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Re: [Shop-talk] Oil analysis - Blackstone

To: John Miller <jem@milleredp.com>
Subject: Re: [Shop-talk] Oil analysis - Blackstone
From: Bob Spidell <bspidell@comcast.net>
Date: Sun, 26 Jun 2011 15:49:00 -0700
You are correct, of course.  I was thinking of roller cams when I wrote 
'hydraulic' (shouldn't post so late at night, I 
guess).

Thanks for setting that straight.

Bob

On 6/25/2011 9:53 PM, John Miller wrote:
>> By all accounts, a non-issue unless you're running a pushrod engine
>> with solid, 'flat' lifters. There are reports of premature cam
>> failures on this type of engine, but I haven't heard of any problems
>> with hydraulic lifter or OHC engines (which is pretty much all newer
>> engines).
>
> No, any 'flat-tappet' - that is, mechanical or hydraulic lash adjustment but 
>non-roller lifter sliding on cam lobe - 
> engine is at risk from reduced ZDDP levels.
>
> As are some OHC motors, typically those running stiffer-than-stock 
>valvesprings with aftermarket cams on bucket or 
> other sliding-type lifters.
>
> There's lots of good reasons to build your engines with roller-type valve 
>actuation hardware where possible, and this 
> is just another.
>
> IIRC API SJ was the last really 'good' oil, SL had half the ZDDP, SM was 
>halved again from SL, and I now see an SN and 
> I have no idea what it's got.
>
> John.
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-- 
*******************************************************************
Bob Spidell           San Jose, CA            bspidell@comcast.net

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