Engine calculations

[doublepostwhore]

I am looking for some formulas to calculate CFM's and then convert it to meters^3/second

Basically I am trying to calculate the rate at which volume of air going into each cylinder is increasing as well as the actual volume as an engine goes through its RPM band from 2K to 8.5K with full boost being made @ 5K boost being 15 PSi.

Trying to model it around B20C but if someone has this already calculated w/ formulas for a B18C5/C1/B that would be prime!!

Thanks, Maybe even links to some/all of this would be good.

My calculas is alright, so if any of you guys already have numbers w/ differentiation, and/or derived formulas, I can work with that too.

Looking for rage2 and Primer_Drift!!!

-Adam

[boy1_]

1 cubic foot = 0.0283168466 cubic meters
1 minutes = 60 seconds
1 cubic ft./min = 4.72 x 10^-4 m^3/s

[FiveFreshFish]

1 CFM = 0.0004719474 m³/s

or

1 m³/s = 2118.88 CFM



Get this units converter and use the "Flow" tab.
http://www.joshmadison.com/software/convert/

[doublepostwhore]

CFM = (CID x RPM x VE) / (3456)

CFM is a function of RPM and VE as CID is constant.

So if full boost is achieved @ 5K then first and for most my TE has to be in the range of full boost between 4.7-5K. Volume increase is exponetial until 5K then after that I can assume VE to be peak % @ 5K or wastegate actuation point, then the volume change becomes direct increase until redline.

I have calculated for a B20 that max CFMS @ 18PSi and 8K to be 508.07 and baseline, stock zero boost pressure to be 245.77 CFM @ 8K so I am seeing an aprox. 60% VE increase over base line @ redline. VE of 135% @ 5K for boosted B20 over baseline, therefore between 5K and 8K I should see an increase of (508.07 - x) = (122 x 8000 x (135+x)) / (3456)


Anyone care to verify logic/calculations?