RB WS7 piston

Reply

Old 09-25-2005, 01:15 AM
  #1  
Tech Apprentice
Thread Starter
 
Join Date: Sep 2005
Posts: 80
Default RB WS7 piston

Hello,
What kind of a different piston would fit a RB WS7 engine ?
I have an overheated ws7 engine, the sleeve is in top shape, what i can't say about the piston. So i need only the piston. Maybe i could fit in a piston from other engines ? Don't want to spend 105 on a new pair for the rb.
Thank you
Taurius is offline  
Reply With Quote
Old 09-25-2005, 06:33 AM
  #2  
Tech Lord
iTrader: (81)
 
Davidka's Avatar
 
Join Date: Oct 2004
Posts: 10,426
Trader Rating: 81 (100%+)
Default

Unfortunately they are sold in matched sets. I have never heard of pistons sold separately.
Davidka is offline  
Reply With Quote
Old 09-25-2005, 06:41 AM
  #3  
Tech Master
 
Join Date: Jan 2002
Location: Margaritaville
Posts: 1,957
Default

Originally Posted by Davidka
Unfortunately they are sold in matched sets. I have never heard of pistons sold separately.
And also the are machined to work together. Even another piston out of a RB motor probably will either be too big for the sleeve or too small. More than likely the sleeve is stressed if you damaged the piston.
NismoSkyline17 is offline  
Reply With Quote
Old 09-27-2005, 01:04 PM
  #4  
Tech Apprentice
Thread Starter
 
Join Date: Sep 2005
Posts: 80
Default

Is it possible to put a c5 piston in a ws7 ? The bore is the same
Taurius is offline  
Reply With Quote
Old 09-27-2005, 02:16 PM
  #5  
Tech Lord
iTrader: (81)
 
Davidka's Avatar
 
Join Date: Oct 2004
Posts: 10,426
Trader Rating: 81 (100%+)
Default

You could try it but the stroke of those two engines might not be the same. If the wrist pin is in a different position on the piston it will mess up the port timing or worse of the piston crown travels farther up the sleeve. Assemble it and put the piston @ bottom dead center. The top of the piston should be exactly even with the bottom of the exhaust port. If it is, it should work providing the piston/sleeve fit is not too tight.
Davidka is offline  
Reply With Quote
Old 09-27-2005, 04:04 PM
  #6  
Tech Elite
iTrader: (28)
 
Join Date: Oct 2004
Location: Michigan
Posts: 3,331
Trader Rating: 28 (100%+)
Default

I've had good luck having Rayaracing squeezing my piston/sleeve back to a good pinch. Under 20 bux shipped. Shoot him an email. Here's his website: Rayaracing Resizing
jbrow1 is offline  
Reply With Quote
Old 09-27-2005, 06:25 PM
  #7  
Tech Adept
iTrader: (5)
 
Join Date: Sep 2005
Posts: 122
Trader Rating: 5 (100%+)
Default

OS Rocket on Ebay also does a pinching service. I am maybe going to be sending a Collari to them this winter...heard great things.
ZachKipp is offline  
Reply With Quote
Old 09-27-2005, 06:31 PM
  #8  
Tech Elite
iTrader: (28)
 
Join Date: Oct 2004
Location: Michigan
Posts: 3,331
Trader Rating: 28 (100%+)
Default

If you go with osrocket make sure and tell him a "light" pinch. Only reason I recommend Ray over os is I got one done by each at the same time. The one osrocket did I can't roll the sucker over. Going to have to mount it on a board and start with a drill. The one from Ray was tight, but I could start it. Saved me alot of frustration. Just raced that engine in my 1/8 on sunday and it ran great and idled like a kitten.
jbrow1 is offline  
Reply With Quote
Old 09-28-2005, 07:34 AM
  #9  
Tech Apprentice
Thread Starter
 
Join Date: Sep 2005
Posts: 80
Default

What do they do when they give the engine a squeeze ? The bad thing about the piston is that it has big deep scratches only at the exhaust port :/ Ant the sleeve has seen only a gallon.
Taurius is offline  
Reply With Quote
Old 09-28-2005, 01:43 PM
  #10  
Tech Elite
iTrader: (28)
 
Join Date: Oct 2004
Location: Michigan
Posts: 3,331
Trader Rating: 28 (100%+)
Default

It crimps the sleeve so that the piston is tighter in the bore like when new. My sleeve got ovaled out of round, and Ray got it round again and gave it a pinch as well. I'd email him and ask what he thinks about your piston. Maybe send a pic of it with the email. Maybe it can be sanded or buffed out then the sleeve pinched back to size.
jbrow1 is offline  
Reply With Quote
Old 10-11-2005, 11:54 AM
  #11  
Tech Addict
iTrader: (15)
 
layedbackguy's Avatar
 
Join Date: Mar 2005
Location: dc,md,va,nc,oh
Posts: 514
Trader Rating: 15 (100%+)
Default

I dont think other piston sleeves will work in that set up. But i have put a Ws7II piston sleeve in my S7 and that thing rocks!!!!!!!!!!!! it's cheaper to get it pinched than buy a new motor. I have went tru more than 5 motors in 2 seaons of racing, and had them all pinched and they are as like new now. I bought the tool from ebay, instead of used rayracing, and after a few tries i got them right perfect..
layedbackguy is offline  
Reply With Quote
Old 10-11-2005, 12:34 PM
  #12  
Tech Regular
iTrader: (46)
 
MonkeyButt's Avatar
 
Join Date: Mar 2005
Location: MA
Posts: 419
Trader Rating: 46 (100%+)
Default pistons and sleeves

RB ws7,ws7 II,s7, s7 II and s5 piston and sleeves will all fit that motor
MonkeyButt is offline  
Reply With Quote
Old 10-11-2005, 05:05 PM
  #13  
Tech Regular
 
Join Date: Sep 2005
Location: Au
Posts: 329
Default

also the eco 3 fits... about $70bux
qwerty is offline  
Reply With Quote

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off


Thread Tools
Search this Thread

Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service