View Full Version : Turbo on gyro engine
05-14-2004, 06:52 AM
I am just currios . Has any one knows of someone that use TURBO on a Subaru,
Volks Wagon engine? or other engine for gyrocopter :D or 911 Porche engine.
05-14-2004, 07:51 AM
05-14-2004, 08:20 AM
While it certainly isn't the norm, they are seen occasionally. I have seen more on a Suburu than Volks but Johnny Hay used a turbo on the 'Big' (2443 cc, I believe) Volkswagen that he used to compete in the PRA jump takeoff contest several years ago. This was the $25,000 contest won by Dick DeGraw.
Turbos have a certain romance about them but I suspect the disadvantages out weigh any advantage they may have. Now, if anyone has visions of resetting the new altitude record then maybe they might want to consider one. And if the reason is wanting some extra horsepower, well, I guess one could rig up some nitrous for that quick climb out :D
05-14-2004, 08:27 AM
I am not aware of disadvantges in a turbo engine. In europe there are some rules to have a twoseater at max all up weight at 450 kg.
This includes 2 persons and fuel for one hour!
The Rotax 914 turbo is about the only engine used in training over here.
It is not possible to use a legacy 2.2 or 2.5.
Very few people use two strokes.
I use a turbocharged 1.6 lit ea 71.
This engine has even a better power to weight ratio than a 914 turbo, altough it is still 5 kg heavier.
Several machines are already equipped with this engine, simply because there is no alternative.
The turbo engines always have better power to weight ratio's compared to atmospheric ones.
05-14-2004, 07:15 PM
I really like Dick Degraw and have never met Mr.Hays But..... I think Mr Hays should have won that contest.
05-14-2004, 07:42 PM
Plenty of turbo Subaru's flying in Australia. They do put out surprising horsepower.
05-15-2004, 06:56 AM
The turbo-equipped engine will almost always put out more power but what I was referring to was the complexity of the installation. They may be common in the other parts of the world but in the U.S. you don't see that many.
The Rotax comes supplied with everything needed but unless a turbo Suburu has everything stripped from the car when the engine is pulled then there is the hassle in getting all the parts and etc. I realize that is also a problem with the fuel injection systems. I can't say I wouldn't consider a turbo but I suspect I would vote for simplicity.
I went also the way stripping cars, but put a stop a the time consuming driving around.
Today we build our own manifolds and have a turbocharger designed for aviation with a delta ratio equal to 1.
Our engine today is single carb turbocharged and one wire for on and off.
our engine naked bloc is 42 kg.
Complete and dry including all electrics and exhaust 75kg
Installed wett including everything between startbutton and prop,even the battery 88 kg .this for 140hp.
05-15-2004, 08:35 AM
What would one of those little gems cost? Shipped to the US of course.
05-15-2004, 11:01 AM
The subaru ej 22 lists hp at about 130 stock, there are a few 2.2 turbo engines that were from the factory, their hp is listed at 160.
Running gobs of boost is great but on several projects that I worked on you run into detonation problems even with an intercooler and I doubt that anything over 10 lbs boost at full throttle in aviation apps could be toleraterated for any length of time. 6 lbs is a nice medium for fixed waste gate type systems. A lot of dodge,chrysler, mits engines came with a fixed waste gate and averaged 4-7 lbs boost full throttle.
I once had a saab 9000 2.3l 4 cyl with a broken wastegate controller. The wife came in and complained of too much noise. The boost was averaging over 20 lbs, but whew what a ride that thing had. I could not believe how much hp a 2.3 on boost could produce. Factory cut out at 12lbs..... I dont think the engine would have lasted too much longer if it kept driving like that though.
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