[DeTomaso] Rocker installation

[Tomas Gunnarsson]

I'd want the roller to hit the hat pretty close to the center anyway and the
hat thickness would demand even longer pushrods. Seems better to fix it
without hats in my mind.

Tomas

-----Original Message-----
From: detomaso-bounces at realbig.com
[mailto:detomaso-bounces at realbig.com]On Behalf Of Henrik Svensson
Sent: den 17 maj 2010 20:01
To: JDeRyke at aol.com; detomaso at realbig.com
Subject: Re: [DeTomaso] Rocker installation


Hi

Then I'm on the right track when looking at adjusting the rods, I guess
that's the only part that is possible to adjust to get that kind of change?

I was told there are some kind of "hat" to place on top of the valve to get
a bigger surface for the roller? Anything you recommend or not?

Thanks all!

Henrik



-----Ursprungligt meddelande-----
Från: detomaso-bounces at realbig.com [mailto:detomaso-bounces at realbig.com] För
JDeRyke at aol.com
Skickat: den 17 maj 2010 19:50
Till: detomaso at realbig.com
Ämne: Re: [DeTomaso] Rocker installation

Rocker geometry changes with aftermarket parts is common,and its very
important to get it right before running the engine hard. Complete engine
failure
sometimes results. Head thickness, gasket thickness, valve stem lengths,
rocker type and what cam you use all influence the geometry. FWIW, as Tomas
said, intake and exhaust valve stems are usually different lengths. Note
that
this happens with all-stock parts if the heads have been at all machined,
even for a simple valve grind.

Get one adjustable pushrod to check the lengths you need. Adjustable
pushrods are not for running in an engine; ther usually aren't stiff enough
and
are always too heavy. Use a felt pen on a valve stem tip, assemble that
cylinder and roll the engine thru two complete revolutions; the tip will
scrub off
the marking ink and you'll clearly see the contact area. Then you can order
the correct length pushrods. or have some made up locally. Remember, they
must still be hardened on the upper ends. There are lots of cam tech sites
that explain whats going on here, and how to correct it by varying pushrod
or
valve stem length. Good luck- J Deryke
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