EQ Heads and stock rocker arms?
From post #9
Do you see that number 37* that you entered on the line called "Inlet valve closes"? That is the .050 number, and Wallace is asking for the advertised number. That number 37 will not work for calculating DCR.
Since Hughes doesn't publish the advertised number we have to fudge it.
Let's see how this cam might work out;
You see where you got that 37* from?Down there, just under where it says Cam Timing @.050 Tappet lift? That is where you got your 37* number. Unfortunately compression does not begin at that number cuz the valve is open by the tappet lift times the rocker ratio, Which on Magnums is 1.6. So the valve is .050x1.6=.080 open! So no, the .050 numbers cannot be used.
So lets estimate the Intake Closing Angle,from the only info we can go on; the archives.
OH no, they didn't even publish it there!. See, this is what I have against Hughes; a failure to disclose this stuff.
Ok so we are gonna have to fudge it.
I chose 37* as a fast-rate of lift for a hydraulic roller cam. It might not be 100% accurate, but it will be close. So let's add 37* to the published intake duration and see how it goes.
So 37 plus 222 intake duration=261, and I like to work with even numbers so I will arbitrarily round that up to 262*. And the Installed will remain at 106*..
Doing all the math I get an ICA of 57*. That is the number you need to enter where you previously entered 37.
And I hunted around and found 9.2 as fairly common Scr for 5.9s,so why not hope for the best; namely 9.2 Scr.
When I enter the new numbers into the Wallace, I get Dcr 7.7@152psi@300ft. It is my opinion that this will be reasonably accurate.
Here's the deal on that!
152 is pretty good!
Let's compare it to the stock cam. I hunted around some and this is what I found; 250/264/110 in at 119! This cam has an ICA of 64* and an LSA of 110. Plugging those into the Wallace, I get; Dcr of 7.43@143 psi
I estimate the Hughes to be 261/267/110,in at 106
So you are about 1.5 cam sizes bigger; a size being about 7*
As you can see;you will be making more power than the stocker, everywhere!
And the boost in low speed torque 152 psi versus 143 will be noticeable
At a Dcr of 7.7, you may be able to run 87 gas; I think so.
From post #9
Do you see that number 37* that you entered on the line called "Inlet valve closes"? That is the .050 number, and Wallace is asking for the advertised number. That number 37 will not work for calculating DCR.
Since Hughes doesn't publish the advertised number we have to fudge it.
Let's see how this cam might work out;
You see where you got that 37* from?Down there, just under where it says Cam Timing @.050 Tappet lift? That is where you got your 37* number. Unfortunately compression does not begin at that number cuz the valve is open by the tappet lift times the rocker ratio, Which on Magnums is 1.6. So the valve is .050x1.6=.080 open! So no, the .050 numbers cannot be used.
So lets estimate the Intake Closing Angle,from the only info we can go on; the archives.
OH no, they didn't even publish it there!. See, this is what I have against Hughes; a failure to disclose this stuff.
Ok so we are gonna have to fudge it.
I chose 37* as a fast-rate of lift for a hydraulic roller cam. It might not be 100% accurate, but it will be close. So let's add 37* to the published intake duration and see how it goes.
So 37 plus 222 intake duration=261, and I like to work with even numbers so I will arbitrarily round that up to 262*. And the Installed will remain at 106*..
Doing all the math I get an ICA of 57*. That is the number you need to enter where you previously entered 37.
And I hunted around and found 9.2 as fairly common Scr for 5.9s,so why not hope for the best; namely 9.2 Scr.
When I enter the new numbers into the Wallace, I get Dcr 7.7@152psi@300ft. It is my opinion that this will be reasonably accurate.
Here's the deal on that!
152 is pretty good!
Let's compare it to the stock cam. I hunted around some and this is what I found; 250/264/110 in at 119! This cam has an ICA of 64* and an LSA of 110. Plugging those into the Wallace, I get; Dcr of 7.43@143 psi
I estimate the Hughes to be 261/267/110,in at 106
So you are about 1.5 cam sizes bigger; a size being about 7*
As you can see;you will be making more power than the stocker, everywhere!
And the boost in low speed torque 152 psi versus 143 will be noticeable
At a Dcr of 7.7, you may be able to run 87 gas; I think so.
