Maybe retarded, but why are the gms/cyl so low,high HP car?
10-01-2003, 12:55 AM
#1
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Maybe retarded, but why are the gms/cyl so low,high HP car? I'm a little confused. Why is the calculation of the gms/cyl pretty close to the same on my friend 5.3 truck, my car, and my other friends TR230 Z06? They all go to mid .60's on the gms/cyl calculation I have in EFI live (MAF*15)/RPM. Does not make a whole lot of sense? Why does the table even go up that high?
As a side question, how does the MAF gms/second correspond to horspower, or is there a relation? I'd heard a while back that each gm/sec was about 1 rwhp, but that does not seem true at all as my friend's Z06 only pulls 310ish according to EFI Live and mine's high 200's.
Any help is appreciated. Thanks.
As a side question, how does the MAF gms/second correspond to horspower, or is there a relation? I'd heard a while back that each gm/sec was about 1 rwhp, but that does not seem true at all as my friend's Z06 only pulls 310ish according to EFI Live and mine's high 200's.
Any help is appreciated. Thanks.
10-05-2003, 08:32 PM
#3
Re: Maybe retarded, but why are the gms/cyl so low,high HP car?
Help please?
1. 5.7 and 5.8 Liter engines have nearly the same cylinder volume.
5800cc=5.8 liter, 5800cc/8= 725cc/cyl
5700cc/8= 712.5 cc/cyl
So with 8 cylinders we have 725 and 712.5 ccs for 5.8L and 5.7L respectively.
2.At standard temp and pressure (101.3 kPa)atmospheric air has 1.29 grams per liter ( or 1000cc).
3. 725cc/cyl * 1.29 grams/1000cc = 0.935g/cyl
4. 712.5cc/cyl * 1.29 grams/1000cc = 0.919g/cyl.
So at WOT(101.3 kPa) the engine is filling each cylinder with a little more than 0.9 grams of air. As the RPM increases the the total airflow, of course, increases ( per unit time).
I hope this helps. If anyone cares to add or correct ...please do
joel
