<VV> OIL

[Frank DuVal]

I agree, hydraulic or solid, the same pressure is exerted on the cam.

Maybe lzdick meant roller cam?

Frank DuVal

On 1/6/2012 4:10 PM, Mark Durham wrote:
> Seth, it does not matter if a engine is hydraulic or not. The core
> issue is the amount of pressure on the cam to lifter faces caused by
> spring pressure at the valves. The pressure was mitigated when the
> engine designers went to roller cams.
> The only difference between a solid lifter and hydraulic is the
> hydraulic lifter automatically adjusts for wear on each revolution of
> the cam. solid lifters need manual adjustment. So both would need zddp
> to bring the levels to what was needed for the engine design.
> Mark Durham
>
> Sent from my Windows Phone
> From: Sethracer at aol.com
> Sent: 1/6/2012 10:02
> To: lzdick at comcast.net; virtualvairs at corvair.org
> Subject: Re:<VV>  OIL
> Rich - Virtually all Corvair use Hydraulic lifters. Part of your reference
> note says there in no need for it in Hydraulic-lifter motors. Why are folks
>   worrying about the ZDDP amounts, if it isn't needed? Or is it just as
> important  because we are talking about the lifter to cam lobe face contact,
> which is  almost the same with a Hydraulic vs. solid-lifter set-up. I can
> understand that  it is not-needed in a roller-cam motor. Any thoughts?
>
> -Seth Emerson
>
>
> In a message dated 1/5/2012 9:37:46 A.M. Pacific Standard Time,
> lzdick at comcast.net writes:
>
> FYI:  The origination of ZDDPlus was by a man who operates a facility  that
> evaluates DNA (similar to where samples are sent on your favorite cop TV
> program...CSI, etc.).  He compared 'SF' oil with current oils (now 'SM')  and
> determined what was missing, chemically...thus the creation of  ZDDPlus.
> I've been distributing the product for quite a few  years and it is in every
> one of my solid tappet motors (no need for hydraulic  lifters and a no-no'
> for catalytic  converters).