[Fot] valve train

[John Styduhar]

The problem I encountered with aftermarket billet rocker arm
pedestals and roller rockers (Harland Sharp) is the geometry of the rocker
arm movement and the resulting sweep of the roller tip over the end of the
valve stem.  The goal is to minimize sweep and center over the valve stem.
If the pedestals are not designed properly in relationship to the tip of
the valve stem, there is excessive or off-center sweep and reduce valve
opening and possible valve damage.  It's relatively easy to check roller
tip sweep.  I found that If you try to move the rocker shaft axis closer to
the valve stem to better center the sweep or reduce the sweep, the pedestal
mounting studs get in the way.  I ended up milling the base of the
pedestals to improve the centering of the sweep but sacrificed a few
thou of valve lift.   I don't think the minor increase in roller rocker
ratio had much to do with the problem.
P.S. I bought a set of custom length tubular pushrods from Ted and they are
working great.


On Tue, Sep 17, 2013 at 9:27 AM, Ted Schumacher <tedtsimx at bright.net> wrote:

>  John, you fell victim to the "someone sold the wrong Ford lifter"
> problem. We have run into this a  couple times where the lifter cup and
> push rod ball don't "like each other".  We supply roller rockers
> ($285/set), hardened shaft ($69) and tubular alloy pushrods ($69.95).
> Pushrods available in 2 different tube diameters - 5/16"and 3/8" and
> whatever length needed.. We will also produce billet pedestals if you want.
> A caution about the use of needle bearing pivots in the rocker arm.  Needle
> bearings, by design, allow oil to "fall out"of the bearings. And they are
> extremely hard. Needle bearings are great support for a rotating device
> such as a shaft where it rotates completely. But, a rocker arm only moves
> through a small part of an arc and can cause excessive wear to shaft. Our
> roller rockers are bushed with a design that forces oil to lube both the
> roller tip and pushrod cup. Please let me  now if we can help. Thanks, Ted
>
>
>
> On 9/16/2013 7:50 PM, John Wagner wrote:
>
>      As some of you might know the purple TR3 had it's share of valve
> train problems at RA. Turns out the plug in the rocker shaft came loose and
> starved no. 1 rocker arm, we missed the K cup S---. But thanks to Joe we
> were able to make the group 2 race. After some  close inspection of all
> related parts, I found  something interesting. We use .875 FE block Ford
> lifters (352-428) This lifters has a 5/16 dia. push rod cup,triumph push
> rod are much larger, closer to 1/2 dia.  The triumph push rods never
> created a problem but it is not right. The push rods have no sign of ware,
> other then a shinny ring. For all of you that use |Ford lifters You might
> want to check this. Our plan know is to up grade to roller rockers and new
> push rods. I talked to Richard Good about a complete assembly for TR2-4.
> He has rockers and shafts but no pedestals,"BUT" he is willing to design
> and build billet pedestals. So If anyone out there in FOT land that might
> be interested in a kit or just new "Good" pedestals send him a note.
>     Now for the big question, Ford used two types of lifters the shell
> type,like we use or a solid ,hour glass style with about a 1.5in. shorter
> push rod, so if we have to replace push rods, why not go with the solid
> lifters (about $80),yes there are a little heavier,but the rod will be
> lighter and much more stronger. WHAT SAY YOU.
>
>       Thank you
>      John Wagner
>      Just the wrench
>
>
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> --
> Ted Schumachertedtsimx at bright.nethttp://www.tsimportedautomotive.com
> 108 S. Jefferson St.
> Pandora, Ohio, USA 45877
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