Over Driving Blowers

[tmdry]

Is it true that blowers can do more than what the specs says?

I've seen guys talking about running the blower faster than what the motor is running, if the motor is running @ 3600 rpms, the blower would run at 4100 rpms. The setup would be driven by belt driven pulleys, a larger one for the motor and a smaller one for blower.

Inputs.

 

[Lee Stockwell]

Sure, within reason. Each blower has a cubic inch capacity per revolution (cfr) and CFM will be directly related to RPM.

 

[steve g]

3600 rpm is pretty darn high for an engine, most air cooled are around 3grand, I would think one could go up to 10% over driven. I think its a pretty easy change just change out the pulley. get one that fits the same sheave I think is what its called. when my 18hp briggs finally takes a dump I think I may see about getting a 21 or 22 hp briggs as they are the same size externally I think, and look at overdriving my blower.

 

[Duane Oxley]

15%

Did it on more systems than I can count.

Engines under load typically drop about 150 RPM if they're closely matched for the blower and pump load. So, if yours is set for 3,400 RPM, you'll get about 3,150. Overdriving the blower by 15%, therefore, isn't as much of a jump in terms of expected load as you might think.

At 3,150 RPM, the blower would be turning 3,622.5 RPM

At 3450 RPM (assuming that yours is REALLY running 3,600 until under load, then dropping 150 RPM), would result in 3967.5 RPM

The above won't make much difference if your system is choked- down in the inlet and or exhaust of the blower, BTW. Because a net gain in CFM would also result in a net gain in back- pressure or inlet restriction... or both.

 

[Ron Werner]

make sure the engine has the hp for it. It may overdrive the blower but when that load starts, the power may not be there to keep up that performance.
Some times underdriving may be more beneficial. When you get a load on it the engine can work right on through it maintaining rpms.

 

[Newman]

make sure the engine has the hp for it. It may overdrive the blower but when that load starts, the power may not be there to keep up that performance.
Some times underdriving may be more beneficial. When you get a load on it the engine can work right on through it maintaining rpms.

and the whole setup will last longer.

 

[bob vawter]

should you really be running one of those small motors at close to 100% capacity......


NO!

 

[Lee Stockwell]

Bob you obviously have no experience with them, (and a vested interest otherwise), in practice they work best wide open to get optimal cooling.

25 hp Kohler is a bit north of 1500 bux and is good for at least 3000 hours. 50 cents and a gallon of gas per hour is pretty cheap.

 

[bob vawter]

Bob you obviously have no experience with them, (and a vested interest otherwise), in practice they work best wide open to get optimal cooling.

25 hp Kohler is a bit north of 1500 bux and is good for at least 3000 hours. 50 cents and a gallon of gas per hour is pretty cheap.

never owned one cuz iv'e seen a ton of worn out and blow-by ridden engines that people get rid of to buy my units.........
i can build a PTO that uses .8 gal/working hr

 

[Burtz]

.08 i think your full of shit old man

 

[Lee Stockwell]

Mounted in a pinto.

 

[Bjorn]

more like a Yugo

answer me this

if your get 15 miles per gallon

and you drive it 60 miles you use 4 gallons of gas

how can you only burn a pint of gas from carpet cleaning for one hour

 

[Nate The Great]

more like a Yugo

answer me this

if your get 15 miles per gallon

and you drive it 60 miles you use 4 gallons of gas

how can you only burn a pint of gas from carpet cleaning for one hour

Answer: Wheelchair is on the oxygen hose again.... shiteatinggrin

 

[bob vawter]

.08 i think your full of shit old man

well old Betsy was parted out about a year ago......that's the one that we "special constucted"....and de-brained a 90 window van
and put in a small 302 wit a small boat carb which we de-jetted down....i only spun it at 1600...it had a chevy distributor wit HE spark....
and YES it did work hard for .8gal/working hr

you guys have no idea WTF yor dealing wit here......do you?

 

[Nate The Great]

.08 i think your full of shit old man

well old Betsy was parted out about a year ago......that's the one that we "special constucted"....and de-brained a 90 window van
and put in a small 302 wit a small boat carb which we de-jetted down....i only spun it at 1600...it had a chevy distributor wit HE spark....
and YES it did work hard for .8gal/working hr

you guys have no idea WTF yor dealing wit here......do you?

Old Coot?!? Luv ya Bawbby!

 

[Bjorn]

he does drugs really really GOOD DRUGS

 

[Lee Stockwell]

Nitroglycerin and viagra

 

[bob vawter]

we put THREE sets of rivited on quarter panels on that van and you couldn't even tell!!!
someone tell these rookies

 

[idreadnought]

he direct drove a blower and spun it at 1600 rpm. not much cfm, but very fuel efficient.

 

[Bjorn]

I think
Bane turns one that fast

 

[bob vawter]

NO not the blower stups....the van motor....i stepped the blower up a tad...i think Jimbo figgered about 1900???

 

[Bjorn]

you need to prove it boob when your not high

08 an hour hahaha with a V8 1979 new church van

 

[bob vawter]

it was a 90........we completly stripped all the wiring out when we pulled the motor

 

[bob vawter]

you need to prove it boob when your not high

08 an hour hahaha with a V8 1979 new church van

which room were YOU in ODIN?

 

[Bjorn]

maybe more like 1.8 gallons an hour



wait I hear cops

FLUSH!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!1

 

[bob vawter]

it was DOGS you party guy!

 

[AshleyMckendree]

7.3 Diesel Direct drive burning 0.5 gal/hr ... STOCK.

 

[tmdry]

You thread jackers!

 

[Loren Egland]

Bob you obviously have no experience with them, (and a vested interest otherwise), in practice they work best wide open to get optimal cooling.

25 hp Kohler is a bit north of 1500 bux and is good for at least 3000 hours. 50 cents and a gallon of gas per hour is pretty cheap.

My son in law has 7600 hours on his 25 hp Kohler. It is in a Powermatic, and it does have the simple engine oil cooler that may make a difference in life expectancy? Anyway, I think the model used in the Powermatic is about $2000 now days.

 

[idreadnought]

Even at 1900 rpm your machine is only producing 200 cfm, Very similar to a 3.6 blower being run off of a 16hp engine running at 3200 rpm. I love to look of your machines, and I love the simplicity, heck Bob, I even like the price you sell them for. But in reality I need more vacuum than 200 cfm. Overdrive the thing, get it up to 400 cfm and I will be a customer for sure.