Hey guys,
Buster suggested that I do some research on zinc (and phosphorous) additives, so here's a little of what I've found so far.
The 4A084 is really an old engine design, using a flat tappet cam. When it was designed and built, the zinc content of motor oil was much higher than it is today. Why did they use zinc in the first place? Because it reduces the wear of high pressure metal to metal surfaces, like a flat tappet cam.
So why did the oil manufacturers reduce the zinc? Mostly because most modern engines do not use flat tappet cams, and because the zinc causes problems with the catalytic converters common on all modern gasoline engined automobiles.
Should we use zinc additives in our engines? Good question, Buster. Since we can't readily buy the oil that was meant to be used in our engines when they were built, should we use zinc additives to "restore" it to that zinc level? That's a hard question.
I've never seen an airboat with a catalytic converter, so that is not a concern for us.
Here's some info to consider:
From "Engine Builder":
"It’s more than a coincidence that engine builders have experienced more flat tappet cam failures in the last few years than at any point prior. And that’s because today’s engine oil has a lower amount of anti-wear additives than your flat tappet cam requires in order to keep it spinning freely".
Here's a link to their story.
http://www.enginebuildermag.com/Arti..._got_zinc.aspx
It's good info, and well worth reading, but it still leaves some questions.
I think that THIS link has some of the best info that I've found.
http://www.syntheticwarehouse.com/am..._high_zinc.htm
Amsoil's Original Premium Protection 10W40 is "Heavily fortified with zinc/phosphorus anti-wear additives for maximum protection."
It doesn't need additives, because it's already in there.
I've never used Amsoil, so don't have any reason to promote it, other than it being formulated back when the 4A084 was still in production.
I'm about brain dead from all of the reading that I did on this.
So you guys are welcome to look into it further...
Duane
Bookmarks