Blowers, lets talk about them

[whiteworks]

I think I want something with a blower on it, not sure what but something. I'm thinking a street rod of sorts. What would your ideal blown engine be? Here are some pics from Mooneyham Blowers, pretty sure watching all these blower builds is kindling the fire LOL

 

[whiteworks]

 

[whiteworks]

:thumbsup

 

[420HOA]

Don't drink the kool-aid, sorry to late !

 

[Luvnlife]

With lot's of blower surge, right River Dave:thumbsup

 

[stokerwhore]

here's a nice little set up for yuh. i like the little pulley.

or if size is your thing..

 

[Guest]

Go large!....

 

[stokerwhore]

:bowdown:













...if i remember right they got it to start and idle and then they tapped the gas pedal and stretched the heads off,lol.

 

[Riverbound]

Hemi :thumbsup

 

[ChiliPepperGarage]

Nothing like a blower motor in a hot rod. This car was always a blast to drive.

 

[ChiliPepperGarage]

I have this one now with a B&M mini-blower. It's a fun car too but doesn't have the impact of the '34 with the 6-71.

 

[Flyinbowtie]

Blowers are cool. You need a hot rod, WW.

 

[whiteworks]

Obviously there are lots of different size blowers, whats the difference? can they all be put on the same size engine for different results?

Yeah I know I can sit there in Mooneyham and shoot the shit about this with the guru's but I think this will be an interesting and educational thread.

 

[GRADS2009]

I now know after last night that my wife is not one.:grumble:

 

[Guest]

Obviously there are lots of different size blowers, whats the difference? can they all be put on the same size engine for different results?

Yeah I know I can sit there in Mooneyham and shoot the shit about this with the guru's but I think this will be an interesting and educational thread.

Somewhere in this thread, it will be revealed that Tom Brown dated Dustin Whipple's sister..:thumbsup

 

[Riverbound]

I could see you rolling in this :thumbsup

 

[ChiliPepperGarage]

Obviously there are lots of different size blowers, whats the difference? can they all be put on the same size engine for different results?

Yeah I know I can sit there in Mooneyham and shoot the shit about this with the guru's but I think this will be an interesting and educational thread.

I'm not an expert but this is what I know (or think I know!) :

There are your basic Roots type blower that was derived from the Detroit diesel (4-71, 6-71, 8-71, etc). This is the most common and was used on hot rods and drag cars for years. Inside are two spiraled impellers that compress the air. It looks kind of like a meat grinder.

The newer screw type superchargers like a Whipple, are more efficient and have impellers shaped like an auger. They push air out one side.

Centrifugal blowers are more like a turbo only instead of being powered by exhaust they are driven by a belt.

I am a more traditional hot rod guy so I use roots blowers. I just think the look is much more suited for hot rods.

They can be mounted to just about any engine. Just need a manifold and pulley set up. You adjust boost by pulley size.

 

[Guest]

Blower>>>>>>Good!................









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[Riverbound]

Obviously there are lots of different size blowers, whats the difference? can they all be put on the same size engine for different results?

Yeah I know I can sit there in Mooneyham and shoot the shit about this with the guru's but I think this will be an interesting and educational thread.

BLOWERS AND THE NUMBERING SYSTEM.

Most of our website fans and followers are familiar with the term ?Blower? (supercharger) on an engine. But have you ever questioned where the numbering system came from? 4-71, 6-71, 8-71, 12-71, 14-71, 18-71? This blower thing goes way back to 1885 when Gottlieb Daimler got a patent on the thing and it probably goes back even further but he?s the one who finally received the original patent and then it goes from there. Several different types and styles have come along since and constant improvements are being made even today.

There are centrifugal blowers (from the word centrifuge) which are somewhat of a bowl shaped aluminum housing usually sitting above the engine (but not necessarily) with a grooved circular plate revolving around a center shaft. It is generally gear driven off of the cam gear, crank shaft or other means of a positive drive. Air is usually ducted into the intake manifold or directly into the carburetor or fuel injector.

Then there is the ?turbo? charger (from the word, turbine). Similar in appearance to the centrifugal, the turbo charger is driven off of exhaust pressure and has no mechanical connection to the engine. As exhaust gas exits the engine it first travels through the vanes of the turbo charger and creates ?boost? in the incoming air to the carburetor or fuel injector, sometimes referred to as ?free air?, ?free boost? or ?free horsepower?.

The numbering system mentioned earlier is strictly for the ?roots? type blowers used on most supercharged racing engines. It is the big aluminum ?thing? sitting on top of a racing engine with either carburetors or fuel injection bolted to the top of it. On street rods it?s usually polished or chrome plated. Briefly, it is belt driven off of the crankshaft and has two counter-rotating helical shaped rotors (or ?screws?) inside that increase the volume of air to the engine. Thus, you are able to add more fuel. More air, more fuel, more horsepower. If you ask an owner or read about an engine having a 6-71 or 8-71 blower and wonder, ?what in the world are they talking about??, here it is:

The Roots type blower numbering system of today originated from the 2 cycle, GM series diesel engines. The engine design requires the blower to blow fresh air in as the piston is coming up and blow it out as it goes down. A series of oblong holes towards the bottom of the cylinder lets the blower blow the exhaust gas out as the piston passes these slots and blow a fresh charge of air in as it comes up and is ready to fire again, every stroke is a power stroke, thus the 2 cycle, only a different concept.


A 4-71 GM Diesel has 4 cylinders and 71 cubic inches per cylinder, thus the size of the engine is 4 x 71 or 284 cu in. The blower would be a 4-71 blower. 6, 8, and 12 cylinder GM 2 cycle diesels are 6-71, 8-71 and 12-71. The aftermarket has seen fit to continue the numbering on up to 18-71 but there are no 18-71 GM Diesels.

Some enterprising racer of the day took the blower off of a GM 2 cycle and strapped it on an engine and wa-lah! ? a blown racing engine and the beginning of an era for sure. As a note, back in ?58, the Bender and Hier Lee?s Speed Shop small block Chevy dragster had one of the first Potvin ?crank-drive? blowers (mounted in front and driven off of the crankshaft) and set two Chevy ?firsts?, both an elapsed time and speed record at the old Lions drag strip in Long Beach, CA.

 

[Riverbound]

 

[RUNNINHOTRACING163.1]

Obviously there are lots of different size blowers, whats the difference? can they all be put on the same size engine for different results?

Yeah I know I can sit there in Mooneyham and shoot the shit about this with the guru's but I think this will be an interesting and educational thread.

thought there was only 1 and its a PSI 206 B :thumbsup
carry on ...



ROCK ON !!!!!!!!!!!!!!!
ITS A SKATER NATION !!!!!!!!!!!!!!!!!!!!!!!!!!!!!:drnkfr

 

[stokerwhore]

screrw type (psi,whipple) are the only true compressors. roots type blow air into the manifold where it backs up against the valves then builds presure on both sides of the intercooler. that is why they are less efficient and screw compressors which compress the air inside itself before being released into the manifold and put acrooss/through the intercooler. the bigger the blower the more power it will rob to turn it. you size it according to maximum gain over loss.:blah::blah::blah:

 

[stokerwhore]

thought there was only 1 and its a PSI 206 B :thumbsup
carry on ...



ROCK ON !!!!!!!!!!!!!!!
ITS A SKATER NATION !!!!!!!!!!!!!!!!!!!!!!!!!!!!!:drnkfr

wtf? ....ok, i'll go with thatuttahere:

 

[Ace]

I would drop all the blower housing and lobes to Gene 20 plus years ago. My dad owned a machine shop in LA, specializing in Diesel. Here is a new hot rod project pops is working on now, check it.

 

[River Dirt 2]

These.

 

[JMC]

Good info on Screw type vs Roots type blowers here.

http://www.kennebell.net/techinfo/general-info/twinscrew-vs-roots-fromcatalog.pdf

 

[tony]

These.

That room looks like it could be located in Pasadena?

 

[RUNNINHOTRACING163.1]

Nothing like a blower motor in a hot rod. This car was always a blast to drive.

:thumbsup







ROCK ON !!!!!!!!!!!!!!!
ITS A SKATER NATION !!!!!!!!!!!!!!!!!!!!!!!!!!!!!:drnkfr

 

[River Dirt 2]

That room looks like it could be located in Pasadena?

Exactly

 

[rivergames]

Throw a 1471 on the WW Work Van! :thumbsup

 

[callbob]

Blower>>>>>>Good!................

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I seem to remember some "after" pics.:grumble:

 

[Guest]

I seem to remember some "after" pics.:grumble:

The after, after pics include a brand new 8:71 TBS blower and 2 brand new AED 950 carbs...


If you are gonna play.....every so often you gotta pay.....It comes under the "Boating is fun" bylaws...

 

[overpriced hallet]

These.

Not sure if most guys realize the power these things make

 

[Baja Big Dog]

One good thing is that if you overdrive it and cause some blower surge, their some experts here that can tune that out for you....

 

[rivermobster]

Nothing like a blower motor in a hot rod. This car was always a blast to drive.

Absolutely beautiful car. :thumbsup

Drop by JMS when you get a chance, there is a complete package for sale in the showroom right now...

 

[Riverbound]

Absolutely beautiful car. :thumbsup

Drop by JMS when you get a chance, there is a complete package for sale in the showroom right now...

Jms built the motor for my spectra. I was completely satisfied with them.

 

[BMABITY]

Absolutely beautiful car. :thumbsup

Drop by JMS when you get a chance, there is a complete package for sale in the showroom right now...

Yep, I've worked with mike on many projects. Great guy with some serious knowledge on building engines, he will get you the power...

 

[whiteworks]

Well this thread is growing some legs, good info so far.

What exactly does over driven mean?

How much horse power can a blower add?

 

[RiverDave]

One good thing is that if you overdrive it and cause some blower surge, their some experts here that can tune that out for you....

You are such an idiot..

RD

 

[stokerwhore]

is it blower surge or is it big cam lope that is the question.

the picture with the two motors? yes top shelf stuff. most wouldn't even want to know how much ONE of those cost,lol. i really like the valve covers though. some day i'll get rid of the stud girdles and go shaft mounted so i can run them.... and whgat the hell are they coated with?

 

[cave]

Super chargers can be fun. A lopy cam, high overdrive and the engine sounds like its alive and breathing.

Sent from caves humble DroidX

 

[OCMerrill]

What exactly does over driven mean?

How much horse power can a blower add?

The speed the blower turns relative to crank speed. Under is less than, over is more than. There are percentage charts from blower mfg. you can use to select different pulleys to obtain different ratios.

Don't have blower surge or RD will ban you.

How much power is tough to answer but your packing air into the cylinder making the engine "think" it's larger than it is.

 

[boatnam2]

Buy it big (1471) and turn it slow...kinda like cooking tri tip!

 

[whiteworks]

The speed the blower turns relative to crank speed. Under is less than, over is more than. There are percentage charts from blower mfg. you can use to select different pulleys to obtain different ratios.

Don't have blower surge or RD will ban you.

How much power is tough to answer but your packing air into the cylinder making the engine "think" it's larger than it is.

Got it:thumbsup

Buy it big (1471) and turn it slow...kinda like cooking tri tip!

Makes sense, I am assuming that you can turn a small blower fast for the same results?

 

[boatnam2]

Got it:thumbsup

Makes sense, I am assuming that you can turn a small blower fast for the same results?

Yea i guess you can, i only had a few blower motors and always had a 871 wanted a 1471 but too much work to put into boat i had at the time. I had a buddy who worked for littlefield blowers and he always told me to go big and turn it slow...something to do with heat, boost, compression, quench, exhaust temp etc etc shit if i wanted to know all that i would of worked in a blower shop.

 

[whiteworks]

Yea i guess you can, i only had a few blower motors and always had a 871 wanted a 1471 but too much work to put into boat i had at the time. I had a buddy who worked for littlefield blowers and he always told me to go big and turn it slow...something to do with heat, boost, compression, quench, exhaust temp etc etc shit if i wanted to know all that i would of worked in a blower shop.

gotcha, maybe Rick will chime in and school us on some blower basics?

 

[OCMerrill]

Got it:thumbsup

Makes sense, I am assuming that you can turn a small blower fast for the same results?

It's all part of how much power and where you want it to happen and what RPM range you want for the engine. This is where a good builder comes in or a bunch of research ahead of the build curve. Obviously in a boat a 2500 rpm idle speed is not going to cut it.


The larger the blower the more HP it takes to drive it.

 

[boatnam2]

lol ok.... The only thing i know for sure is there nothing better sounding then a crisp blower motor with a nice surge, hope to own one again someday if for nothing else just to hear it run.

 

[whiteworks]

It's all part of how much power and where you want it to happen and what RPM range you want for the engine. This is where a good builder comes in or a bunch of research ahead of the build curve. Obviously in a boat a 2500 rpm idle speed is not going to cut it.


The larger the blower the more HP it takes to drive it.

Lets throw a couple of senarios out there and see what the peanut gallery has to say.

21 schiada v drive, ideal blown engine setup?

67 Nova tubbed and tubed Ideal blown engine for low E.T's

And just for shits and giggles, a top fuel dragster so we can cover the extremes

Same engine for both estimated HP blown and non blown?

 

[rivermobster]

It's all part of how much power and where you want it to happen and what RPM range you want for the engine. This is where a good builder comes in or a bunch of research ahead of the build curve. Obviously in a boat a 2500 rpm idle speed is not going to cut it.


The larger the blower the more HP it takes to drive it.

Wise words. :thumbsup