After re-reding my earlier post, I see some mistatements and inaccuracies. Surprised I'm not all fried-up by now! Maybe no ones listening. Thats good, now I can escape!
<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by joe117:
That was an interesting experiment with the leaf blower. I'd like to know exactly what happened, did you drive it with the experimental rig?
Yup, it made some extra torque, (nothing outrageous, but noticable when mashing the throttle down), as measured with my seat of the pants dyno. This was mostly at 2500rpm and below, on a 350 V8. At higher rpms, it just got in the way, 'cause it didn't produce enough CFMs. Waste of time. Later versions, using reverse curved blades in a tighter housing, did better, but still not enough CFM to take it all the way up to redline. My experiments are sporadic, and I'm really not focused on making a blower, its just sort of tinkering around. Maybe I'll take another stab at it soon.
Was it just a total bust?
No, I learned about the characteristics of various blower designs a little better. Still learning.
The bilge blower supercharger that we are talking about is obviously not a real sc and anyone who buys one expecting sc results, will be very disappointed.
That might net you something on a small displacement engine, like a 4 ****** or something.
All that being said, they are only claiming a small hp gain.
Another issue is, Will your engine management computer be able to flow more through the injectors, to compensate for the greater air flow? If there is a max flow rate in software, then it don't matter how much air you pump in, it will just go lean. Thats what I like about having a mass air flow sensor, it will sense the increased air flow and adjust fuel flow accordingly. (Up to the limit in software, after that point you would benefit from a performance chip, with higher flow rate parameters)
It's not the same kind of fan that you find in a leaf blower.
Thats a good thing!
Even if it couldn't give boost at 850 cfm it might flow 850 cfm, could it give more air without boost over 14.7 psi? Could it improve flow without boosting?
If you somehow adapted that stuff, and had enough CFM at redline, but no gain in boost, then there is no net gain. Its just along for the ride. It must apply pressure of some sort, to be of any value. Maybe you end up with 1psi from 4000rpm up to redline, but 5 psi up to 4000rpm. That would give you a funny torque curve, but may be useful. But instead of thinking that way, why not aim for say 5psi at all rpms, and don't even think about anything less?
I just want to know why it couldn't give a handful of hp more than without it.
You need to get the technical data sheet from whoever makes that device, and see how many inches of mercury it moves, and at what CFM.
People buy smooth tubes for a very small gain in flow. People buy K&N air filters for a very small gain in flow.
I wouldn't put one of these on my lawnmower let alone my Viper. I know it's a misrepresentation. I just want to know if their actual claims are necessarily false.
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I think if you strap Monica Lewinski to the front of your Viper, you may notice some gains, but if not, look at the fun you'll have!