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Re: W2 stroker build - geometry problems me thinks... [Re: Diplomat360] #3031963
04/08/22 07:43 PM
04/08/22 07:43 PM
Joined: Jan 2005
Posts: 2,540
Milwaukee WI
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TRENDZ Offline
master
TRENDZ  Offline
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Joined: Jan 2005
Posts: 2,540
Milwaukee WI
Here is a rocker I made for an early hemi with long valves and .660 lift. I used the half lift theory of geometry for design purposes. Photo angles aren’t great, but the geometry looks great throughout the full travel. This prototype is the basis for the actual rockers that will be made out of 7075 aluminum. Valve sweep is minimal and adjuster angle is spot on. The engine will definitely need custom valve covers.

DEA30762-FE7A-4254-A0E4-B72D74705D26.jpegEA2D3829-F299-4519-B397-B83E3AE8067A.jpegFF2E5DD7-43B5-4CDB-AADA-731668844887.jpeg

"use it 'till it breaks, replace as needed"
Re: W2 stroker build - geometry problems me thinks... [Re: Diplomat360] #3032310
04/10/22 12:00 PM
04/10/22 12:00 PM
Joined: Jan 2003
Posts: 1,758
Windsor, ON, Canada
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Diplomat360 Offline OP
top fuel
Diplomat360  Offline OP
top fuel
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Joined: Jan 2003
Posts: 1,758
Windsor, ON, Canada
Final data point: I spent a little time trying to get a decent rocker arm roller to valve tip pattern print.

I am only using the checking spring (well, doubled up LOL), still, not enough pressure really to mark the tip very clearly.

Anyways, here is what I have:

1) INTAKE - about 0.050" wide

[Linked Image]

2) EXHAUST - about 0.065-75" wide

[Linked Image]

In terms of the "holy grail" chase here, that being the best valvetrain geometery: I do find that the sweep pattern is shifted towards the exhaust side.

Keeping that in mind and relying on the fact that:
- raising the rocker moves the roller toward the exhaust side of the valve stem
- lowering the rocker moves the roller toward the intake side of the valve stem

....I conclude that the B3 kit I have right now is a little too "tall" and places the rocker arm a little too high. Subsequently, this appears to be confirmed given that using a lash cap nets me higher lift, and appears to produce a better looking sweep.

Re: W2 stroker build - geometry problems me thinks... [Re: Diplomat360] #3032551
04/11/22 10:29 AM
04/11/22 10:29 AM
Joined: Sep 2014
Posts: 4,457
Washington
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madscientist Offline
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madscientist  Offline
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Joined: Sep 2014
Posts: 4,457
Washington
Originally Posted by Diplomat360
Final data point: I spent a little time trying to get a decent rocker arm roller to valve tip pattern print.

I am only using the checking spring (well, doubled up LOL), still, not enough pressure really to mark the tip very clearly.

Anyways, here is what I have:

1) INTAKE - about 0.050" wide

[Linked Image]

2) EXHAUST - about 0.065-75" wide

[Linked Image]

In terms of the "holy grail" chase here, that being the best valvetrain geometery: I do find that the sweep pattern is shifted towards the exhaust side.

Keeping that in mind and relying on the fact that:
- raising the rocker moves the roller toward the exhaust side of the valve stem
- lowering the rocker moves the roller toward the intake side of the valve stem

....I conclude that the B3 kit I have right now is a little too "tall" and places the rocker arm a little too high. Subsequently, this appears to be confirmed given that using a lash cap nets me higher lift, and appears to produce a better looking sweep.


Put the springs you run on and check it again. Using checking springs for most anything like that is a waste of time.


Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
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