BPW constant...here's what I'm thinking... - Third Generation F-Body Message Boards

V8Astro Captain · 05-22-2002, 06:59 PM

I've searched thru the archives a couple times trying to figure out if raising the BPW makes the AFR richer or leaner.

Maybe I'm looking at this wrong but consider this...

Using the BPW constant formula I find the BPW for a 350 with 61.2 lb/hr injectors...and then the same 350 with 90 lb/hr injectors.

Val = 1461.5 * (VOL/RATE)

61.2 lb/hr = BPW 135
90 lb/hr = BPW 91

Since a bigger injector will flow more lb/hr...then wouldn't a lower number correspond to a leaner AFR? If the 90 lb/hr injector can flow more fuel in a given amount of time then wouldn't you need to lean it out. So by that reasoning wouldn't a lower number = a "leaner" BPW?

Brent · 05-22-2002, 11:13 PM

Raising the BPW constant richens the fueling globally. The opposite leans fueling globally.

V8Astro Captain · 05-22-2002, 11:31 PM

That's what I thought. If you search the archives you'll find that every post says the opposite of the one right before it.