<html><body><div style="font-family: Verdana, Arial, Helvetica, sans-serif; font-size: 10pt; color: #000000"><div>Hallo Kas,</div><div>I would try a bike oil, because these oil ought to be be suitable for a gearbox, because, in a bike, engine and gearbox have a common oilcirculation, so there should be no worries about the gears in the gearbox and overdrive. Less friction would mean cooler oil as a result, but maybe todays friction modifiers are more effective?</div><div>Marcel</div><div><br></div><hr id="zwchr" data-marker="__DIVIDER__"><div data-marker="__HEADERS__"><b>Van: </b>"Kas Kastner" <kaskastner@gmail.com><br><b>Aan: </b>"van mulders marcel" <van.mulders.marcel@telenet.be><br><b>Verzonden: </b>Zondag 16 december 2018 18:37:30<br><b>Onderwerp: </b>Re: [Fot] bike engine oil for overdrive gearbox?<br></div><br><div data-marker="__QUOTED_TEXT__"><div dir="ltr">Just for what it might be worth, I used a synthetic oil back in late 1959 to see if its resistance to heat would hlep, no change. The only thing that made the difference was a cooler on the trnsmission oil.<br clear="all"><div><div dir="ltr" class="gmail_signature"><p><strong><span color="#000099" data-mce-style="color: #000099;" style="color: #000099;">Never be beaten by equipment.</span></strong></p></div></div><br></div><br><div class="gmail_quote"><div dir="ltr">On Sun, Dec 16, 2018 at 9:25 AM van.mulders.marcel--- via Fot <<a href="mailto:fot@autox.team.net" target="_blank">fot@autox.team.net</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin: 0px 0px 0px 0.8ex; border-left: 1px solid #cccccc; padding-left: 1ex;" data-mce-style="margin: 0px 0px 0px 0.8ex; border-left: 1px solid #cccccc; padding-left: 1ex;"><div><div style="font-family: Verdana,Arial,Helvetica,sans-serif; font-size: 10pt; color: #000000;" data-mce-style="font-family: Verdana,Arial,Helvetica,sans-serif; font-size: 10pt; color: #000000;"><div>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?</div><div>Marcel</div></div></div>_______________________________________________<br>
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