Boost/Compression Ratio Calculator
http://rbracing-rsr.com/compression.htm
The link above is for a boost psi to compression ratio calculator. I ran a couple and was quite surprised at what I got!
1) A typical stock 6.5L
You are running 8 PSI of boost at an altitude of 1000 feet. Your motor's static compression is 21.2 :1. At this boost level and altitude your effective compression ratio is 32.54 :1, and without altitude correction your compression ratio would be 32.74 :1.
2) Reduced 18:1 CR and 15 PSI boost
You are running 15 PSI of boost at an altitude of 1000 feet. Your motor's static compression is 18 :1. At this boost level and altitude your effective compression ratio is 36.17 :1, and without altitude correction your compression ratio would be 36.37 :1.
Do these seem correct!? Can our 6.5s (or any diesel) handle this CR!? I was a bit shocked at the effective CR. I came upon this because I was wondering what is the effect of boost to CR. I knew it had to go up but, still I am very shocked.
Same dynamic CR, Same A/F density, More A/F Volume
more boost = more combustion O2 avilable. Add a corresponding amount of additional fuel and you have a more powerful combustion event. Even though the dynamic compression ratio remains the same +/- , the lower height of the 18-1 piston crown creates a larger effective combustion chamber volume, which is now packed with the same density of air/fuel as the smaller area that was provided by the stock piston compression height.
Same DCR + Same A/F Density+ more A/F Volume = bigger bang per power stroke
Ehtanol injection systems
Was just talking to a guy that says ethanol inj will have a dramatic impact on fuel economy. He claims it burns the fuel more completely producing more power. Anyone trying this, any truth to it?