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1100 Sporti Conrod Orientation

Discussion in 'Spine' started by OldJock, Feb 25, 2014.

  1. OldJock

    OldJock Cruisin' Guzzisti

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    So I asked this already on WG while this board was down, so apologies to all who frequent both boards. However I thought the scatter gun approach was worth a try

    Stripping down an 1100 enigne and had difficulites getting of the big end cap bolts. Which I did get off but it ended in the rods dropping out before I had time to note the rod orientation

    One side of the rods have a painted mark on them on the rod neck. One side of the big end caps have a number scribed on them and both sides are machined. The eminent Dr Roper (God Bless him) and Triple Jim suggested machined side to the right, but nothing conclusive so I was wondering if anybody on here has stripped one and definitively knows the answer about which way around is correct.

    [​IMG]

    Numbered side to the right showing the scribed numbers, note its machined

    [​IMG]

    Other side rods to the left, note it is also machined

    [​IMG]

    Rods held up as they would be in position in the crankcase, note the painted marks

    Anybody help???

    Many Thanks

    John
     
  2. john zibell

    john zibell Moderator Staff Member GT di Razza Pura

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    The rods are perfectly symmetrical. To me it doesn't matter a hill of beans which side goes where so long as the rod and cap stay matched. The workshop manual makes no mention of orientation. http://guzzitek.org/gb/ma_us_uk/1100Spt ... _NL%29.pdf I'd say be consistent. You will be consistently right or wrong, but I don't think it makes much difference. On other vehicles I work on it does make a difference, but on this engine I'd say it doesn't.
     
  3. Fader

    Fader Tuned and Synch'ed

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    Hi John- because I don't have a pair of that model's rods in front of me nor have I rebuilt one that new in a while, (I also own a Sporti) can you look on one rod upper if there is a small hole on one side, of the longer part (going up to the little end) that is just above the bolt hole? On older rods (which I have plenty of here) they have a hole that is drilled from the inner circumference of the big end up to the point I described above. What it does is uses crank oil pressure to spray oil up into the cylinder wall. If they have that hole, (which on older rods the factory matched with one machined side) goes to the right side of the motor.
    If they don't have that hole, I would say the machined side with writing goes to the right- also if the orange paint dots go toward the front, when the machined side with writing is to the right, then more-so I would say that is correct. (for some reason I remember paint forward) And as John said above, the new manuals do not explain any of this, because it may not matter if there are no oiling holes.
    You like the nice puzzle I just described? hahaha sorry I don't know how else to word it.
     
  4. OldJock

    OldJock Cruisin' Guzzisti

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    Thanks very much for the input guys, appreciated.

    As JZ stated and I forgot to mention in the post absolutely nothing in the manual regarding orientation.

    The rods have symmetrical holes in the small ends two at the bottom and one at the top. The top one could be possibly for piston crown cooling.

    There are no holes on the rods for spraying onto the cylinder walls as far as I can see and the slots on the big end caps are again symmetrical, so I don't think it makes much odds either and I'll install as shown in the photographs and as recommended by you as well.

    I'll post back up, though it's going to be a long time, if it starts to go dogga dogga with relatively little running. :shock:

    John
     

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