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FE Technical Forum / Edelbrock intake differences
« on: August 16, 2022, 02:36:53 PM »
Anyone tell me the physical differences between the Performer 390 and the Performer RPM ? They look like they have the same basic shape but the 390 has smaller tunnels and ports?
Everywhere I read and everyone I talk with says the RPM gives better performance at higher rpm and gives up nothing at lower rpm. But I'm guessing few have really analyzed the differences in performance in the 2000 to 3000 rpm ranges. And very few would have a reason to analyze the differences in the 2000 to 3000 range unless you're working the motor hard in that rpm range (like when towing). Would the smaller tunnels of the 390 give better turbulence and thus better mpg and better power in the 2000 to 3000 rpm range?
In my F250, I have a relatively tame 482 in front of a NP435 tranny and gear vendor. Rear end is 410. Adding the gear vendor got me no noticeable improvement in mpg. My guess is my particular build is more efficient around 2900 rpm (where I used to cruise on the freeway) than it is at 2200 rpm (where I freeway cruise with the gear vendor). Perhaps the lower rpm results in less turbulence and a "lazier" air:fuel mix with my current RPM intake. In theory, the smaller tubes in the 390 intake would make for a better air:fuel mix at low rpm? BTW, my engine hits peak torque at 3700 rpm.
Everywhere I read and everyone I talk with says the RPM gives better performance at higher rpm and gives up nothing at lower rpm. But I'm guessing few have really analyzed the differences in performance in the 2000 to 3000 rpm ranges. And very few would have a reason to analyze the differences in the 2000 to 3000 range unless you're working the motor hard in that rpm range (like when towing). Would the smaller tunnels of the 390 give better turbulence and thus better mpg and better power in the 2000 to 3000 rpm range?
In my F250, I have a relatively tame 482 in front of a NP435 tranny and gear vendor. Rear end is 410. Adding the gear vendor got me no noticeable improvement in mpg. My guess is my particular build is more efficient around 2900 rpm (where I used to cruise on the freeway) than it is at 2200 rpm (where I freeway cruise with the gear vendor). Perhaps the lower rpm results in less turbulence and a "lazier" air:fuel mix with my current RPM intake. In theory, the smaller tubes in the 390 intake would make for a better air:fuel mix at low rpm? BTW, my engine hits peak torque at 3700 rpm.