ktm replica (liquid cooled)

[gary55]

I'm still confused as to how water lengthens the ride, I don't think you fixed the dilemma..

Boats should run forever with that ocean or lake worth of engine cooling... Yet we still have to drag the damn things out of the water to refuel all the time... Maybe it's the yamalube...

Take the 66cc china girl and mod. it to it's max potential, which still will not be as strong as the 49 cc water pumper. then run the two under high heat and loads continuously. Which one do you think will fail first? If your talking about having to stop for fuel look at my tank. How long do you think my engine would last running it hard till this tank was empty. It wouldn't bother the water cooled engine.

 

[Street Ryderz]

I'm still confused as to how water lengthens the ride, I don't think you fixed the dilemma..

Boats should run forever with that ocean or lake worth of engine cooling... Yet we still have to drag the damn things out of the water to refuel all the time... Maybe it's the yamalube...

And they do!My modded 25 merc outboard produces over 30 hp and can run all day at w.o.t and never over heats!My sons rm 65 lc can run 40 min mains screaming high rpm's no problem!The quality of the components and design of these engine allow for much greater power output and still maintain reliability far greater than a china girl!And no matter how well you have modded and set up your china girl if you run it at over 9000 for 40 min your taking that engine home in a box!Trust me I have tried it and didn't get 40 min the temp went above 400 f lost power then spit two roller bearings from wrist pin bearing!

 

[Frankenstein]

I tried running my bike underwater to simulate water cooling but I think I broke it.

 

[gary55]

I tried running my bike underwater to simulate water cooling but I think I broke it.

What would Lloyd bridges do?

 

[Frankenstein]

What would Lloyd bridges do?

Build a bridge and not destroy his electrical system? Or edit the shot...

 

[Steve Best]

Does a nikasil coating allow for hotter safe running temps? Does it cause the piston and cylinder to hang onto heat longer than a thin chrome?

Is there a major expansion difference between the aluminum cylinder and piston and the ceramic coat that you know of, meaning they could expand at different rates and cause the plating to flake off?

How much longer do you think a happy time motor with a coating like that could survive compared to a normal set up. What about the longevity compared to a liquid cooled motor with normal chromed surfaces.

Nikasil is very tough, I've never had a problem with flaking on KTM, Husaberg and Yamaha motors.
There are no expansion issues with Nikasil and the aluminum cylinder.
It is not a ceramic and I don't know of ceramic cylinder coating. Ceramic paint for on the outside exists.
The aftermarket nikasil replating is usually much thicker and tougher than the original manufacturer's plating.

My only previous experience with chrome plating was with 1970s air cooled snowmobiles.
They had some big advantages over iron cylinders, cooled better and less detonation prone and less friction.
The chrome was much thicker but was prone to blistering and separating from the aluminum.

A nikasil coating on these cylinders would substantially improve their life and heat tolerance and allow 50:1 oil.
Liquid cooling does not necessarily increase the life of an engine, it limits temperature fluctuations that can improve reliability and life. Sounds like a lawyers answer and it is. There are no absolutes.

Marine outboards can run all day in part because of the unlimited cooling, but largely because of light cylinder loading. My 7.5hp was about 200cc IIRC, whereas a 200cc Yamaha Blaster makes 17hp in its detuned state, 25-35hp with light mods . My 18hp Evinrude was about 360cc. My 300KTM makes about 55hp, a considerable difference in power output per cc.

I did run my modded 48cc China Girl full tilt 9000rpm for many 20-100 kms trips. It withstood it quite well, but did fatigue a piston wristpin circlip at about 1600 kms and wristpin and bearing were pretty much worn by then.

If I were building an engine for maximum power and durability, I'd choose liquid cooled nikasil as all the MX bikes have done. No question about it.

As for water extending the ride, I found that to be true back in the day of waterbeds, mainly due to 4 stroking.
One power stroke and 3 riding the waves...

 

[Frankenstein]

Nikasil is very tough, I've never had a problem with flaking on KTM, Husaberg and Yamaha motors.
There are no expansion issues with Nikasil and the aluminum cylinder.
It is not a ceramic and I don't know of ceramic cylinder coating. Ceramic paint for on the outside exists.
The aftermarket nikasil replating is usually much thicker and tougher than the original manufacturer's plating.

My only previous experience with chrome plating was with 1970s air cooled snowmobiles.
They had some big advantages over iron cylinders, cooled better and less detonation prone and less friction.
The chrome was much thicker but was prone to blistering and separating from the aluminum.

A nikasil coating on these cylinders would substantially improve their life and heat tolerance and allow 50:1 oil.
Liquid cooling does not necessarily increase the life of an engine, it limits temperature fluctuations that can improve reliability and life. Sounds like a lawyers answer and it is. There are no absolutes.

Marine outboards can run all day in part because of the unlimited cooling, but largely because of light cylinder loading. My 7.5hp was about 200cc IIRC, whereas a 200cc Yamaha Blaster makes 17hp in its detuned state, 25-35hp with light mods . My 18hp Evinrude was about 360cc. My 300KTM makes about 55hp, a considerable difference in power output per cc.

I did run my modded 48cc China Girl full tilt 9000rpm for many 20-100 kms trips. It withstood it quite well, but did fatigue a piston wristpin circlip at about 1600 kms and wristpin and bearing were pretty much worn by then.

If I were building an engine for maximum power and durability, I'd choose liquid cooled nikasil as all the MX bikes have done. No question about it.

As for water extending the ride, I found that to be true back in the day of waterbeds, mainly due to 4 stroking.
One power stroke and 3 riding the waves...

Interesting. Very interesting you say that nikasil isn't ceramic. I forgot some of my chemistry, but Chem was never really my strong suit. How could I forget my favorite Latin phrase's most important element.. Carborundum! For some reason I was reading silicon carbide but brain was telling me silicon nitride...

Cool none the less. I could see that stuff lasting a long long time.

You must have had a damn good frame to handle a 4 stroke on a waterbed mattress. Back when bed frames were built to handle extra chain and leather accessories, they just don't make them like they used to...

 

[gary55]

Nikasil is very tough, I've never had a problem with flaking on KTM, Husaberg and Yamaha motors.
There are no expansion issues with Nikasil and the aluminum cylinder.
It is not a ceramic and I don't know of ceramic cylinder coating. Ceramic paint for on the outside exists.
The aftermarket nikasil replating is usually much thicker and tougher than the original manufacturer's plating.

My only previous experience with chrome plating was with 1970s air cooled snowmobiles.
They had some big advantages over iron cylinders, cooled better and less detonation prone and less friction.
The chrome was much thicker but was prone to blistering and separating from the aluminum.

A nikasil coating on these cylinders would substantially improve their life and heat tolerance and allow 50:1 oil.
Liquid cooling does not necessarily increase the life of an engine, it limits temperature fluctuations that can improve reliability and life. Sounds like a lawyers answer and it is. There are no absolutes.

Marine outboards can run all day in part because of the unlimited cooling, but largely because of light cylinder loading. My 7.5hp was about 200cc IIRC, whereas a 200cc Yamaha Blaster makes 17hp in its detuned state, 25-35hp with light mods . My 18hp Evinrude was about 360cc. My 300KTM makes about 55hp, a considerable difference in power output per cc.

I did run my modded 48cc China Girl full tilt 9000rpm for many 20-100 kms trips. It withstood it quite well, but did fatigue a piston wristpin circlip at about 1600 kms and wristpin and bearing were pretty much worn by then.

If I were building an engine for maximum power and durability, I'd choose liquid cooled nikasil as all the MX bikes have done. No question about it.

As for water extending the ride, I found that to be true back in the day of waterbeds, mainly due to 4 stroking.
One power stroke and 3 riding the waves...

The only time I experienced this particular 4 stroking issue was back when I was running with a rich girl.

 

[Steve Best]

Nikasil is a nickle electro-plating process in a silicon carbide suspension where the silicon carbide gets trapped in a matrix of nickledeposited on the aluminum cylinder bore.

 

[Frankenstein]

Nikasil is a nickle electro-plating process in a silicon carbide suspension where the silicon carbide gets trapped in a matrix of nickledeposited on the aluminum cylinder bore.

Yes I know that, I was reading carbide but my brain told me I was seeing nitride, which is ceramic, carbide of silicon is what nikasil is.

Basically I thought it was a ceramic coating because I was thinking something else.

The only time I experienced this particular 4 stroking issue was back when I was running with a rich girl.

That's not called having an issue, that's called an experience.