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  #21  
Old 04-13-2019, 05:08 PM
huntergreen huntergreen is offline
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I would rather change the cats than a camshaft and lifters.
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  #22  
Old 04-13-2019, 06:30 PM
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This guy seems to think ZDDP is not necessarily the answer, but what matters is the film strength

https://540ratblog.wordpress.com/201...-test-ranking/
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  #23  
Old 04-14-2019, 11:55 AM
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Quote:
Originally Posted by Thunderhorse View Post
This guy seems to think ZDDP is not necessarily the answer, but what matters is the film strength

https://540ratblog.wordpress.com/201...-test-ranking/
Yes and no, film strength is great but only really matters for the bearings since in our case the lobes are not under pressurized oil feed. The additives allow a "layer" of zinc to form that wears instead of the parts that is renewed via splash that more modern oils can't provide since they simply do not have an equivalent product in them. The above test was also called out as having some errors on BITOG since it ONLY cares about film strength and not any of the other quite important factors.

This is why a modern oil will wipe out a flat tappet cam but allow crazy tight bottom ends (BMW S engines) to live just fine.
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  #24  
Old 04-14-2019, 12:06 PM
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Originally Posted by striker2237 View Post
Yes and no, film strength is great but only really matters for the bearings since in our case the lobes are not under pressurized oil feed. The additives allow a "layer" of zinc to form that wears instead of the parts that is renewed via splash that more modern oils can't provide since they simply do not have an equivalent product in them. The above test was also called out as having some errors on BITOG since it ONLY cares about film strength and not any of the other quite important factors.

This is why a modern oil will wipe out a flat tappet cam but allow crazy tight bottom ends (BMW S engines) to live just fine.



What about the Castrol with titanium? I suppose that is there to serve a similar function to zinc?
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  #25  
Old 04-14-2019, 12:08 PM
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Quote:
Originally Posted by striker2237 View Post
That is the only reason it is not used, to save the cats. It's also what I meant by use better oil.
The need for high ZDDP went away with the introduction of rollers lifters, flat tappets have not been used in a factory pushrod V8 for years.
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  #26  
Old 04-14-2019, 12:27 PM
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Quote:
Originally Posted by striker2237 View Post
That is the only reason it is not used, to save the cats. It's also what I meant by use better oil.
The need for high ZDDP went away with the introduction of rollers lifters, flat tappets have not been used in a factory pushrod V8 for years.
Then why do racing oils all still use it? It’s not strictly needed it is superior

The major error with that blog is that he does his tests at hot operating temp, while he opines that most wear occurs when cold. He should adjust the testing to reflect that statement.
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Old 04-15-2019, 02:39 PM
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Quote:
Originally Posted by Mojack View Post
I'm liking the sound of that but could the ZDDP (zinc) be a problem for the emissions equipment?
I think the possibility of that is greatly overblown. Maybe if your engine is burning a quart every 400 miles ZDDP might poison the cat but if your engine is like mine where it doesn't use a quart in 7,500 miles no way ZDDP is going to hurt anything.
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  #28  
Old 04-15-2019, 08:36 PM
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Quote:
Originally Posted by Thunderhorse View Post
This guy seems to think ZDDP is not necessarily the answer, but what matters is the film strength

https://540ratblog.wordpress.com/201...-test-ranking/
I haven't been able to find this guys credentials any where. Seems to be a self proclaimed expert..
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  #29  
Old 04-16-2019, 03:43 PM
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I've been adding ZDDP for a couple years now. My engine runs the same as it always has. Scotty Kilmer from Youtube suggested it in one of his segments on the cam lobe problems with the Hemi.
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