsubscribe/Manage: http://autox.team.net/mailman/options/fot/van.mulders.marcel@telenet.be

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://autox.team.net/pipermail/fot/attachments/20181217/821a643e/attachment-0001.htm>