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Everything Dirt Bike
General Dirt Bike
Nikasil Vs. Steel
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<blockquote data-quote="SRAD97750" data-source="post: 130219" data-attributes="member: 425"><p>We’ll start off with this…</p><p>Nikasil has better friction properties allowing the engine to spin easier. It also has far greater heat dissipation properties. This is especially important in watercooled engines where getting the heat into the water is crucial.</p><p> </p><p></p><p>Maybe in dirtbikes, but every sportbike I have ever overhauled has had steel liners. Even my 2005 SV1000 had steel.</p><p>Sportsbikes put the high performance dirtbike engines to shame. My 1993 GSXR 750 has 14:1 compression, 15K rpm, 175+hp/1000ccs. Versus a 2013 YZ450F which is 12.5:1 compression, 10K rpm, and 115hp/1000ccs. Why does a 20 year old bike outperform a brand new ‘high performance’ machine? Also, why do sportbike engines go 50-75K miles before ring changes? That's the equivalent of 1100hrs for 1 ring change.... </p><p> </p><p></p><p>Read on…</p><p></p><p>I think you mean Galling. <a href="http://en.wikipedia.org/wiki/Galling" target="_blank">http://en.wikipedia.org/wiki/Galling</a></p><p>Which will NEVER happen if you use proper lubricants in your engine.</p><p> </p><p> </p><p>Let's do a side by side $$$ comparison of the two types of cylinders, in 2 different instances.</p><p>Constants</p><p>-Piston rings last 100 Hrs</p><p>-Bore Job $40</p><p>-1000 hour time frame</p><p> </p><p>Situation #1</p><p>Perfect maintenance, perfect break in, ridden easy. No intake issues. No cylinder damage.</p><p> </p><p>Nikasil</p><p>-1 Coating lasts 10 sets of rings (1000hrs)</p><p>Total $275/1000hrs</p><p> </p><p>Steel</p><p>-Needs boring every 3 sets of rings</p><p>-Liner accepts 4 (0.5mm) bores. Pistons commonly available up to +2.0mm</p><p>-3.33 bores in 1000 hrs (we'll call it 4 and resleeve anyway)</p><p>-1 sleeve costs $150 installed professionally</p><p>Total $282/1000hrs</p><p> </p><p>Situation #2</p><p>Perfect maintenance, perfect break in, ridden easy. At the 410 hour mark, an unnoticed crack between the filter and carburetor allows sand to enter the engine unfiltered. Serious cylinder scratching found at the 5th ring change(500 hrs). No other damage noted. Intake problem corrected before engine is run again.</p><p> </p><p>Nikasil</p><p>-2 coatings occur within 1500hrs. One at 500hrs and again at 1500hrs provided nothing else goes wrong. Even the smallest nick requires full replating.</p><p>-Total $412.50/1000hrs (Pro rated)</p><p> </p><p>Steel</p><p>-1 bore prior to cylinder scratching (300 hrs) $40</p><p>-1 bore at 500hr mark instead of 600hr mark $40</p><p>-2 borings to get to 1100hrs $80</p><p>-1 sleeve at 1100hrs $150</p><p>Total $310/1000hrs</p><p> </p><p>*****************************</p><p>Situation #1 Nikasil is cheaper by $7</p><p>Situation #2 Steel is cheaper by $102.50</p><p>*****************************</p><p> </p><p>So in a perfect world, Nikasil is an awesome cylinder plating that transfers heat more efficiently. Also, it won't break the bank any worse than a steel sleeve will.</p><p> </p><p>IF ANYTHING GOES WRONG, ever, your fault, not your fault, act of God, improper maintenance, overlooked item....</p><p>Nikasil starts to add up in a big way. Steel is cheaper by 25% or more if you live in the imperfect world that I do.</p><p> </p><p>All I have to say is, don't go out of your way to sleeve a previously plated cylinder. It's designed to react with the coolant in a certain manner and steel may possibly impede that heat transfer slightly. But, neither is inferior... -BIG DAN<img src="https://www.dirtbikeaddicts.com/static/images/smilies/thumb.gif" class="smilie" loading="lazy" alt=":thumb:" title="Thumb :thumb:" data-shortname=":thumb:" /></p></blockquote><p></p>
[QUOTE="SRAD97750, post: 130219, member: 425"] We’ll start off with this… Nikasil has better friction properties allowing the engine to spin easier. It also has far greater heat dissipation properties. This is especially important in watercooled engines where getting the heat into the water is crucial. Maybe in dirtbikes, but every sportbike I have ever overhauled has had steel liners. Even my 2005 SV1000 had steel. Sportsbikes put the high performance dirtbike engines to shame. My 1993 GSXR 750 has 14:1 compression, 15K rpm, 175+hp/1000ccs. Versus a 2013 YZ450F which is 12.5:1 compression, 10K rpm, and 115hp/1000ccs. Why does a 20 year old bike outperform a brand new ‘high performance’ machine? Also, why do sportbike engines go 50-75K miles before ring changes? That's the equivalent of 1100hrs for 1 ring change.... Read on… I think you mean Galling. [URL]http://en.wikipedia.org/wiki/Galling[/URL] Which will NEVER happen if you use proper lubricants in your engine. Let's do a side by side $$$ comparison of the two types of cylinders, in 2 different instances. Constants -Piston rings last 100 Hrs -Bore Job $40 -1000 hour time frame Situation #1 Perfect maintenance, perfect break in, ridden easy. No intake issues. No cylinder damage. Nikasil -1 Coating lasts 10 sets of rings (1000hrs) Total $275/1000hrs Steel -Needs boring every 3 sets of rings -Liner accepts 4 (0.5mm) bores. Pistons commonly available up to +2.0mm -3.33 bores in 1000 hrs (we'll call it 4 and resleeve anyway) -1 sleeve costs $150 installed professionally Total $282/1000hrs Situation #2 Perfect maintenance, perfect break in, ridden easy. At the 410 hour mark, an unnoticed crack between the filter and carburetor allows sand to enter the engine unfiltered. Serious cylinder scratching found at the 5th ring change(500 hrs). No other damage noted. Intake problem corrected before engine is run again. Nikasil -2 coatings occur within 1500hrs. One at 500hrs and again at 1500hrs provided nothing else goes wrong. Even the smallest nick requires full replating. -Total $412.50/1000hrs (Pro rated) Steel -1 bore prior to cylinder scratching (300 hrs) $40 -1 bore at 500hr mark instead of 600hr mark $40 -2 borings to get to 1100hrs $80 -1 sleeve at 1100hrs $150 Total $310/1000hrs ***************************** Situation #1 Nikasil is cheaper by $7 Situation #2 Steel is cheaper by $102.50 ***************************** So in a perfect world, Nikasil is an awesome cylinder plating that transfers heat more efficiently. Also, it won't break the bank any worse than a steel sleeve will. IF ANYTHING GOES WRONG, ever, your fault, not your fault, act of God, improper maintenance, overlooked item.... Nikasil starts to add up in a big way. Steel is cheaper by 25% or more if you live in the imperfect world that I do. All I have to say is, don't go out of your way to sleeve a previously plated cylinder. It's designed to react with the coolant in a certain manner and steel may possibly impede that heat transfer slightly. But, neither is inferior... -BIG DAN:thumb: [/QUOTE]
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