[Fot] 1500 Spit rockers

[Ted Schumacher]

Joe & List.  We sell only Harland Sharp and have for 20 years. Good 
product, tons of experience (they were the first ones to develop a 
roller rocker for small block Chev circa 1960) and great tech support. 
Rockers have a feature that oils both the rocker tip and the push rod 
cup. We supply these with bronze rocker shaft  bushings.  You will see 
roller rockers advertised with needle bearings for the rocker shaft.  
There are some issues with needle bearings.  #1- oil has a tendency to 
"fall out"of the needle bearings due to needle bearing design. This is 
fine if you are pulling rocker assembly for inspection regularly (as in 
every week-end). #2 - since the rocker arm rotates only a small distance 
around the rocker shaft, and needle bearings are very hard by design, 
this create the potential for severe shaft wear. Needle bearings are 
great for supporting a spinning shaft, such as internal gear box parts, 
but they ride in lubrication all the time and they are supporting the 
entire shaft, not just a small area of the shaft.  If you have an engine 
that lives at high revs, good size rocker shaft diameter, excellent 
oiling and checked often (smallblock Chevy sprint car engines, NASCAR, 
etc) needle bearings will work (but so does their budget for tear down 
and rebuild). Extremely high ratio rockers unless coupled with very low 
rate valve springs are death on the valve train  Ted


On 7/9/2011 8:12 AM, n197tr4 at cs.com wrote:
>   ART,
>
> you may want to discuss what the engine will be expected to do.
>
> and what the customer expects.
>
> Harland-Sharp is a high volume producer of attractive looking rockers.
>
> GoodParts adds features and benefits to a purpose designed assembly.
>
> APT in Riverside may be able to shed light on what they do for various states
> of tune, as they are a builder of 'small block' engines, as well as a supplier
> of parts.
>
> I have no direct experience with roller rockers, but it seems like a good
> topic of discussion for the FOT. I'd like to learn more.
>
> I know that at least one FOT became convinced that his after market rocker had
> some geometry problems and set them aside.  (USED ON TR3/4 ENGINES) However,
> there is usually more to the story.
>
> Good question, Art.
>
>
>
>
>
>
>
>
>
>
> -----Original Message-----
> From: chasgee<chasgee at aol.com>
> To: riverside<riverside at southslope.net>; fot<fot at autox.team.net>
> Sent: Fri, Jul 8, 2011 8:30 pm
> Subject: Re: [Fot] 1500 Spit rockers
>
>
> http://www.goodparts.com/shop/index.php?categoryID=10
>
> available in two ratios.  Very high quality stuff and Richard stands behind
> his products.
>
> Chuck Gee
>
>
>
>
>
> -----Original Message-----
> From: riverside<riverside at southslope.net>
> To: FOT<fot at autox.team.net>
> Sent: Fri, Jul 8, 2011 4:00 pm
> Subject: [Fot] 1500 Spit rockers
>
>
> Who sells a good quality roller rocker setup?
> art de armond
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-- 
Ted Schumacher
tedtsimx at bright.net
http://www.tsimportedautomotive.com
108 S. Jefferson St.
Pandora, Ohio, USA 45877
Fax: 419.384.3272 (24 Hrs.)
Phone: 800.543.6648 (US&  Canada)
Tech/ Gen. Information/ Worldwide: 419.384.3022