<html><body><div style="font-family: Verdana, Arial, Helvetica, sans-serif; font-size: 10pt; color: #000000"><div>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.</div><div>Marcel</div><div><br></div><hr id="zwchr" data-marker="__DIVIDER__"><div data-marker="__HEADERS__"><b>Van: </b>"fot" <fot@autox.team.net><br><b>Aan: </b>"fot" <fot@autox.team.net><br><b>Verzonden: </b>Zondag 16 december 2018 23:05:36<br><b>Onderwerp: </b>Re: [Fot] bike engine oil for overdrive gearbox?<br></div><br><div data-marker="__QUOTED_TEXT__">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.<div class=""><br class=""></div><div class="">I have have heard good things about Redline Shock Proof Gear Oil’s ability to keep gearbox temperatures down: <a href="https://www.redlineoil.com/shockproof-gear-oils" class="" target="_blank">https://www.redlineoil.com/shockproof-gear-oils</a> . 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.</div><div class=""><br class=""></div><div class="">Duncan</div><div class="">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. </div><div class=""><br class=""></div><div class=""><br class=""><div><blockquote class=""><div class=""><span style="font-family: Verdana, Arial, Helvetica, sans-serif; font-size: 10pt;" class="">On Sun, Dec 16, 2018 at 9:25 AM van.mulders.marcel--- via Fot <</span><a href="mailto:fot@autox.team.net" target="_blank" class="" style="font-family: Verdana, Arial, Helvetica, sans-serif; font-size: 10pt;">fot@autox.team.net</a><span style="font-family: Verdana, Arial, Helvetica, sans-serif; font-size: 10pt;" class="">> wrote:</span></div><div class=""><div class=""><div style="font-family: Verdana, Arial, Helvetica, sans-serif; font-size: 10pt;" class=""><div class=""><div class="gmail_quote"><blockquote class="gmail_quote" style="margin: 0px 0px 0px 0.8ex; border-left: 1px solid #cccccc; padding-left: 1ex;"><div class=""><div style="font-family: Verdana, Arial, Helvetica, sans-serif; font-size: 10pt;" class=""><div class="">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 class="">Marcel</div></div></div>_______________________________________________<br class="">
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