[Fot] bike engine oil for overdrive gearbox?

[ralph hansen]

 I have a dog box in my RX7 - use Redline Shockproof Gera Oil - comes in 3 different weights - works well at reducing wear on those parts that get heavy wear - its formulated to stay attached to the bits so engagements have additional cushioning - reduced wear by a noticeable amount in my car
Ralph
    On ‎Monday‎, ‎December‎ ‎17‎, ‎2018‎ ‎02‎:‎37‎:‎57‎ ‎AM‎ ‎CST, van.mulders.marcel--- via Fot <fot at autox.team.net> 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 .  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.
DuncanPs: 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> 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_______________________________________________
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