View Full Version : Dust and dirt causing engine's cylinder walls to wear easier
11-23-2007, 02:07 PM
I believe dust and dirt contributes to the wearing of cylinder walls, studies that i have done shows that motorcycles without an air cleaner thier cylinder walls wears faster than motorcycles with an air cleaner on, why? here is why first let me say this, the common grinding compond that is used to grind valves is made from different grade sand (depending on its purpose) along with grease, most places dust and dirt has sand like properties for example the hardness. Imagine a trail bike riding on a dusty road plowing all that dust and dirt allowing its carbs without an air cleaner to suck it all up into its compression chamber sticking on the walls and as the piston returns to the top of the chamber dust is caught between the top ring and the cylinder walls this will automatically grind away the chamber.
for some reason could i be right?
let me know
11-23-2007, 03:15 PM
Kingkanic, Glad to see you back mun, hope all is okay.
You are exactly right. Some engines seem more forgiving than others and will eat a lot of dirt with little evidence of adverse effect. Others not so - If a diesel engine working hard in dusty conditions develops even a small hole in the air intake plumbing, allowing dirt to be pulled in; It only takes a couple of days running like this to ruin the cylinder liners, with noticeable effects of power loss and hard starting.
How's the air compressor project coming along mun? Don't tell me you're thinking about pouring sand down the carburetor and blasting with the exhaust! :laugh:
I know it may seem incredible to you, but here in the land of plenty, many good running engines are simply thrown away. I myself, have tried the sand experiment, and other torture, to good running but valueless engines, just to see what they would take! Red dust was flying out of the exhaust pipe! :laugh:
I remember one old Ford V8 we were putting through the "hot run test", it ate the sand, and was screaming wide open with no oil or water for so long that us boys became bored waiting for it to blow up! Someone finally threw a big rock and knocked the carburetor off of it; that shut it up! :laugh:
11-23-2007, 10:01 PM
Yeah! the air compressor project is on pause for a while bcos i rebuild old dirtbikes to new again and right now i have two unfinished ones. ill send pics soon
11-23-2007, 10:03 PM
Denrep, you're killing me!! When I was riding the Honda's, I was told not to rev this RS250 I was racing to more than 11,000 rpm. I would regularly run it to 12,500 and beyond, with no issues. One race, I was crying for a bit more power... they leaned it out to about 90:1 oil ratio, and I spun it up to over 12,700 several times. It eventually lost a bit of steam, and so after the race, we tried to kill it. That little 2 stroke ate sand, metal shavings, pure gas/ no oil, wide open on the dyno for about 20 minutes!! I believe it was a set of valve springs that finally did it in. Probably the first time a 2 stroke ever failed due to a broken valve spring... And yes, a motor with no air filter will wear the cylinder walls exactly as you stated Kingkanic.
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