Cam drive HP
Cam drive HP
(OP)
Could someone help me with a formula for calculating the HP required to turn a specific cam considering valve spring rates. College physics is too far behind me to ferret it out on my own.
I want to get a reasonably useful number to select a drive belt or chain for a six cylinder engine.
I can see accleration and impulse should be part of the equation but those components may be so small as to not be a factor? Any thoughts welcomed.
Steve
I want to get a reasonably useful number to select a drive belt or chain for a six cylinder engine.
I can see accleration and impulse should be part of the equation but those components may be so small as to not be a factor? Any thoughts welcomed.
Steve





RE: Cam drive HP
RE: Cam drive HP
Cheers
Greg Locock
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.
RE: Cam drive HP
RE: Cam drive HP
1) doing a single-line kinematic calculation for one exhaust and one intake cam lobe at a particular rpm, then
2) calculating the (phased) sum of the forces due to all lobes.
RE: Cam drive HP
This argument came up again when I asked why we use heavy duplex chains in our racing Triumphs as opposed to the lighter simplex chains and all the answers boiled down to insurance. All of the input was subjective and anecdotal (and SCARY) but very little genuine data. What forces do we actually see withn 150# seat pressures. Lord knows it's less than the average weekend drag racer is looking at.
And as an aside, the folks at Jesel were somewhat less than interested in discussing a one off application. Can't blame them for that...
Again, Thanx for the input, Steve
RE: Cam drive HP
http://www.designofmachinery.com/CDH/index.html