Mevi
U wanna try me young boy?
Joined: May 2001
Posts: 1,024
The MEVI, Middle East Variable Intake (Don't know the official name) is a 4th Gen thing...
The Infiniti I30 is sold in the Middle East (Bahrian, Saudi etc) under the name Maxima, and it has a specially-designed intake.
It's not a true Dual-Plane intake (like the Taurus SHO, or the 3.8 SPI from the later model Windstar/Mustang) which has two distinct air paths from the air filter to each cylinder (one long, for low revs - one short for high revs). Instead, it's a Dual-Plenum design that has a second plenum directly above the lower intake, providing a shorter path for the Dynamic Supercharging effect (described below). The second plenum is 'activated' by opening a set of butterfly valves. These valves are opened by a vacuum actuator at the appropriate engine speed.
Dynamic Supercharging is the concept that when the intake valve closes it causes a pressure wave to travel from the outside of the intake valve back towards the air filter. When the pressure wave reaches the plenum (the common part of the intake track between the throttle body and the individual runners) it bounces back towards the intake valve. If the intake valve opens just as the pressure waves gets back, then more air is forced into the cylinders and it increases the volumetric efficiency. There is a specific engine speed at which this Dynamic Supercharging effect happens, and the length of the runners changes this engine speed, because of the time it takes the wave to travel.
Intake spacers change this effect to a lower engine speed (because the wave takes longer) giving the engine more bottom-end grunt (marginally, and at the cost of mid-range grunt)
The dual-plenum design gives the engine TWO speeds at which dynamic supercharging happens - at high speed the upper plenum valves open and the shorter path to the upper plenum gives the dynamic superchargin effect at higher engine speeds, increasing breathing and prolonging the powerband.
That's it, in a nutshell.
The Infiniti I30 is sold in the Middle East (Bahrian, Saudi etc) under the name Maxima, and it has a specially-designed intake.
It's not a true Dual-Plane intake (like the Taurus SHO, or the 3.8 SPI from the later model Windstar/Mustang) which has two distinct air paths from the air filter to each cylinder (one long, for low revs - one short for high revs). Instead, it's a Dual-Plenum design that has a second plenum directly above the lower intake, providing a shorter path for the Dynamic Supercharging effect (described below). The second plenum is 'activated' by opening a set of butterfly valves. These valves are opened by a vacuum actuator at the appropriate engine speed.
Dynamic Supercharging is the concept that when the intake valve closes it causes a pressure wave to travel from the outside of the intake valve back towards the air filter. When the pressure wave reaches the plenum (the common part of the intake track between the throttle body and the individual runners) it bounces back towards the intake valve. If the intake valve opens just as the pressure waves gets back, then more air is forced into the cylinders and it increases the volumetric efficiency. There is a specific engine speed at which this Dynamic Supercharging effect happens, and the length of the runners changes this engine speed, because of the time it takes the wave to travel.
Intake spacers change this effect to a lower engine speed (because the wave takes longer) giving the engine more bottom-end grunt (marginally, and at the cost of mid-range grunt)
The dual-plenum design gives the engine TWO speeds at which dynamic supercharging happens - at high speed the upper plenum valves open and the shorter path to the upper plenum gives the dynamic superchargin effect at higher engine speeds, increasing breathing and prolonging the powerband.
That's it, in a nutshell.
so when ppl say that they have sent off to get their MEVI, what exactly does that mean. In other words, what do you send off and what do you get back. Do the people who do this do something to your car or do they send you something brand new. Any pictures??
Senior Member
Joined: Aug 2001
Posts: 1,503
Originally posted by ross
so when ppl say that they have sent off to get their MEVI, what exactly does that mean. In other words, what do you send off and what do you get back. Do the people who do this do something to your car or do they send you something brand new. Any pictures??
so when ppl say that they have sent off to get their MEVI, what exactly does that mean. In other words, what do you send off and what do you get back. Do the people who do this do something to your car or do they send you something brand new. Any pictures??
they get the mevi shipped back to them
just like ordering something online... which is.. err... basically what your doing
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