Whats CMCV Delete plates
10-19-2007, 09:10 AM
#11
Cut & Paste Expert
Join Date: May 2007
Location: NW Arkansas
Posts: 13,322
RE: Whats CMCV Delete plates
ORIGINAL: 99flhr
Ford Dude is correct, but also consider that restricting the intake passage at low speeds increases air velocity and builds mid range power through better cylinder filling.
This has been achieved many ways:
Multi valve heads
Variable cam timing
2 valve operation switching to 4 valve @ high rpm (Honda)
Variable intake tract length (BMW)
Twin intakes where the 2nd set remains closed until high rpm (Ford SHO V6, Yamaha engine)
So, it`s quite possible that peak HP would increase by removing these butterflys, it`s also possible that torque would decrease in the low/mid range. I guess we`ll never know unless someone dyno`s a car before/after, preferably with no other mods.
Just a theory, not trying to rain on anybodies parade.
ORIGINAL: Ford_Dude
charge motion control valve
its a set of butterfly valves one on each cylinder
they restrict air flow for fuel economy
they open fully at 2500 rpm but even then they make air flow less than it could be
so the deletes remove them and help air flow
also with the deletes you can remove the motor that opens the valves and save a little weight
charge motion control valve
its a set of butterfly valves one on each cylinder
they restrict air flow for fuel economy
they open fully at 2500 rpm but even then they make air flow less than it could be
so the deletes remove them and help air flow
also with the deletes you can remove the motor that opens the valves and save a little weight
This has been achieved many ways:
Multi valve heads
Variable cam timing
2 valve operation switching to 4 valve @ high rpm (Honda)
Variable intake tract length (BMW)
Twin intakes where the 2nd set remains closed until high rpm (Ford SHO V6, Yamaha engine)
So, it`s quite possible that peak HP would increase by removing these butterflys, it`s also possible that torque would decrease in the low/mid range. I guess we`ll never know unless someone dyno`s a car before/after, preferably with no other mods.
Just a theory, not trying to rain on anybodies parade.
10-19-2007, 09:14 AM
#12
5th Gear Member
Join Date: Jan 2006
Location:
Posts: 4,333
RE: Whats CMCV Delete plates
the original plates are designed as a manifold vacuum attenuation system. under low rpm's, they create a narrower intake runner; increasing air velocity and thus maintaining sufficient manifold vacuum. they open at 3000 RPM to "clear the way" for the increased airflow demands of the higher rpms. the effect is, they help generate low end torque and then "get out of the way" at higher rpm's. the problem is, they don't "get out of the way" well enough, and thus can restrict airflow. therefore, removing them and substituting plates with larger openings is good for some hp gains up top but torque loss down low. hope this helps.
10-19-2007, 04:19 PM
#14
RE: Whats CMCV Delete plates
Doug did a dyno, 9 RWHP and little to no loss of torq to speak of except for maybe 1500-1700 and below....no exactly where we operate the car from anyway.....and he doesnt sell them so he isnt try to bump the numbers either
10-19-2007, 04:31 PM
#17
RE: Whats CMCV Delete plates
ORIGINAL: 2cokeman
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Yes a tune it need for a couple things....the motor has to be shut off since you have either removed it completely or since the rods have been removed. This way you do not get a CEL once installed.
10-19-2007, 04:39 PM
#18
5th Gear Member
Join Date: May 2006
Location: Tennessee
Posts: 4,182
RE: Whats CMCV Delete plates
Some here are asking stupid questions or making stupid remarks....If ford put them there for a reason then why port and polish your heads? why bolt on long tube headers? Why are MY CMCV plates made by Ford Racing Performance Parts? 
10-19-2007, 04:51 PM
#19
5th Gear Member
Join Date: Oct 2006
Location: Baytown, TX
Posts: 3,115
RE: Whats CMCV Delete plates
Ford put the plates there for a little fuel savings
Ford racing made the deletes because they knew people that want power would want to get rid of them
it may only be a little power but people want it
Ford racing made the deletes because they knew people that want power would want to get rid of them
it may only be a little power but people want it
10-19-2007, 04:52 PM
#20
5th Gear Member
Join Date: May 2006
Location: Tennessee
Posts: 4,182
RE: Whats CMCV Delete plates
I was being sarcastic [&:]
ORIGINAL: Ford_Dude
Ford put the plates there for a little fuel savings
Ford racing made the deletes because they knew people that want power would want to get rid of them
it may only be a little power but people want it
Ford put the plates there for a little fuel savings
Ford racing made the deletes because they knew people that want power would want to get rid of them
it may only be a little power but people want it