TRANSAM38387

i have been doing alot of reading on this little blower, and had a few questions that i can't seem to find using the surch button. with a mild cam what is the maximum boost will this blower will make on a 355 with a good mild blower cam, and good aftermarket heads. also would a 383 make more power at less boost with this blower than the 355 with more boost. right now i can go eithier way.i wanted to use the 177 on a 383 but i don't think i can get it to fit under a 4 inch cowel hood, from what i found doing a search. i really would like the 383 with a 177 blower if anyone knows how to keep it all under the hood. i'm open to all and any help and suggestions. thanks for your help

jocww

boost depends on the pulley size also why not crank the boost on the 383
Jon

Damon

Just a point of reference for you since there's a ton of variables..... on my 383 with AFR heads and a mild 214/224* duration, 112*LSA cam I get about 6 PSI of boost out of the 142 using the largest 7" bottom pulley and stock 3.07" top pulley. There's only one higher pulley left I could go to (2.85" top pulley) and that would be all she wrote.

Think about it like this- the little 142 is about maxed-out around 500 HP. It just can't move enough air to get much beyond that.

Smaller displacement engine = higher boost
Smaller cam = higher boost

Just remember that boost is what piles up in the intake when the the engine just can't swallow all the air the blower is shoving into it. Like with all engines, AIRFLOW is still what matters for making power. Boost is the by-product of trying to shove 10 pounds of stuff into a 5 pound bag. How well the engine breathes (heads, cam, intake, exhaust) is still just as important in a boosted motor as it is in a N/A setup.

TRANSAM38387

thanks damon. if you had to do it all over again would you go with the roots blower again or would you go with a centrifugal.
i'm really torn between the bottom end torque of the roots and the high hp that the centrifugal can make. right now i can go eathier way with the motor because it is going to be built for a blower, (forged crank,rods,and pistons). i know the centrifugal is more (procharger) but that only means waiting a few or months to buy the blower. i'm just trying to do all the resurch before i buy so later down the road i don't say i wish i would have done........

Damon

I am actually on my 3rd itteration of this engine and I'm zeroing in on what works and what doesn't. End of the day, you'll go faster with a centrifugal, in my opinion. But it will cost more, be more difficult to tune and it doesn't look anywhere near as cool under the hood (although it will fit under a stock hood while even the little 142 will not). Plus the roots blower sounds damned cool when you lay into it. zzzzzzZZZZZZZ!!!! Nothing like the whistle of a centrifugal.

TRANSAM38387

is the 142 that loud that others can hear it. the only blower i ever hear coming down the road (besides my friends dads pro street corvette with a 6-71) was a 04 cobra, and i could hear him coming from behind me with my windows up. i have always like the way the cobras blower sounded under hard accelaration.if the 142 is that loud that would be cool

Damon

Mine's just about dead silent until you lay it wide open. Then you hear the weird sound of 2 blower rotors ripping the air into little bite-sized pieces and shoving them down the engine's throat. zzzzzzZZZZZZZ! Loud enough to be clearly heard over 2 chamber Flowmasters. But people I have raced say they didn't hear it outside the car as I rolled past them.