For casting cylinders fresh, LM13.
2024 if you want to machine a piston from solid.
For casting cylinders fresh, LM13.
2024 if you want to machine a piston from solid.
plus 10....
https://www.wakefieldmetals.co.nz/wp...0/roundBar.pdf
they do tubes in f-grades that suit , but not in the size someone wanted....
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Kinky is using a feather. Perverted is using the whole chicken
Lugging my hair yesterday, dynoing the Kartengine.
Well, it all falls in place in the end![]()
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:O
Kawasaki is coming out with a new full sized 2 stroke dirtbike. Last year of production was 2007 for their KX line.
Some interesting info in here.
Kr250
https://www.classicracer.com/classic...-tandem-twins/
Exactweld
https://www.classicracer.com/gorgeou...actweld-story/
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Kinky is using a feather. Perverted is using the whole chicken
Cylinder back from NZ Cylinders.
Photo #1 instruction sheet says Motul Kart synthetic castor for pre lube..
This is something that Millenium struggled with for years and are still getting shit poked at them even now.
They keep getting random " streaking " up the bore at the first heat cycle - nothing to do with port edges.
If you use a ton of castor based oil on the bore/piston , and DO NOT rev or blip the throttle for at least 5 minutes of just slow first start idle, this does not happen.
The heavy compression induced ring bore tension is reduced doing this initial break in procedure and bore streaking created by micro ring face particles being torn off - goes away.
It looks bad when you see it , but not long into normal use it will quickly wear off.
Ive got a thing thats unique and new.To prove it I'll have the last laugh on you.Cause instead of one head I got two.And you know two heads are better than one.
I have seen so much shit poked at them over this that I had decided to go to PowerSeal for their Nikaseal plating instead of Millenium.
Thankfully the engine manufacturer my team has been working with in China has accepted the need to convert from chrome plating to "Nickel Silicon Carbide" process.
So far it appears they have found a facility to shop out the plating too until I can convince them to ditch their in-house chrome process completely and setup for Ni-Sic plating like they ought to be doing...
I sent them a few Chinese language patents, I dont get whats so difficult about it![]()
The facility they are shoping out too claims they purchase the Sic powder straight from Germany, which at least sounds promissing.
Once the first batch of "nika-whatever" coating cylinders get here I'll have some pistons made up for 1.0mm chrome face rings and see what happens.
.........China?
The coating chemical process , can be easily adjusted technically to achieve a wide range of surface hardness values after final honing.
PowerSeal errs very much on the hard side , and thus receives big reps as though their process is " superior " because they don't suffer anywhere near as badly from initial streaking
up the bore during the first break-in heat cycle.
But in realty, of course , there is never a free lunch , and the harder honed surface immediately wears the coated ring face , and thus the longer term seal efficiency much, much faster.
Swings and roundabouts, where they sacrifice good long term ring seal , for short term perceived superior coating performance.
It is in no way superior at all - if the simple, correct break in process is adhered to, and then the so called shit plating performs perfectly in long term reality.
Ive got a thing thats unique and new.To prove it I'll have the last laugh on you.Cause instead of one head I got two.And you know two heads are better than one.
Thank you for sharing the empirical experience Wayne.
The process itself is simple enough to understand in principle...
But as I got deeper into what happens when you hone the cylinder, and how the coating has certain parameters that are tuned to work in conjunction with the method of honing, the ability to effectively determine the best solution quickly exceeded my pay grade.
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