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Sportster Motorcycle Motor - Top End Discuss Sportster Motorcycle Top End issues. Rockerboxes, Valves, Cylinders, Pistons, Rings, Lift Rods, etc...

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  #1  
Old 4th January 2012
Foracer666 Foracer666 is offline
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Default ring gap question,

I am in the process of doing 883-1200 conversion. i am using the wiseco 9.5 comp dished pistons . i bought the jugs and pistons from a friend of a friend .
they are 883 jugs bored. so i ordered new hastings rings for the wiseco pistons. so they rings came in today and i was curious what the end gap is .
so i used one of the new pistons to center the new ring about a inch in the bore . and i am seeing .020" i spoke to the wiseco guy and he was saying he runs like .014. and then i was searching and found nrhs uses .018" so will i be ok with what i have ? will it cause any problems in my build? i am sending my stock heads to nrhs for the stage one and i am install n4 cams . any help would be appreciated .
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Old 4th January 2012
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Default Gap

Can anyone help?
I know there alot of very knowledgeable
People out there.
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  #3  
Old 4th January 2012
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Old 4th January 2012
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Rings are all made for a target bore size. Every .001" the bore is bigger than this target causes the ring gap to grow by just over .003". So a wide gap, on a set of rings that's supposed to be correct for the bore size, can easily be caused by problems with the bore. But I have no way of knowing if that's the case without making the measurements, and I'm certainly not saying that's what's going on here.

If it were me, I'd clamp the cylinders into torque plates, measure the bores, and measure the pistons, to see if the bores are straight and round and the correct size for the pistons. Only after I had confidence that was all correct would I make the call as to whether or not the gap was acceptable to me. If all that's right, and the gap was wider than what I want, I'd go get new rings.
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Old 4th January 2012
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As said above what is your piston to cylinder wall clearance while the cylinders are in torque plates? If you want to send me your cylinders and pistons when you send me your heads I will be happy to check that for you at no charge if you do not have torque plates available.
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Old 4th January 2012
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Quote:
Originally Posted by NRHS Sales View Post
As said above what is your piston to cylinder wall clearance while the cylinders are in torque plates? If you want to send me your cylinders and pistons when you send me your heads I will be happy to check that for you at no charge if you do not have torque plates available.




Ok that's prob my best way to go!! And if there's a problem I always
Have my stock jugs to bore. Maybe just sell the stuff I have and
Go with one of your 1250 kits.
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Old 4th January 2012
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Any of the above would be a good choice.
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Old 5th January 2012
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Default Ring gap

So riddle me this .

I decided to check the gap for the second ring.
Now this a brand new set from wiesco.
The second ring I can barely fit a feeler gauge in between
It . So do I have a faulty top ring. Measured in both
Cylinders is like .019-.020.
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  #9  
Old 5th January 2012
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I would take Dan up on his offer to check everything for you.
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Old 5th January 2012
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Originally Posted by Tattoo Tony View Post
I would take Dan up on his offer to check everything for you.
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