Fuel Economy related papers

[tasdrouille]

Vanner, what you are looking for is a bsfc map (brake specific fuel consumption). It usually plots fuel consumption per hp per hour against bmep (brake mean effective pressure, torque / displacement). You might try goggle, but bsfc maps are often hard to come by.

[Vanner]

So I've noticed. But that is exactly what im looking for, thanks very much for the tip!

[aerohead]

Originally Posted by Vanner

So I've noticed. But that is exactly what im looking for, thanks very much for the tip!

I've got some ancient stuff,might be some small-block Chevy stuff in there.I'll look.If we new the van's road load horsepower,and driveline efficiency,knowing the mpg,we could reverse-engineer for the bsfc.I know that Hucho has some general bsfc maps in his book.They say,that given a few parameters,that other engines can be superimposed onto these maps.I have little experience with such things.Too bad the car makers don't publish stuff like this.Kinda like buying a laptop with no data for for the CPU.

[aerohead]

Originally Posted by Vanner

Tas, that's an impressive list. Do you perhaps have documentation related to output vs. input for any specific engines (especially the chevy 305)? Something like torque vs. fuel consumption? Any leads on where to find it? Thanks for any advice...

Vanner,I dug through my materials.No specific data for 305,but found BSFC maps for 250,289,and 350 cu in engines.0.45 lbs/hp-hr appears to be top efficiency for these small block engines.For the 350(most like your 305) 0.45 lbs occurs as a very narrow island of performance,within a boundary between 1,350-2,600 rpm,and a loading of 55-105 horsepower.Outside those parameters,and fuel consumption goes up.This is a 8.5:1 compression ratio engine.

[MazdaMatt]

ooooooh, i like the one for big trucks. My honda uses less fuel in 8 hours at full throttle on a race track than my F350 cube uses just getting to the race track doing 90km/h.

[gasti_ako]

this is useful for newbies like me

[CoupeDude]

Originally Posted by aerohead

Vanner,I dug through my materials.No specific data for 305,but found BSFC maps for 250,289,and 350 cu in engines.0.45 lbs/hp-hr appears to be top efficiency for these small block engines.For the 350(most like your 305) 0.45 lbs occurs as a very narrow island of performance,within a boundary between 1,350-2,600 rpm,and a loading of 55-105 horsepower.Outside those parameters,and fuel consumption goes up.This is a 8.5:1 compression ratio engine.

Aerohead, where did you get the BSFC maps for the 350 Chevy. I'd really like to get a copy. Thanks.

[Vanner]

Thank you aerohead, you rule. I will definitely apply these numbers, the best way being to just put a smaller engine in. Maybe a smaller throttle body would be good enough... No, what me and my empty wallet are actually going to do is just not take the van outside 1350-2600 rpm. Haha with a final drive of 3.73:1 that's like 30 mph. Anyone have a super low (~2.30) heavy duty rear end laying around??

[PaleMelanesian]

Paper #2 on the list just went dark. Anyone have a copy or want to host it somewhere?

[tasdrouille]

Looks like Transport Canada Environmental Affairs pulled it. I wrote to ask what's going on.

Google still have it cached though