How would the two compare?

Lets say you are building a 6.4 hemi, and you have the choice to set it up like a Hellcat or go N/A and get the same amount of steam from it.

Will one engine be more fun to drive? Will the both be nuts?

If the make the same power, what would you choose and why.

68, B-body, street/ w/ little strip

If they both make the same power, I would take the one that made the most torque at the given torque/HP curve I desired.

700 blown, can be done with a very mild engine that would live longer, and yes, it will have much more torque, so you can run a taller gear.

I'd take the blown one, it would be MUCH more street friendly.Dave

My head says the blown motor will have more torque, a milder idle and properly tuned, be more street friendly. My heart says nothing sounds as good as a high compression engine with a lopey idle, and that anything else sounds boring.

I agree, while I like the blown or turbo better power wise, nothing sounds like a nasty motor with a big lopey lope cam. But a blower motor with extreme blower surge at idle is pure sex also

On paper they should be equally as quick, but realistically the blower motor would get there easier and would be a lot more fun to drive. I also think the blower motor would be quicker with a not so ideal set up (who ever has a perfectly dialed in set up). I'd go forced induction

Thank you guys for the help, believe it or not this is a high school shop class project, you might have read about it in Chrysler Power. We have a chance to build a supercharged engine and it will be a first for us.

Picture this: 6.4 " Hellcat esque" blown motor, caged, General Lee fresh off the rotisserie.

Think Galen would certify that as a 1 of 1 lol.

I'd wager the blower would be faster, but i'd go N/A personally. A 700HP Hemi is just a stock pull-out these days (ever thought you'd hear anyone say that?). What fun is that? Build a 700HP N/A hemi and they'll hear you coming. Yeah man... ragged...

The blower motor should have a flatter torque curve and hold more torque longer so it would have an performance advantage in the real world. Is budget an issue? The blower stuff will take more coin than the N/A.

Wow, sounds like more fun than the high school shop project we did.We got to put a shortblock in a Vega .Times sure have changed.

I agree cos we've all seen too many slower than they should be blower motors and a FEW fast n/a cars.........

I would think of how much added strain driving the blower makes on the motor, compressing air driven off the crankshaft takes HP and adds strain on every part of the motor, before making the final decesion. As far as turbos I've been told that( by racers who use them) they do add additional concerns off the back side of the motor so I guess there are no free lunches. Adding boost into a motor definetily makes more power easier per C.I. than N/A motor do.

Boosted will be milder for sure at the same power... but there is something to be said about the nasty intimidating sound of a 700hp motor.

My Dad's NSS A/FX car (9.25) isn't that much faster then mine at 9.88. But his 572" 14:1 motor scares the hell out of me just to start up in the car. My turbo motor is so lame sounding compared to it... lol

Lopey?
https://www.youtube.com/watch?v=ojnNWlEgJfM

And as we all know, that rilly kewl sound is why we build motors...

It can take 100+ extra horsepower to drive a supercharger even on a mild 600-700hp street engine, so the entire rotating assembly is going to see additional stress from the cylinder pressures over an n/a motor. However, for the same displacement the n/a motor would have to spin at higher rpm, which requires more expensive valvetrain components.

Both are cool. I like torque so I prefer big blocks, or supercharged/turbocharged smaller displacement engines.

Chevy i know... but anytime we get into YT dyno wars i always come back to this one... Pretty close to 700HP N/A too, at the crank anyways. 562RWHP.

You want LOPE...???


https://www.youtube.com/watch?v=WNnSs_oN704&spfreload=10

That wasn't a Shivvy, that was a Ram with a 420" Gen III Hemi.

Cranks see maximum stress near TDC. Because boosted motors run less timing, the cranks actually see a lot less stress vs. a N/A motor.