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regis101 Samba Member
Joined: July 28, 2005 Posts: 2078 Location: Livermore, Ca
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Posted: Tue May 10, 2016 4:07 pm Post subject: Engine efficiency, Comparing I4's, WB's and Subies |
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Remember this link?
http://www.members.shaw.ca/albell/engine-rpm-swap.html
I found a formula that gives results as he has listed so I plugged in the 2.0 Zetec and the 2.2 Ecotec. The result is 159.5 for the Zetec and 168.6 for the Ecotec.
BMEP=(Torque x 12 x 33000 / 5252) / (Displacement x PPR)
Displacement is for CI so you need to convert CC's and for a Four stroke engine PPR equals 1/2 or .5 as it fits the formula. Peak torque rpm is not important for the formula.
Might seem generic but at least you can slip the efficiency of a proposed engine into his existing tremendous amount of work to see where it'd fit.
Just sayin' _________________ Peace, Regis |
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Merian Samba Member
Joined: January 04, 2014 Posts: 5212 Location: Orygun
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Posted: Tue May 10, 2016 4:34 pm Post subject: Re: Engine efficiency, Comparing I4's, WB's and Subies |
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engine performance will depend on fuel and air mix and flow regimes, not to mention the exhaust
so, that siimple formula doesn't really do what you think _________________ .... |
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regis101 Samba Member
Joined: July 28, 2005 Posts: 2078 Location: Livermore, Ca
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Posted: Tue May 10, 2016 5:30 pm Post subject: Re: Engine efficiency, Comparing I4's, WB's and Subies |
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So then when you know your engines performance , plug in the numbers.
You're thinkin' too hard again.
I'm just the messenger. _________________ Peace, Regis |
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levi Samba Member
Joined: February 11, 2005 Posts: 5522 Location: Las Vegas
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Posted: Tue May 10, 2016 7:19 pm Post subject: Re: Engine efficiency, Comparing I4's, WB's and Subies |
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Frank Grunthaler is one of those kinda-smart guys.
So when he says that the 1.8t is right up close to the top of his list, that's good enough for me.
No wonder I like my Flint-reversed 1.8t 5 speeder so much.
I'm just about to be coming up on my 1 year mark with Andrew's engine/5 speed transmission combo.
It's my Daily Driver, no problems, loving this thing and I haven't even added the ECM upgrade chip yet although it is sitting in my hands right now. Just need to wander out there and plug it in. _________________ One of these days I'm gonna settle down,
but till I do I won't be hangin round.
Going down that long lonesome highway,
gonna see life my way
https://youtu.be/cSrL0BXsO40 |
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