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Post by 190mech on Dec 16, 2015 20:35:01 GMT -5
I dont have much on hand nikasil experience other than a bunch in my cylinder pile and a lot of reading,Its a super hard,thin coating over a honed aluminum bore.If we have grooves in the cylinder,the soft aluminum has been displaced and the hard nikasil has been forced into the grooves.Hard material is not flexible like soft stuff,,My thinking is the nikasil now has vertical cracks where it was forced into the grooves,maybe microscopic,but a future failure point for sure!What would I do?Buy a cheap piston and run the crap out of it!If it fails,oh well,it was fun while it lasted,,if it runs for years,well we all learned to do this again!!!  |
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Post by spaz12 on Dec 16, 2015 20:52:12 GMT -5
I read the article Frank and the little bit it talked about the nikasil cylinder didn't really scare me. He mentioned the differences in the quality of the plating. I would think that Malossi probably uses a better quality plating? And he didn't talk about anything catastrophic with the nikasil cylinder, just excessive oil consumption. I could be wrong I guess, but I don't see anything catastrophic happening by running it. I see a shorter piston and ring life though, assuming it makes enough compression.
And a little side note: I can only feel 6 of those grooves with my finger nail and only one of them with the pad of my finger. The camera really magnifies the grooves I would say.
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Post by spaz12 on Dec 19, 2015 20:30:17 GMT -5
I got the piston today from Ryan. Fits like a glove and even the boost port window lines up. I'm thinking that the piston is the same as the original, minus the chrome rings.
Anywhoo, it travels up and down the bore nice and smooth, so I'll fit it to a motor later and get a compression test done on it.
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Post by spaz12 on Dec 19, 2015 22:34:07 GMT -5
Haha, I have no cylinder studs! Dammit man! lol I'll go get some Monday or Tuesday.
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Post by FrankenMech on Dec 20, 2015 0:36:28 GMT -5
Just use nylon zip ties, then post a picture to the 'There I Fixed It' website.  |
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Post by spaz12 on Dec 23, 2015 19:35:28 GMT -5
Went to scrappy's and they didn't have the studs  I'll pull the one's that I have for a LC cylinder, but I'm thinking they're too short? I'll update again as soon as I get some if these don't work. |
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Post by spaz12 on Jan 4, 2016 22:33:37 GMT -5
So, I put the cylinder on the motor with studs that are from my lc cylinder. They are too short so I was afraid to torque them down. Couldn't use the kick starter either. Long story... So I used my drill on high speed and I'm thinking that it's about as good as the electric starter?
Anyway, I got a 130 psi the way it's setup. Light coating of oil on the cylinder walls.
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Post by spaz12 on Jan 4, 2016 22:57:09 GMT -5
Didn't use a new rubber head gasket either. Not sure if that would of made a difference, or not?
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Post by Clank on Jan 5, 2016 3:15:43 GMT -5
Oven cleaner is used to remove anodizing from aluminum and not damage the aluminum. Old trick I learned some 20 years ago bmxing. Got purple parts, sprayed then with oven cleaner, washed in warm soapy water, took to bench grinder with buffing wheel and compound, made shiny like chrome.
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Post by spaz12 on Jan 5, 2016 3:21:17 GMT -5
Yeah, the oven cleaner I had didn't do squat to get rid of the aluminum. The acid got it after a while.
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Post by Clank on Jan 5, 2016 3:24:37 GMT -5
What about scraping it out with a copper spoon?
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Post by spaz12 on Jan 5, 2016 3:28:22 GMT -5
It's all out now.Was just worried about the compression, but I've found a thread on nothing but the MHR Rep's and mine seems to be just fine compression wise.
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Post by Lucass2T on Jan 5, 2016 5:18:10 GMT -5
This is how thick a nicasyl layer is Cylinder is a 47,6mm Polini Evo  |
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Post by spaz12 on Jan 5, 2016 5:39:20 GMT -5
This is how thick a nicasyl layer is Cylinder is a 47,6mm Polini Evo That's thicker than I thought it was. I was thinking super thin. |
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Post by Lucass2T on Jan 5, 2016 8:21:46 GMT -5
This is how thick a nicasyl layer is Cylinder is a 47,6mm Polini Evo That's thicker than I thought it was. I was thinking super thin. To be honest...i thought that too. I thought it was only a few microns thick  Probably read something like that somewhere sometime... But this cylinder...the guy had his ported cylinder replated at some company (dunno which one, but i highly doubt it was a mass production plant) and maybe they use a thicker layer than they do at those factories where cylinders are mass produced (athena or gilardoni plant). |
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Probably read something like that somewhere sometime...