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Old 04-24-2009, 10:10 AM   #1 (permalink)
swl
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Exclamation piston to wall clearance too small

I have a problem with my piston to valve clearance. I must add 0,018mm for the correct clearance. (was my own mistake not giving the pistons with the cyclinders for overboring)

Does anyone know if it is possible to do this without having to redo the nicasil walls in the cyclinders?


Help me, thanks!
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Old 04-24-2009, 11:05 AM   #2 (permalink)
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kinda amazing the shop did the work without the pistons...when i bored out my harley and built the engine they needed the pistons...its gonna have to be redone
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2003 ZX-6R: Leo Vince High Rise Carbon, Powers Race Rails with homemade extended sliders, Scotts Damper, HID Conversion 6000K, LED Integrator & LED Front Signals, Michelin Pilot Powers, PCIII, K&N Air Filter, Pazzo Shortys, Mirror Block Offs

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Old 04-24-2009, 11:28 AM   #3 (permalink)
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It was my own fault for not sending the pistons, i have found a shop whos going to try to rehone with diamondstuff. Hopes this works out.
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Old 04-24-2009, 11:41 AM   #4 (permalink)
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kinda amazing the shop did the work without the pistons...when i bored out my harley and built the engine they needed the pistons...its gonna have to be redone

+1 they need the pistons and they are honed specifically for each piston individually bc even though they look identical, they aren't...what ever they pick as #1-#4 will have the stay in the location (cylinder) it's honed for..
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Old 04-24-2009, 12:21 PM   #5 (permalink)
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i'm just interested now...you just show up with an engine block and say i need some holes bigger? and the size of the holes shouldn't make a difference in valve clearance that is determined by how high the piston goes up, the shape, and if you have had your head milled down
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Sitting in the garage and next: 05-06 wheels and swingarm

Last edited by SpaceCowboy; 04-24-2009 at 12:27 PM.
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Old 04-24-2009, 12:28 PM   #6 (permalink)
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i'm just interested now...you just show up with an engine block and say i need some holes bigger?

ya know I don't know why this is sooo friggin funny but it is...bc i guess they said, "oh ok sure!!"
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Old 04-24-2009, 01:28 PM   #7 (permalink)
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make fun of me eh? lol
i just said to them +1mm every hole because i bought wiseco +1mm. thats the story.
They asked for pistons, i asked why they need them for (i didnt know it was so strict) and they did the job and im stuck now.

Buuut i found a shop who can rematch them for me, i hope
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Old 04-24-2009, 02:42 PM   #8 (permalink)
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well you can always make holes bigger...sounds like guy at the shop was being a smart a$$ by doing that job...if he does that kind of work he knows that you need the pistons...what a dick move...

sounds like something that should be on FML.com

"I paid a shop to bore my cylinders to make my pistons fit and they did it without using the pistons and now they don't fit...i just wasted time and money...-FML"
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Old 05-26-2009, 03:26 AM   #9 (permalink)
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Quote:
Originally Posted by swl View Post
I have a problem with my piston to valve clearance. I must add 0,018mm for the correct clearance. (was my own mistake not giving the pistons with the cyclinders for overboring)

Does anyone know if it is possible to do this without having to redo the nicasil walls in the cyclinders?


Help me, thanks!
dude... u said 0.018mm.. that measurement sounds to tight to me... its not even 0.001 thousands of an inch.. its really tight... i think that u will have improper wear with that clearance .... way to tight i think... but who am i.. only a machinist...LOL
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Old 05-26-2009, 06:28 AM   #10 (permalink)
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i think the nicasil coating is only about 0.1mm - 0.15mm thick or about .004"-.006" they may be able to hone another .018mm from the bores.... thats less than .001" id say it can be done!
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