Scaratches on pistonīs and sleaves.... WHY ???
#21
What did you hone that block with? If you used a drill and a hone, it looks like you went too fast with it and didn't use an up and down motion. I don't see any crosshatching.
In any case, the block looks like the cylinder walls are now out of round. You could probably have it machine honed with more precision and get the surface looking better. At this point though, you would need oversized pistons. Better do it right than to just throw everything back in there.
In any case, the block looks like the cylinder walls are now out of round. You could probably have it machine honed with more precision and get the surface looking better. At this point though, you would need oversized pistons. Better do it right than to just throw everything back in there.
#22
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What did you hone that block with? If you used a drill and a hone, it looks like you went too fast with it and didn't use an up and down motion. I don't see any crosshatching.
In any case, the block looks like the cylinder walls are now out of round. You could probably have it machine honed with more precision and get the surface looking better. At this point though, you would need oversized pistons. Better do it right than to just throw everything back in there.
In any case, the block looks like the cylinder walls are now out of round. You could probably have it machine honed with more precision and get the surface looking better. At this point though, you would need oversized pistons. Better do it right than to just throw everything back in there.
and should i let the mahcine shope hone it to 4.010 or can it be bored .005 out
would a 4.020" not be bit to much for the LS2 donīt wante to loose the strength out the block, plans are NOS...
#23
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Those marks should come out at .005 more. You should be able to have your machine shop check the bore size, if it measures under 4.0075 in the shadow it should clean up. No problem for that low amount of material to be honed out with a Sunnen CK type machine.
Kurt
Kurt
#24
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I had the same problem. 4.000 stroke Callies Compstar crank in a 383 LS1. Measured my piston to wall clearance at over .007" when the piston calls for .0025" The engine had less than 5k miles and had horrible piston slap knocking so I tore it down and found this.
https://ls1tech.com/forums/generatio...clearance.html
https://ls1tech.com/forums/generatio...clearance.html
Last edited by 89L98T56; 10-01-2010 at 12:47 AM.
#25
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I had the same problem. 4.000 stroke Callies Compstar crank in a 383 LS1. Measured my piston to wall clearance at over .007" when the piston calls for .0025" The engine had less than 5k miles and had horrible piston slap knocking so I tore it down and found this.
https://ls1tech.com/forums/generatio...clearance.html
https://ls1tech.com/forums/generatio...clearance.html
wow.... i see iīm not the only one here unlucky....
Wiseco 4.010" pistons what should the blockīs bore size be at.
Should the bore size be 4.0100" accurate ?
wouldnīt it be smarter to purchase the pistons first and then bore the block out whith the piston on hand to get it 100% right...
should the clearence be .002-.004 there too.
Baezi
#26
FormerVendor
Wiseco has no shelf pistons at 4.010 but they will do a custom. I would hone it to get round first if you want those shadows gone and then order pistons when you know what will clean up.
#28
Looks like someone doesn't know SHEEET about fitting pistons! NOWAY fuel washed away .0075..............off each pistons EQUALLY and PERFECTLY. Face you got hosed! Go do it yourself this time and do it right. Find a good machine shop and YOU inspect the work before it gets put together. BE SURE to follow the piston manufacturer clearance specs.
#29
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Looks like someone doesn't know SHEEET about fitting pistons! NOWAY fuel washed away .0075..............off each pistons EQUALLY and PERFECTLY. Face you got hosed! Go do it yourself this time and do it right. Find a good machine shop and YOU inspect the work before it gets put together. BE SURE to follow the piston manufacturer clearance specs.
fuel does not wash away the metal, fuel washes away the oil coating on the cylinders and pistons, then the piston has nothing to ride on, and destroys the cylinder wall and piston.
#30
Perfectly in every cylinder BULL SHEEEET
#33