[Fot] bike engine oil for overdrive gearbox?

Tue Dec 18 09:26:26 MST 2018

Thanks to all for the information. It seems very well possible to find a motorcycle oil for the TR overdrive (dog)box and get some advantage of modern synthetic engine oil, without the risk to ruin something. Besides, when something in a TR gearbox (with straight cut gears) goes wrong, mostly it is a needle bearing of the layshaft, or a consequence of that. The gears and the overdrive seem to be very strong. I think I will try the Amsoil 20W-50 V Twin or the Mobil 1 5W-50, both synthetic oils that probably have very good shear capacities. When I get some experience, good or bad, I will let it know in the fot forum. 
Marcel 

Van: "Duncan Charlton" <duncan.charlton54 at gmail.com> 
Aan: "fot" <fot at autox.team.net>, "van mulders marcel" <van.mulders.marcel at telenet.be> 
Verzonden: Maandag 17 december 2018 13:36:25 
Onderwerp: Re: [Fot] bike engine oil for overdrive gearbox? 

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, [ mailto:van.mulders.marcel at telenet.be | 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" < [ mailto:fot at autox.team.net | fot at autox.team.net ] > 
Aan: "fot" < [ mailto:fot at autox.team.net | 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. 

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On Sun, Dec 16, 2018 at 9:25 AM van.mulders.marcel--- via Fot < [ mailto:fot at autox.team.net | fot at autox.team.net ] > wrote: 

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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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