Engine building piston movement

1. sri_130 Frequent Poster Joined: Apr 2012 Doyncaster Posts: 783

   #1 2nd May 2017, 22:16

   One for the engine builders amongst the forum.
   On this cylinder, there is not great side to side movement of the piston. North to south, seems fine. The picture below is spun the wrong way, so the bottom and top are actually side to side in this case.
   The piston. Seems to prefer one side, slightly thus not as much movement as others, but not too horrific.
   
   I suspect the rod bush isn't level, as I had them machined. Question is, is this safe to run? The tolerance seems marginal, but having no experience at this section has made me anxious that not all are uniform.
   
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2. axsaxoman Saxperience Forum Bum Joined: Jan 2003 Scotland Posts: 3380

   #2 3rd May 2017, 09:56

   or rod bent--why did you have little end of rods machined ? maybe too loose a fit to piston pin
3. sri_130 Frequent Poster Joined: Apr 2012 Doyncaster Posts: 783

   #3 3rd May 2017, 13:41

   Quote:

   Originally Posted by axsaxoman or rod bent--why did you have little end of rods machined ? maybe too loose a fit to piston pin

   They were the smaller little ends, for kit car fit or something. There were a couple of types for sale at the time.
   
   
   
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4. Chipwizards Frequent Poster Joined: Nov 2009 Posts: 576

   #4 4th May 2017, 20:49

   Proper Kit car rods are light weight to cope with high revs (hence the small pins).
   For a turbo motor you need wide beams to cope with high cylinder pressures that otherwise cause bending, so I'm not sure they are a good choice anyway.