RC Giant Scale Cars For all those who love driving large scale rc cars share your projects or ask questions here.

help with big bore kit

Reply

Old 12-31-2008, 07:45 AM
  #1  
selena1718
Senior Member
Thread Starter
 
Join Date: Feb 2006
Location: pittsfield, MA
Posts: 210
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default help with big bore kit

hi,just got a big bore kit from ddm,when i installed the piston,i read that the arrow on top of piston should be facing exhaust port, but there was no arrow on top of piston,the other side of piston was the little notch that the space in the ring goes ,my question is i have the notch facing the exhaust port,instead of intake port,will it be ok if i left it this way,i read that the notch is suppose to be on the intake side,thanks for any input
selena1718 is offline  
Reply With Quote
Old 12-31-2008, 07:55 AM
  #2  
tom111
Senior Member
 
tom111's Avatar
 
Join Date: Jan 2007
Location: Jerusalem, ISRAEL
Posts: 407
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: help with big bore kit

you must have some kind of mark on the top of the piston, I know that CY’s big bore kits have “dot” on the piston rather than the arrow, this dot \ arrow or any other mark that you have must face the exhaust port, otherwise you might ruin the kit, also make sure that the ring is closed well around the small pin if it won’t be like that so you might ruin the head & piston.

With a basic search on that topic in the forum you will find a lot of threads, many guys had the same issue…

Good luck!
tom111 is offline  
Reply With Quote
Old 12-31-2008, 10:52 AM
  #3  
pilotjohn
Senior Member
 
Join Date: Apr 2005
Location: NW, IN
Posts: 158
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: help with big bore kit

Just make sure the ring gap is on the intake side and you will be fine.
pilotjohn is offline  
Reply With Quote
Old 01-02-2009, 11:50 AM
  #4  
kryptonite5b
Senior Member
My Feedback: (-2)
 
Join Date: May 2008
Location: philipsburg, PA
Posts: 351
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: help with big bore kit

the reason it needs to be facing the intake is couse the ring gap can an will get cought on the ehaust port. it will start and run fine, but there is a HIGH chance that you will ruin your ring, piston, head, and could also do more damage to the crank shaft.
kryptonite5b is offline  
Reply With Quote
Old 01-02-2009, 06:53 PM
  #5  
speedy.d
Senior Member
 
Join Date: Dec 2008
Location: , IN
Posts: 487
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: help with big bore kit

you also want to make sure that the gap on your wrist pin clips is facing down, so you dont lose one while your engine is running. not a pretty site!
speedy.d is offline  
Reply With Quote

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


Thread Tools
Search this Thread

Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service