CLASS RACER FORUM - View Single Post - Issue with Stamped Steel Rockers in BB Chevy

Jeff Goss · 06-03-2008, 08:50 PM

Isn't that a function of duration? They way I understand it, you want the valve to open and shut as quickly as possible. Ideally, you would want the cam "ramp" to increase as steep as possible, then drop as quickly on the back side. This could cause the inherent "bounce" starting at the lifter and reverbrating through the valvetrain. If the spring couldn't keep up, you would get periods of increased lash as the valve tried to keep up. These harmonics cause the "beating" of the valvetrain.

I'm not the smartest tool in the shed, but it seems like when we started to vary duration in Stock, these problems started. I know Chevrolet motors aren't the only ones affected.

Jeff

06-03-2008, 08:50 PM	#8
Jeff Goss Member Join Date: Nov 2001 Location: Burlington, WA Posts: 361 Likes: 1 Liked 0 Times in 0 Posts	Re: Issue with Stamped Steel Rockers in BB Chevy Isn't that a function of duration? They way I understand it, you want the valve to open and shut as quickly as possible. Ideally, you would want the cam "ramp" to increase as steep as possible, then drop as quickly on the back side. This could cause the inherent "bounce" starting at the lifter and reverbrating through the valvetrain. If the spring couldn't keep up, you would get periods of increased lash as the valve tried to keep up. These harmonics cause the "beating" of the valvetrain. I'm not the smartest tool in the shed, but it seems like when we started to vary duration in Stock, these problems started. I know Chevrolet motors aren't the only ones affected. Jeff