Question about BSFC on a fuel injected car.

[Roger Heflin]

On Thu, 27 Apr 2000, Greg Hermann wrote:

> >Here is some background:
> >There is a person on the f-body fourth-gen list whose car is running
> >at a BSFC of .33 (calculated from the engine dynos lb-hr and
> >horsepower rating).
> >
> >Can a fuel injected car run reasonably with that low of BSFC?
> 
> 1. What's his compression ratio? --higher will give lower BSFC.
>
I would assume he is running somewhere around 10.5:1, but I will ask.
 
> 2. Is he using coatings (piston crowns, chambers, valve heads)--this will
> help lower it.
> 
> 3. He must be running a pretty mild cam.

I believe 220/230-112 at 0.050.

> 
> 4. Must be getting awfully good fuel atomization (higher than usual fuel
> pressure?)
> 
> 5. Must have REALLY nice chamber shape/piston crown design AND really tight
> squish clearance.
> 
> 6 18: 1 a/f would be OK for cruising type loads IF it was lighting and
> burning smoothly.
> 
> 7. At WOT, he would be getting a whole lot more power if he richened it
> down to about 13 : 1!!
> 
> BUT--the first thing I would check carefully would be the calibration of
> his dyno equipment!! (Maybe it reads in California HP!
> 


I told him the numbers seemed suspect from what I knew.

			Roger

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