SOHC.co.uk Forums > Anorak's Corner
Zinc content in oil
AshimotoK0:
Fire away ! This section was created by Steve to allow this type of discussion. I won't be much use here though as I know very little about oil technology but agree it's the lifeblood of the engine and warrants an in depth discussion. I am pretty sure Bryan will have an input too.
K2-K6:
I've got to page 7 of Jensen's posting, some very interesting additions coming in there.
Both you and Mike in an early post reference Bryan's view on oil for these old bikes, I think he's right on the ball for getting that spec to people asking the, what oil should I be using question. For people wanting a straight up recommendation it couldn't be more simple, and those oils mostly would have a zinc component as they have no attachment to current engines which effectively have their oil components legislated via emissions regs etc.
I think here we should look at if anything better is available and if so, why. Hopefully it may even get some more insightful contributions to debate.
I'll get off and read the rest of the Jensen case study to see where he got.
Bryanj:
I used Silkolene Transfleet 10w40 commercial diesel oil because it had the same specs on the tin as Honda wrote in the handbooks for all the sohc motors, also the transport firm i worked for used it in there trucks so it was free---the modern ones use fully synthetic long drain(200,000 Km) oil which is no good for the bikes but works fine in the L200 and Peugeot 406HDI
Silcolene is now Fuchs and i have never had a decent reply as to what is the equivalent of the Transfleet but not bothered as i have about 40 gallons stashed---should see me out
AshimotoK0:
--- Quote from: K2-K6 on June 18, 2017, 11:02:55 PM ---I've got to page 7 of Jensen's posting, some very interesting additions coming in there.
Both you and Mike in an early post reference Bryan's view on oil for these old bikes, I think he's right on the ball for getting that spec to people asking the, what oil should I be using question. For people wanting a straight up recommendation it couldn't be more simple, and those oils mostly would have a zinc component as they have no attachment to current engines which effectively have their oil components legislated via emissions regs etc.
I think here we should look at if anything better is available and if so, why. Hopefully it may even get some more insightful contributions to debate.
I'll get off and read the rest of the Jensen case study to see where he got.
--- End quote ---
All hats off to Steve for creating this section because on other sites, this techy info gets buried or lost and hard to locate. There is a wealth of info on the USA site and also HondaTwins.net but it's sometimes extremely difficult to locate. BTW 'Jensen' is also on Honda305.com but has had to switch to 'Jensey' because his original identity got lost somewhere down the line.
Lets all work to make this section and the Dropbox links for documentation an easily accessible 'go-to' for tech stuff on our bikes
K2-K6:
I've finished reading Jensen's post to date, it may be worth discussing that in a separate thread to avoid some of the very interesting stuff getting lost in just straight oil subject.
To talk more about ZDDP and how it relates to other additives, http://www.experimentalaircraft.info/articles/engine-lubrication-6.php given a front end overview of the different properties we can consider.
Basically, as I see it, the zinc interaction is really the last line of defense for our metal components in situations of the oil film breaking down. Know as anti wear, and trying to prevent damaged in very extreme circumstances.
Friction Modifiers, principally Molybdenum disulphide, work in the area of duress prior to reaching "extreme " and it is this component I feel is undesirable for our wet clutches. It appears to be accumulative, so could build up in clutch materials and promote friction release, which we don't want.
Commonly listed as Molly, Mollyslip, Modtc etc in oil listing.
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