Question about 1993 Harley Davidson XLH Sportster 883

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Hey. I'm building a big bore shovel.What I have now is: A set of Ultima Big bore cases( very nice pieces) and 4 1/2" truet +osborn wheels and a set of S+S hd rods, stock length. 7.440. My questions are what jugs and pistons do I use with this combo? Stock length or the .200 taller jugs? And do I use the stock 3 5/8 pistons or do I need to hunt some special app. piston for the 4 1/2" wheels? I don't care if I come out with the 93" s or not. Just want a tight bottom end. And... How far from the realm of possibility is taking a stock set of heads and making them 3 5/8" ?? Am i wasting a set of heads ? THANX!!!

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  • jntaylr_113 Sep 08, 2010

    ok look...this is a custom build. S+S MADE 96" FOR HOW MANY YEARS??? This is really not a big deal. Just unsure and don't want to buy 2 of everything to mic
    it out.

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To start off 3-5/8" pistons are compatible with that setup. That is generally the bore people choose when going with performance rebuild setups. Now the stock heads can most likely be trimmed to 3-5/8" but to be honest they will most likely overheat and cause alot of issues. I dont know what exact motor you have in your big if its a big twin or what. Cause it doesnt say in your question. But you would have to figure out how much needs to be bored to reach the desired bore and how much will be left. which would be this to see if your jug/piston combo will work(bore/2)^2*pi*height or (bore/2)^2*pi*(the thickness of the head gasket-the .0025" the piston is occupying at TDC of that head gasket's thickness) An if you are using stock length rods and stock size pistons just larger bore which adds to radius volume not stroke of the piston. k So when you put the jug on youd have to do the math or just look at eye if it will be higher. You could just do all the math based on everything. but considering one or 2 pieces seem to be bigger you might need the .200 but if the piston is 2 low and cant hit TDC. Then youll either have to figure out the correct head height. Or redo the math on the parts your putting in. But from quick figure of math the stock length should do assuming the 3-5/8" pistons arent special or have higher height. if you have any further questions or need further assistance please feel free to follow up with a comment and i will be glad to assist you. Thanks, Midwest-tek

Posted on Sep 10, 2010

  • Nathan Ayers
    Nathan Ayers Sep 17, 2010

    If your asking then the stock will be fine i did the math with what info you provided and filled the rest in with stock specs. So it should be no problem to mic it out as you say.

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Personaly i think that the standard option is the best ,if you start playing with oversize this or that i think that in the long run you will just be asking for problems later down the line .if you want a bigger engine then fit a stock unit rather than spend hard earned cash on some so called custom job because if these engines were meant to be like this they would leave the factory like it and simply listening to all the boy racers will only cost you money in the long run ,i mean the max speed limit in most countries on this planet is 70mph .

Posted on Sep 08, 2010

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