12 replies to this topic

[Earthling]

Well, I was just tinkering around with my engine (Mustang 5.0) for the hell of it, then it struck me like lightning! Why not hook up the smog pump in such a way to make it feed air back into the intake and act like a low pressure supercharger? I mean if it gives us just 1 psi of boost that's an extra 5% of free power, a useful gain by any standard... All this from the crappy smog pump we love to hate. Maybe there is such a thing as a free lunch after all. Its just a matter of how much positive boost the pump provides, and how many cfms it flows. What I'm saying makes sense on paper, but I'm not sure it translates to real world gains.. If anybody has any ideas on this or any rough estimates of smug pump outputs, I'd love to hear em. Thanks

[Earthling]

Anybody? I'd really appreciate some input on the matter..

[AdamLarnachJr]

Ill give it a shot:)

I have a 5.8 litre Ford engine in my Bronco, EFI, smog this smog that California engine, has the smog pump with the air injection tubes in the headers, really weird, plus there is an air injection tube in the second dual stage catalytic convertor.

My only knowledge is this, the smog pump is the poor mans vacuume pump (Moroso's retails for $350+USD), I dont think it can be used for that purpose, but thats just my gut feeling on this.

An idea I was thinking about earlier was an electronic motor driven supercharger, something akin to a Moroso or Mr. Gasket electric water pump drive could be used with Gilmer style pulley's to spin a supercharger at say 5000rpm pulley speed, that could translate into a 100,000rpm+ impeller speed, just a thought because I know you Stang' guys like those superchargers.

[Earthling]

Even if we could use it as a vacuum pump to scavenge the crankcase, the gains would be minimal at best on a stockish motor, on the order of 1-2bhp at most. As for your idea of an electrically driven supercharger, considering blowers soak up on the order of 60 bhp at full bore, that would require an ungodly amount of current, nearly 4000A to turn! You didn't consider the possibility I mentioned, namely hooking the smog pump's output to the air intake (before the MAF) feeding it more air... What do you think?

[Guest.]

I think you would gain more by taking the belt off the smog pump.

[AdamLarnachJr]

Well consider this, a typical american V8 water pump consumes anywhere from 15-25hp, if an electric motor can run the water pump at a constant RPM and still offer better cooling (thanks to the higher RPM the motor is always turning out) you would have constant boost pressure, with a centrifugal supercharger that could mean quite a bit as even those babies need time to spool up as opposed to a roots style.

Try this, there should be a line running into an exhaust pipe from the smog pump, run it into a fitting on your intake manifold, preferbly before the runner split off, possibly where the air filter assembly meets the intake manifold, see what kinda performance you get if any at all.

As far as using the smog pump as a vacuum pump, you can expect a good increase in hp, anywhere from 5-20hp, it offers much better ring sealing, almost works like a dry sump oiling system. As far as not using the smog pump, WISH I COULD GET RID OF ALL THAT CRAP! THE AIR IS STILL SH!TTY EVEN WITH 2 CONVERTORS AND UNLEADED FUEL!

[just me again]

What exactly is a smog pump, is it just a pump that blows fresh air into the exhaust before the cat. i don´t recall that i have heard about it on cars in europe.

Bjørn

[Terrance W. Peterson]

Have seen smog pumps used as superchargers on drag bikes.

[Guest.]

You could always try this.

[desmo]

The return of the centrifugal supe! Should clear any leaves from the intake.

[AdamLarnachJr]

Thats a brilliant idea! Is that a leaf blower? You could adapt a 110v output to your truck and bodabing!!! How much boost could that put out, I know the gasoline powered ones can rip your cheeks apart.

[Ferrari FX]

Ok, I'm going to try a hair dryer...

[AdamLarnachJr]

Yeah I think even some of the new ones have a "cool" setting on them:) WHO NEEDS AN INTECOOLER!