Re: fuel injection out boards
Okay, PDiddley.<br /><br />Get a cup of coffee. This isn't gonna be short.<br /><br />Two stroke cycle outboards (2 strokes) come in three varieties. Carbureted, EFI and DFI.<br /><br />Carbureted engines do not have computer control. They use old, but proven technology, pollute the most, smoke the most and use the most fuel. They may use mixed fuel or automatically mix the fuel. They are the easiest for us shadetree guys to work on.<br /><br />EFI (Electronic Fuel Injection) 2 strokes are computer controlled and inject fuel and oil into the crankcase. They are less troublesome than carbed engines, use less fuel, smoke less and cost more.<br /><br />DFI (Direct Fuel Injection) 2 strokes use very new technology. They are computer managed. Fuel is injected directly into the cylinder, similar to Diesel engines. Oil is injected into the crankcase. They are much cleaner burning, use a lot less fuel, smoke very little and cost a lot more. DFI engines include Ficht, Optimax, HPDI and some others.<br /><br />Four stroke cycle outboards (4 strokes) are either carbureted (no computer) or EFI (computer controlled, fuel injected). Both are very smooth economical and quiet. Little or no smoke, very clean running.<br /><br />The EFI 4 strokes are easier to operate and usually make more power and use less fuel than carbed 4 strokes. They are also usually heavier than the carbed 4 strokes, which are usually heavier than carbed 2 strokes. <br /><br />EFI 4 strokes are usually developed from proven, high output car engines. Yamahas are an exception, they are all designed from scratch to be outboards. That doesn't necessarily make them better, just different.<br /><br />Each type has its fans. Each fan has good reasons for preferring his favorite.<br /><br />Each fan also often has some myths about other engines. Don't take anyone's word when he is bashing some type of engine. It is his way of defending his favorite.<br /><br />Hope that helps.
