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turcoysf100
Zinc oil additive


Do I need to add zinc to my early hemi street rod? I am using 10/40 valvoline now.
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on: Sat 14 of Feb, 2009 [17:06 UTC] reads: 31906

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MattW
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Re: Zinc oil additive
on: Thu 26 of Feb, 2009 [13:05 UTC] score: 0.00
From what I read you do need zinc for non-roller cammed motors, I guess it hardened the surface of the camshaft and made it last much longer. The good news is STP oil additive is still full of it, says right on the bottle and you can call them to verify it, it also happens to be the cheapest and easiest to get additive I have found, we use to use it as an assembly lube also. Good Luck MattW

> Do I need to add zinc to my early hemi street rod? I am using 10/40 valvoline now.

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39plymouthP8
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Re: Zinc oil additive
on: Tue 17 of Feb, 2009 [19:35 UTC] score: 0.00
> Do I need to add zinc to my early hemi street rod? I am using 10/40 valvoline now.

I am building a 241 Dodge Hemi and am running solid Lifters, what oil is needed?

Todd

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39plymouthP8
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Re: Re: Zinc oil additive
on: Tue 17 of Feb, 2009 [19:37 UTC] score: 0.00
> > Do I need to add zinc to my early hemi street rod? I am using 10/40 valvoline now.
>
> I am building a 241 Dodge Hemi and am running solid Lifters, what oil is needed? I am running an Isky cam.
>
> Todd

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39plymouthP8
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Re: Re: Re: Zinc oil additive
on: Tue 17 of Feb, 2009 [19:43 UTC] score: 0.00
> > > Do I need to add zinc to my early hemi street rod? I am using 10/40 valvoline now.
> >
> > I am building a 241 Dodge Hemi and am running solid Lifters, what oil is needed? I am running an Isky cam. I was figuring on using a 5w30 Mobile or valvoline.
> >
> > Todd

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DaveBlakeman
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Re: Zinc oil additive
on: Mon 16 of Feb, 2009 [17:43 UTC] score: 0.00
> Do I need to add zinc to my early hemi street rod? I am using 10/40 valvoline now. If you are breaking in a new Isky cam it is a requirement to use an oil wih zinc.They list only maybe four acceptable oils or an additive from GM.You can probably go on the Iskenderian site and read up more about this.

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George
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Re: Re: Zinc oil additive
on: Tue 17 of Feb, 2009 [14:25 UTC] score: 0.00
> > They list only maybe four acceptable oils or an additive from GM.

GM EOS dissapeared for a while a year or so back. Word was it was reformulated w/o zinc.

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Don
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Re: Zinc oil additive
on: Mon 16 of Feb, 2009 [17:42 UTC] score: 0.00
> Zinc is good for all engines, not so good for emmission systems (cats). Oil listed as API SM is capped at 800ppm zddp,API SL (pre cat convertors) can have as much as 1100 ppm zddp (which sould be more than enough for any street engine), oils for diesal engines can have as much as 1300 ppm zddp (still have flat tappets and operate under heavy loads), and some high dollar spiecalty and racing oils can have as much as 1800 ppm zddp.

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39plymouthP8
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Re: Zinc oil additive
on: Sun 15 of Feb, 2009 [14:56 UTC] score: 0.00
> Do I need to add zinc to my early hemi street rod? I am using 10/40 valvoline now.

George;
I guess I don't understand why we need the Zinc in the oil. My understanding metal is metal, aluminum is aluminum. We are putting new parts in our hemis.

I understand the harder valve seats for the unleaded nowadays. Current oils have evolved along with fuels, to run cleaner longer and less maintenace. We do not need to grind valves anymore because of these advances and motors, vehicles are not uncommon to find with 200-300 miles.

I'm wondering if we are not trying to fix something that is not broken. I remember when we ran large toerances and ran thick oils to fill these voids thinking that was best, now there calling for tighter tolerances.

Todd

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George
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Re: Re: Zinc oil additive
on: Sun 15 of Feb, 2009 [23:13 UTC] score: 0.00
> > Do I need to add zinc to my early hemi street rod? I am using 10/40 valvoline now.
>
> George;
> I guess I don't understand why we need the Zinc in the oil. My understanding metal is metal, aluminum is aluminum. We are putting new parts in our hemis.
>
> I understand the harder valve seats for the unleaded nowadays. Current oils have evolved along with fuels, to run cleaner longer and less maintenace. We do not need to grind valves anymore because of these advances and motors, vehicles are not uncommon to find with 200-300 miles.
>
> I'm wondering if we are not trying to fix something that is not broken. I remember when we ran large toerances and ran thick oils to fill these voids thinking that was best, now there calling for tighter tolerances.
>
> Todd

Maybe. The main reason zddp was in oil was the high friction of non roller cams. Supposedly whatever replaced zinc is adequate. There have been a number of publicised failures of new cams fairly short time after initial start up. But they seem to be BB Chevy's running high spring loads & it might be a matter of bad cams supplied by one unnamed company. Rumors of substandard blanks from China. It maybe a rerun of the old rumor of having to use lead substitute to keep your valve seats from rapid wear with unleaded gas. As long as CF & CI-4 oil is available, I'm using it.

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George
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Re: Zinc oil additive
on: Sat 14 of Feb, 2009 [18:23 UTC] score: 0.00
> Do I need to add zinc to my early hemi street rod? I am using 10/40 valvoline now.

If you don't have a roller cam, yes you do! Wal-mart house brand diesel oil 15W-40 is still(last time I looked) the CI-4 with zinc, there is conflicting info as to weather the new CJ-4 has any or not. Wal-Mart has been stocking Accel brand 10W-40 CF rated oil that is marked "For pre '88 cars only" it should have zddp in it. There's stuff called ZDDP+ that might get the job done.

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51Coupe
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Re: Re: Zinc oil additive
on: Tue 17 of Feb, 2009 [20:43 UTC] score: 0.00
Go to http://www.zddplus.com and check there tech brief#2 dated May 13,2008. rolleyes


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