I don't want you all to theink "he musta smoked a good'un"   but I was leafing through the online catalogue of a UK-based company selling accessories for track-modified cars...

I came across this ...  



It come in two versions, 3" blades blowing 135cfm, 4" blades blowing 235 cfm.

A little math says 135 cf = 3820 liters, and 235 cf = 6650 liters.

The Savage being a 650cc, at a howling   6000 rpm will suck in 1950 liters.

Hmmm...

I'm not saying we can blow the Savage at 15-20 psi boost... ...

But a little imagination can go a long way...

We can have the carb before the blower, or blow the carb directly.

The first solution would have the air/fuel mixture race through the blades, so we want to ensure the electric motor of the fan is quite airtight, or...

The second solution has the fan blowing air into the carb, a solution used by Maserati for the "Biturbo" of the 1980s, but they had to enclose the carbs into an airtight box in order to avoid the carb itself bleeding fuel through the various gaskets (so they say... never had a Maserati...)

At $50/unit, it's food for thought !

Thoughts ? Food ?  

I wonder if you could somehow tie in the speed of the fan to the throttle position, such that at idle, the fan would be off (or at a low speed) and at WOT the fan would be full on. maybe someone with some skill in electronics could rig up something like that.

I'd opt for the blower to be before the carb, just for ease of installation and the idea that it wouldn't mess with the flow/dispersion of the air/fuel mixture, but i don't have any scientific reasoning behind that, just a conjecture.

Flip the switch & pull the choke?

These things showed up on the car forums years ago.  This is nothing more bull shittery.  It is a marine bilge blower "marketed" as a electric turbo.  Lots of folks bit on this years ago and screwed up their cars when the unit broke and sent parts flying into their air intake at WOT.  Sheer fraud...check this out.
http://www.wholesalemarine.com/p/RUL-240/Rule+In-Line+Bilge+Blower+For+4

If that was in a "performance car catelogue", I believe I would throw it away.

Gyrobob made exactly the same assumptions I made, so I'm glad I thought it out correctly.

MPNoffi misunderstood me, (or maybe I didn't put things in the right perspective) the fan/blower is advertised for ventilation of the windshield to avoid misting;
you won't find aircon in a track car, much less a complete dash - it was my wicked idea to fit it elseways.

Well, I see I've caused some decent interest, what next?
...

Elastic jets to change the mixture at varying altitude...

engineer wrote on 09/23/11 at 07:40:29:


Being a fan and not a positive displacement pump, the output of the fan will be pretty much limited to the amount of air the engine is sucking in at any given rpm.  The overall effect will be only that of reducing some of the flow restrictions of the airboxes/manifolds/etc. upstream of the carb,... sort of like the ram air system on the Hayabusa.

RadRacer wrote on 09/24/11 at 20:54:31:

Neat idea.  I wonder if it works.

There would be a few things to keep in mind about their performance claims:
--  1 PSI NET BOOST (measured on the intake at wide-open throttle)  Up to 15 more horsepower GUARANTEED!  If they say "up to" that allows them to explain that when you get only 3 more horsepower, they can say, "Well, we said "up to" not "more than."
 -- 5% more horsepower through the entire RPM range!  This would be really hard to document.  I'd like to see their test results.
 -- Safely draws over 833 WATTS from the battery when activated at full-throttle!  Using over 62 AMPS...  This is a LOT of amps.  With normal amounts of inefficiencies, it would take 2 to 3 horsepower at the alternator to drive this thing.  (1 hp = 746 watts if efficiency is 100%)
 -- Only the e-RAM flows 800 CFM! (unrestricted air-flow)  This means if you set it on a bench in free air, it'll flow 800 cfm.  In an intake system, with an engine sucking in less than 800 cfm, it'll flow a lot less.

I wonder what the duty-cycle is.  How long can it be run at a time?  Does it heat up?  Can it be run continuously, or it is used for short-duration boosts like nitrous?  The switch you mentioned makes it sound like an intermittent thing.

I wonder why they don't show a pic of the actual blower.  Does it look something like the pic in the first message of this thread?

What kind of noise does it make?

Still, it is an intriguing idea.  If you install it, it would be cool if you could do some before and after measurements to show how effective it is.  At $300 for the small size, it better be pretty effective, eh?

justin_o_guy2 wrote on 09/25/11 at 11:25:26:

 

Balderdash & Fiddlesticks,... sounds like a British law firm.

I would be inclined to not use something like this either, unless there was some way for it to use a positive displacement pump. Then at least you would get some degree of actual supercharging, rather than just a psi or so.