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Rocker Geometry Measurements
#1524296
10/27/13 08:39 PM
10/27/13 08:39 PM
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Joined: Jul 2013
Posts: 561
USA
B3RE
OP
mopar
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OP
mopar
Joined: Jul 2013
Posts: 561
USA
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Here are the measurement and spec instructions, required for calculating correct geometry, that so many of you have requested.
1. Distance between the top of the rocker shaft and the top of the valve stem. Measure the distance between the combination square and the tip of the valve stem using a caliper, feeler gages, or other accurate measuring device. Be sure the square is resting on top of the rocker shaft and the blade is on the same angle as the valve stem. (See Photo)
2. Diameter of the rocker shaft and the roller tip of the rocker arm.
3. Rocker ratio being used.
4. Valve lift from cam card w/ 1.5 ratio rocker, or just lobe lift.
With these measurements and specs, you can contact me and I can let you know if correction is necessary, and supply you with the appropriate kit to make it perfect, guaranteed.
As always, I am happy to answer questions. I like questions.
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: Rocker Geometry Measurements
[Re: B3RE]
#1524297
10/27/13 09:22 PM
10/27/13 09:22 PM
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Joined: Jul 2010
Posts: 2,091
Delray beach, Florida
Performance Only
top fuel
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top fuel
Joined: Jul 2010
Posts: 2,091
Delray beach, Florida
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In your picture, the bottom of the spring is not centered. doesn't that skew the math?
Last edited by Performance Only; 10/27/13 09:24 PM.
machine shop owner and engine builder
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Re: Rocker Geometry Measurements
[Re: B3RE]
#1524308
10/27/13 11:26 PM
10/27/13 11:26 PM
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Joined: Oct 2003
Posts: 7,506
Az
Crizila
master
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master
Joined: Oct 2003
Posts: 7,506
Az
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Mike, How about us Magnum guys that are using rocker studs?
Fastest 300
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Re: Rocker Geometry Measurements
[Re: Mopar-Al]
#1524309
10/27/13 11:32 PM
10/27/13 11:32 PM
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Joined: Jul 2013
Posts: 561
USA
B3RE
OP
mopar
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OP
mopar
Joined: Jul 2013
Posts: 561
USA
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Quote:
As always, I am happy to answer questions. I like questions.
Even if I don't like your answers. I didn't realize you were acting as a top secret rocket scientist. I may not be able to say what I see or think, but I can see what needs to be done and do it. It's just math.
No, I'm not a rocket scientist, but I do work very hard at what I do and I do it to help myself by helping others. You're right, it is just math, so if you can see what needs done, why did you ask for the formulas? And if you knew this was about the math, why didn't you step up and tell all those members, who still thought centering the roller on the valve was correct geometry, that they were wrong? And why didn't you explain it to them so they could clearly understand why it was wrong. Hmmmmmmmm?
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: Rocker Geometry Measurements
[Re: B3RE]
#1524314
10/28/13 07:32 AM
10/28/13 07:32 AM
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Joined: Mar 2006
Posts: 9,852
MI, usa
dvw
master
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master
Joined: Mar 2006
Posts: 9,852
MI, usa
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Quote:
Quote:
After reading a fair amount about rocker geometry. I settled on the theory that the center line of the rocker arm should be at a 90 degree angle to the valve stem at mid lift. What happens is when there is more valve lift the rocker pivot in relation to the valve tip needs to be moved up. It's simple math to figure it out.
Doug
There's a little more to it than that. The valve is not on the same angle as the stand so it must be offset as well. Now how do you accomplish moving the shaft up without major surgery?
That's a good question. You can shim the shaft. That will not address the shaft center line to valve stem dimension. In my case I have individual shaft T&D. I actually offset the rocker stand mounting holes in the head. The most common solution would be to mill the stands and replace them with blocks that have the rocker shaft hole in the right spot. Can you elaborate where your theory is on rocker to stem location?
Thanks Doug
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Re: Rocker Geometry Measurements
[Re: B3RE]
#1524315
10/28/13 08:02 AM
10/28/13 08:02 AM
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Joined: Jul 2010
Posts: 2,091
Delray beach, Florida
Performance Only
top fuel
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top fuel
Joined: Jul 2010
Posts: 2,091
Delray beach, Florida
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Quote:
Quote:
In your picture, the bottom of the spring is not centered. doesn't that skew the math?
Seriously?????
From the original post: Quote:
Be sure the square is resting on top of the rocker shaft and the blade is on the same angle as the valve stem.
The picture is a reference to show how to position the square to take the measurement. The spring is an outer from a triple setup that gives a clear view of the square resting against the spring without interference from the retainer. Obviously that spring won't locate on the spring step in the head. Do you really find that troubling or do you just like trying to bust my chops? I'm trying to find ways to help Mopar guys, not tear down others.
Yes, there's a couple of things I find troubling. when you said; Quote:
Be sure the square is resting on top of the rocker shaft and the blade is on the same angle as the valve stem. (See Photo)
Clearly the square is NOT on the same angle as the valve stem. If it was, the measurement would be different. If you're not careful enough to post a picture that shows things correctly, what other shortcuts will be next?
The other troubling thing is that your post is just a thinly veiled FOR SALE add to get people to call you and buy some kit. If you really wanted to help people you'd just post your formula so people can check to see if they have a problem. If they do, maybe they'll call you. Sorry, but your whole approach looks more like a snake oil salesman tactic as opposed to someone who's really trying to help.
machine shop owner and engine builder
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