340 dyno chart thoughts
I believe I understand all of what's being said, so perhaps to make this easier on the OP, riddle me this;
Let's say a guy needed an HFT of around 230/237/110cam (.050). Installed at 108, this makes the .050 intake events look like this; opens at 7 before and closes at 43 after. The advertised SAE @.006 might be 276/284. Since we know that flows below .050 are minimal we don't much care about them. However, these specs are useful to determine Dcr and idle quality. So again in at 108 the SAE intake events now are 30before and 66after. The 66 after can be plugged into a Dcr calculator and the result can indicate a lil something about how the engine will idle and how it will behave at low revs. The exhaust side events are open at 74,closed at 30.
So to recap,
the .050s numbers are;
int;opens at 7*before closes at 43*after for total 230*
Exh;open at 50.5* before,closes at 6.5* after for 237*
and overlap of 7+6.5=13.5*
The SAE numbers are;
intake opens 30before,closes 66after,for total 276*
exh opens 74before,closes 30after,for total of 284*
and overlap of 30+30=60*
What this shows us about the intake lobe, is that from SAE to .050 is a difference of 276-230=46degrees and 23 of 'em are on either end. That means the ramps are climbing; (.050 less .006) =.044 in 23 degrees or .044/23=.001913inch per degree,average.
Now let's say you want that same cam size, cuz the engine needs it, in actual valve event specs, but you don't want the 66* of ICA that comes with the HFT. So the thought of using a SFT enters your head, on account of their faster ramps.
This is where the confusion comes in.Because of the two different ways these cams are rated, it is impossible to directly relate them.
So now what's a guy to do? You gotta call somebody, and it better be somebody who has actually done it and has measured it, or the guy that builds cams, or the guy who builds engines and knows this stuff.
Am I wrong?