piston install

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   Hey guys i need a little help. i am building a 350 for my 79 tique and when i instll the pistons something just does not seem rite. It is harder than it should be to rotate the crank. "i know how hard it should be"

i have found the source of the problem to be the oil scraper rings. If i take them off and put the piston in with just the other rings it is fine. I know the scraper rings should add some resistance but not as much as they are. 

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bwooton Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: June-13-2005 Location: United States Status: Offline Points: 91	Post Options Post Reply Quote bwooton Report Post Thanks(0) Quote Reply Topic: piston install Posted: October-23-2006 at 5:31pm
	Hey guys i need a little help. i am building a 350 for my 79 tique and when i instll the pistons something just does not seem rite. It is harder than it should be to rotate the crank. "i know how hard it should be" i have found the source of the problem to be the oil scraper rings. If i take them off and put the piston in with just the other rings it is fine. I know the scraper rings should add some resistance but not as much as they are.
	Thanks Bobby there's no replacement for displacement

79nautique Members Profile Send Private Message Find Members Posts Add to Buddy List Grand Poobah Joined: January-27-2004 Location: United States Status: Offline Points: 7872	Post Options Post Reply Quote 79nautique Report Post Thanks(0) Quote Reply Posted: October-23-2006 at 6:38pm
	do you have the piston 180 off ? are you building a rev rotation engine?

64 Skier Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: February-08-2004 Location: United States Status: Offline Points: 415	Post Options Post Reply Quote 64 Skier Report Post Thanks(0) Quote Reply Posted: October-24-2006 at 3:39am
	What is your piston to cylinder wall clearance?
	64 Skier 66" HO VTX and 67" HO Triumph 71CC

05 210 Members Profile Send Private Message Find Members Posts Add to Buddy List Platinum Member Joined: February-17-2006 Location: Southern Maine Status: Offline Points: 1481	Post Options Post Reply Quote 05 210 Report Post Thanks(0) Quote Reply Posted: October-24-2006 at 8:02am
	Check the end gap of the oil rings in the cylinder,maybe they are the wrong ones. Mike
	Air Nautique 210 Team 640 hours, not 1 regret

bwooton Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: June-13-2005 Location: United States Status: Offline Points: 91	Post Options Post Reply Quote bwooton Report Post Thanks(0) Quote Reply Posted: October-24-2006 at 2:47pm
	All the gaps are correct. I made special effort to check each one. the pistons are going back in just as they were removed. Same bore same direction. I will have to double check that piston to cylinder spec, but i am sure that it was within tollerance. I think my compressor may have something to do with it. It is the cheap type with two bands that you just tighten down. it does not seem to sit correctly over the bore. i am going to buy a different compressor and see if that does it.
	Thanks Bobby there's no replacement for displacement

eric lavine Members Profile Send Private Message Find Members Posts Visit Members Homepage Add to Buddy List Grand Poobah Joined: August-13-2006 Location: United States Status: Offline Points: 13413	Post Options Post Reply Quote eric lavine Report Post Thanks(0) Quote Reply Posted: October-27-2006 at 9:17am
	bwooton, got a hydraulic roller cam with 50 hours on it, will sell very cheap eric, came from a 280 5.7 eric just thought you might be interested i have the lifters and the broomstick
	"the things you own will start to own you"

piston install

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