-------- Original Message --------
Subject: Re: Pushrods and rocker pedestals
Date: Thu, 10 Jul 2003 00:06:24 -0400
From: Don Malling <dmallin@attglobal.net>
To: Sally or Dick Taylor <tr6taylor@webtv.net>
References: <14979-3F0CDB9D-139@storefull-2133.public.lawson.webtv.net>
Hi Dick or anyone,
At what point in travel of the rocker arm's arc should the valve stem be
centered on the roller?
Don Malling
Sally or Dick Taylor wrote:
> From: gln@worldpath.net (Nick Gemas) Date: Wed, Jul 9, 2003, 10:16pm
> (PDT+3) To: 6pack@autox.team.net Subject: Re: Pushrods and Rocker
> Pedestals
> Dick,
> < The problem I'm having is , I bought a set of
> roller rockers and upon installing them I checked to see if they are
> centered on the valve stem when run through a cycle and they are
> centered at the beginning of a cycle then move about .070 " out away
> from the rocker shaft. I'm trying to get the contact patch of the roller
> tip perfectly centered on the valve stem...>
>
> Nick---The area where the rocker pads, or rollers in your case, make
> contact with the valve stem must go thru an arc when opening the valves.
> The more the valves open, the larger the arc. There is some geometry
> involved here that requires that the pedestals be at a certain height
> before such movement takes place, so as to lessen the amount of
> off-centering and side load placed on the valve stems and their guides.
> (Rollers at the rocker ends would reduce the frictional wipe, of course)
>
> At this point I will defer to those whose business it is to supply a
> more fitting solution.
>
> Dick
/// 6pack@autox.team.net mailing list
/// or try http://www.team.net/cgi-bin/majorcool
/// Archives at http://www.team.net/archive
|