Close. Chevy Volt. :) :bunnydance::helmet:

Would it be safe to assume, that if we are talking big blocks per say, that BSFC numbers, can go up with things like, longer stroke cranks, thick piston rings, windage control, aside from the obvious, like combustion efficiency, ignition timing, etc?

I would think that a 700HP 4 inch stroke, running modern ring package good windage,, would have lower BSFC numbers, than a 700HP 4.5" stroke deal running an old school ring package, windage, etc. Seems like some of the guys building NA engines, with low tension rings, vacuum pumps, short stroke, good heads, cam, compression, are getting some really low brake specifics.

Yes, the friction factor thing seems to ad 1% and change, the higher the CF, the worse it seems too. Again, thats why the last 3 or 4 dyno sessions doing serious tuning on this project in search for most accurate hp gains i been taking advantage of the cool, dry air conditions and trying to only dyno when air density is around 98% which puts CF near low 2% range. Now, i have all new dyno data aquisition and software from performance trends i will be installing soon side by side the depac. How the friction factor and CF compares is going to be very interesting!

My brake specifics on this low compression 548 running carbed once you turn it past 5800 are nothing to write home about, once you get to 6000, 6200 they are in the .6 range. They did, however, clean up slightly into the .58s with the efi.
As far as the negative correction factor dyno session and sub
.4 bsfcs i was talking about, it was on a 2 stroke snowmobile on a dyno where the dyno cell was cooled to sub 32 degrees, 2 strokes make best hp on edge of burndown

That's how I tuned mine. Kept removing jet till I saw aluminum, add new piston then go up 1 jet. :)

Smitty, what's norms website? I have a few 4150's, I'm a carb kinda guy.

good cylinder combustion chambers and a close to ideal homogeneous air fuel mixture and run it on the verge of meltdown.

Asking because i see engine builders on speedtalk and yellow bullet getting bsfc's of low 4s or even lower on NA bbc builds. I was always under the impression bsfc's were more an indicator of how efficient the engine build is, rather than the fuel mixture.

When I dynoed my 454 I was around .52 bsfc and that was where it liked it. The next day we dyno'd Jim's 565 and played around with the fuel injection all day and it was about .43 where it ended up at. If that means anything.

Is there a summary of results? What is the outcome?
Carbs suck, EFI rules, some new carb guy who charges lipship prices is king. Is that the jist?

Its not thst simple, there isnt one winner or just one "answer", its a informational thread. The REAL winner, the real winner is Franks buddy whos boat drops to 4 cylinders hot thats getting fixed because of THIS thread and hes never even read it or been involved!:ernaehrung004: