0-290D2 HP increase

Discussion in 'Lycoming & Continental' started by planegene, Jan 22, 2018.

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  1. Jan 22, 2018 #1

    planegene

    planegene

    planegene

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    Ok guys I have been told that installing 0-435 angle valve cylinder on my 0-290 D2 will increase my HP and get me close to a 0-320.
    My question is, if this is true the angle valve 0-435 cylinders have the provisions for fuel injection. If I put the cylinders on my D2 and add fuel injection. What kind of HP increase would I be looking at?
    What about if I added a stage 3 cam?
    Also there is a guy in NC that is manufacturing 10.5/1 pistons for the 0-290 D2 now.
    Not being a real engine man, it just seems I should be getting at least 160 HP if these things are done to the 0-290 D2.
    What about electronic ignition.
    What do the experts think?
     
  2. Jan 22, 2018 #2

    TFF1

    TFF1

    TFF1

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    I think you will end up putting out as much power as a lazy O-320. High strung 150 hp vs easy going 150 hp. You will have to spin the RPM up probably at 3000+ rpm to see the horsepower that high. Now dump the cam and you might have something, at least a little more powerful and unique. Power is about cooling. Electronic or mags, if you can run 30 deg of timing, you will make more power; for a little while. Compression is detonation and heat limited. What would be a better goal is making a bit more power on less fuel. That is what the compression and timing will do. Maybe an inch or two more pitch on the prop at same RPM. Im for the conversion. I would put the cylinders on my G engine if it was easy; Its been done, but I'm not going to address the solid cam problem. If you are looking for more power, turning the 290 into a 320 will reap more dividends. Something cool to look at, angle valve would be cool.
     
  3. Jan 22, 2018 #3

    EAABipe40FF

    EAABipe40FF

    EAABipe40FF

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    If you want 160 hp., machine the cases to accept O320 cylinders and go from there. Cost of O290/435 parts is crazy. Unless you have a stack of NOS parts convert to a 320 IMO.

    (Tom posted while I was typing.......like minds)

    Jack
     
    Last edited: Jan 22, 2018

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