Thinking About Swapping Ported 6.1 Intake For 6.4

[Blue Blur 45]

Anyone weigh the 2 side by side? The 6.1 is heavy for aluminum and also heat soaks MAJOR. Been thinking trying a 6.4 intake if I can get it to work with my 92mm TB. I doubt it will out perform my 6.1 intake but wonder if it could equal it with the active runners active? If I save 20-25lbs and also make same power, WTF?

[Hemi~C~ 19]

Most in the know will tell you the ported 6.1 beats out the 6.4 intake on built motors but nothing beats track testing in my opinion. Given how cheap availability of 6.4 intakes I would say it is worth trying for yourself and your combo. Chrysler didn't pick up over 50ftlbs for on the bottom end for nothing...the intake (along with heads, vvt cam and increase in cubic incehs) was a part of that 475hp 6.4 combo.

Chris

[Blue Blur 45]

Yes and I doubt the losses would be felt. One fellow thinks the weight of the 6.4 intake is in the 7.5 lb range. My guess is the 6.1 intake is in the 20-25 lb range. Taking a 15-20lb weight reduction off the nose is also good. Heatsoak is another thing that definitely is a factor when making laps on a road course and extended street driving in 100 degree weather for hours.

[Jerseyboy 61]

I wouldn't do it. The 6.4L has distribution issues due to the angled inlet and actually becomes restrictive over 500bhp. AJ did a test back when he was at Arrington and picked up considerable power (like, 50hp at the crank on an NA stroker build) by swapping to a ported 6.1 over the 6.4 intake. the only benefit to the variable runner length is below 4700rpm, which isn't really going to help you much on a road course. The weight difference isn't going to offset the power hit imho and the heat soak becomes a non issue as vehicle speed and engine airflow goes up. You could try some of the isolator intake gaskets to help reduce heat transfer to the intake from the heads but like I said, I doubt you will notice the power difference due to heat. Personally, a good CAI that gets your air filter out of the engine bay is a better way to spend your money.

J

[Don@A2Speed 13]

Stick with the 6.1

[Speedy 247]

I wouldn't do it. The 6.4L has distribution issues due to the angled inlet and actually becomes restrictive over 500bhp. AJ did a test back when he was at Arrington and picked up considerable power (like, 50hp at the crank on an NA stroker build) by swapping to a ported 6.1 over the 6.4 intake. the only benefit to the variable runner length is below 4700rpm, which isn't really going to help you much on a road course. The weight difference isn't going to offset the power hit imho and the heat soak becomes a non issue as vehicle speed and engine airflow goes up. You could try some of the isolator intake gaskets to help reduce heat transfer to the intake from the heads but like I said, I doubt you will notice the power difference due to heat. Personally, a good CAI that gets your air filter out of the engine bay is a better way to spend your money.

J

Well put, and I remember the tests AJ did as well.

[Blue Blur 45]

I'll save my money then.

[El Diablo 72]

I wouldn't do it. The 6.4L has distribution issues due to the angled inlet and actually becomes restrictive over 500bhp. AJ did a test back when he was at Arrington and picked up considerable power (like, 50hp at the crank on an NA stroker build) by swapping to a ported 6.1 over the 6.4 intake. the only benefit to the variable runner length is below 4700rpm, which isn't really going to help you much on a road course. The weight difference isn't going to offset the power hit imho and the heat soak becomes a non issue as vehicle speed and engine airflow goes up. You could try some of the isolator intake gaskets to help reduce heat transfer to the intake from the heads but like I said, I doubt you will notice the power difference due to heat. Personally, a good CAI that gets your air filter out of the engine bay is a better way to spend your money.

J

I remember him doing that testing also, couldn't remember exactly what the results were but I was thinking the 6.1 ported worked better.

Isn't there one cylinder on the 6.4 that historically ended up running leaner and causing issues ?

[us1champ 22]

kenny

i could be wrong but i was thinking it was one bank of cylinders that was running leaner than the other side.. i could be wrong though

[TNCHARGER 23]

AJ suggested I install a 6.1 intake on my 6.4 based 426...picked up 26RWHP....The lean condition was an issue with FI cars but the NA 6.4s with the 6.1 still out perform the plastic 6.4 intake..

[us1champ 22]

Just curious is it due to longer intake runners I wonder?

Sent from my iPhone using Tapatalk

[Blue Blur 45]

Curved inlet makes sense. Sounds like if there is a lean condition, some ports are getting an abundance of air or others are to starved. Not something im gonna try to tune out with what I have. Fuck that.