Supercharger...

**Juzz976** · 13th August 2010, 18:17

Originally Posted by avgas

Another fun thing do to with old vacuum's is to remove the fan from it.
The motor then spins a full speed until it self destructs.
Screams like a mother.

It would still only run at its max speed for the supply frequency of 50Hz unless it was on a VSD.
All you've done is take the load off it and would drawng well below its nominal current, therefore the windings would not be heating up very much due to the low power output.
Must have been a freak short in your windings.

**bogan** · 13th August 2010, 18:25

Originally Posted by Juzz976

It would still only run at its max speed for the supply frequency of 50Hz unless it was on a VSD. or a dc motor, or a universal motor
All you've done is take the load off it and would drawng well below its nominal current, therefore the windings would not be heating up very much due to the low power output.
Must have been a freak short in your windings.

10 muthafyucking chars

**Paul in NZ** · 13th August 2010, 18:45

Originally Posted by onearmedbandit

Watch out Land Speed Record peoples, I'm buying 4 of them!

Then ya better upgrade yer battery as well......

**jonbuoy** · 13th August 2010, 18:50

Originally Posted by avgas

Like I said. Not exactly earth shattering performance. But essentially if you do it right what is the difference between and mechanical drive and an electric one.
But fuck paying $180 for that. Set of iridium's and a remap would give you much larger performance boosts.....easy.

But if your ever wondering what to do with an old hairdryer chassis and a grunty electric motor.......

Electric one would work but it would have to be a hefty motor to drive a roots or screw compressor - those pissy electric fans can´t push or compress air (which is what a super/turbo needs to do) Put your hand over the end of one theres nothing to push your hand away. Blades have no grip on the air. I´m not even sure it wouldn´t disrupt the airflow in the carburettor venturi in a bad way.

**Edbear** · 13th August 2010, 19:08

Originally Posted by onearmedbandit

Everything I've read suggests that ram-air has no effect at speeds of 100km/h. All to do with atmospheric pressure and other stuff I know nothing about. I dare say a hairdryer would do nothing to an engines performance. Well nothing positive.

I once hooked up the heater fan to the aircleaner on my Wolseley 6/80 and it did actually increase the idle speed a few rpm's...

Originally Posted by Crasherfromwayback

I'll tell ya what not to do with an electrical appliance...years ago a mate of mine dropped a nut into his inlet manifold of his CF Bedford.

Thought he was a clever cunt using his girlfriends brand new Electolux vacuum cleaner to suck it out.

The fuel vapours turned that puppy into a huge hand grenade and blew the fucking thing to bits.

We were still pissing ourselves 3 hrs later. She failed to see the funny side of it.

And the time my Bro-in-law thought he'd be able to suck some stones out of the fuel tank of his Bobcat... Was funny as...!

**thehollowmen** · 16th August 2010, 02:02

If I just put bad mechanical judgment into this, a litre bike at 1100 rpm (idle for a GSXR) will be sucking 1100 cubic litres of air per minute.

A VANTEC TD8038H 80mm Case Fan (I'm being generous picking a high end one) puts through 84.1 cubic feet per minute at 5700RPM. This translates to 2.4 cubic meters. Scaling to keep up with the engine, the fan will have to scream away at er... 2612500 RPM

So I look at these calculations, and use what little mechanical knowledge I have and it makes me wonder if it might give an unusual increase in low end torque due to being choked a little and therefore running rich. That or the placebo effect.

What does worry me is the engine will start sucking these fan blades up to speed, and I'm not sure how much stress they can handle (I'll probably work the forces out tomorrow when I'm bored at work), which makes them likely to break off into nice sharp bits of plastic, perfect for cutting through or getting stuck in the filters / carb / injector bits and pieces. Whadaya mean the warranty doesn't cover this?

Feel free to put me out of my misery if I'm in error.

**Old Steve** · 16th August 2010, 20:00

Originally Posted by Crasherfromwayback

Thought he was a clever cunt using his girlfriends brand new Electolux vacuum cleaner to suck it out. The fuel vapours turned that puppy into a huge hand grenade and blew the fucking thing to bits.

That reminds me of the contractors hired to degas one of the bulk petrol tanks at Mobil's Lyttelton terminal some years ago. You degas a bulk fuel tank by blowing air from a fan through the tank for some considerable time, then test for hydrocarbons to determine if it's gas free.

However these guys hooked the fan up to suck the air out of the tank. Petrol vapours over electric fan (as it was supposed to push air into the tank it didn't have to be flameproof), ignition, flame front moved faster back into the tank than the outgoing airflow, bulk ignition inside the tank, the steel "floating" roof of the tank went straight up and came down right inside the tank. No-one hurt - I do believe in miracles. Don't know how long it took the contractors to get their hearing back, or when they ever worked on an oil company site again.

**Bass** · 17th August 2010, 07:33

As I recall, a supercharger uses about 40% of the extra power that it generates. The motor on this one needs about about 12 volts and (say) 14 amps, i.e. about 170 watts.
If that is 40% of the increase, then the total extra power is about 425 watts of which the supercharger uses 170, leaving 255 watts extra for the rider to play with.
Thats about 1/3 of a horsepower.

**Pixie** · 17th August 2010, 10:31

It takes more than a hairdryer connected to a battery.
But it can be done: http://www.turbomagazine.com/tech/04...ger/index.html

**Pixie** · 17th August 2010, 10:33

Originally Posted by Crasherfromwayback

I'll tell ya what not to do with an electrical appliance...years ago a mate of mine dropped a nut into his inlet manifold of his CF Bedford.

Thought he was a clever cunt using his girlfriends brand new Electolux vacuum cleaner to suck it out.

The fuel vapours turned that puppy into a huge hand grenade and blew the fucking thing to bits.

We were still pissing ourselves 3 hrs later. She failed to see the funny side of it.

Same thing happens when people suck up a spider and spray insecticide down the vacuum hose

**Pixie** · 17th August 2010, 10:36

Originally Posted by jonbuoy

Blades have no grip on the air. I´m not even sure it wouldn´t disrupt the airflow in the carburettor venturi in a bad way.

What do turbochargers use? Scotchmist?

**avgas** · 17th August 2010, 10:48

Originally Posted by Pixie

It takes more than a hairdryer connected to a battery.
But it can be done: http://www.turbomagazine.com/tech/04...ger/index.html

Duh if you want 8psi
I am talking about just increasing airflow. Which does not really increase HP - but certainly helps response on a POS........mind due so does removing seats, doors.......and doing an oil change (lol don't ask)