RC Fuels Nitromethane, Castor Oil, Synthetic, heli fuel, 4 stroke, etc...Fuel Q&A is here!

Zinc Additive

Old 09-28-2015, 02:29 PM
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Default Zinc Additive

Would an automotive zinc additive do anything for model fuels ,

Im guessing it would be good for diesels with their high pressures ?


May be good or bad , good for a plain bearing diesels , or bad for glow plugs and ballraces

This ZDDP reacts under heat and load to create a sacrificial film that protects critical places like cam to flat follower with high spring pressure , info is all available

Why havnt the model people got a hold of it ?

Last edited by 123Cat; 09-29-2015 at 12:49 PM.
Old 10-07-2015, 08:07 PM
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Short version of the story, Snake Oil. Most people have not embraced the concept because we know better.
Old 07-03-2018, 05:29 PM
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Zddp has worked very well for flat tappet valve actuation systems in automotive, marine, aircraft, motorcycle and industrial engines for decades. With the implementation of catalytic convertors however there came a conflict. The phosphates and zinc were poison for the convertors. As a result, the automakers moved to roller type tappets which also eliminated friction snd slightly improved fuel economy.

Now, model engines. The two stroke poppers have no cam/lifter interface with the extreme pressure l, sliding contact and benefit little from that quality as imparted from zddp.
Four strokes are another story. They do indeed have that condition and can well benefit from the extreme pressure qualities. Zddp is not compatible for mixing in the fuel

Castor oil has similar properties and is indeed compatible. It only takes a small percentage in the oil package to get the needed extreme pressure quality.

Zddp is still used in oils run in flat tappet engines. Without the Zddp or similar additive, excessive cam /lifter wear can be a problem.

Zddp has long served and works well where needed.

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