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Canucker
Dodge Dakota
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10/30/2002
18:27:56
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 Subject: Volumetric Efficiency (Stock)
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So I calculated my volumetric efficiency based on my stock dyno run I did ... the spreadsheet can be seen here:
Stock Dyno
I just used a formula I found off some performance website, so I haven't verified or validated it. Any thoughts? Insight?
I am almost willing to bet that the peak in the VE (which falls inline with the peak in TQ) is due mostly to the intake manifold .. otherwise, it looks like the VE curve would be flat.
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yates-in-DE
GenIII
10/30/2002
18:39:54
| RE: Volumetric Efficiency (Stock)
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What is that on a V-6? ;}
Later,
MyVW Killer
Lynn
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Lab Rat
GenIII
10/30/2002
19:48:23
| RE: Volumetric Efficiency (Stock)
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Canucker,
From the numbers it seems you have a 4.7. Am I right?? If so, lemme know, I have something you might find interesting.
LR
Gibson Dual Sport, AirForce One air intake, Jet II, Jet TBS, 180 stat, IAT, TPS, no viscous fan, Lakewood traction bars, "Wilson" antenna ball...when are we gonna see some real parts??!!
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IlovemydakRT
Dodge Dakota
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10/30/2002
23:32:41
|  RE: Volumetric Efficiency (Stock)
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VE for a NA engine is normally between %65-%85...
...if I remeber correctly...
Donald C.
2000 Dakota R/T RC
JBA Headers, Magnaflow Exhaust, K&N FIPK
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EyeTrip
R/T
10/31/2002
03:15:29
| RE: Volumetric Efficiency (Stock)
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How is it possible to get over 100% VE without force induction? I don't think it's possible.
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Canucker
Dodge Dakota
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10/31/2002
10:27:07
| RE: Volumetric Efficiency (Stock)
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Yates:
huh? no I'm not on a V6 .. though I bet I could drive over a few ;)
Lab Rat:
Yeah ... 4.7L. what do ya got of interest?
Eyetrip:
it is possible to get RPM ranges that are abot 100% .. how do you think little 4-cyl. V-Tec engines make the hp they do?
My curve may be off a bit, I used a 15% drivetrain loss to get those VE numbers (the hp/TQ is rear wheel numbers) .. if I used a higher drivetrain loss (20%) then the VE numbers are even higher ... if I use a lower (10%) then the VE numbers get lower .. but 10% seems pretty low for a drivetrain loss.
Getting a VE greater than 100% on N.A. engines is done through port tuning .. in the 4.7L case, I'm guessing its the runner length tuning of the manifold.
IlovemydakRT:
VE of an engine isn't some arbitrary number that is assigned to an engine. it can be as low as 30% in some places, and well over 100% in places for a well designed engine.
FYI the average VE turnes out to be 81.8% so maybe that's the number you're thinking of
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EyeTrip
R/T
10/31/2002
13:11:13
| RE: Volumetric Efficiency (Stock)
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I thought the V-Tec engines make the hp with that cool decal on the cowl.
BAAHAHAHA Just kidding
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Lab Rat
GenIII
10/31/2002
16:12:02
| RE: Volumetric Efficiency (Stock)
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EyeTrip, from Holley:
"A highly tuned intake and exhaust system with efficient cylinder head porting
and a camshaft ground to take full advantage of the engine's other equipment
can provide such complete cylinder filling that a volumetric efficiency of
100%, or slightly higher, is obtained at the speed for which a system is tuned."
LR
Gibson Dual Sport, AirForce One air intake, Jet II, Jet TBS, 180 stat, IAT, TPS, no viscous fan, Lakewood traction bars, "Wilson" antenna ball...when are we gonna see some real parts??!!
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EyeTrip
R/T
10/31/2002
18:19:58
| RE: Volumetric Efficiency (Stock)
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Thanks Lab Rat
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Dak-five-oh
Dodge Dakota
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10/31/2002
21:55:52
| RE: Volumetric Efficiency (Stock)
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Achieving VE higher then 100 percent is done by tuning the runner length to correspond to an RPM point. As air is coming in through the open intake ports it is moving. When the intake valve slams shut it creates a shockwave that runs backward out of the intake. After it hits static air it is reflected back toward the intake valve and if the intake vavle is open then the shockwave travels into the cylinder creating slightly higher then atmospheric. Thus a VE of over 100% is created. Anyone correct me if there is anything incorrect about this.
5/0
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Canucker
Dodge Dakota
JOIN HERE
11/01/2002
10:14:06
| RE: Volumetric Efficiency (Stock)
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Message:
Is there an echo in here?
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