Question about BSFC on a fuel injected car.

[nacelp]

The best good numbers that I've heard of were from Yosimura, and that was a
.38.   That was a truely one of a kind "R+D"  mule engine.
Easy to claim anything, and be doing so in good faith.  Takes a real 1st
class set up to make legit verifable claims.  I saw a high rent dyno cell
one time where they had the air temp sensor well removed from the intake air
column.
Course the whole issue is kinda mute.  Comparing numbers from one dyno to
another is at times a real apples and oranges deal.  I won't repeat my
feelings about dynos again
Grumpy


> > >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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