lq4 forged piston rock?Video
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lq4 forged piston rock?Video Well bought this motor to install last year on my previous car,but sold it and not till recently bought another car,replaced the ls1 with a lq4.I didn't even know it had forged pistons till I installed it lol.Well turns out as soon as it was started,it started tapping.My thoughts were well must be a lifter..So a 2 days ago pulled the heads inspected everything nothing unusual.Went off to buy new ls7 lifters,gaskets,etc.I decided to clean the top of the pistons a little and as I was cleaning the #1 piston it rocked left to right I was like this doesn't seem right.
So its my understanding that forged pistons need a little more piston to wall clearance?When engine gets to operating temp the pistons expands?My question is would the tap sound I heard be actually the piston or pistons rocking?Video I took sorry for the quality cell phone.
http://www.youtube.com/watch?v=xtZtwW4pElQ
So its my understanding that forged pistons need a little more piston to wall clearance?When engine gets to operating temp the pistons expands?My question is would the tap sound I heard be actually the piston or pistons rocking?Video I took sorry for the quality cell phone.
http://www.youtube.com/watch?v=xtZtwW4pElQ
Did You measure between that bottom ring land and the cylinder ? Pistons on the pin end sides only have that narrow part that is below the oil ring that is the same diameter as the skirt , the ring lands are between .030" and .050" narrower than the skirt and that narrow part below the oil ring on the pin end side . But that does seem a little excessive . Good luck fo sho .
