aknovaman

iTrader: (7)

Kind of off track at the end but I will re-do the vid to make it clearer, later. The cam is laying in a piece of galvanized track used to hang light fixtures I had laying around. Actual duration in degrees is calculated starting at zero lift. Rotate cam to 0.050 lift and Zero the protractor degree readout. Continue rotating in same direction till indicator is a bottom of lobe at 0.050 lift and read the delta in degrees. Thats your duration at 0.050 as advertized on cam card.

Michael Yount

iTrader: (1)

Might want to change title to cheapest way to measure duration or valve events. I think the cheapest way to measure lift is with a digital caliper.

aknovaman

iTrader: (7)

Yes, sort of. The point is to show how to measure lift and lead into other can measurements on the cheap. I have measured gross lift from bottom of lobe to top of lobe then subtracting base circle which I believe is fine. I plan to re-do the vid and measure lift, duration at 0.050 and then LSA between intake and exhaust lobes. Its a crappy vid i made in a hurry but a conversation starter. it was the easiest way for me to explain it to a buddy, not at my location. Plus I had a pile of used cams i wanted to sell and i had no idea of their specs.

G Atsma

The title is actually accurate. The first part does show how to measure lift.
THEN he goes to show us how to measure duration at .050", the accepted duration measurement "standard".
He just got ahead of himself in the text of the post when going to describe duration measurement.
I'm impressed at the simplicity and cleverness of this DIY "Cam Doctor". The days of unknown mystery cams laying around are numbered!

aknovaman

iTrader: (7)

it's all part of being cheap and lazy. I could have taken it to work and measured it using our $8k Mahr CX1 but who would be able to replicate that process? also my tread depth micrometer cost less than 1/3 the price of a harbor freight caliper..

G Atsma

Kudos to ya man! You showed us how to do this easily and decently accurately, in away that anyone can duplicate themselves with easily found parts and supplies.
But not just that, it removed some of the mystery some of us might have thought existed in this process.