I was wondering how these work. Can someone tell me what they do? Thanks!

 

"At the end of each intake runner was a new-to-Mustang feature Ford called a charge motion control valve. At low engine speeds and light loads, these specially shaped control flaps closed to speed the intake charge and induce a tumble effect in the combustion chamber. That caused the fuel to mix more thoroughly and burn more quickly and efficiently. At higher engine speeds, the charge motion control valves opened fully for maximum flow into the combustion chambers."

the delte plates get rid of the butterfly valves allowing them to be wide open all the time

 

The charge motion valves are a unique design by Ford... The 3valve is a great engine because the airflow from intake, through the engine, and out the exhaust port is very fast. There are very few curves. This high-flow is great, but with one catch... it kills torque. This was a problem on previous mustangs.

So Ford installed closure plates right above the cylinders which slow down air and disrupts air before it enters the cylinders. This increases torque a lot, and is the answer to making such a powerful engine out of such a small block. But when torque starts to take a backseat to RPM at higher speeds and higher RPMs, those closure plates start hurting airflow, and the car will be lacking in power and not have any power on the high-end. So Ford's design has a motor built onto it, and those closure plates will open up at higher RPMs in order to squeeze out as much horsepower as possible.

So the idea of getting rid of these cool closure plates came about when people realized that even when the plates are open at high RPMs they still don't fully open, so the car is still being limited. So Steeda invented charge-motion DELETE plates, which are replacement plates that do not have the closure plates/valve/doors inside them. They're empty. Air can flow freely into the cylinders.

The problem is that without a good person writing your tune for the plates, you can end up losing torque, since you uninstalled Ford's main component in letting this small block achieve torque. So you need a good tuner to make these plates work correctly, and also to turn off the sensor for the plate's motor, since the motor is uninstalled with the delete plates, and we don't want a check engine light.

I personally doubt delete plates and a tune, because I dont see how a computer tune can make up for the fact that the air disruption needed for torque is gone. But, I do have them installed, and I don't regret them, so I really can't lean one way or another.

Yeah...

 

Thanks for the info.... Anyone have any before/after dyno sheets for this part?

 

Search around, you'll find some... I believe 10-15HP, not sure about torque. But brenspeed.com, one of the most trusted mustang shops, says in their product info "Alot of customers feel low-end power is important to them, if youre one of them then these plates might not be for you."

yeah... like I said, I dont regret them, wish I had access to a dyno before and after.

 

Just another quick question.... Are the charge motion control valves basically acting as another throttle?

 

Anyone?

 

Unfortunately, this part of your explanation is wrong The concept/purpose of variable intake tract volume is toINCREASE speed/velocity. This aids in cylinder filling at low speeds.

Also, it is by no means "unique" to Ford. BMW, Yamaha,Hondaand others have used it.

 

No they do not open/close in sync with the TB.

I talked to Lidio at Alternative Auto about delete plates and he said they're worth about 5-7hp. He didn't think they were worth it. You WILL lose a little fuel economy and low end torque. The only reason why I got mine was because I got a set of the billet plates for $90. If you're installing a Procharger/Vortec or any other Centrifigal supercharger then they're almost a must. But all other roots/twin screw blowers will replace the whole intake manifold so you don't need to worry about them.