[JBIGBOOTSY]

Quick question. How do you get an exact measurement of an engines VE?

[ReverendDexter]

Originally Posted by JBIGBOOTSY Quick question. How do you get an exact measurement of an engines VE?

Well, your mass air sensor knows how much air is being pulled through the intake. That gives you actual air consumed.
Take the half of the displacement of the motor multiplied by the rpm to see what "ideal" consumption would be.
Actual air consumed divided by ideal consumption gives you the VE.
EDIT: I realize this doesn't take the mass of fuel into account, so the above won't be "exact". You can use the fuel map to see exactly how much fuel is added per the air consumed, rpm, and throttle position. That'll most likely involve some conversions from cubic feet of air to pounds of air, as most domestic injectors are rated by pounds of fuel.


For example, if you ignore fuel, as it makes life easier:

A 5.0 turning 4500 rpm theroetically should consume 2.5L*4500rpm, or 11,250 Liters of air/fuel mixture per minute (that's 397 cubic feet for you non-metric types). If the mass air sensor is is showing consumption of 369cfm, 369/397 = .93, or 93%.

[ryans88gt]

Originally Posted by MustangMatt96GT yes i will agree... im just saying from my experience that is a HUGE $$$$ motor.... but it is hard to get a 100% VE motor NA cheap, and pretty easy to do when you are compressing air before hand.

Actually Ford claims their new 32v 5.0L motor operates at 110% VE at peak torque. Making 400+ hp from 300ish cubes in an emissions street motor is pretty impressive, but not crazy expensive.

[MustangMatt96GT]

Originally Posted by ryans88gt Actually Ford claims their new 32v 5.0L motor operates at 110% VE at peak torque. Making 400+ hp from 300ish cubes in an emissions street motor is pretty impressive, but not crazy expensive.

Thats pretty impressive...