Re: [Amc-list] Amc-list Digest,- Zinc oils/roller engine/scraper

[Wrambler242@xxxxxxxxxxx]

Ken,
   The phrase "roller engine" refers to the lifter tip.
All of our old engines are flat tappet or "non roller" engines.
   The zinc and phosporus compounds coat the cam and help protect the cam from wear. as well as protecting things like dist drive gears etc;
    The Zinc needs are a lot lower on a Roller engine since the rollers roll on the cam.
Using high zinc compounds in a roller engine is not needed. 
     if it is carb'd and lacking thigns like cat converter and O2 sensor, then it may help engine life.
The theory we have bouncing around is that the zinc was pulled down in the additive package because it coats Oxygen sensors and cat converts and shortens their life.

    As a side note, Back in the mid eighties when the Oxygen sensors started becoming main stream I was told at a factory training session that Oxygen sensors were to be replaced at about 40-60K. I can't remember the exact mileage or if it was a renault or nissan training session..it's been 20 years.  I remember the manufacturer quickly backpedaled on this when the EPA told them that at the mileage point they suggested replacement that it was to be covered under emmisions warranty! No way were they going to buy all those O2 sensors!
   I never saw and official recomendation for O2 replacement under maintenance again. I usualy swap out O2 sensors between 60 and 100K, early if I see mpg drops.
    I guess I've wandered off the original answer.
Sorry, I tend to do that...

--
Mark Price
Morgantown, WV
1969 AMC Rambler, 4.0L, EFI, T-5
2004 Grand Cherokee Laredo, 4.7L, Quadratrc II
" Chronic Pain Hurts"

 -------------- Original message ----------------------
From: ksiroonian@xxxxxxx
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> Hey guys, ?Thanks for all the? great threads and info on the oils with zinc. I 
> will start using that wall mat pre 88 or the diesel engine oil in my pre 88 
> cars. $9.19 a gallon for the diesel oil is not bad, 1.39 is good too. I have 
> been using fram filters for years and never had a problem?in 40 years,?but i do 
> read the threads of how much everyone hates Fram.
> ok for the non engine tech types here, like me, what is a roller engine versus 
> non roller or whatever that makes the zinc not necesary?? is it overhead valve, 
> versus overhead cam? Never took a motor apart so I hae no idea, but I may too to 
> try sometime soon when i restore my dads 74 ambo 360, sitting for many years. 
> what are are amc?engines-where is the roller thing??and what is a crank scraper? 
> In quiring minds would like to know... regards.
> and thanks,
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