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Volumetric Efficiency #4606268
12/17/17 02:47 PM
12/17/17 02:47 PM
Joined: Sep 2010
Posts: 134
Central Texas
borgward Offline OP
borgward  Offline OP

Joined: Sep 2010
Posts: 134
Central Texas
How do I determine the Volumetric Efficiency of stock 2013 Ford Fiesta 1.6L SE? Is it stated somewhere or do I need to calculate it?

Re: Volumetric Efficiency [Re: borgward] #4606456
12/17/17 06:20 PM
12/17/17 06:20 PM
Joined: Mar 2016
Posts: 1,958
Western S.C.
CR94 Offline
CR94  Offline

Joined: Mar 2016
Posts: 1,958
Western S.C.
You can calculate it if you know the engine displacement and the WOT air flow rate at a known engine speed.

Last edited by CR94; 12/17/17 06:20 PM.

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Re: Volumetric Efficiency [Re: borgward] #4606562
12/17/17 08:05 PM
12/17/17 08:05 PM
Joined: Dec 2003
Posts: 10,092
Florida, Cape Coral
Eddie Offline
Eddie  Offline

Joined: Dec 2003
Posts: 10,092
Florida, Cape Coral
The maximum BMEP or max torque is the lowest GPHPH or max eficency. BMEP=BRAKE MEN EFFECT PRESSURE AND GPHPH GALLONS PER HORSE POWER PER HOUR. Ed


CX5 Touring 2.5L :-)
Re: Volumetric Efficiency [Re: Eddie] #4606862
12/18/17 03:09 AM
12/18/17 03:09 AM
Joined: Mar 2016
Posts: 1,958
Western S.C.
CR94 Offline
CR94  Offline

Joined: Mar 2016
Posts: 1,958
Western S.C.
Originally Posted By: Eddie
The maximum BMEP or max torque is the lowest GPHPH or max eficency. BMEP=BRAKE MEN EFFECT PRESSURE AND GPHPH GALLONS PER HORSE POWER PER HOUR. Ed
No, although maximum BMEP and minimum BSFC (max efficiency) sometimes come at about the same speed-load combination.

You meant Brake Mean Effective Pressure, and Gallons per Horsepower-Hour (= gallons per hour per horsepower).


2011 Toyota Prius now at 97K
1981 Mazda GLC (323) retired at 606K
1972 Subaru DL retired at 190K
1954 Chevrolet retired at 121K
Re: Volumetric Efficiency [Re: borgward] #4606928
12/18/17 07:32 AM
12/18/17 07:32 AM
Joined: Jun 2003
Posts: 5,979
Illinois
SHOZ Offline
SHOZ  Offline

Joined: Jun 2003
Posts: 5,979
Illinois
I use an OBDII data reader and monitor Load. This is in effect the calculated VE the engine is seeing. Airflow X rpm. With a turbo or SC this value will rise well over 100%.


2008 Hyundai Accent 1.6L 5 sp manual hatchback
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Re: Volumetric Efficiency [Re: borgward] #4606933
12/18/17 07:43 AM
12/18/17 07:43 AM
Joined: Dec 2003
Posts: 10,092
Florida, Cape Coral
Eddie Offline
Eddie  Offline

Joined: Dec 2003
Posts: 10,092
Florida, Cape Coral
Yes CR94. Now at almost 80 year old, I forget some stuff. Sorry. Ed Hayes


CX5 Touring 2.5L :-)
Re: Volumetric Efficiency [Re: CR94] #4606965
12/18/17 08:47 AM
12/18/17 08:47 AM
Joined: Nov 2003
Posts: 1,336
Middle of Iowa
DriveHard Offline
DriveHard  Offline

Joined: Nov 2003
Posts: 1,336
Middle of Iowa
Originally Posted By: CR94
You can calculate it if you know the engine displacement and the WOT air flow rate at a known engine speed.


This is the only reasonable answer I have seen. Don't be surprised if it exceeds 100% near the torque peak, even in a N/A engine.


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