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Old 12-24-2008, 04:51 PM   #1
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Default ringed?

So I was looking at the flyer Tower sent me and noticed airplane engines that say ringed.

Is this piston rings? If it is why don't car engines have em? I'd imagine they'd last longer with rings...
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Old 12-24-2008, 05:02 PM   #2
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idk. thats a really good question ad rebould would be easier and no more abc engines idk. maybe those are 4 stroke engines??
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Old 12-24-2008, 05:11 PM   #3
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they are 2 stroke.
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Old 12-24-2008, 05:12 PM   #4
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the nitro engines we run,run off the compression the sleeve and piston make..........I believe the rings in a 4 stroke make the compression,and there is no piston to sleeve pinch........Even if we did use rings in these engines they probably wouldn`t stay where they were suppost to when the engine is turning at 35,000 rpms......4 stroke engines don`t turn half that number in rpm....
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Old 12-24-2008, 05:13 PM   #5
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....................
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Old 12-24-2008, 05:16 PM   #6
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Can you post a link to the engine your looking at
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Old 12-24-2008, 05:16 PM   #7
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I must of mis-read it. That makes sense. Thanks!
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Old 12-24-2008, 05:25 PM   #8
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http://www3.towerhobbies.com/cgi-bin...?&I=LXCNA5&P=7

These are airplane four stoke motors.
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Old 12-24-2008, 05:45 PM   #9
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Desertbird said it was a 2 stoke ringed engine........

post a link desertbird to the eninge your talking about
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Old 12-24-2008, 05:48 PM   #10
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The nitro engines in helicopters use a ring, they are not 4 stroke. Here's an example: http://www.amainhobbies.com/product_...oducts_id/9471

I agree with rossoh, the ring would not stand up to the rpm that our car engines are operating at. The specs for the engine in the link I attached state it's practical rpm range between 2,000-20,000. We all know that the car engines are operating at considerably higher rpm.
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Old 12-24-2008, 06:03 PM   #11
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I've been flying heli's for 15 years and yes, ringed engines can't hold up to the rpm. We stay around 15,000 rpm the entire flight (loaded and unloaded) and when the ring is warn out, it's $20.00, and you got a new engine. But I will admit, I love hearing 33,000 rpm in my buggys.
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Old 12-25-2008, 05:59 AM   #12
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thanks guys, I knew there had to be reason our engines didn't use em.
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Old 12-25-2008, 12:40 PM   #13
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Yes, the rings won't hold up to the high rpm that our engines turn. This is compounded by the problem of size as well. You will notice if you look around that the smallest ringed engines you'll find are usually .90 and larger. There are a few in the .60 range that are ringed but are usually not the most potent performers. As the piston gets smaller the ring must also be made smaller, and this further reduces its durability.
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Old 12-25-2008, 01:33 PM   #14
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Many airplane motors use rings. Most are four stroke but some two strokes are ringed too.

One of the many problems with rings in car motors are the enormous intake and exhaust ports. Designing ports that big that wouldn't snag the rings (and destroy the motor) would be almost impossible. Ringless is a much better option for our application.
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Old 12-25-2008, 05:36 PM   #15
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Look at the diff in RPM - plane 15-16,000, car 35,000+ RPM. Piston rings can't handle the rpm - actually its the g loading when the piston direction changes that they can't handle.
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