Ironhead Shovster build take2

[Steve9]

Good catch Ric...lol

[Maxeffort]

I haven’t kept up,with the last round of posts on this thread.

This link may have been mentioned. I’m sharing the link and the photos because there is a discussion of the roller vs pad or “shoe”

http://www.crankshaftcoalition.com/w...Y_MID_LIFT.pdf

[Maxeffort]

Regardless of the math, I’ve worked with these situations successfully on modified vintage builds of various shaft rocker engines.

I get the valve side as good as it can be, then worry about the pushrod.

It may or may not be mid lift rocker as discussed, but that’s a reference point. The pattern on the valve tip and the measurement of lift will help you get there.

I always blue the valve tip. The pattern doesn’t need to be perfectly centered, but it needs to be on the valve and not running off. Narrower is generally better than wide.

[kitabel]

The HS roller error he describes as if it were in some way a new idea.
Roller tappets had been in use in industry for over 100 years when HS made those.
My grandmother's Chambart treadle-powered sewing machine, made in the 19th century, used a roller tappet to wind the bobbin.