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Re: Indy SR heads Geometry isuue (long) *DELETED*
[Re: shoebox]
#1033817
07/17/11 03:33 PM
07/17/11 03:33 PM
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Anonymous
Unregistered
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Anonymous
Unregistered
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Post deleted by crabman173
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Re: Indy SR heads Geometry isuue (long)
[Re: ]
#1033818
07/17/11 04:14 PM
07/17/11 04:14 PM
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Joined: Nov 2004
Posts: 3,544
Syracuse,NY
CompWedgeEngines
master
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master
Joined: Nov 2004
Posts: 3,544
Syracuse,NY
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David, I think we all lived thru that deal!....gonna send ya a PM later 
RIP Monte Smith
Your work is a reflection of yourself, autograph it with quality.
WD for Diamond Pistons,Sidewinder cylinder heads, Wiseco, K1 rods and cranks,BAM lifters, Morel lifters, Molnar Technologies, Harland Sharp, Pro Gear, Cometic, King Engine Bearings and many others.
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Re: Indy SR heads Geometry isuue (long)
[Re: shoebox]
#1033819
07/17/11 05:08 PM
07/17/11 05:08 PM
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Joined: Oct 2007
Posts: 4,206
New York
polyspheric
master
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master
Joined: Oct 2007
Posts: 4,206
New York
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Unless you have an actual Miller product, you cannot have mid-lift @ 90° etc. geometry on both rocker levers. If you achieve this on the long (valve-side) lever, the short (pushrod-side) lever will have asymmetrical motion B & A 90°, which will reduce maximum lift slightly. The highest lift is some compromise on both sides, and YMMV.
A rocker set at mid-lift will have this scrub pattern:
The scrub path begins at 0% lift with the valve closed and the roller closest to the rocker shaft, and to the stem tip's near edge (not the center).
As the valve opens, the roller walks away from the rocker shaft toward the stem center.
Its path is centered on the stem tip at 25% lift (but this may not be the tip's actual center).
It reaches its farthest point away from the rocker shaft at 50% lift.
As the valve closes, the roller walks back, reaching its own center again at 75% lift, and the same closest point to the shaft at full lift.
The width of the scrub path should be very small, but it cannot be shortened more than it's actual length vs. lift permits - which is determined by the triangle formed by the lever and lift.
I wrote an .xls program that generates ideal scrub in inches and degrees of sweep from known rocker dimensions - e-mail for a copy.
Boffin Emeritus
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Re: Indy SR heads Geometry isuue (long)
[Re: shoebox]
#1033821
07/17/11 06:33 PM
07/17/11 06:33 PM
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Joined: May 2008
Posts: 5,399
Aurora, Colorado
451Mopar
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master
Joined: May 2008
Posts: 5,399
Aurora, Colorado
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Quote:
little hyjack here but:
the roller tip should be dead center and half lift?
I like to use 3/4 lift. At 3/4 lift I like to see the roller tip centered and the pushrod in-line with the adjuster. This puts the rocker in a better position when the springs are closer to full load, and closer to max lift.
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