Maintenance & Technical > KX500 Original

Interesting read on sleeves

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demographic:
So the fact that you can run tighter piston to bore clearances with plated bores, that steel doesn't transmit heat quite as well as aluminium and the fact that Formula one racing cars use plated bores (lets face it the F1 boys don't give a toss about the price difference do they) doesn't make any difference to his arguement?

What was he selling again?

2001KX5:
I mean there is def. some bias in the article as he is interviewing dude from LA sleeve, but at least transworld does some decent articles from what I have read.

The thing that made me question it was when he spoke of the heat transfer to the sleeve.  It one thing to say that, but you should back it up with facts to prove it imo.  Perhaps the  materials they are using in the sleeve actually have decent heat transfer #'s..... I dunno.

As for the F1 cars, well I mean they are limited in HP so power to weight ratio means every thing. Imagine how much weight 12 cylinder sleeves would add.  Much more weight than they can find to shed off the cars no doubt so take it all for what its worth. And I'm just playing devils advocate here as well so don't shoot me.

I would love to see some power #'s of sleeved motors vs  plated motors. I may try to run my 500 on a dyno the summer, but we'll see.

And you know, talk to 100 different people and you will get a 100 different stories.  While I don't race or hold WOT for long periods of time I still ride it for what its worth.........well, for what I'm worth lol, so I think a sleeve will do just fine.

gowen:

--- Quote from: KXcam22 on March 15, 2006, 02:31:11 AM ---I'm not sure which I like better but there are some things in the writeup that don't sound right to me. First, a steel liner can't transfer heat as quickly as plated aluminum, It's simply a property of the metal.  The crosshatch thing may be true but the coeffccient of friction is lower for nikasil than steel which should mean more HP and less heat. Just my 2 cents. Cam.

ps. In my locale I have to ship the cylinder 1000 miles to get replated but can get it bored down the street.

--- End quote ---

I thought so too Cam. I could smell a stink.

John:
I was gearing myself up for a massive response and I figured... what's the use?

Everyone is entitled to their own opinion. Mine is 100% with coating. Having the same material in the piston and cylinder walls (bar the coating) will at least allow for the same heat expansion. My personal experience is that minor sizes can be fixed when you have a nikasil coated cylinder; this is not true with sleeves.

FYI, I found a lot of information on the net about this but failed to find a definitive (authoritive) source that could claim one or the other to be true.

I think this is a very good subject for a murky, rainy day at the pub, not sure we can solve it here in this forum.

Cheers!!

//John

duudu:
What you said about sleeves is true, i am also a kart racer and i have never seen a 100 cc kart engine that has nikasil, my engine puts out about 38 hp and does 22k rpm,engine life is one weekend which means half hour of practice and break-in one qualifycation race and 2 heats :D, will send my kx engine to eric gorr as i see you all respect him and he does a pretty good job. Sorry about divagating from the subject

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