Piston coatings

[bored&stroked]

I know in the automotive world they use coatings for various purposes, heat resistance for the dome and anti-friction for the walls/skirts being the two biggest things I can think of. I don't really see that in jetskis, I'm assuming there is a reason other then nobody wants to do it?

 

[Snowmobiler]

2 strokes in skis are still in the early 90's technology wise.

I would imagine it's a cost thing.

 

[Snowmobiler]

Latest 2 stroke tech.
Plasma coated cylinders.
Iron encapsulated piston rings.
Forged 1 piece crankshaft.
2 piece automotive style rods.
A conservative 165 hp out of an 850.

 

[speedysprocket]

My wiseco pistons are coated...


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[Pro-pulsion]

What are they coated with Speedy? I thought I've seen coated before too and seem to think nickasil.

 

[Lumpy]

What are they coated with Speedy? I thought I've seen coated before too and seem to think nickasil.

Doubt it was nickasil. I don't think they would be coated with anything harder than the sleeve as your pistons wouldn't wear and a new top end would consist of swapping sleeves. Just my two cents, I'm no expert.

 

[speedysprocket]

Teflon I guess. The sides are dark grey and the top is cast aluminum color, but a smooth texture from some kind of coating. They're made for a snow mobile...


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[Pro-pulsion]

Hmm, now I wondering if they used MolyKote. We used that stuff but it was called Mollydag on tire molds for the tread blocks. It resists very high heats and is not a permanent coating.. It's meant to be re-coated after so many hundred cycles of tire cures.

 

[Freakrider]

Hmm, now I wondering if they used MolyKote. We used that stuff but it was called Mollydag on tire molds for the tread blocks. It resists very high heats and is not a permanent coating.. It's meant to be re-coated after so many hundred cycles of tire cures.

Vertex pistons made in Italy state the skirts are Moly coated.

 

[MarkWalker]

Back in the 90's, I was a crew member on a Top Alcohol Funny car. We would use Swain Tech Coatings on the pistons and the headers. It worked well, the coated pistons looked way better after 5-10 runs. http://swaintech.com/

 

[bored&stroked]

Good info, thanks dudes.

 

[waxhead]

The market is not big enough for one thing, I asked Dan Lamey about it and he said that the nikisal does not like water. Not sure on that or not just what he said

 

[bird]

The market is not big enough for one thing, I asked Dan Lamey about it and he said that the nikisal does not like water. Not sure on that or not just what he said

Mercury Marine started using Nikasil on their outboards in the 80s. They then came up with Mercasil, which was not quite as good. I'm not sure what you're saying about water. Steel sleeves hate water too....

My 91 25hp Mercury still has 110+ psi in each hole. Nikasil motor with 1000s of hours on it.

 

[waxhead]

Mercury Marine started using Nikasil on their outboards in the 80s. They then came up with Mercasil, which was not quite as good. I'm not sure what you're saying about water. Steel sleeves hate water too....

My 91 25hp Mercury still has 110+ psi in each hole. Nikasil motor with 1000s of hours on it.

I’m not sure. I was only saying what Dan Lamey told me

 

[kevbo]

Latest 2 stroke tech.
Plasma coated cylinders.
Iron encapsulated piston rings.
Forged 1 piece crankshaft.
2 piece automotive style rods.
A conservative 165 hp out of an 850.

Yea but, can it make 100hp at 7000opm with a wet pipe? .

 

[Quinc]

Someone needs to make a pwc cylinder to fit on the polaris 850 engine already.

 

[Storbeck]

Someone needs to make a pwc cylinder to fit on the polaris 850 engine already.

You would need a way to put a drive coupler on the crank, and a way to attach an electric starter because in the sled it drives on the primary clutch.

Also it's a pretty heavy motor, quite a bit physically bigger and heavier than a typical 62t based motor.

What's wrong with the cylinder as it exists?

 

[Storbeck]

Also I'm pretty sure that bottom end is designed to work with oil injection and would have issues running premix, but not sure about that one.

 

[Quinc]

You would need a way to put a drive coupler on the crank, and a way to attach an electric starter because in the sled it drives on the primary clutch.

Also it's a pretty heavy motor, quite a bit physically bigger and heavier than a typical 62t based motor.

What's wrong with the cylinder as it exists?

I only pretend to be an engineer on the Internets; but I think you would need to change the cylinder porting significantly to get the power in the range needed for pwc. You can buy electric start kits for snowmobile engines. Backup pull starter would be interesting too.

Just need to add some threads or make a custom coupler. This one even has a turbo! Imagine a 850cc fuel injected 2 stroke engine with turbo in your waveblaster or superchicken.

 

[Pro-pulsion]

I only pretend to be an engineer on the Internets; but I think you would need to change the cylinder porting significantly to get the power in the range needed for pwc. You can buy electric start kits for snowmobile engines. Backup pull starter would be interesting too.

Just need to add some threads or make a custom coupler. This one even has a turbo! Imagine a 850cc fuel injected 2 stroke engine with turbo in your waveblaster or superchicken.

Drop an SL 780 crank in? That's an old Polaris twin pwc crank