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I drew a picture showing why rocker arm geometry is important. Hopefully, this can help someone that dosen't understand the concept of it.

http://www.thesamba.com/vw/gallery/pix/144844.jpg

Steve

Well I don't know about anyone else, but I've never understood it exactly until I looked at your pic. Thats great information to the novice engine builder(such as myself).

Thanks,
Andy

There's more to it than that, but the goal will make that true yes.

The goal is to make sure that you do not have excessive side loading on the valve stem, and to make sure you minimize non-linear motion characteristics, which will change the form of the valve events. Include some information on the loading components for non-roller rockers, and you'll pretty much explain it all.

Great drawing, by the way.

Thanks for the Kudos.

I've never actually set rocker geometry, but I'm about to in the next couple months. At that time, I'll take some pictures and try to come up with a set of "directions" so to speak.

I've learned soo much from this forum and I really want to give something back. Since there's not a lot published on rocker geometry, I figured I'd try and do that (but not before doing it myself).

Steve

Thanks for the picture. How do you set up proper rocker arm geometry?

Leatherneck wrote:Thanks for the picture. How do you set up proper rocker arm geometry?

Very carefully Leatherneck. Watch my new post in here.

This one's a couple years old ... Mark went through a lengthy process on this (thought you put this on your website Mark) ... big ole thread. Lots of interesting info there.

http://www.shoptalkforums.com/viewtopic.php?t=79451

Another great post. This forum is coming back to life!!!
Tim

Dave, I am working on a refined version of it, which will eliminate all the BS that was in that thread. Something more like an article. This thread stands as it is, and doesn't need to be repeated, but I have a copy in case this place tanks.

500LbGorilla wrote:Dave, I am working on a refined version of it, which will eliminate all the BS that was in that thread. Something more like an article. This thread stands as it is, and doesn't need to be repeated, but I have a copy in case this place tanks.

I clicked the link to go to it meaning the drawing it was too big so I added it to photo bucket and reposted it. I hope you didn't mind.

It's not my picture.. I was talking to fortyeye. His name is Dave. I'm sure the original poster is not concerned about it either.

All the coolest guys are named Dave ... or Mark ... or Guido ... or Delmar

I drew the picture and I'm cool with you posting it up. I never got a chance to do the article I had planned, but if you need any pictures, Mark, let me know. Jake did a big write up on his site, but I haven't had a chance to read it yet.

Steve

Yeah, Jake's approach is totally different. You'll see when you read it. You and I approach it from a physics standpoint. He approaches it from a measurements standpoint from what I can tell.