[GoatRider]

Hey neighbor!

I think two major factors you need to input into your math are:

1- Base the "more air forced in" ratios on mass(lbs/min) rather than volume(cfm) which in turn forces you to take into consideration:
1(a) - Temperature, the compressed air will be hotter than the 14.7psi "atmosphere" air.

2- Volumetric Efficiency of the intake/head/valve timing/exhaust "package." I believe the general idea of 1.77 x atmospheres = 1132 lbs of "boost" only works if the VE of the engine is right around 100%.

I bet someone like Tom Vaught has the awesome Excel spreadsheet or other software that will do just what you want to know...

[Tom McQueen]

For this exercise Im mostly ignoring temp rise. Pick a temp. 90 degrees works for me. I do have the largest air to air intercooler Garrett makes, so hopefully that keeps the pressurized side temp close to ambient. It makes sense to use volume. Ill see how that computes.


Heres an observation Ive recently made. It has to do with compressing air and temp rise. I have been taking daily Hyperbaric Oxygen treatments (HBO2) for the last month. They seal me inside of an acrylic tube and run the pressure up 2 atmospheres. Then they pump 100% oxygen into the sealed tube. I then lay there for a couple of hours contemplating my naval and once the 2 hour time period is up, they de-pressurize and I come out. In the beginning, during the pressurizing stage, its warm. Not hot, but there is a very noticeable temp rise. And during de-pressurizing it gets pretty chilly. Ive always heard about the temp rise of compressing air. Never thought I would experience it first hand.

Found what I was looking for here;

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