What is a CMCV Delete?
#11
RE: What is a CMCV Delete?
Charge Motion Control Valves improve low-speed combustion
The air-fuel mixture entering an engine behaves differently at different engine speeds and loads. At low engine speeds and light loads, relatively little air-fuel mixture is drawn into the cylinders in a given time period, so it moves relatively slowly through the intake runners and into the cylinders. At high engine speeds, the intake mixture speeds up, as a larger volume passes through the intake runners over the same time period.
One of the challenges involved in squeezing the utmost efficiency out of each drop of fuel is to assure that it mixes thoroughly with air, in the right ratio, before it is burned in the cylinders. This is easiest when the air is moving quickly.
At lower speeds and lighter loads, the new three-valve engine uses an electronically controlled metal flap at the end of each intake runner – eight in all. This Charge Motion Control Valve was specially shaped, through CAD modeling and testing, to speed up the intake charge and induce a tumble effect in the combustion cylinder. This causes the fuel to mix more thoroughly, and to burn quickly and efficiently, with reduced emissions, particularly at idle.
The CMCVs are controlled by an electronic motor, and open at a predetermined point as engine speed increases. At higher RPM, they do not affect the intake charge at all. This allows undisturbed maximum flow into the combustion chambers at wide-open throttle. The CMCV motor is sound insulated, so its operation remains transparent to vehicle occupants.
The air-fuel mixture entering an engine behaves differently at different engine speeds and loads. At low engine speeds and light loads, relatively little air-fuel mixture is drawn into the cylinders in a given time period, so it moves relatively slowly through the intake runners and into the cylinders. At high engine speeds, the intake mixture speeds up, as a larger volume passes through the intake runners over the same time period.
One of the challenges involved in squeezing the utmost efficiency out of each drop of fuel is to assure that it mixes thoroughly with air, in the right ratio, before it is burned in the cylinders. This is easiest when the air is moving quickly.
At lower speeds and lighter loads, the new three-valve engine uses an electronically controlled metal flap at the end of each intake runner – eight in all. This Charge Motion Control Valve was specially shaped, through CAD modeling and testing, to speed up the intake charge and induce a tumble effect in the combustion cylinder. This causes the fuel to mix more thoroughly, and to burn quickly and efficiently, with reduced emissions, particularly at idle.
The CMCVs are controlled by an electronic motor, and open at a predetermined point as engine speed increases. At higher RPM, they do not affect the intake charge at all. This allows undisturbed maximum flow into the combustion chambers at wide-open throttle. The CMCV motor is sound insulated, so its operation remains transparent to vehicle occupants.
And now you know the rest of the story....
#13
RE: What is a CMCV Delete?
ORIGINAL: LBJay
And now you know the rest of the story....
Charge Motion Control Valves improve low-speed combustion
The air-fuel mixture entering an engine behaves differently at different engine speeds and loads. At low engine speeds and light loads, relatively little air-fuel mixture is drawn into the cylinders in a given time period, so it moves relatively slowly through the intake runners and into the cylinders. At high engine speeds, the intake mixture speeds up, as a larger volume passes through the intake runners over the same time period.
One of the challenges involved in squeezing the utmost efficiency out of each drop of fuel is to assure that it mixes thoroughly with air, in the right ratio, before it is burned in the cylinders. This is easiest when the air is moving quickly.
At lower speeds and lighter loads, the new three-valve engine uses an electronically controlled metal flap at the end of each intake runner – eight in all. This Charge Motion Control Valve was specially shaped, through CAD modeling and testing, to speed up the intake charge and induce a tumble effect in the combustion cylinder. This causes the fuel to mix more thoroughly, and to burn quickly and efficiently, with reduced emissions, particularly at idle.
The CMCVs are controlled by an electronic motor, and open at a predetermined point as engine speed increases. At higher RPM, they do not affect the intake charge at all. This allows undisturbed maximum flow into the combustion chambers at wide-open throttle. The CMCV motor is sound insulated, so its operation remains transparent to vehicle occupants.
The air-fuel mixture entering an engine behaves differently at different engine speeds and loads. At low engine speeds and light loads, relatively little air-fuel mixture is drawn into the cylinders in a given time period, so it moves relatively slowly through the intake runners and into the cylinders. At high engine speeds, the intake mixture speeds up, as a larger volume passes through the intake runners over the same time period.
One of the challenges involved in squeezing the utmost efficiency out of each drop of fuel is to assure that it mixes thoroughly with air, in the right ratio, before it is burned in the cylinders. This is easiest when the air is moving quickly.
At lower speeds and lighter loads, the new three-valve engine uses an electronically controlled metal flap at the end of each intake runner – eight in all. This Charge Motion Control Valve was specially shaped, through CAD modeling and testing, to speed up the intake charge and induce a tumble effect in the combustion cylinder. This causes the fuel to mix more thoroughly, and to burn quickly and efficiently, with reduced emissions, particularly at idle.
The CMCVs are controlled by an electronic motor, and open at a predetermined point as engine speed increases. At higher RPM, they do not affect the intake charge at all. This allows undisturbed maximum flow into the combustion chambers at wide-open throttle. The CMCV motor is sound insulated, so its operation remains transparent to vehicle occupants.
And now you know the rest of the story....
#14
RE: What is a CMCV Delete?
Excellent explanation!
A few facts though: The CMCV system's purpose is reduced emissions at idle. It has negligeable effect on HP.
Installing a CMCV delete kit MUST be done in conjunction with a proper tune. Otherwise, you will LOOSE HP and your car will start throwing codes and may go into "limp mode". HOWEVER, when done correctly, the CMCV delete is worth about 10-15 HP in gains with NO LOSS in power down low.
You can read all about the mod in this article:
http://mustang50magazine.com/techart...10_cmrc_delete
...keep in mind that this article is fairly old. There are numerous other sources for the CMCV delete kits other than the ones the article mentions.
The steedas are no different than the Ford ones, except the Steedas are billet and you have the option of buying them pre-drilled for nitrous nozzles. They are not any larger. In fact, if they were larger, that would actually HURT flow, becasue the manifold ports and the cylinder head ports would be no bigger, and their sharp edges would then be sticking into the intake path, causing turbulence.
However, if you get the proper tune for it, a CMCV kit is a great mod. It's simple to install and the gains are well worth the price.
A few facts though: The CMCV system's purpose is reduced emissions at idle. It has negligeable effect on HP.
Installing a CMCV delete kit MUST be done in conjunction with a proper tune. Otherwise, you will LOOSE HP and your car will start throwing codes and may go into "limp mode". HOWEVER, when done correctly, the CMCV delete is worth about 10-15 HP in gains with NO LOSS in power down low.
You can read all about the mod in this article:
http://mustang50magazine.com/techart...10_cmrc_delete
...keep in mind that this article is fairly old. There are numerous other sources for the CMCV delete kits other than the ones the article mentions.
The steedas are no different than the Ford ones, except the Steedas are billet and you have the option of buying them pre-drilled for nitrous nozzles. They are not any larger. In fact, if they were larger, that would actually HURT flow, becasue the manifold ports and the cylinder head ports would be no bigger, and their sharp edges would then be sticking into the intake path, causing turbulence.
However, if you get the proper tune for it, a CMCV kit is a great mod. It's simple to install and the gains are well worth the price.
#17
RE: What is a CMCV Delete?
Did you see TacoBill's latest write up on the CMCV Delete? https://mustangforums.com/m_3296684/tm.htmfd
#18
#19
Since you've necroposted after 13 years and revived the topic, I did the CMCV delete as one of my first mods:
https://www.angelfire.com/my/fan/Mus...06GT/CMDP.html
https://www.angelfire.com/my/fan/Mus...06GT/CMDP.html
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