I am not sure if this is exactly the right area to discuss the use of a Blower but if it is I had a few questions. First is all it does is increase the flat compressed air ratio in the engine? And second what are the odds of finding a blower suitable for a 305 based engine.

 

I am not sure what you mean by "flat compressed air ratio."

Finding a suitable supercharger for a 305 is pretty easy, you have a lot of options. The simplest to install is probably something like a B&M roots blower, it's not much more than installing an intake manifold. Then you start delving into things like centrifugal type blowers that are more efficient, but will probably require more effort to get going to full potential.

 

Ah well I was thinking a blower just added more compression to the engine in form of more air compression. I don't know though. Still new obviously.

 

Go get a copy of a book called maximum boost by corky bell. I realize you're wanting to play with superchargers but a turbo is a supercharger and how it effects an engine is very similar except the way they get their power. The compressor is very similar to a centrifugal supercharger.

The difference has to do with cylinder pressures. The pressure is what lets you figure out your torque, but pressure is not linear. it is a lot closer to a sine wave. You have a peak pressure then you have a curve besides that. What a turbocharger or supercharger does is increase this peak magnitude slightly (increase it too much and you end up with preignition) and increases the area significantly. This is why you are able to make X power with X displacement on a certain fuel without spinning the motor insanely high RPMs.

 

Oh ok that makes a lot more sense thanks a lot man. So if it were to be dyno tested it would curve its way back up to a peak kind of? What they do is very slightly make the peak jump higher but they make the other part the curve have a far greater curve to it?