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Air Flow grams/sec for 383??

vetteboy86

Well-known member
Joined
May 26, 2003
Messages
2,760
Location
IN
Corvette
1986 Black "Indy 500 Pace car replica"
Anyone know what airflow to expect from my 383? If someone could give me numbers for a 350 i'm sure that will get me close enough.
 
are you asking what CFM your engines THROTTLE BODY or CARB requires?

or are you asking how many cfm at a certain valve lift a cylinder head port must flow to reach a set hp number?

perhaps the fuel injecters flow rate?

could you get into ALOT more detail about what your trying to find out???

http://www.rbracing-rsr.com/runnertorquecalc.html

http://www.chevyhiperformance.com/techarticles/41598_cylinder_head_flow_bench_database/

http://www.rbracing-rsr.com/fuelinjectors.htm

http://www.bgsoflex.com/intakeln.html

http://www.engr.colostate.edu/~allan/fluids/page4/effarea/effarea.html

http://users.erols.com/srweiss/calchpaf.htm

http://users.erols.com/srweiss/calcpchg.htm

Index = (.300 * 4) + (.400 * 2) + (.500 / 7)
Flow Index = (flow @ * 4) + (flow@ * 2) +( flow@ / 7)
Potential HP based on Airflow (Hot Rod, Jun '99, p74):
Airflow at 28" of water x 0.257 x number of cylinders = potential HP
or required airflow based on HP:
HP / 0.257 / cylinders = required airflow (see below)

"Flow Index" refers to a formula Jody helped devise to compare driveability between the different cylinder heads. The formula is:
(cfm at .300 lift x 4) + (cfm at .400 lift x 2) + cfm at .500 lift


p88) Determining peak HP rpm based on peak head flow numbers. These numbers are based on flow measured at a 28" depression.
The formula is: (flow in cfm / 1.68 * 2000) / (Displacement ci / number of cylinders) = rpm.
(flow in cfm / 1.68 * 2000) / (350 ci / 8 cylinders) = rpm
(flow in cfm / 1.68 * 2000) / (43.75) = rpm


HP (engine)
Airflow (per intake port)

300hp
146 cfm

350 hp
170 cfm

400 hp
195 cfm

450 hp
219 cfm
 
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I apologize for the lack of focus of my question. You post alot of good date there, that I will surely sort through. However to answer your question first.

I am looking at scans of my car and in particular looking at air flow numbers which I believe to be recorded from the MAF sensor. It is recording values in grams/sec.

Now what I see in some tuning tables is 255 grams/sec which I believe to be the maximum amount of steps the maf could possibly read. This occurs on some graphs at 6k rpm's. I however am recording now where near that.

At 5500 RPM's I am seeing numbers around 206 grams/sec. I have since descreened my maf, so I dont know if things have changed, or however if the maf is somehow acting up.
 

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