Effective compression ratio...up the compression with boost

[bcjammerx]

A continuation of this thread I made
http://www.cb7tuner.com/vbb/showthread.php?t=138665

-cliff notes...I asked for a chart/graph/formula that would show how much the compression ratio would increase as boost was applied...boost being the only variable. KTown_Whiteboy gave some formulas...but I found some kick ass web sites that take the calculating out of my head and onto a web site...plus I found a pictorial graph.

This site that was posted
http://www.zealautowerks.com/hfseries.html
in a thread is what got me thinking.

change the boost...and compression ratio goes up...so I saw that and knew I wasn't nuts.

I didn't know the correct terms. Effective compression ratio is the term I was looking for. So once I found that the search was easy.

I will add...this isn't definitive...it's not exact...but it'll give you an idea...though some of the calculations should be pretty good...especially since I'm not doing them on paper

Here is another example
http://www.autocomponenti.com/booste...osted_tech.htm



some calculators
http://www.rbracing-rsr.com/compression.htm
http://www.smokemup.com/auto_math/eff_cr.php

site with math formulas...even better
http://www.motorsportsdigest.com/tech/forced2.htm

There was also a question about altitude and power loss...some of those sites allow for elevation to be put in (longview texas is 371 feet above sea level) it doesn't show power loss/gain...but it'll show a change in effective compression ratio. Coursea

[bcjammerx]

*bump cause I forgot I posted this...and I found it interesting...and I'm bored...not my engine...my brain

[HondaFan81]

Other terminology is static compression versus dynamic compression (effective compression). This concept applies to all motors (i.e. NA, forced induction, etc). NA camshafts play a role in dynamic compression differences as well.