looking for more power ?? DUHH of course....turbo chargers....produce a boost, right ?? well...what about taking an old shop vac in the bed of your truck with a power inverter....250 mph winds, through a 2" pipe, would get a great deal of boost...but i'm not sure if any one is crazy enought to do this

i would ..but i don't have an EFI truck...and i am not gonna try it in my mustang..altho..it would be fun, but..who knows...

 

You have three places of obvious power loss.

Crank turning the alternator.
Alternator driving the inverter.
Inverter driving the shop vac.

You'll end up wasting twice as much horsepower then you'd gain with the shop vac, assuming it *could* flow enough for a V8 engine.

But I'm assuming you weren't serious

 

i was only truley joking, BUT what about ..if you were to play around with it......stick the truck on a dyno, and plug the shopvac into the wall....then there is no drain on the alternator, and boost provided....i was only think for the mear fun of it...but don't tell my g/f that

what about a smaller motor, say a 2.3 L that only needs...eerr 300 CFM, and you produced that much from a shop vac and then some

 

I don't believe shopvacs produce that much flow. I had made a homemade flow bench using a shop vac, a MAF sensor, and some plates so I could measure the flow of cylinder heads port by port. A shop vac gave me inconsistant readings, which I presumed to indicate it didn't have enough flow even for ONE intake runner.

I ended up using a gas powered leaf blower... that gave me significantly more stable results. But damn, its loud.

 

Hey, those shop vacs will suck up gravel. Stick one on blow and try it. It's more than 8 or 9 psi. The prob is you'll need to build in a relief valve.

 

8 or 9 psi? Not even close. Try 1, 1.5 tops. Cork one and put a pressure gauge on and get back to us.

 

1 psi in a shop vac? Or in a supercharger?

 

Shop Vac.

Without any math at all, its easy to figure out how useless a shopvac would be as a supercharger.

At "full tilt", a 6-71 supercharger would draw about 40HP off the crank. An 8-71 supercharger would draw about 55hp off the crank.

A shopvac has a 1/4, 1/3, or 1/2HP motor.

Still think it would work?

 

I do. It has high boost. Like earlier said, try puttin it on blower, and you'll feel the pressure. May not be as powerful as an 8-71 or what, but for less than 100 dollars, beat it.

 

Okay, install a shop vac and be the envy of the neighborhood then.

 

The best thing I've seen around here so far is a tin can on a civic. It makes me cry. The sound gives me a headache, and when the thing backfires, it scares me.

 

I've never understood the value of a 4" tailpipe on a 1.3L anything.

Though, I've never really been a fan of the import crowd. Though, I have seem some amazing fiberglassing and modifications. In fact, I've drawn on various "import doodz" for assistance with my custom dashboard project. But I never understood the point of looking fast, if you aren't fast. I tend to prefer the opposite... looking slow an unobtrusive, but very fast. Hence my fetish with building "sleepers".

But to each their own, building an fabrication whether it be a truck, an import, or a birdhouse is all good stuff.

 

my truck is a 281..I'm looking for a 4" for my 281...4.6 litre...

 

id say a shop vac wouldn't produce any boost at all on an engine. A turbo or supercharger compresses air and sends it into the motor all the shop vac will do is blow air not create boost pressure. I have yet seen anything electric that could mimic a turbo or SC.

Sounds like a guy i know that changed pullies on his Pintos smog pump, ran a hose from it to his carb and swore it made more power

 

SC and/or turbo blows air- hence the fan or blower. It blows air so hard, it gets compressed together, since the engine cannot consume it all. The same goes for a shop vac. The air keeps getting blown in, even when the engine is on power stroke, exhaust, etc., so it keeps blowing, and compressing. Shop vacxs may not produce like a SC or turbo, but for 60 bucks, buy 2 and blow both of them. See what happens then. If your alternator can handle that, of course...