This is what my ex-boss across the street at www.dtsdyno.com explained why
the racers run the valve lift VERY close to 'coil bind' so each cycle the
spring nearly collapses fully to dampen the oscillations . . . they try to
match the springs so they are all within a thou' or two. Something about a
machine with lasers and stuff to observe this phenomena?
-Bob
-----Original Message-----
From: Forward Look Mopar Discussion List
[mailto:L-FORWARDLOOK@xxxxxxxxxxxxx] On Behalf Of Eastern Sierra Adjustment
Svc
Sent: Thursday, September 03, 2009 4:17 PM
To: L-FORWARDLOOK@xxxxxxxxxxxxx
Subject: Re: [FWDLK] Ain't it the truth....
The engine may be 'turning' 7K rpm, but, I wonder what the time-frame
is, for the cycling of the valve spring's action?
It would have been neat to have had a high-speed 'clock' operating,
alongside the valve spring, to observe
the passage of micro-seconds.
Neil Vedder
William Huff wrote:
> Pretty amazing how much action there is in a microsecond. That looked
> like single valve spring engine going 8000 RPM. Am I out of the loop,
> is that how modern engines are built? Seems contrary to what we used
> a few dozen years ago.
>
> This one was on the same You tube page. Even though there is still a
> lot of motion, the inner vavle spring and the oscillation damper seem
> to quiet things down a bit. Don't know what the after market springs
> have, but my Mopar Performance cams have always come with the damper
> inside if you get a Hemi grind or above with single springs.
>
> http://www.youtube.com/watch?v=i_NpzU4pGjc&feature=related
>
>
> Bill Huff
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