Maintenance & Technical > KX500 Original

Dry piston install

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slow600:
no oil go boom is not really a strong argument, ive built dozens of engines with no boom yet. i based my opinion off talking to top engine builders, not just average joes (not intended at muleman). granted they were all 4strokes so the kx might be different. manual does state oil on cylinder wall, however if everyone followed the factory manual there would be no performance builders at all. the rings will have immense heat generated as soon as it starts moving from friction so no heat gun needed. what we are talking about is milli-seconds here so i say do whichever you are comfortable with.

BDI:
The only reason you can get away with installing a piston dry is do to the miracle of ceramic coating. I sure hope no one tries this with a cast iron engine. This is kinda like the brake it in like you drive it deal. An engine that is broke in hard will show more ponies on the dyno right off the bat then an engine that is broken in correctly. The engine that is broken in correctly will show the same horse power further down the road and it will sustaine those levels for a longer time. The brake it in like you drive it thing is what you do to motors in race cars that have a very short life expectancy. I'm sure that a motor with a ceramic bore that is put together dry will seat the rings alot faster but their has to be a trade off. I'm sure that a motor put together correctly and busted in correctly will show more peak ponies and sustaine them longer then one done otherwise. So in other words My engine put together wet and broke in correctly will lose to your engine put together dry and broke in how ever you like on the dyno but after a month of running these engines, the dyno will tell a different story. After a year it will be even more apparent. Just my opinion

azdirtrider75:
I'm with you BDI - I'll always do my top ends with plenty of oil. Lubrication is the key to a happy engine (and bike for that matter). To all of you that put pistons in dry - clean and dry your bearings; I bet they spin super fast - until they don't.

slow600:
haha sleeved cylinders get the dry treatment too. like i said earlier, to each his own. voodoo gods say dry engines actually last longer due to less blow-by and oil loss. roller bearings not really a good analogy, kinda like apples and oranges really. i do lube top bearing fyi. im still waiting on proof before i change my mind, i love being proven wrong/learning new things. cheers

BDI:
So then would you put a small block chevy 350 together this way too??...

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