I just had my 406 dynoed Monday smile.gif and was wondering if anyone knew the forumla to convert from power to flow rate of the heads. I would like to see what the heads are flowing at, since I did the alot of work myself. Do you use corrected power or actual power?

dyno results

http://www.chevelles.com/showroom/Enganeer/tempdynoholleyhpcarbsheet1.jpg

Thanks -John

Those are some nice numbers only wish the powerband was wider.(peak tq-peak hp only 900 rpms difference)
Still good numbers. Im not aware of any hp=head flow conversion b/c hp is affected by so many other things.

goodluck

Doggy69,

Your right about the narrow band of peak tq-to-hp being only 900 rpm apart. But I noticed something. There are two torque peaks very similiar. The first peak was around 4200 to 4300 when it was around 476 ft-lbs then dips slightly and jumps back up to around 479 ft-lbs around 4700 to 4800 rpm. The HP peaked at 486 from 5600 to 5700 rpm. So the band width could run from 4200 to 5700. Spreads the range to 1500 rpm.

I wonder if these two torque peaks are a result of some sort of resonance freq with pulse waves helping scavange exhaust and pulling more from the intake. The volume efficeny is very high. Here are the actual values measured in the dyno room for volume eff.

http://www.chevelles.com/showroom/Enganeer/tempdynoholleyhpcarbsheet2.jpg

Just trying to figure out the info. Anyone else have some insight. Thanks

- John

Originally posted by Enganeer:
I just had my 406 dynoed Monday smile.gif and was wondering if anyone knew the forumla to convert from power to flow rate of the heads. I would like to see what the heads are flowing at, since I did the alot of work myself. Do you use corrected power or actual power?

dyno results

http://www.chevelles.com/showroom/Enganeer/tempdynoholleyhpcarbsheet1.jpg

Thanks -John =
John,
There are formulas to determine approximatly what power a certain head is capable of which assume everything else is right but you can't go the other way.
An engine dyno equipped with a "hat" can measure total air flow into the engine which can be used in part to calculate fuel ratio among other things but this is not the same as static flow on a bench at 28 inches.

Dang! Well, I am still very happy with the results. Thanks Mike.

- John

Originally posted by Enganeer:
Dang! Well, I am still very happy with the results. Thanks Mike.

- John =
Forgot to mention but nice torque curve graemlins/thumbsup.gif
Don't be concerned with the AFR numbers, they are typical calculated acceleration test numbers.
It will actually be richer than what it shows by quite a bit. ;)