Cam Lift

[nivvy]

Whit is the formula for equating 1.6 rocker lift? I went blank....

Like .528 equals .561 but cant remember formula...thx


8 Pack

[70challengerrt]

Isn't just multipling cam lift by 1.6 and that is total valve lift?

[nivvy]

I meant using exa.    .528 lift using 1.6 rockers what is the toal cam lift ...what is formula

8 Pack

[Killer_Mopar]

Divide your lift by 1.5 and multiply it by 1.6.....simple as that. For instance, if it was 500 then you would use this forumula (500/1.5) x 1.6

[70challengerrt]

Sorry i misunderstood Killer mopar got it right.

[falcon50flier]

Not sure what this was about when your post said "using exa." If you have a cam with rated lift at 1.5:1 ratio, and want to see what you pick up by switching to 1.6:1, then the above formula is the one. Be very careful interpreting cam specs quoting lift, and if possible get a grind sheet showing base circle and lobe lift directly (no ratio implied). Then multiply by your 1.6 to get valve lift.

[zerfetzen]

I wonder where the math comes from, because it looks suspect.  Why say (Lift / 1.5 * 1.6), when (Lift * 1.067) gets you to the same place?  That's like saying 10 = 10 / 10 * 10.  If that came out of a mechanical book, I'd shop for a different book, regardless of whether or not the end result is right.  Just my 2 cents.

[Killer_Mopar]

use this forumula (500/1.5) x 1.6

Note the parenthesis 500 / 1.5 x 1.6 is not the same as (500/1.5) x 1.6...you're soppose to go in this order; parenthesis, exponents, multiplication, division, addition, subtraction......If you want the equation another way then use [(500 x 1.6) / 1.5]

[zerfetzen]

Multiplication and division are the same in order of operations, so:

(A / B) * C = D

A / B * C = D

A / (B * C) = D

are all equivalent.

But to answer my own question (I really shouldn't have read this thread late last night when I was tired), you can't very well multiply Cam Lift by 1.066667 or whatnot if you're going to vary 1.6 (such as comparing different rocker lifts), which might be the case.  Cheers.

[Killer_Mopar]

Multiplication and division are the same in order of operations, so:

(A / B) * C = D

A / B * C = D

A / (B * C) = D

are all equivalent.

Those equations are not all equivalent, like I said before you do whatever is in the parenthesis first. Use your equations for example and replace your variables with these numbers
A = 10
B = 2
C = 5
D is dependant on the parenthesis

(10 / 2) x 5 = 25
10 / (2 x 5) = 1

[zerfetzen]

You're right Killer Mopar, sorry for the goof.  I really should know better.  Uh, damn it got quiet...moving on folks, moving on...