671 vs 871 blowers...

[1974dodgecharger]

Minus the size what is the main advantage or differences if the prices are the same brand new?

My friend has a 871 blower kit for a 440 in box he thought he was gonna use, but decided not too.

[John_Kunkel]

You can turn the 8-71 slower and get the same amount of air as the 6-71 turning faster.

[1974dodgecharger]

You can turn the 8-71 slower and get the same amount of air as the 6-71 turning faster.

so that means less heat...which in turn is good.  I was reading somewhere 871 is more for fuel injected, but at the same price I would rather pick up the 871 then.

[Chryco Psycho]

Makes sense to me , the 6/71, 8/71, 10/71 is the rotor & case length , at a given RPM you start to create more turbulence than pressure so turning the blower slower with longer rotors makes the blower more efficient & cooler .
PSI / screw blowers are better yet over the roots type as the pressure under the rotors cannot put pressure on the rotors trying to turn them backwards

[metalstorm440]

The bigger blower is useualy the better choice.check the rotor to case clearence,rotor to rotor with a feeler gauge.[.010/.015 in general]And let me say the carbs size you pick will make a huge difference also.

[1974dodgecharger]

Whats idea price or fair price for a 671 or 871 for daily driver status blower?

[Chryco Psycho]

new 4k , used 1/2 that but it depends what you get with it , just the blower is not all that expensive but you need the crank hub , drive pullies , belts , idler pully & brackets , intake , carbs , fuel lines & throttle brackets & linkage

[metalstorm440]

You can save some $ by going through a dealer and not direct from a blower Co. like BDS or The Blower Shop or a used dealer like RBS or Good vibrations to name a few.I have not looked at pricing so i cant realy give an idea but if you want me to guess i can.

[1974dodgecharger]

You can save some $ by going through a dealer and not direct from a blower Co. like BDS or The Blower Shop or a used dealer like RBS or Good vibrations to name a few.I have not looked at pricing so i cant realy give an idea but if you want me to guess i can.

well I been talking to superchargerusa.com the person who has been emailing me has been very helpful. I want it anodized black also and they can do that for 700 bucks extra the whol setup kit.  If you think I could get it cheaper than what they quote on their website give me a PM.

seems to me though after reading and googling for many weeks now a 671 will be fine and a 871 is better, but not truely needed unless I want 900hp plus of HP and that will require more money on the engine itself.

[surmanajaja]

if you want 900hp I would not use and old-school blower at all. turbo is way easier and cheaper to make real power and screw-style is cooler and fits under the hood.

anyway for a driver 6/71 is enough, but bigger looks better so go with 8/71 if you can.

[Ghoste]

But a turbo doesn't give you that cool blower whine and the screw type doesn't give you the cool look of it poking out of the hood.  Some old school things are good. 

[Cooter]

Centrifugal Superchargers also offer intercoolers. Kinda hard to get an intercooler between the intake and blower with an 8 71.

Water/methanol injection is nice, but gimme something that actually does produce what it appear to produce, without the engine damage.

[Ghoste]

Performance mods without the risk of engine damage?  Thats a short pile.

[Cooter]

Performance mods without the risk of engine damage?  Thats a short pile.

Wow Ghoste, you on your game today taking things out of context and jumping right on the bandwagon. That has to be some kinda record. Even for you.

[Ghoste]

It was meant to be humorous but to be truthful, I had absolutely no idea whatsoever that I was even slightly taking it out of context.  Ordinarily I guess I would plead for an explanation but since it wasn't meant as a point of debate I'm not that worried about it.  You have my deepest apologies for both not understanding what you meant and for making what is now obviously a bad joke of it.

[1974dodgecharger]

if you want 900hp I would not use and old-school blower at all. turbo is way easier and cheaper to make real power and screw-style is cooler and fits under the hood.

anyway for a driver 6/71 is enough, but bigger looks better so go with 8/71 if you can.

there is a 400 dollar difference between the 671 vs 871 setup. I figure the 400 dollars I can save to get it anodized black so 671 will do then I need some money for a cam change among other things for the blower setup. 

[Chryco Psycho]

personally I would spent the $400

[surmanajaja]

But a turbo doesn't give you that cool blower whine and the screw type doesn't give you the cool look of it poking out of the hood.  Some old school things are good. 

yes I agree and thats why I said also "bigger is better". I have loved the sound of blower ever since watching Mad Max, and would definitely put one on my car too.

[Challenger340]

871 case advantages to boost vrs rpm are a plus....
my question I guess...relates more to targeted power levels and Boost you are seeking ?
What are you planning ?

[1974dodgecharger]

871 case advantages to boost vrs rpm are a plus....
my question I guess...relates more to targeted power levels and Boost you are seeking ?
What are you planning ?

Im looking for streetability with the looks being more important than the actual performance. I be happy with 500hp with the blower setup. No racing whatsoever, but I do plan on rev engines at stop lights 

[metalstorm440]

You could go with a single big carb and still have all that you want.

[Ghoste]

But he also wants the visual wow factor and some blower whine.

[Cooter]

Im looking for streetability with the looks being more important than the actual performance. I be happy with 500hp with the blower setup. No racing whatsoever, but I do plan on rev engines at stop lights  

This is what leads to engine getting grenaded IMO. Sure 500 Hp blown 440 sounds nice till all that 10 second look gets your ass handed to you by a Turbo'd Nissan 240, then you wanna turn up the wick, then BOOM! "No racing whatsoever"? Nice try..Nobody spens $4K on a blower and just "Cruises it"......

[1974dodgecharger]

 

I still want the whine and 'look' of the blower 

Im looking for streetability with the looks being more important than the actual performance. I be happy with 500hp with the blower setup. No racing whatsoever, but I do plan on rev engines at stop lights  

This is what leads to engine getting grenaded IMO. Sure 500 Hp blown 440 sounds nice till all that 10 second look gets your ass handed to you by a Turbo'd Nissan 240, then you wanna turn up the wick, then BOOM! "No racing whatsoever"? Nice try..Nobody spens $4K on a blower and just "Cruises it"......

[Cooter]

Not much for the  "Vin Diesel" look myself..Cost that much, it better haul ass and prove it to me IMO.