cam duration question opening ramps
Turbo Mini Forums

Hiya

does anybody have some cam figures handy

I need it for simulation input
type of cam not really important.. something in the 266 to 280 region would do fine
the normal : in /ex opens & closes in degrees.

but here it gets tricky
Opening ramp duration
Closing ramp duration
Dwell in degrees


cheers

That sir, is not rust, it is the progressive mass reduction system

http://aseriesmodifications.wordpress.com/

You wont find that data for an A Series cam anywhere.

Here's a plot of the ramps on some factory cams:



Dwell is normally negligable, but its significance depends on the polynomial used by the software.

Also, don't use the stated duration verbatim. From my measurements the 255, 266 & 276 type numbers are nowhere near the actual off-seat values. Some are higher and some are lower, so it's not as if they use a consistant lift value.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

thanx ( a little late) I figured it out .. sort of. I'd better make a ,measurement rig or find someone with a proper cam measurement set up to do it for me.

Edited by Sir Yun on 8th Nov, 2012.

That sir, is not rust, it is the progressive mass reduction system

http://aseriesmodifications.wordpress.com/