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Zinc content in oil
AshimotoK0:
A guy called 'Oldgeezer' on HondaTwins.net posted this comment to a guy who's top end was toast when he took the cam cover off (looks like a CB360/CJ360 engine). I have never heard about zinc content or additives before. Any ideas? I am not well up on oil technology myself.
Quote from 'Oldgeezer'
"What oil have you been using? It needs 1200ppm zinc to keep cam ware in check. Valvoline VR-1 & Mobil 1 4T has proper amount. Car oil only has 600-800ppm. When you install a new cam, use zinc booster to raise zinc to 1700ppm for 500 miles, then replace the oil with standard 1200ppm".
I found this :
http://www.ebay.co.uk/itm/Edelbrock-1074-High-Performance-Zinc-Additive-Engine-Oil-Supplement-/111931607231?hash=item1a0fa4c8bf:g:nc4AAOSwu1VW4Whu
Green1:
Isn't that why Brian uses Diesel oil?
K2-K6:
Spooky connection here Ash as I read your post over on the black bomber thread this morning and thought of this subject and of opening a thread about it.
Usually listed in content as ZDDP, Zinc Dialkyl Dithio Phosphate, it has some pretty unique properties and effects, especially for older engines.
It's now being almost totally excluded from modern engine oils as when passed into exhaust stream it will have a destructive effect on catalytic converters and the like.
Basically it floats around in engine oil and just exists without doing much until it comes under extreme mechanical pressure in situations like camshaft lobes. It typically prevents metal spalling and pickup (the destruction of machined surfaces) when the shear capability of the oil is exceeded and can have a hugely important function in preventing wear starting.
I'm a fully paid up, anorak wearing advocate of ZDDP in oils ;) as I look after a number of engines that would be considered in need of specific consideration in this regard.
AshimotoK0:
--- Quote from: K2-K6 on June 18, 2017, 04:49:14 PM ---Spooky connection here Ash as I read your post over on the black bomber thread this morning and thought of this subject and of opening a thread about it.
Usually listed in content as ZDDP, Zinc Dialkyl Dithio Phosphate, it has some pretty unique properties and effects, especially for older engines.
It's now being almost totally excluded from modern engine oils as when passed into exhaust stream it will have a destructive effect on catalytic converters and the like.
Basically it floats around in engine oil and just exists without doing much until it comes under extreme mechanical pressure in situations like camshaft lobes. It typically prevents metal spalling and pickup (the destruction of machined surfaces) when the shear capability of the oil is exceeded and can have a hugely important function in preventing wear starting.
I'm a fully paid up, anorak wearing advocate of ZDDP in oils ;) as I look after a number of engines that would be considered in need of specific consideration in this regard.
--- End quote ---
Wow ... brilliant reply .. I knew somebody on here would be well up on it.
There is a Dutch guy too on HondaTwins called 'Jensen', who lets put it as politely as I can "does not suffer fools gladly" but his tech posts (anoraky if you insist) make wonderful informative reading. He did a whole set of posts on running the Black Bomber K0 engine on fully synthetic oil. Kettle738 on here (Mick) told me that the early bomber oil pump wasn't very high capacity and the last lobe to be fed on the twin cams tended to suffer from pitting etc. (exhaust cam)..... Jensen also identified this and hence his 'trials'.
http://www.hondatwins.net/forums/55-engine-discussion/33075-full-synthetic-oil-fresh-build-cb450-k0-engine-mile-0-a.html
K2-K6:
It'll take me a while to read through that, seems really interesting with him offering a very factual account of what happens rather than speculation.
It's funny that oil has such a small remit, to stop the engine wearing with part of that to keep it cool, but such a massive subject to discuss and achieve that.
As Jensen says though, it's sometimes difficult to discuss on forum without being deluged by other's assumed information and just plain preferences not backed up by scientific data of any real standing. I can see his point in taking his time to write intelligently about it and having non qualified criticism dispensed would make you not want to bother. Looks like he's making a valuable contribution.
I don't mind posting what I've worked through and hope we may be left alone over in anorak's corner to go through various areas of the subject if you're up for it. :)
I believe that the best solution to protect any engine should be up for discussion with nothing taken off the table for spurious reasons.
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