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  1. #1
    isa alnoaimi's Avatar
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    damaged riva piston dont know from what ?

    can anyone say what they think about these pics of damaged riva piston ?
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  2. #2
    Steve-m31164's Avatar
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    Cant see properly but it looks like they are undersize . Too much clearance in the bore size .

  3. #3
    isa alnoaimi's Avatar
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    liner pics

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  4. #4
    isa alnoaimi's Avatar
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    Quote Originally Posted by Steve-m31164 View Post
    Cant see properly but it looks like they are undersize . Too much clearance in the bore size .
    no buddy the clearance is right
    this is a new block i bought from the dealer , and i installed stock bore size pistons

    my mechanic guy told me the problem is from the ring pistons ,but im not convinced that this is the reason

  5. #5
    big john's Avatar
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    what was your piston wall clearance ???


  6. #6
    formerly Gold06RXP Turbo Nick's Avatar
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    Stock piston to wall clearence is for stock power levels.

  7. #7
    bscpaint's Avatar
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    Even stock piston bores should be honed to size of each piston. That's why when you get stuff back from the machine shop everything is numbered. If it didn't matter they wouldent take the time to say ok this #1 piston goes in this #1 hole.

    The pictures didn't come out that good but from the looks of one picture it seems to have 4 corner scoring which is a sign of overheating or not proper warm up. You have to take better pictures for a more accurate responce

  8. #8
    tealgreen2000's Avatar
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    Quote Originally Posted by isa alnoaimi View Post
    can anyone say what they think about these pics of damaged riva piston ?
    i did the same thing an mine looked the same the piston to wall clearance is to tight the forged piston need more clearance than the stock cast pistons
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  10. #9
    isa alnoaimi's Avatar
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    Quote Originally Posted by tealgreen2000 View Post
    Quote Originally Posted by isa alnoaimi View Post
    can anyone say what they think about these pics of damaged riva piston ?
    i did the same thing an mine looked the same the piston to wall clearance is to tight the forged piston need more clearance than the stock cast pistons
    i think your right on this one
    but my problem is that i have a low pressure readings for all of the cylinders
    i checked 3 times the valves for a leak but there wasnt any
    i opened my engine to solve the low pressure issue , and i discovered my piston is scratched

  11. #10
    DP.'s Avatar
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    Could be poor lubrication due to contaminated or thin broken down oil, each bore runs a different tempature also.
    How often do you change your oil?

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