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What is this cylinder sleeve coated with?

What is this cylinder sleeve coated with?

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Old 11-07-2015, 06:10 PM
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Default What is this cylinder sleeve coated with?

It doesn't look like my other ABC cylinder sleeves. Any idea?


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Old 11-07-2015, 07:05 PM
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What engine is it from
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Old 11-07-2015, 07:05 PM
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Looks like nickel. Probably an old ABN motor (Aluminum piston, Brass sleeve, Nickel coated).
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Old 11-07-2015, 11:51 PM
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It's from an HPI Nitro Star .12R SS.

It doesn't look like nickel plating. I own a couple nickel-plated items and it looks shinier than this when polished, and when tarnished it has a distinctly brown color whereas this looks grey with the slightest hint of purple. (my camera didn't do a good job of showing that.) Also, I have the engine and a spare cylinder for it, and they both look exactly the same, which says to me that the current color is not the result of tarnish, because if it were there would be some amount of variation between the two.

That's not to say it isn't nickel-plated, it just doesn't look like I would expect nickel-plating to look.
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Old 11-07-2015, 11:53 PM
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Hmm. Now that someone mentioned nickel-plating, I thought to search for that term, and it turns out it's actually a nickel-silicon-carbide coating. Man, I bet that stuff takes a long time to wear down.

http://www.angelfire.com/falcon/hpi_...st_engines.htm
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Old 11-08-2015, 12:22 AM
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It is called Nicacil and it is not that strong compared with Chrome. Nicacil has a lower friction and should be a better choice but for our pistonring less engines it is too fragile
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Old 11-08-2015, 04:16 AM
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Ah. Hmm. Well, at least the coating has no edges where it can start to chip off. I guess we'll see how it holds up.
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Old 11-09-2015, 12:18 AM
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it will peeled off easily, compared with chrome one
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Old 11-21-2015, 06:14 PM
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Good to know.....
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Old 12-20-2015, 01:46 AM
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Interesting tidbit from an archived copy of the HPI FAQ:

"The new coating and the use of an oil ring in these engines means that they feel as though they have low compression when there is no fuel in the engine. When a compression gauge is put on these engines, it will only register 40-50 psi. However, when oil is added to the engine so that the oil ring is filled the compression will jump up to 65+ psi. We are having a number of these engine sent in (about 3-4 per week) where the customer is reporting that the engine has no compression. When we test them, we find that the compression is well within tolerances and that when the engine is ran, it shows no sign of having a worn piston and sleeve. In addition, the coating on the sleeve has a silicon coating that makes it more slippery than chrome, so it doesn't feel like it has as much 'pop' even though the compression is still good."
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