CMCV question

[CEHollier]

I came across this article on intake manifolds. They noted the CMCV was not functional on the GT350 manifold they tested. My question is what impact if any would having it have made on this test? Does it affect torque/hp etc?
http://www.fordmuscle.com/tech-stor...old-shootout-gt-gt350-boss-302-and-cobra-jet/

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[MaskedRacerX]

Funny, I just read the same article last night!

Anyway, they seem to be saying it had CMCV, they just weren't tuned or properly hooked up (maybe due to the engine being run standalone) - from the article:

The newest manifold to the OEM manifold market comes from the GT350. Ford revisited the Intake Manifold Runner Control (IMRC), also called Charge Motion Control Plates, feature that manipulates the intake’s runner velocity. If you could build a manifold that took the best of a short and long runner design, this is basically what Ford was trying to accomplish

and

The BOSS 302 versus GT350 graph is the most interesting to look at as it seems like these manifolds are going blow for blow to create more power. In the end, the GT350 edges out the BOSS by 5.4 horsepower and 3.2 lb-ft of torque, though the GT350 makes it 700 rpm higher than the rest of the intakes at 6,100 rpm. This manifold comes in second place in the horsepower but third in torque. With working motion control valves, it would probably be a lot closer to the GT manifold.

I think you're right on, as a higher flowing manifold, it really shines up top, but with the CMCV properly tuned, it doesn't sacrifice as much (anything[?]) on the lower and mid range.

 

[CEHollier]

Came across this on another site. - The STOCK plates are a marketing snafu on Ford's part. While other manufactures proudly advertise such tech in their motors (Infinity, Acura, etc) Ford really was clueless. The engineers put them in there for a reason, two actually.

1) They improve fuel econ marginally

2) They improve bottom end torque allowing for a more linear torque curve.

It's actually a nifty piece of tech. It allows the engine to deliver a more linear power curve and save you some gas.

Now for the downside....

For drag racers and people who generally care about WoT only type of running they can be a bad thing. Mainly because they do obstruct airflow. And as we all know, us muscle car guys go crazy over air flow. We'd port and polish our own a$$ holes if we new it would make our cars go faster.

So get them if you are all about making max power on the dyno and getting all you can get for that last leg at the drag strip.

Don't get them if you want a more linear responsive motor for daily driving around town. They will actually give you a better feeling and performing car for city driving. Your car will always feel like it's pulling hard from and stand still on up through the gears...in city driving conditions.

 

[CEHollier]

Funny, I just read the same article last night!

Anyway, they seem to be saying it had CMCV, they just weren't tuned or properly hooked up (maybe due to the engine being run standalone) - from the article:




and




I think you're right on, as a higher flowing manifold, it really shines up top, but with the CMCV properly tuned, it doesn't sacrifice as much (anything[?]) on the lower and mid range.

I think this sums things up pretty good. "We would consider these manifolds to be nearly identical with a slight edge to the GT350. We wish we could have seen what the operational Charge Motion Control Valves would have played into the mix."

 

[GTBOB]

The stand alone engine controller they used during their testing did not have the capability of controlling the intake runner's movement. I'm not sure if they kept them closed or wired open during their testing so gains in either tq or top end hp might not be seen.

The moveable part of the intake runners completely unshroud the intake track at WOT so there is no restrictions. In theory, the motor might gain a little bit of low rpm tq with them working properly. But looking at my logs while running the GT350 manifold, the runners are completely open by 2k rpm....well below operating rpm at the strip. *Hint Hint* one of the key ingredients to prevent surging while using a GT350 TB during normal driving;)

 

[WildHorse]

My favorite line from the article:

"Simply put, the GT manifold absolutely murders the BOSS manifold all the way up to 6,600 rpm."

Also, the CMCV were not in their tests. Utilizing the CMCV in the GT350 intake, that's a killer setup IMO.

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