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Thread: O-290D to O-290-D2

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    51-pa22's Avatar
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    Default O-290D to O-290-D2

    Is there a legal way to convert the O-290-D over to an O-290-D2?

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    Steve Pierce's Avatar
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    Default Re: O-290D to O-290-D2

    Would take a lot of swapping just from a parts stand point.

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    51-pa22's Avatar
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    Default Re: O-290D to O-290-D2

    is the case different? I can’t tell from the different part numbers what the difference is.

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    Steve Pierce's Avatar
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    Default Re: O-290D to O-290-D2

    No idea, I know the D2 has hydraulic lifter and the D does not. Why do you want to convert?

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    Gilbert Pierce's Avatar
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    Default Re: O-290D to O-290-D2

    You will need a D2 Lycoming data tag as well.

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    Default Re: O-290D to O-290-D2

    Just Checking first off but the reason would be hydraulic lifters, 10hp, & longer TBO. Unless I missed something.

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    Gilbert Pierce's Avatar
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    Default Re: O-290D to O-290-D2

    I was told by knowledgeable D2 owner that the reason for 1500 TBO was because of the 7/16” valves. He had 1/2” valves installed when he topped it.

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    Default Re: O-290D to O-290-D2

    Different cam to match the hydraulic lifters, Higher compression pistons, just a couple of other items....

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    Default Re: O-290D to O-290-D2

    I am assuming you are talking about a certified aircraft. The experimental folks just change to the higher compression pistons and call it good. I have a Wittman Tailwind with an 0-290G converted for aircraft use. It has the non certifiable slotted pistons, prop extension, thin flange crank as used on 0-235's, 13/32 stem valves. Uses a crank flange backer and Bernie Warnke wood Prop.

  10. #10

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    Default Re: O-290D to O-290-D2

    The 0290 d and up has hydraulic lifters. The 0290 has solid lifters. Hydraulic lifters are larger in diameter than the solids. I have converted the 0290 by having the case reworked to accept the hydraulic. Best wt to hp engine lycoming built was the 0290 d2b. Lighter than the 0320, flat rated at 140 hp, maintains hp at higher altitude than the 0320. I have close to 3000 hrs behind these engine's. Folks bad mouth them. Yes parts are high, yes some can be hard to get. 0320 A , engines are a direct larger bore copy. I bought 5 0290b2 engines from cubcrafters . They came out of Italian cubs he brought home to build. I still have enough to build 2 engines.

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