![]() ![]() Give them a call, but be prepared to spend some money. L圜on should be able to help with all of this. Of course your case has to have been configured to support the prop governor as well. I don’t know the specifics about this engine, but many Lycoming engines, and possibly this one as well can have a plug added internally at the tail of the prop shaft, and the front bushings changed to accommodate a constant speed prop. ![]() However, the biggest problem you’ve got, which Paul points out for you, is that you have a crank that is configured for a fixed pitch prop. You can retrofit an EFII electronic fuel injection and ignition to the engine. They can provide higher compression pistons. They can help with cleaning up the intake areas and flow matching the cylinders. Paul is a really knowledgeable guy, but I question how much he dabbles in the Experimental area, and he sure can’t recommend that you get very far out of what Lycoming deems as acceptable. The question about adding horsepower is being asked of someone (Paul) that works in a certificated stock Lycoming world, but the question is really about operating the engine in the Experimental category. Michael, I apologize for putting a damper on your project, but I’m certain there are other options that you’ll be looking at that will allow you to complete the project. The 300 horsepower engine is a completely different breed altogether and you can’t get there by converting your engine unfortunately. There are 260 horsepower O-540 series Lycoming engines, but they have many different components, such as the crankshaft making it uneconomical to try to convert your engine to that type of configuration. I can’t emphasize enough that the most reasonable thing you can do to get the 250 horsepower is to change the pistons to a higher compression ratio, remembering that it’s done as an experimental configuration. When I research the genealogy of this series of Lycoming engines, I can tell you that since you’ll be using this engine in an experimental category aircraft, the best you can do horsepower wise is 250 horsepower.Īgain, since it’s an experimental category aircraft, you could consider installing 8.5:1 compression ratio pistons and at 2575 RPM that should give you 250 horsepower, but that would be about it, and you’d be on your own as far as reliability, etc.īy changing the compression ratio, it actually falls in line and would be similar to the Lycoming O-540-A1D5 engine that is rated at 250 horsepower at 2575 RPM with the 8.5:1 compression ratio pistons. ![]() It was configured for a fixed pitch prop only. This engine was used primarily on the Piper Pawnee PA-24-235 and the Piper Cherokee PA-28-238. This particular engine is FAA certified and rated at 235 horsepower at 2575 RPM and the compression ratio is 7.20:1. A: I’m afraid I’ve got some bad news for you regarding the horsepower for your O-540-B2B5 Lycoming engine. ![]()
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March 2023
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