2018 manifold runner length

[K4fxd]

What I find on the internet is it has 16.1 inch long runners. Is this true?

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[Cory S]

It's got to be true......LOL.....

I found 16.1" to be mentioned as well

 

[Proshop]

16.141
https://www.google.com/amp/s/www.mo...rd-coyote-intake-manifold-on-gen-3-crate/amp/

 

[80FoxCoupe]

What I find on the internet is it has 16.1 inch long runners. Is this true?

What are you planning?

 

[K4fxd]

What are you planning?

The math says this runner length will fall on its face after 6000 RPM.

I'm bored and am building a sheet manifold.

 

[Dapepper9]

The math says this runner length will fall on its face after 6000 RPM.

I'm bored and am building a sheet manifold.

Does that take into account cubes and cam timing or runner volume? GT350 manifold goes to like 8000 with very similarly lengthed but larger cross section runners

 

[K4fxd]

GT350 manifold goes to like 8000 with very similarly lengthed but larger cross section runners

This is the reason for my question. I guess I'll have to measure them next time the GT350 manifold is off the car.

The math is pulse wave, or ram or whatever you want to call it. A 12 inch runner is better suited at least that is what the math says.

The math is a text book and we live in the real world so it may very well be 16 inches.

 

[Dapepper9]

This is the reason for my question. I guess I'll have to measure them next time the GT350 manifold is off the car.

The math is pulse wave, or ram or whatever you want to call it. A 12 inch runner is better suited at least that is what the math says.

The math is a text book and we live in the real world so it may very well be 16 inches.

If I remember correctly 16.1xx" is right but the 18 has a smaller bellmouth inlet than the gt350 as well as mildly different outlet size and plenum volume and the 7ish mm of tb opening diameter. In comparison, Boss and CJ have around 9.5" runners that are nearly straight and have similar peaks to the GT350.

What kind of RPM are you looking to turn?

 

[K4fxd]

What kind of RPM are you looking to turn?

Shift at 74 to 7600

 

[K4fxd]

Whenever I model the GT350 or the 18 it drops power like a stone after 6500. When I model the CJ it looks like a real dyno graph.

Just a head scratcher and curiosity. Yes I know that killed the cat.

 

[Dapepper9]

In that case, why not just run the 18? It's powerband peaks at 7400, shifting at 7600 will keep you pretty well in the meat. Or if you're set on custom manifold, could basically copy the Edelbrock Victor, it has a nearly identical powerband to the 18. In fact, they both ran identical dragy times for me.

 

[K4fxd]

In that case, why not just run the 18?

I've already got a 350 manifold.

I was going to copy the CJ with a round TB opening but I'll look at the E.

Mostly doing it to have a project over the winter.

 

[Dapepper9]

I've already got a 350 manifold.

I was going to copy the CJ with a round TB opening but I'll look at the E.

Mostly doing it to have a project over the winter.

I can try to measure the runners in mine after work if you need. If I can remember to I'll update this thread with the results. Won't be able to get a plenum volume measurement but I can tell you it's greater than a Boss by a fair amount

 

[K4fxd]

I can try to measure the runners in mine after work if you need.

Thanks that would be helpful.

 

[80FoxCoupe]

The math says this runner length will fall on its face after 6000 RPM.

I'm bored and am building a sheet manifold.

Your math says a 2018 mustang intake will fall on its face at 6000rpm?

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