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<div>Why not contact Gearvendors and ask what oil they recommend? They sell a Laycock overdrive for most hot rods and drag cars on the Hot Rod Drag Week event. Most off road racers run their overdrive units. See what they use.</div><div><br></div><div>Barry</div><div><br></div>
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On Monday, December 17, 2018, 8:47:27 AM EST, van.mulders.marcel--- via Fot <fot@autox.team.net> wrote:
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<div><div id="ydpd45cbd6eyiv8758285949"><div><div style="font-family:Verdana, Arial, Helvetica, sans-serif;font-size:10pt;color:#000000;"><div>I don't know what material wet clutch linings in a motorcycle is made of. The clutch material in the overdrive is ressembling a bit the organic material on classic dry clutches (not sintered or cerametallic) : yellowisch, cork aspect.</div><div>Marcel</div><div><br clear="none"></div><hr id="ydpd45cbd6eyiv8758285949zwchr"><div class="ydpd45cbd6eyiv8758285949yqt8554894231" id="ydpd45cbd6eyiv8758285949yqt57002"><div><b>Van: </b>"Duncan Charlton" <duncan.charlton54@gmail.com><br clear="none"><b>Aan: </b>"fot" <fot@autox.team.net>, "van mulders marcel" <van.mulders.marcel@telenet.be><br clear="none"><b>Verzonden: </b>Maandag 17 december 2018 13:36:25<br clear="none"><b>Onderwerp: </b>Re: [Fot] bike engine oil for overdrive gearbox?<br clear="none"></div><br clear="none"><div>Does the wet clutch material in a motorcycle resemble the wet clutch material in the overdrive unit?<div class="ydpd45cbd6eyiv8758285949"><br clear="none" class="ydpd45cbd6eyiv8758285949"></div><div class="ydpd45cbd6eyiv8758285949">Duncan<br clear="none" class="ydpd45cbd6eyiv8758285949"><div><br clear="none" class="ydpd45cbd6eyiv8758285949"><blockquote class="ydpd45cbd6eyiv8758285949"><div class="ydpd45cbd6eyiv8758285949">On Dec 17, 2018, at 2:07 AM, <a shape="rect" class="ydpd45cbd6eyiv8758285949" href="mailto:van.mulders.marcel@telenet.be" rel="nofollow" target="_blank">van.mulders.marcel@telenet.be</a> wrote:</div><br clear="none" class="ydpd45cbd6eyiv8758285949Apple-interchange-newline"><div class="ydpd45cbd6eyiv8758285949"><div class="ydpd45cbd6eyiv8758285949"><div class="ydpd45cbd6eyiv8758285949" style="font-family:Verdana, Arial, Helvetica, sans-serif;font-size:10pt;"><div class="ydpd45cbd6eyiv8758285949">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 class="ydpd45cbd6eyiv8758285949">Marcel</div><div class="ydpd45cbd6eyiv8758285949"><br clear="none" class="ydpd45cbd6eyiv8758285949"></div><hr class="ydpd45cbd6eyiv8758285949" id="ydpd45cbd6eyiv8758285949zwchr"><div class="ydpd45cbd6eyiv8758285949"><b class="ydpd45cbd6eyiv8758285949">Van: </b>"fot" <<a shape="rect" class="ydpd45cbd6eyiv8758285949" href="mailto:fot@autox.team.net" rel="nofollow" target="_blank">fot@autox.team.net</a>><br clear="none" class="ydpd45cbd6eyiv8758285949"><b class="ydpd45cbd6eyiv8758285949">Aan: </b>"fot" <<a shape="rect" class="ydpd45cbd6eyiv8758285949" href="mailto:fot@autox.team.net" rel="nofollow" target="_blank">fot@autox.team.net</a>><br clear="none" class="ydpd45cbd6eyiv8758285949"><b class="ydpd45cbd6eyiv8758285949">Verzonden: </b>Zondag 16 december 2018 23:05:36<br clear="none" class="ydpd45cbd6eyiv8758285949"><b class="ydpd45cbd6eyiv8758285949">Onderwerp: </b>Re: [Fot] bike engine oil for overdrive gearbox?<br clear="none" class="ydpd45cbd6eyiv8758285949"></div><br clear="none" class="ydpd45cbd6eyiv8758285949"><div class="ydpd45cbd6eyiv8758285949">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="ydpd45cbd6eyiv8758285949"><br clear="none" class="ydpd45cbd6eyiv8758285949"></div><div class="ydpd45cbd6eyiv8758285949">I have have heard good things about Redline Shock Proof Gear Oil’s ability to keep gearbox temperatures down: <a shape="rect" class="ydpd45cbd6eyiv8758285949" href="https://www.redlineoil.com/shockproof-gear-oils" rel="nofollow" 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="ydpd45cbd6eyiv8758285949"><br clear="none" class="ydpd45cbd6eyiv8758285949"></div><div class="ydpd45cbd6eyiv8758285949">Duncan</div><div class="ydpd45cbd6eyiv8758285949">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="ydpd45cbd6eyiv8758285949"><br clear="none" class="ydpd45cbd6eyiv8758285949"></div><div class="ydpd45cbd6eyiv8758285949"><br clear="none" class="ydpd45cbd6eyiv8758285949"><div class="ydpd45cbd6eyiv8758285949"><blockquote class="ydpd45cbd6eyiv8758285949"><div class="ydpd45cbd6eyiv8758285949"><span class="ydpd45cbd6eyiv8758285949" style="font-family:Verdana, Arial, Helvetica, sans-serif;font-size:10pt;">On Sun, Dec 16, 2018 at 9:25 AM van.mulders.marcel--- via Fot <</span><a shape="rect" class="ydpd45cbd6eyiv8758285949" href="mailto:fot@autox.team.net" style="font-family:Verdana, Arial, Helvetica, sans-serif;font-size:10pt;" rel="nofollow" target="_blank">fot@autox.team.net</a><span class="ydpd45cbd6eyiv8758285949" style="font-family:Verdana, Arial, Helvetica, sans-serif;font-size:10pt;">> wrote:</span></div><div class="ydpd45cbd6eyiv8758285949"><div class="ydpd45cbd6eyiv8758285949"><div class="ydpd45cbd6eyiv8758285949" style="font-family:Verdana, Arial, Helvetica, sans-serif;font-size:10pt;"><div class="ydpd45cbd6eyiv8758285949"><div class="ydpd45cbd6eyiv8758285949gmail_quote"><blockquote class="ydpd45cbd6eyiv8758285949gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid #cccccc;padding-left:1ex;"><div class="ydpd45cbd6eyiv8758285949"><div class="ydpd45cbd6eyiv8758285949" style="font-family:Verdana, Arial, Helvetica, sans-serif;font-size:10pt;"><div class="ydpd45cbd6eyiv8758285949">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="ydpd45cbd6eyiv8758285949">Marcel</div></div></div>_______________________________________________<br clear="none" class="ydpd45cbd6eyiv8758285949">
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