ringed?

Old 12-24-2008, 04:51 PM
  #1  
Tech Addict
Thread Starter
iTrader: (7)
 
desertbird's Avatar
 
Join Date: Apr 2008
Location: Surprise, AZ
Posts: 551
Trader Rating: 7 (100%+)
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...
desertbird is offline  
Old 12-24-2008, 05:02 PM
  #2  
Tech Regular
iTrader: (7)
 
bigsquidracer's Avatar
 
Join Date: Sep 2008
Location: redding
Posts: 445
Trader Rating: 7 (100%+)
Default

idk. thats a really good question ad rebould would be easier and no more abc engines idk. maybe those are 4 stroke engines??
bigsquidracer is offline  
Old 12-24-2008, 05:11 PM
  #3  
Tech Addict
Thread Starter
iTrader: (7)
 
desertbird's Avatar
 
Join Date: Apr 2008
Location: Surprise, AZ
Posts: 551
Trader Rating: 7 (100%+)
Default

they are 2 stroke.
desertbird is offline  
Old 12-24-2008, 05:12 PM
  #4  
Tech Master
iTrader: (10)
 
rossoh10's Avatar
 
Join Date: Jul 2006
Location: Bakersfield Ca
Posts: 1,097
Trader Rating: 10 (100%+)
Default

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....
rossoh10 is offline  
Old 12-24-2008, 05:13 PM
  #5  
Tech Master
iTrader: (10)
 
rossoh10's Avatar
 
Join Date: Jul 2006
Location: Bakersfield Ca
Posts: 1,097
Trader Rating: 10 (100%+)
Default

....................
rossoh10 is offline  
Old 12-24-2008, 05:16 PM
  #6  
Tech Master
iTrader: (10)
 
rossoh10's Avatar
 
Join Date: Jul 2006
Location: Bakersfield Ca
Posts: 1,097
Trader Rating: 10 (100%+)
Default

Can you post a link to the engine your looking at
rossoh10 is offline  
Old 12-24-2008, 05:16 PM
  #7  
Tech Addict
Thread Starter
iTrader: (7)
 
desertbird's Avatar
 
Join Date: Apr 2008
Location: Surprise, AZ
Posts: 551
Trader Rating: 7 (100%+)
Default

I must of mis-read it. That makes sense. Thanks!
desertbird is offline  
Old 12-24-2008, 05:25 PM
  #8  
Tech Adept
iTrader: (10)
 
Djballen's Avatar
 
Join Date: Mar 2007
Posts: 246
Trader Rating: 10 (100%+)
Default

http://www3.towerhobbies.com/cgi-bin...?&I=LXCNA5&P=7

These are airplane four stoke motors.
Djballen is offline  
Old 12-24-2008, 05:45 PM
  #9  
Tech Master
iTrader: (10)
 
rossoh10's Avatar
 
Join Date: Jul 2006
Location: Bakersfield Ca
Posts: 1,097
Trader Rating: 10 (100%+)
Default

Desertbird said it was a 2 stoke ringed engine........

post a link desertbird to the eninge your talking about
rossoh10 is offline  
Old 12-24-2008, 05:48 PM
  #10  
Tech Fanatic
iTrader: (93)
 
jaylude22's Avatar
 
Join Date: Dec 2007
Location: Redding, Ca.
Posts: 814
Trader Rating: 93 (99%+)
Default

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.
jaylude22 is offline  
Old 12-24-2008, 06:03 PM
  #11  
Tech Master
 
jrwoodchuck's Avatar
 
Join Date: Nov 2007
Location: Northampton, Massachusettes
Posts: 1,336
Default

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.
jrwoodchuck is offline  
Old 12-25-2008, 05:59 AM
  #12  
Tech Addict
Thread Starter
iTrader: (7)
 
desertbird's Avatar
 
Join Date: Apr 2008
Location: Surprise, AZ
Posts: 551
Trader Rating: 7 (100%+)
Default

thanks guys, I knew there had to be reason our engines didn't use em.
desertbird is offline  
Old 12-25-2008, 12:40 PM
  #13  
Tech Fanatic
iTrader: (7)
 
gubbs3's Avatar
 
Join Date: Aug 2006
Location: MN
Posts: 787
Trader Rating: 7 (100%+)
Default

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.
gubbs3 is offline  
Old 12-25-2008, 01:33 PM
  #14  
Tech Lord
iTrader: (24)
 
wingracer's Avatar
 
Join Date: Nov 2007
Posts: 13,733
Trader Rating: 24 (100%+)
Default

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.
wingracer is offline  
Old 12-25-2008, 05:36 PM
  #15  
Tech Lord
iTrader: (21)
 
Join Date: Jul 2008
Location: Houston, TX
Posts: 11,530
Trader Rating: 21 (100%+)
Default

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.
Duster_360 is offline  

Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service -

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.