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  1. #1
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    Default New motor down on comp and power

    Looking for honest opinions here!
    engine is a 108" shovelution; STD bathtub chamber evo heads, axtell billet iron shovel cylinders, JE pistons ect.
    Just put about 600ish miles on it and now It feels as if its down on power. it sure as hell is down on compression. for the first 400ish miles it took my entire weight with TWO legs on the kicker to push it thru to start it, now its more or less the same as a stock evo as I can kick it thru relatively easily with one leg. But it also starts super easy now, 1 kick no matter the temp.

    My thoughts are my rings are either broken or Ive scored the cylinders SO bad im getting leaked compression. What leads me to that is when the bike is good and warm (over 50 miles) i take the oil fill cap and see white smoke puff out. not a lot but its noticeable. nothing from exhaust tho. Take the plugs out and theres a thin film of oil on top of them. plugs have no oil on them that I can tell.
    Bike still wheelies in 1st but feels like its got a bigger cam in it, as in the torque curve feels low till higher RPM

    I'm at a loss. debating weather to keep riding it this season or tare it down and look.

    -Edit- Forgot to mention I bought the motor "new" from nitrofrankies. after taking the heads off before I ran it I noticed there were slight vertical lines in both cylinders. couldnt feel them with my finger nail so I put it back together and didnt think twice. Maybe that fucked up my rings seating properly
    Last edited by TheHumbleWelder; 08-03-2021 at 3:15 PM.

  2. #2

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    The slight vertical lines will show up where the ring gaps are in fresh cylinders, after you turn the motor through a few times. No big deal.

    My take, based only on your description (of course):

    The pistons were fit too tight in the cast iron cylinders, and they have galled and scored the cylinders.

    Or, and this is easy, but a long shot, the head gaskets are blown to the oil returns (not common on evos) and it's leaking oil and compression.

    A leak check should maybe help, or at least a compression test, but the heads may well have to come off for a look see. Got a bore scope handy?

    Jim

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    Quote Originally Posted by JBinNC View Post
    The slight vertical lines will show up where the ring gaps are in fresh cylinders, after you turn the motor through a few times. No big deal.

    My take, based only on your description (of course):

    The pistons were fit too tight in the cast iron cylinders, and they have galled and scored the cylinders.

    Or, and this is easy, but a long shot, the head gaskets are blown to the oil returns (not common on evos) and it's leaking oil and compression.

    A leak check should maybe help, or at least a compression test, but the heads may well have to come off for a look see. Got a bore scope handy?

    Jim
    Thanks for the input jim!
    I'm thinking maybe it is galling or bad ring seating. the pistons were from axtell themselves so I'm assuming they were the proper size, but I may have been too rough during initial break in maybe?
    She got external head drains on it due to using shovel style cylinders.
    Forgot to mention that its a bottom breather too. And no smoke coming from breather tube
    Used one of my tiny mirrors and a flash light to look into the spark plug holes best i can, cylinders arent near as bad as i assumed. theyve got very slight lines vertically but no gouges or galled aluminum on em.
    ill re-do my pushrods for shits n giggles. but they wouldnt explain why im getting the puffs of white smoke from my oil bag.
    Last edited by TheHumbleWelder; 08-03-2021 at 5:28 PM.

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    Ron uses J&E pistons ...
    If you see the need to do a clean up bore, ya might need to get with him for replacements ..
    (515-243-2518)

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    (Noob comment warning)

    The heads don't need re-torqued, do they?

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    That may be hard to archive with Evo heads ...
    Two of the head bolts are under the rocker box ...

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    Quote Originally Posted by confab View Post
    (Noob comment warning)

    The heads don't need re-torqued, do they?
    i dont think they do, but my engine is a little unique in that it doesnt use thru bolts, the 4 head bolts bolt into the cylinders and the cylinders bolt into the case, like a shovelhead

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    Quote Originally Posted by Dragstews View Post
    Oh my.. Shovelution is crazy shit.

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    Good thread info dragstews. Mine is set up slightly different. I'm using a top fuel style std head with a cylinder fire ring and an o-ring as a head gasket.
    Here's a picture of the chamber before I put it all together
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    Click image for larger version. 

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  11. #11

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    You say in the title for the first post " New motor down on comp and power", but you do not say what the comp. test showed, have you done one or using your kicker pressure for that?

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    Quote Originally Posted by pan620 View Post
    You say in the title for the first post " New motor down on comp and power", but you do not say what the comp. test showed, have you done one or using your kicker pressure for that?
    Haven't done a comp test yet, got a tester on order now. I'm going simply off of kicking effort, which is significantly less than before. It doesn't have zero compression just a ton less than what it had

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    NICE!

    Jim

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    Quote Originally Posted by JBinNC View Post
    NICE!

    Jim
    Thanks Jim!

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    Oil filter mount bottom bolt miss the hole? Mock-up pic?

    Jim

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    Quote Originally Posted by JBinNC View Post
    Oil filter mount bottom bolt miss the hole? Mock-up pic?

    Jim
    Haha I knew someone would notice that. The delkron cases have too much meat in that area so the elbows run into the case not allowing me to utilize both mount holes. Mount has since been modified to fit

  17. #17

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    Quote Originally Posted by TheHumbleWelder View Post
    Haha I knew someone would notice that. The delkron cases have too much meat in that area so the elbows run into the case not allowing me to utilize both mount holes. Mount has since been modified to fit
    HaHa. My bet was that the fittings/ hoses hit the case.

    Jim

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    Eye-balling all the leftover deck on those cases ... Whoa !!

    I'm assuming that the bore is at 3-13/16" .... That's about as much bore as the case can handle, unless a Hi-Deck case goes into play ..

    ( You can do so much MORE with a four inch BORE )

    For the Noobs ...

    Last edited by Dragstews; 08-04-2021 at 11:50 AM.

  19. #19
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    Quote Originally Posted by Dragstews View Post
    Eye-balling all the leftover deck on those cases ... Whoa !!

    I'm assuming that the bore is at 3-13/16" .... That's about as much bore as the case can handle, unless a Hi-Deck case goes into play ..

    ( You can do so much MORE with a four inch BORE )

    For the Noobs ...

    You're dead on dragstews! 4 3/4 stroke and 3 13/16 bore

    It's backed by a CPC Trans I built too,I know you get a kick outta those haha
    Click image for larger version. 

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    She's got a milmeyer kicker arm too. The original stroker kicker arm

  20. #20

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    That 3 13/16 bore stuff is pretty much an orphan nowadays.

    Jim

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