Cam selection vs Velocity and Flow.
Below is the flow report for asked for. The numbers after the flow number reported at the various lifts is the amount of swirl. While I’m not very knowledgeable on this, I asked and was given the reply that at .600 lift the numbers started to climb but in the head porters testing, he still considered it good and flowing quietly. At .700, the port made a racket and flow took a dip.
His advice was to keep the lift in the .600 area and not much more. While he didn’t write the numbers down to the exact point or say the exact point, he did say it’ll take another .030-.040 no problem. I was the higher 600’s where it started to get noisy. I know that’s gauge but it wasn’t really super important to me and I didn’t ask for lift tests for every .050.
I would not have a problem & would feel just fine running a .600+ lift cam with these flow reports. As you can see the exhaust never quit all the way to .700.
These are my W5’s I plan to end up running a MP tunnel ram on with an Ultradyne NF lobe solid cam with .640 lift, then minus lash of course.
Some will say there’s more power in lifting the valve more. I’m OK starting here. I’ll also be starting with a 4bbl. (1 step at a time folks.)
Below is the flow report for asked for. The numbers after the flow number reported at the various lifts is the amount of swirl. While I’m not very knowledgeable on this, I asked and was given the reply that at .600 lift the numbers started to climb but in the head porters testing, he still considered it good and flowing quietly. At .700, the port made a racket and flow took a dip.
His advice was to keep the lift in the .600 area and not much more. While he didn’t write the numbers down to the exact point or say the exact point, he did say it’ll take another .030-.040 no problem. I was the higher 600’s where it started to get noisy. I know that’s gauge but it wasn’t really super important to me and I didn’t ask for lift tests for every .050.
I would not have a problem & would feel just fine running a .600+ lift cam with these flow reports. As you can see the exhaust never quit all the way to .700.
These are my W5’s I plan to end up running a MP tunnel ram on with an Ultradyne NF lobe solid cam with .640 lift, then minus lash of course.
Some will say there’s more power in lifting the valve more. I’m OK starting here. I’ll also be starting with a 4bbl. (1 step at a time folks.)
