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Thread: OMG, another guy who wants to convert his 15hp to a 10XS

  1. #11
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    Upon further inspection the oil line going to the carburetor has some sort of check valve in the reed plate. Connecting to the intake cover may allow more oil to the bearings for the increased rpm and 25:1 oil ratio the 10xs calls for

  2. #12
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    Quote Originally Posted by GheenoeRacer View Post
    I'm interested as well, so far I've cleaned and polished castings on the exhaust. Not sure if I want to dry up exhaust. What did you do during blueprinting? In the 10xs pics, the small oil line goes into the intake cover. Why is this?
    Compression relief to make starting easier, has miniscule effect while engine is operating..........
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  3. #13
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    Quote Originally Posted by GheenoeRacer View Post
    Upon further inspection the oil line going to the carburetor has some sort of check valve in the reed plate. Connecting to the intake cover may allow more oil to the bearings for the increased rpm and 25:1 oil ratio the 10xs calls for
    yes it is very important especially when "making" a intake to keep the bearing oil feature...........

  4. #14
    Team Member LittleCharger's Avatar
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    Quote Originally Posted by modifiedoutboard View Post
    compression relief to make starting easier, has miniscule effect while engine is operating..........
    x2...

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    Team Member LittleCharger's Avatar
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    Quote Originally Posted by GheenoeRacer View Post
    Hard to quantify, yes. But lost compression if any is still lost compression, especially since these motors lack it and I don't think there's anything that can be done about that, unfortunately. I believe these motors have a lot of untapped potential. There's also a lot of interest in these motors because so many people have them. Could a piston be designed/ modified to increase compression?
    Custom Pistons or welding up top of cylinder to increase compression, same thing the guys do on the 3 cylinder merc's
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  6. #16
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    One other trick is to line bore the block closer to the head, then take a cut off the block to make the crank fit again. That raises compression but DE-creases port timing, so you have to bump that back to stock (which lowers the damn compression again!)

    Be nice if the head came off, but... At least there's no head gasket to leak.

    Jeff
    "We live at the bottom of an ocean of air." - General Marvage Slatington
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