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Re: Most stable valve train???
[Re: BradH]
#1937268
10/23/15 01:42 PM
10/23/15 01:42 PM
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Joined: Jan 2003
Posts: 2,299
NE Ohio
DoubleD
top fuel
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top fuel
Joined: Jan 2003
Posts: 2,299
NE Ohio
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I guess you have not seen any of Allen Johnsons top fuel set-ups then - he must be a budget racer - just because it appears to be an old design does not mean its antiquated in function.
Last edited by DoubleD; 10/23/15 01:42 PM.
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Re: Most stable valve train???
[Re: DoubleD]
#1937273
10/23/15 01:51 PM
10/23/15 01:51 PM
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Joined: Jan 2003
Posts: 13,402
Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,402
Marion, South Carolina [><]
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I guess you have not seen any of Allen Johnsons top fuel set-ups then - he must be a budget racer - just because it appears to be an old design does not mean its antiquated in function.  They still use springs. http://www.alanjohnsonperformance.com/rocker-assembly/item/76-top-fuel-426-hemi-rockers-parts
CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax
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Re: Most stable valve train???
[Re: DoubleD]
#1937276
10/23/15 01:59 PM
10/23/15 01:59 PM
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Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
BradH
Taking time off to work on my car
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Taking time off to work on my car
Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
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I guess you have not seen any of Allen Johnsons top fuel set-ups then - he must be a budget racer - just because it appears to be an old design does not mean its antiquated in function. I believe you're referring to Alan Johnson, the TF guy, not Allen Johnson, the Pro Stock guy. And all I know is if it's important to keep the rocker stable horizontally on the shaft (not sliding sideways over the valve tip as the loads change), a collar or a solid spacer has got to be far more effective than a spring, which cam compress ('cuz that's what springs do, right?) and let the rocker move around. Seems like a no-brainer to me, but I don't own a Hemi, either.
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Re: Most stable valve train???
[Re: 65 Hemi]
#1937371
10/23/15 04:32 PM
10/23/15 04:32 PM
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Joined: Oct 2007
Posts: 4,213
New York
polyspheric
master
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master
Joined: Oct 2007
Posts: 4,213
New York
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The spring install relies on knowledge of which way the rocker will thrust when loaded - that should be against a hardened and parallel surface, like the shoulder of a stand. I wonder if anyone has tried a radial bearing ("lazy susan") here as thrust control?
The spring goes on the other side of the rocker.
If you assemble it correctly, the rocker's lateral position never moves.
Boffin Emeritus
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Re: Most stable valve train???
[Re: 65 Hemi]
#1937377
10/23/15 04:39 PM
10/23/15 04:39 PM
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Joined: Oct 2007
Posts: 4,213
New York
polyspheric
master
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master
Joined: Oct 2007
Posts: 4,213
New York
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Really curious: all that shiny stuff, color anodizing, Grade 99 hardware, million lb. tensile strength valve cover screws...
and yet, with the exception of Barton, every Gen-2 rocker assembly I've seen has no provision for adjusting the geo of intake and exhaust rockers separately - their shafts are on the same stand. Shim/shorten one, shim/shorten both.
What are people with Stage V, yatta, yatta doing when shimming the stand to correct the intake rockers throws the exhaust geo out the window?
Anticipated response:
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"...what?"
Boffin Emeritus
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Re: Most stable valve train???
[Re: polyspheric]
#1937389
10/23/15 05:08 PM
10/23/15 05:08 PM
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Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
BradH
Taking time off to work on my car
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Taking time off to work on my car
Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
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I wonder if anyone has tried a radial bearing ("lazy susan") here as thrust control? IIRC, Barton's custom T&D setup for the SS/AH Gen II Hemis uses bearings on the thrust side (possibly both sides). As far as the spring deal... if the load imparted on the rocker by the pushrod is always AWAY from the spring side, then I understand why it shouldn't make a difference. I'm not familiar w/ those engines' rocker & pushrod geometry and where it does / doesn't matter. 
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Re: Most stable valve train???
[Re: polyspheric]
#1937458
10/23/15 07:36 PM
10/23/15 07:36 PM
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Joined: Mar 2003
Posts: 9,102
Rogue River, OR
Jeremiah
master
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master
Joined: Mar 2003
Posts: 9,102
Rogue River, OR
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Really curious: all that shiny stuff, color anodizing, Grade 99 hardware, million lb. tensile strength valve cover screws...
and yet, with the exception of Barton, every Gen-2 rocker assembly I've seen has no provision for adjusting the geo of intake and exhaust rockers separately - their shafts are on the same stand. Shim/shorten one, shim/shorten both.
What are people with Stage V, yatta, yatta doing when shimming the stand to correct the intake rockers throws the exhaust geo out the window?
Anticipated response:
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.
"...what?" In short, you are asking why nobody makes a paired rocker shaft setup for the Gen II HEMI engines? Am I interpreting this correctly? It can be hard to see through the woods around here lol.
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Re: Most stable valve train???
[Re: Jeremiah]
#1937469
10/23/15 07:56 PM
10/23/15 07:56 PM
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Joined: Aug 2003
Posts: 43,311
Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,311
Bend,OR USA
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Barton, Jesel and Brad Anderson make paired and individual single sahft rocker systems for the Gen 11 426 race Hemiroid motors  The B.A. parts, individual stainless steel rockers, fit there heads only, I think  They sure are nice and they will exceed 11,000 RPM safely repeatably 
Last edited by Cab_Burge; 10/23/15 07:59 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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