[Fot] bike engine oil for overdrive gearbox?

[Terry Stetler]

The OD shares it’s oil with the transmission.   I’d really worry about transmission life with engine oil as it’s lubricant.  Engine oil does not have the shear stability that gear oils do.
One of the worst features of the classic Mini is the fact that it shares it’s engine oil with the gearbox.

Terry Stetler

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From: Fot <fot-bounces at autox.team.net> on behalf of van.mulders.marcel--- via Fot <fot at autox.team.net>
Sent: Sunday, December 16, 2018 11:08:41 AM
To: fot
Subject: [Fot] bike engine oil for overdrive gearbox?

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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