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#4606268 - 12/17/17 01:47 PM Volumetric Efficiency
borgward Offline


Registered: 09/13/10
Posts: 128
Loc: 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?

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#4606456 - 12/17/17 05:20 PM Re: Volumetric Efficiency [Re: borgward]
CR94 Offline


Registered: 03/20/16
Posts: 1120
Loc: Western S.C. since 1996
You can calculate it if you know the engine displacement and the WOT air flow rate at a known engine speed.


Edited by CR94 (12/17/17 05:20 PM)
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#4606562 - 12/17/17 07:05 PM Re: Volumetric Efficiency [Re: borgward]
Eddie Offline


Registered: 12/07/03
Posts: 9566
Loc: 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
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#4606862 - 12/18/17 02:09 AM Re: Volumetric Efficiency [Re: Eddie]
CR94 Offline


Registered: 03/20/16
Posts: 1120
Loc: Western S.C. since 1996
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).
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#4606928 - 12/18/17 06:32 AM Re: Volumetric Efficiency [Re: borgward]
SHOZ Offline


Registered: 06/28/03
Posts: 5746
Loc: 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%.
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#4606933 - 12/18/17 06:43 AM Re: Volumetric Efficiency [Re: borgward]
Eddie Offline


Registered: 12/07/03
Posts: 9566
Loc: Florida, Cape Coral
Yes CR94. Now at almost 80 year old, I forget some stuff. Sorry. Ed Hayes
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#4606965 - 12/18/17 07:47 AM Re: Volumetric Efficiency [Re: CR94]
DriveHard Offline


Registered: 11/24/03
Posts: 1067
Loc: 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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