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#Post#: 51108--------------------------------------------------
bsfc vs. rpm
By: 1manband Date: December 22, 2014, 7:02 pm
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average saw
#Post#: 51110--------------------------------------------------
Re: bsfc vs. rpm
By: Chainsawrepair Date: December 22, 2014, 7:08 pm
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I had to look up bsfc.
HTML http://en.wikipedia.org/wiki/Brake_specific_fuel_consumption
Not a term I have seen before. But trying to learn new stuff.
Thanks for sharing.
I'm so lost.
HTML http://ecomodder.com/wiki/index.php/Brake_Specific_Fuel_Consumption_%28BSFC%29_Maps
#Post#: 51112--------------------------------------------------
Re: bsfc vs. rpm
By: farmboy Date: December 22, 2014, 8:23 pm
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Me TOO!
Shep
#Post#: 51140--------------------------------------------------
Re: bsfc vs. rpm
By: 1manband Date: December 23, 2014, 4:15 pm
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if motor was held on a dyno at a steady XXXX rpm, under load...
the bsfc at that particular rpm, represents the fuel
used/necessary to do so.
the lowest bsfc shown on the actual graph line, is still pig
rich. (this is average graph of 30+ motors i had data for.
some are quite a bit higher, some quite a bit lower of course).
as motor performance is optimized, a lesser safe bsfc is usually
shot for on a dyno.
this graph does not have anything to do with "gas mileage" (ie.
cuts per gallon).
usually a bsfc graph looks like an oyster. will post one up of
this type.
#Post#: 51144--------------------------------------------------
Re: bsfc vs. rpm
By: 1manband Date: December 23, 2014, 6:58 pm
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some notes on the photo....
......the best "cuts per gallon" is the range of rpms within 300
circle in the middle.... at 1/2 load, ~4200 rpm.
#Post#: 51146--------------------------------------------------
Re: bsfc vs. rpm
By: 1manband Date: December 23, 2014, 7:13 pm
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forgot to add one more thing.
the top arc on the graph labled WOT, just means the carby
throttle butterfly was held wfo for that test line.
that arc also represents the torque curve of the motor.
#Post#: 51153--------------------------------------------------
Re: bsfc vs. rpm
By: aclarke Date: December 23, 2014, 8:31 pm
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Joe, cool stuff!
Amazing the fuel use down low and above the torque peak. I know
you used some strato motors for the average, any idea what the
strato motors bsfc is Compared to traditional piston ports?
#Post#: 51171--------------------------------------------------
Re: bsfc vs. rpm
By: 1manband Date: December 24, 2014, 4:15 am
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believe the husqvarna site lists numbers there?
#Post#: 51186--------------------------------------------------
Re: bsfc vs. rpm
By: 1manband Date: December 24, 2014, 11:36 am
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numbers lead to more numbers and eventually lead into a model of
something like this. (just a toy right now).
old 066.
#Post#: 51302--------------------------------------------------
Re: bsfc vs. rpm
By: 1manband Date: December 25, 2014, 5:01 pm
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double post
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