Big Inch Blower Motors

Is there a good reason nobody runs 600+ inch blower motors? I dont really buy into the "rod angle" or "too much stroke" theory either. If it was so bad then nitrous guys would be blowing them up every time the made a pass. Often wondered if it would work. Thoughts?

 

My thoughts on that is what's the point. If you are running top sportsman or dragster you don't need a crazy huge motor spinning a big blower cause 6.0 is all you can do. Unless you are headsup racing, but most classes have cid restrictions. That's just my .02 if I am out to lunch let me know

 

Hard to make boost with a big motor is about the only downfall

 

inches

Fast blown stuff turns 9000rpm plus. The piston speed is too high to have a long stroke.The borespace limits the bore size. AJPE has a bigger bore space hemi that could get the engines to 600 inches if anybody wanted to.
Some ADRL PX engines are 450 inches so obviously it doesn't mean a whole lot in a outlaw screw application.

 

Relavance

Piston speed is relevant to the stroke vs. RPM. You would surely have less boost with more cid but that wouldnt neccessarily be a bad thing. Right? Twin turbo guys started with small motors back in the day.....Now its normal to see 650+cid with turbos. The bigger the stroke/bore the more power per revolution with a good set of heads of course.

 

We are no means a max effort deal but we run a 4.5" X 4.5" 572" motor with an 8-71, I turn it 8200 most of the time.

Only makes 12-15psi boost but has been 7.99 @ 170 in a 3250lb car, I dont think we are doing to bad.

I'd really like to see what the motor could do with some more air but the car has a hard time holding what we have now.

 

this may blow back on me.....

I've understood that there is more power in the efficiency of the blower than the increase in cubic inches. Point being the blower fills a smaller inch motor (more boost) than a large hole to fill. I buy into this thinking that boost is compression and compression is power.... I'm interested to know if this concept "holds water". Thank you.

 

Interesting point. If high boost increases cylinder pressure then could that same cylinder pressure be made up with higher static cylinder pressure under lower boost levels? Also, a longer stroke should have a better shot at building cylinder pressure than a shorter one.