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- - Charge Motion Plates? (https://themustangsource.com/forums/f669/charge-motion-plates-404159/)

Ok, so, Charge Motion Plates...what exactlyare they? I know they're part of the intake system. What do they do?

I've seen Steeda's part number 555-3125 referred to as "Charge-Motion Plates" and also "ChargeMotion Delete Plates". Which is correct?

:dunno:

-Dan.

i believe they increase the amount of airflow in the intake path.

My understanding is that the charge motion plates have a throttle valve (just like a carborator) that partially blocks the flow of air through one of the intake valves of each cylinder at low speed (I believe it is below 3500 rpm). This causes one intake to have much higher velocity and gives better cylinder scavaging and mixture distribution at low speed, which leads to better low speed torque and fuel economy.

The down side is that the shaft is still in the intake track at high engine speed, which costs you some power on the top end. Getting rid of the valves leads to better top end power at the cost of worse low end power. Take your pick.

Interesting for all the Honda bashing that goes on in many Mustang forums, Ford has implemented what amounts to basically the same Vtec used in the Honda civic EX and same variable intake found in an acura RSX type S on this new Mustang.

Pretty cool technology.

Quote:

Originally posted by RRRoamer@March 23, 2005, 3:51 PM
My understanding is that the charge motion plates have a throttle valve (just like a carborator) that partially blocks the flow of air through one of the intake valves of each cylinder at low speed (I believe it is below 3500 rpm). This causes one intake to have much higher velocity and gives better cylinder scavaging and mixture distribution at low speed, which leads to better low speed torque and fuel economy.

The down side is that the shaft is still in the intake track at high engine speed, which costs you some power on the top end. Getting rid of the valves leads to better top end power at the cost of worse low end power. Take your pick.

Quoted post

I got the first set that Steeda released and they did a dyno pull after installing them. I picked up 6RWHP , but only 1RWTQ with them. The dyno sheet didn't show any low end torque loss and the car doesn't feel like it either. With the plates my air/fuel ratio went from about 12.0 to about 12.9 , so I am taking more air in with the plates. I think once they release the headers and I get more flow out the rear , I should see a better increase from the plates ...

Quote:

Originally posted by nynvolt@March 23, 2005, 2:22 PM
Interesting for all the Honda bashing that goes on in many Mustang forums, Ford has implemented what amounts to basically the same Vtec used in the Honda civic EX and same variable intake found in an acura RSX type S on this new Mustang.

Pretty cool technology.

Quoted post

Ford has been using this technology for quite some time. My 97 SHO had secondary intake runner controls that would open a second set of butterflies afte 3500 RPM. I know of a couple people that have just removed them. The pre-V8 SHOs has two sets of runners, one long and one short for different RPM ranges.

Ya, but back then Yamaha built the intake systems... LOL!