422 dyno fail

Bsfc is more or less an efficiency report card.
How much power can you make from “x” amount of fuel.
It is not a measurement, it is a “result” of other measurements.

The lower the bsfc number, the more efficient the engine is at turning fuel consumption into hp.

It is derived from dividing the fuel flow by the uncorrected hp.

.50 is so-so.

On the second sheet posted, at 5400rpm the uncorrected hp was 372.0, fuel flow was 184.4....... bsfc was rounded up to .50

At 5400, the sheet with the new carb and intake made 376.3 uncorrected hp, but used 231.1 lbs/hr of fuel to do it...... for a bsfc number of .61

The difference in fuel flow at that rpm is 46.7lbs/hr.
Even at a rather poor efficiency/bsfc number...... of .61...... that 46.7 lbs/hr would be worth 76.5hp...... uncorrected!!!
But instead..... it only made 4.3 more?
Even if the bsfc number has gotten as bad as .56(instead of .50), that would have put the motor at 412.6hp....... uncorrected.

One big problem when you’re trying to compare numbers from different dynos is....... you’re not only comparing the dyno itself, along with all the data acquisition....... but also the entire “facility”.
The room, the ventilation system, the exhaust, the operator...... everything.

At this point, my confidence level for the facility in question during this test session is....... low.

If for no other reason than it doesn’t sound like there was even any discussion about just how bad the bsfc numbers are.

A bsfc number of .70(for gasoline) is painfully bad.

Unfortunately, there isn’t really enough data on the sheets to effectively troubleshoot where the shortcoming is.
When you test a build that’s doing what it should, you can get away without a lot of data.
If the Hp/tq numbers are good, and happening where they should...... that and a plug reading, you’re good to go.
But when the numbers don’t make sense, you need more data.
In this situation, air flow(and with it VE numbers), along with A/F ratio data would be pretty helpful.

The new intake and carb allowed the engine to ingest roughly 50lbs/hr more fuel, yet did very little with it.
Did the 50lbs/hr enter the engine because of a big increase in air volume(drawing the fuel out of the carb)?
Or is the mixture now just super fat?

Those questions are left unanswered with the data available on the sheet.