Scooter
Member
I would like to commend everyone for making this an enjoyable forum. And I hope we keep it that way.
Back in the propeller section, I asked why certain props weren't approved for direct drives. I still don't have an answer I can accept. Ken said, (Ken please don't take this as an attack, I don't mean it that way), that, to paraphrase, piston pounding causes excessive stress on the prop.
Well I thunk about this for a long time and reached the following conclusions. If you use a normally aspirated engine (carbureted) with some sort of a standard ignition setup, then your logic considering the above, I can understand. Dumping relatively uncontrolled volumes of raw fuel on top of pistons with timing which is just a calculated guess depending on jets and other outside influences, can indeed cause erratic pounding of pistons.
However, today's automotive engines have long evolved from that archaic technologic stance. I can't understand why some companies like Jabiru only produce carbureted engines. I even called them and ask them just that question. Their answer was that people in remote areas aren't trained to work on fuel injection engines. Piss poor excuse as far as I am concerned. The right answer is they don't have the technology and/or know how or the market isn't there. Which is the probably correct answer, they are dealing with people who just don't know better. It is totally beyond my logic why someone would pay many thousands of dollars for a 40/60 year old technology engine, when they can get a modern converted automotive engine for a faction of the cost.
One final thought about piston pounding, if the fuel and ignition is controlled as in a modern fuel injection engine, whereas the fuel input is adjusted and the timing is adjusted on the fly via sensors/ecu then there is no piston pounding. That's not even considering the increased engine longevity (at least double), reliability, fuel economy, and increased horse power you get with fuel infection.
I know a FI engine cost more, but the payoff is worth it.
Back in the propeller section, I asked why certain props weren't approved for direct drives. I still don't have an answer I can accept. Ken said, (Ken please don't take this as an attack, I don't mean it that way), that, to paraphrase, piston pounding causes excessive stress on the prop.
Well I thunk about this for a long time and reached the following conclusions. If you use a normally aspirated engine (carbureted) with some sort of a standard ignition setup, then your logic considering the above, I can understand. Dumping relatively uncontrolled volumes of raw fuel on top of pistons with timing which is just a calculated guess depending on jets and other outside influences, can indeed cause erratic pounding of pistons.
However, today's automotive engines have long evolved from that archaic technologic stance. I can't understand why some companies like Jabiru only produce carbureted engines. I even called them and ask them just that question. Their answer was that people in remote areas aren't trained to work on fuel injection engines. Piss poor excuse as far as I am concerned. The right answer is they don't have the technology and/or know how or the market isn't there. Which is the probably correct answer, they are dealing with people who just don't know better. It is totally beyond my logic why someone would pay many thousands of dollars for a 40/60 year old technology engine, when they can get a modern converted automotive engine for a faction of the cost.
One final thought about piston pounding, if the fuel and ignition is controlled as in a modern fuel injection engine, whereas the fuel input is adjusted and the timing is adjusted on the fly via sensors/ecu then there is no piston pounding. That's not even considering the increased engine longevity (at least double), reliability, fuel economy, and increased horse power you get with fuel infection.
I know a FI engine cost more, but the payoff is worth it.