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Re: What is Proper Valvetrain Geometry?
[Re: cudaman1969]
#1685591
10/17/14 10:12 PM
10/17/14 10:12 PM
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Joined: Jul 2013
Posts: 561
USA
B3RE
mopar
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mopar
Joined: Jul 2013
Posts: 561
USA
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On a roller rocker, at 50% of net valve lift, the geometric line from the centerline of the rocker shaft to the centerline of the roller axle should be at 90* to the valve stem. Not the centerline of the shaft to the tip of the valve as some have stated, and as a shoe type rocker is measured.
Mike Beachel
I didn't write the rules of math nor create the laws of physics, I am just bound by them.
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Re: What is Proper Valvetrain Geometry?
[Re: B3RE]
#1685592
10/17/14 10:19 PM
10/17/14 10:19 PM
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Joined: Jul 2013
Posts: 561
USA
B3RE
mopar
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mopar
Joined: Jul 2013
Posts: 561
USA
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Oh, one more thing. The adjuster angle and pivot location should be 90* at 50% also, but is built into the rocker and is what it is. You work with what you have.
Mike Beachel
I didn't write the rules of math nor create the laws of physics, I am just bound by them.
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Re: What is Proper Valvetrain Geometry?
[Re: Hemi Allstate]
#1685595
10/17/14 11:12 PM
10/17/14 11:12 PM
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Joined: Jan 2003
Posts: 32,394
Quicktree
I Win
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I Win
Joined: Jan 2003
Posts: 32,394
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Re: What is Proper Valvetrain Geometry?
[Re: B3RE]
#1685596
10/18/14 12:17 AM
10/18/14 12:17 AM
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Joined: Jan 2004
Posts: 8,275
fredericksburg,va
cudaman1969
master
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master
Joined: Jan 2004
Posts: 8,275
fredericksburg,va
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Quote:
Oh, one more thing. The adjuster angle and pivot location should be 90* at 50% also, but is built into the rocker and is what it is. You work with what you have.
Thank you for the explantion, just trying to follow thru all the BS. Just got my first Hemi and would like to check out this process on the build up.
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Re: What is Proper Valvetrain Geometry? *DELETED*
[Re: cudaman1969]
#1685597
10/21/14 09:55 PM
10/21/14 09:55 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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Post deleted by polyspheric
Boffin Emeritus
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Re: What is Proper Valvetrain Geometry?
[Re: polyspheric]
#1685598
10/21/14 10:15 PM
10/21/14 10:15 PM
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Joined: Jan 2003
Posts: 1,292
Tucson AZ,
MadMopars
OP
pro stock
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OP
pro stock
Joined: Jan 2003
Posts: 1,292
Tucson AZ,
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Quote:
The adjuster angle and pivot location should be 90* at 50% also, but is built into the rocker
It isn't, and you can't.
Can you expand on this?
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Re: What is Proper Valvetrain Geometry? *DELETED*
[Re: MadMopars]
#1685600
10/22/14 11:33 AM
10/22/14 11:33 AM
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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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Post deleted by polyspheric
Boffin Emeritus
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Re: What is Proper Valvetrain Geometry?
[Re: Monte_Smith]
#1685602
10/22/14 09:53 PM
10/22/14 09:53 PM
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Joined: Jan 2003
Posts: 10,010
Frostbitefalls MN (Rocky&Bullw...
gregsdart
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 10,010
Frostbitefalls MN (Rocky&Bullw...
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Quote:
Quote:
i'll bet correcting my geometry will not net anywhere near 46hp with my current combo. that would put me near 700hp with a small flat tappet cam. 
If it helps you 2 hp and only costs a little time it is worth it. Free power is free power.
This can go right along with "nah, I don't degree my cams, its probably close enough"........Im only bracket racing.................... and all those other things that are "close enough".
This is also the reason that stockers with cast intakes, thermo-quads, stock unported iron heads and various other things will embarrass most guys aluminum headed, big cam "race" motors on the track. Its called attention to detail and getting what you can out of a combo.
Monte
Warren Johnson story
Observer, watching Warren test different belts to drive accessories.
"That is probably worth no more than a 1/4 hp, if at all"
Warren;
Maybe, but if I find one hundred things that produce a 1/4 hp, I have gained 25"
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: What is Proper Valvetrain Geometry?
[Re: gregsdart]
#1685603
10/23/14 08:23 AM
10/23/14 08:23 AM
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Joined: Jan 2003
Posts: 32,394
Quicktree
I Win
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I Win
Joined: Jan 2003
Posts: 32,394
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Quote:
Quote:
Quote:
i'll bet correcting my geometry will not net anywhere near 46hp with my current combo. that would put me near 700hp with a small flat tappet cam.
If it helps you 2 hp and only costs a little time it is worth it. Free power is free power.
This can go right along with "nah, I don't degree my cams, its probably close enough"........Im only bracket racing.................... and all those other things that are "close enough".
This is also the reason that stockers with cast intakes, thermo-quads, stock unported iron heads and various other things will embarrass most guys aluminum headed, big cam "race" motors on the track. Its called attention to detail and getting what you can out of a combo.
Monte
Warren Johnson story
Observer, watching Warren test different belts to drive accessories.
"That is probably worth no more than a 1/4 hp, if at all"
Warren;
Maybe, but if I find one hundred things that produce a 1/4 hp, I have gained 25"
thats why stocker motors cost so much, thats why I bracket race. 
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