Thread starter Chris Long Start date Nov 20, Chris Long Member. Nov 20, Joined Jan 17, Messages 33 Likes 0. This is a general question regarding all 2 strokes even though my example is a minnie.
My Suzuki RM80 cylinder is at the shop and he wants to bore it due to scoring. Correct me if my wrong, but I thought all 2 strokes are plated and need to be re-plated and not bored.
He referred to my RM head as "old school" and they were not plated bac then. Any help would be appreciated and I will call the guy back. Thanks, Chris. Joined Jan 14, Messages Likes 0. Anymore and you will lose too much thermal efficiency, so they sleve the cylinder with a cast-iron barrel. The motor will run hotter too. Joined Apr 18, Messages 1, Likes 8. Not all cylinders are plated. It has become common on the newer models, especially in the larger engines.
On the plated cylinders, the plating is very thin. If the cylinder has been scored then re-plating may not be enough to fix the gouge. In this case the cylinder would need to be bored out and then plated. If the cylinder has been bored out as far as it can go then they insert a sleeve inside, which then gets bored to size and then plated. Joined Aug 13, Messages Likes 5. Power is not maxed, but the chrome rings last longer in an oil poor environment that is encountered in a two stroke.
In a four-stroke engine, I can't see why anyone would recommend chrome rings in a nickasil bore? Who recommended this and why? This time I want to use BRC, they come highly recommended and in general I'd rather work with companies that haven't been bought out recently, not that there's anything wrong with JE. Hsutton might have a point, would it matter to use a thinner ring in such a 'mild' engine? The 4. Custom rings would allow the highly recommended TiN coating to be used. That would be wonderful but what if I want tear it down one weekend and slap a set of rings in?
Maybe a common ringset would be pleasant to live with? Q-Ship, thanks for explaining. Nobody has recommended chrome rings specifically in a 4 stroke but in general there's probably not a good understanding of their characteristics, well among some of us at least. Post by David Redszus » Wed Nov 28, am I have a little trouble understanding why anyone would Nikasil a cylinder liner that wasn't aluminum. When Mahle the piston mfg invented the Nikasil process which is a plating of nickel and carbide particles it was applied to aluminum bores in order to obtain wear resistance.
Nikasil does not hone very easily. Consequently, most Nikasil bores are much too smooth and do not have the necessary grooves to contain oil. That being the case, the ring must be able to resist the consequences of inadequate lubrication. The engineering solution is to use a cast iron ring which is self lubricating or some filled ring moly.
Not chrome or steel. If the ring is too hard, the bore will wear. It will get a new Wossener piston too unless there is some reason not to?? There will be more heat expansion on this setup than would be the case with a water cooled cylinder, and it's a 2 stroke of course, but what are the advantages of a Nikasil lining for this application? I will probably be riding trails most of the time rather than trials for whatever that is worth.
So is the Nikasil worth it for an air cooled TY A?? PowerSeal USA offers a choice of upgrade and repair solutions for these. This technology has saved many cylinders that are worn beyond available overbore piston sizes. If the nikasil is applied to an all-aluminium cylinder, then heat transfer is better and it is lighter than with a cast iron sleeve design. In your case however, you would be applying the nikasil to the cast iron sleeve, so you would not get those benefits that nikisil can provide.
If your cylinder was worn beyond the size of the biggest oversize piston you can get, then nikasil would be a good option compared with resleeving. I do not have a bore gauge, but my telescoping gauges and micrometers are fairly accurate.
From what I could measure the new cylinder was still at nearly a stock size. There was a "lip" at the top of the cylinder that you could feel, and this and the taper of the whole sleeve inside may cause them to take it out one or two sizes to get it straight again. But since I am a complete beginner at the whole idea of Nikasil and what it can do and what it is best used for, I thought it would be a good idea to find out as much as I could about the process and get everyone's opinion.
So now I see that it can be applied to either the cast iron liner or for other bikes with just aluminum cylinders it can be used to improve the hardness and durability. Sounds like a must have for those situations where there is no cast iron liner for sure. The problem was, you had to bed the motor in for miles or so by which time the pistons needed replacing. The BEST motor we had, was a that was made up from 2 Nicasil motors that had each seized up one barrel. WinstonSmith New member. What is WRX?
I just don't understand what this product is and what it us supposed to do. Wrx I think is a Subaru car. Not sure what they were using for a coating. Sorry to burst you're bubble but nikasil work's great on iron liners DAP T60 rotary probably before you're time. The motorcycle industry have been nikasiling engines with steel cylinders since maybe earlier??? The reason you would plate an industrial engine is very simple, it gives you an immediate HP gain and virtually eliminates your cylinder wear and overbore problems.
Instead of boring cylinders, you just have to replace a piston occasionally if you use good oil, about every 5 years. It's also very hard to recognize on a steel liner and I'll bet that more than one has made it past tech without being recognized. CarlsonMotorsports Member. It was a Nikasil plated steel bore engine. Loved the burnished cylinder finish and low drag of that engine as well. I honestly don't know what the limits of boring a genuine Honda is.
We have re-sleeved them, but weren't doing it to see how big we could go.
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