Interestingly, the website this video plugs has a completely different definition of VE to the one presented in the vid itself! :- "Volumetric efficicncy is defined as the volume flow rate of air into the intake system divided by the rate at which volume is displaced by the piston".
Sorry the pictorial depiction is not correct. Vol efficiency is amount of air flow in the cylinder divided by the Swept volume (TDC vol minus BDC vol) during intake or suction stroke.
@dhiru6342 you are absolutely correct. If a 1 litre engine can suck in 1 litre of air it has 100% VE. What has been depicted on this video is actually compression ratio expressed as a percentage.
sorry no. volumetric efficiency is about how well the cylinders are filled. if the cylinder is 200cc, is it getting filled with 200cc of air? or air/fuel mix if you must., that would be 100%volumetric efficiency.
what i meant was volumetric efficiency .. and people often dont account for the fact that air isnt oxygen only .. its argon nitrogen co2 etc... and then some oxygen .. and those gases contain energy too ... compress them and ignite fuel and you get power ... its the expansion of gasses that do the work ... nothing else .. so even if you dont get a 100% clean burn you can still create lots of pressure by the rapid expansion of gasses
VE = Volume of Air Out Exhaust / Volume of Air Entering Cylinder .... which can never be greater than 100%. You can't create mass! It doesn't matter what pressure the air is at... volume is volume.
VE = Volume of Air Out Exhaust / Volume of Air Entering Cylinder .... which can never be greater than 100%. You can't create mass! It doesn't matter what pressure the air is at... volume is volume.
@joeblob7 she knows what she is on about. it is not about the ratio of air in /out. it is how well the cylinder is filled.if you have small valves etc the cylider will not fill 100%. whereas if you use a blower you can fill a 1000cc cylinder with 1200cc air and achieve 120%VOLUMETRIC efficiency.
and to help increase volumetric efficiency people often raise the compression ratio and increase boost levels .... so more air could be compressed first with the turbo and then with the piston re-compressing the charge ... and bam a more violent explosion creating a bigger shockwave resulting in more pressure ..... internal combustion engine are simple... diesel end up in the high 60's before drivetrain losses gasoline end up in the mid 40% efficiency before drivetrain loss ....
false ..... volumetric efficiency is about how much work you can extract out of a given mass of fuel ... say the amount of fuel and its energy content = 1000hp but you only got 200hp out of it your engine isnt really efficient ....
producing power is the action of the shockwave when an explosion occurs in the cylinder pushing down the piston .... the more force it has the more power ..... of course more air compressed in will create a more brutal explosion .....
i want just to thank you for this video but i want to say that you are completely wrong 100%.... as the volumetric efficiency is thr ratio between actual mass entering cylinder and the theoretical mass entering the engine cylinder so vol-efficiency is mass ratio not volume ratio as we calculate it ;) ;) ;) ;)
thanks for comment,the natural aspirated engine is that no turbocharger or supercharger is used to force an extra air to enter the cylinder under the normal or natural operating pressure.
A natural aspired motor hopes to one day become a rock-in roll star. They hope that if you listen to them enough, you'll want to buy there CD's which will allow them to aspire to become natural in an engine. Makes perfect sense after about 20 beers.
Interestingly, the website this video plugs has a completely different definition of VE to the one presented in the vid itself! :- "Volumetric efficicncy is defined as the volume flow rate of air into the intake system divided by the rate at which volume is displaced by the piston".
XPLAlN 1 month ago
Sorry the pictorial depiction is not correct. Vol efficiency is amount of air flow in the cylinder divided by the Swept volume (TDC vol minus BDC vol) during intake or suction stroke.
dhiru6342 1 month ago
@dhiru6342 you are absolutely correct. If a 1 litre engine can suck in 1 litre of air it has 100% VE. What has been depicted on this video is actually compression ratio expressed as a percentage.
XPLAlN 1 month ago
sorry no. volumetric efficiency is about how well the cylinders are filled. if the cylinder is 200cc, is it getting filled with 200cc of air? or air/fuel mix if you must., that would be 100%volumetric efficiency.
gilessmokey 1 year ago
what i meant was volumetric efficiency .. and people often dont account for the fact that air isnt oxygen only .. its argon nitrogen co2 etc... and then some oxygen .. and those gases contain energy too ... compress them and ignite fuel and you get power ... its the expansion of gasses that do the work ... nothing else .. so even if you dont get a 100% clean burn you can still create lots of pressure by the rapid expansion of gasses
does this make sense gilessmonkey???
jkk20 1 year ago
This video is vague now as BMW has achieved 100+% VE on their N/A motors
kemardrakes 1 year ago
This has been flagged as spam show
VE = Volume of Air Out Exhaust / Volume of Air Entering Cylinder .... which can never be greater than 100%. You can't create mass! It doesn't matter what pressure the air is at... volume is volume.
joeblob7 1 year ago
VE = Volume of Air Out Exhaust / Volume of Air Entering Cylinder .... which can never be greater than 100%. You can't create mass! It doesn't matter what pressure the air is at... volume is volume.
joeblob7 1 year ago
@joeblob7 she knows what she is on about. it is not about the ratio of air in /out. it is how well the cylinder is filled.if you have small valves etc the cylider will not fill 100%. whereas if you use a blower you can fill a 1000cc cylinder with 1200cc air and achieve 120%VOLUMETRIC efficiency.
gilessmokey 1 year ago
far from what this video is saying really .....
jkk20 1 year ago
and to help increase volumetric efficiency people often raise the compression ratio and increase boost levels .... so more air could be compressed first with the turbo and then with the piston re-compressing the charge ... and bam a more violent explosion creating a bigger shockwave resulting in more pressure ..... internal combustion engine are simple... diesel end up in the high 60's before drivetrain losses gasoline end up in the mid 40% efficiency before drivetrain loss ....
jkk20 1 year ago
@jkk20 false again....no diesel is in the high 60% THERMALefficiency
gilessmokey 1 year ago
false ..... volumetric efficiency is about how much work you can extract out of a given mass of fuel ... say the amount of fuel and its energy content = 1000hp but you only got 200hp out of it your engine isnt really efficient ....
producing power is the action of the shockwave when an explosion occurs in the cylinder pushing down the piston .... the more force it has the more power ..... of course more air compressed in will create a more brutal explosion .....
jkk20 1 year ago
@jkk20 false.... it is THERMAL efficiency that is about how much work you can extract from the fuel.
gilessmokey 1 year ago
i want just to thank you for this video but i want to say that you are completely wrong 100%.... as the volumetric efficiency is thr ratio between actual mass entering cylinder and the theoretical mass entering the engine cylinder so vol-efficiency is mass ratio not volume ratio as we calculate it ;) ;) ;) ;)
alashrdfs 1 year ago
@alashrdfs what
niceprince 1 year ago
what is a natural aspirated engine??
motorwolrdpl 3 years ago
thanks for comment,the natural aspirated engine is that no turbocharger or supercharger is used to force an extra air to enter the cylinder under the normal or natural operating pressure.
masterconcept 3 years ago
thanks!!
motorwolrdpl 3 years ago
A natural aspired motor hopes to one day become a rock-in roll star. They hope that if you listen to them enough, you'll want to buy there CD's which will allow them to aspire to become natural in an engine. Makes perfect sense after about 20 beers.
joefacc 2 years ago
@motorwolrdpl Running engine without using supercharger or turbocharge.
abcfjfjfjfj 2 months ago