Which is better, turbos or supercharges on GPU's. I have seen turbos but not many blowers on airboats. Why is that? It just looks to me that it would be a way to gain 50+ hp. I know that for a turbo application, the compression ratio is lower, around 7:1. So wouldnt standard GPU's(8:1)work well with turbos? I am not familar on the supercharger application. What do yall think about these toys?
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turbos vs supercharger
- Thread starter AirAg
- Start date
Actually a standard GPU runs at 7:1 comp. I have seen onr with an eaton blower from a ford thunderbird supercoupe, and was driven from a custom flywheel pushing about 4lbs. boost. I also have pics of a turbocharged GPU that uses a simple draw-thru setup that I heard works well, but I have not personally seen it.
blown
turbo
Larry
blown
turbo
Larry
Both units do the same thing add more air in the mix. One of the biggest differences is a supercharger has instant boost where as a turbo charger takes time to wind up before you get boost.
Super Chevy magazine just had a great article on superchargers vs. turbochargers in Oct. 05 issue. If you can pick one it might be worth it.
Tim
Super Chevy magazine just had a great article on superchargers vs. turbochargers in Oct. 05 issue. If you can pick one it might be worth it.
Tim
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Anonymous
Guest
You'd better have a monster oil cooler with either one.
One reason (probably the main one) that aircraft and GPU's have such low compression is because they are air cooled.
One reason (probably the main one) that aircraft and GPU's have such low compression is because they are air cooled.
Waterthunder
Well-known member
If you run a blower or supercharger on an aircraft at see level you will have some serious issues with running it dry or hard. You will not be able to add that much boost because when you make more power on an air-cooled motor it doesn’t have the ability to dissipate the heat. Just ask any guy who runs a turbo on a Porsche or Volkswagen. The main reason they run superchargers and turbos in aircraft is to enable them to make horsepower at higher altitudes because there is less oxygen present in the air. 90% of the supercharged Lycomings I see are always talking about over heating problems and they generally only race them I have never seen one in the woods bouncing of trees you pretty much only see them on the water. I may be wrong but I think if you want a ride boat. The power or boost you gain will not be worth it if you plan on running it hard. If you want to race then no question go with a turbo or blower.
Waterthunder
Well-known member
If you cool the intake charge your making even more power which will make the motor run even hotter. Generally in the engine world air-cooled motor’s don’t like having power adders because they can’t dissipate the heat created from making more horsepower. Adding an inter cooler will also block air to the prop along with adding weight. With all of this work your looking to gain 50 or so HP. If you make much more than that it will be a pinging overheating race only gas motor.
marshmaster pat
Well-known member
Water - I may get this wrong, but from other discussions I had the impression that a small nitrous system would probably work out better if someone was looking for just a short duration of increased power, like running up the hill or crossing a dry stretch. Something like a 25 hp per shot system.
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Anonymous
Guest
Most definitely Pat!
Nitrous is a lot cheaper to set up, easier build everything else around, and it produces consistant power gains throughout the RPM range of the engine.
Nitrous is a lot cheaper to set up, easier build everything else around, and it produces consistant power gains throughout the RPM range of the engine.
Waterthunder
Well-known member
With an aircraft motor N2O is the only way to go especially if you want to ride around allot or run dry. An air-cooled motor just doesn't have the ability to dissipate the heat that comes along with making 50 or 70 more HP. Since NOS is only short bursts it will work on an air-cooled motor. People think their angle valve 540 or 200 run hot throw a blower or turbo that makes 50 plus more HP on it and you will have a Chernobyl
Ok, so with Nos, how long will a normal size bottle hold up. I have heard that they only last 30 seconds for the whole bottle....dont know if that is true though. And also, how long can you normally use it on one spurt before hurting your engine. I am constantly learning new things on this site. Thanks again for all yalls help!
Waterthunder
Well-known member
That’s B.S. a 50HP shot will last a lot longer than that. When you run a 250HP shot you can get three or so 9 sec passes. You just need to maintain a bottle pressure. When you run NOS for a long time the bottle will cool of and loose pressure. Once it heats back up your fine for another shot.
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Anonymous
Guest
AirAg":1f2nmo7u said:
What, have you been watching "Fast and the Furious"?
They make bottle heating pads to keep the bottle pressure up.
Ever have a CO2 powered pellet pistol? Notice how the cartridge gets really cold if you shoot a lot of shots real fast? And it doesn't last that long. But if you space your shots out, the cartridge will last more shots.
This is the same principle that Waterthunder is talking about, and AC works the same way