R/C Tech Forums

Go Back   R/C Tech Forums > General Forums > Nitro On-Road > Onroad Nitro Engine Zone

Reply
 
Thread Tools Search this Thread
Old 04-23-2012, 05:22 PM   #1
Tech Apprentice
 
Join Date: Mar 2012
Posts: 95
Default Sleeve Pinching

I have read a few threads where sleeve pinching is mentioned but no true meat and potatoes regarding the subject. How effective is "pinching" and does the engine respond like a new engine? Will I have to go through the break-in process again and where is the best place to send the piston and sleeve for pinching?

Thanks,
Z'Stein is offline   Reply With Quote
Old 04-23-2012, 05:31 PM   #2
Tech Apprentice
 
LSVTIEG's Avatar
 
Join Date: Jan 2012
Location: Oklahoma City, Ok
Posts: 97
Default

why not just buy a new piston & sleeve?
LSVTIEG is offline   Reply With Quote
Old 04-23-2012, 09:30 PM   #3
Tech Apprentice
 
Join Date: Mar 2012
Posts: 95
Default

Quote:
Originally Posted by LSVTIEG View Post
why not just buy a new piston & sleeve?
I can do that. However, I am more interested in knowing more about sleeve pinching and its effectiveness. Any responses to that end is appreciated.
Z'Stein is offline   Reply With Quote
Old 04-23-2012, 09:38 PM   #4
Tech Master
 
Join Date: May 2006
Posts: 1,805
Trader Rating: 118 (98%+)
Default

ive had many of them done and only had one that was to tight yes a u will need to break in as needed. and it saves money untill its really needed i used os rocket out of ohio.
ashxxx is offline   Reply With Quote
Old 04-23-2012, 09:49 PM   #5
Tech Apprentice
 
Join Date: Mar 2012
Posts: 95
Default

Quote:
Originally Posted by ashxxx View Post
ive had many of them done and only had one that was to tight yes a u will need to break in as needed. and it saves money untill its really needed i used os rocket out of ohio.
That's what I'm talking about!! Thanks. What's the turn around time like?
Z'Stein is offline   Reply With Quote
Old 04-24-2012, 12:33 AM   #6
Tech Initiate
 
QuiXoTic_NL's Avatar
 
Join Date: Mar 2009
Location: The Netherlands
Posts: 42
Default

I have used rayaracing before. After the pinch and break-in, a completely worn-out piston/sleeve got me through an entire season. Performance was good. So yes, it's a good way to extend the life of your engine and save some money.
__________________
Shepherd V10 Pro 2015 - Matrix tires - Novarossi Engines - Runnertime
QuiXoTic_NL is offline   Reply With Quote
Old 04-24-2012, 07:48 AM   #7
Tech Apprentice
 
Join Date: Mar 2012
Posts: 95
Default

Quote:
Originally Posted by QuiXoTic_NL View Post
I have used rayaracing before. After the pinch and break-in, a completely worn-out piston/sleeve got me through an entire season. Performance was good. So yes, it's a good way to extend the life of your engine and save some money.
Yeah, I will be sending mine out tomorrow. I checked out OS Rocket's site, and that seem like a good place. I will look into Rayaracing and decide between the two. Thanks for the feed-back.
Z'Stein is offline   Reply With Quote
Old 04-24-2012, 12:00 PM   #8
Tech Champion
 
Roelof's Avatar
 
Join Date: Aug 2007
Location: Holland
Posts: 6,282
Send a message via ICQ to Roelof
Default

I have done a lot .21 engines and was payed with just a hamburger on the track and all were very satisfied
__________________
The quality of an answer comes with the quality of the question.
Roelof is online now   Reply With Quote
Old 04-24-2012, 03:49 PM   #9
Tech Apprentice
 
Join Date: Mar 2012
Posts: 95
Default

Quote:
Originally Posted by Roelof View Post
I have done a lot .21 engines and was payed with just a hamburger on the track and all were very satisfied
Roelof:

How are you my man? I was hoping you would comment on this issue. I think I will send the piston and sleeve out tomorrow. However, I would like to be able to do my own sleeves. Any idea where I can buy the equipment to start doing my own? Thanks for the reply.
Z'Stein is offline   Reply With Quote
Old 04-24-2012, 05:48 PM   #10
Tech Elite
 
blis's Avatar
R/C Tech Elite Subscriber
 
Join Date: May 2008
Location: Brisbane
Posts: 3,434
Default

Quote:
Originally Posted by Z'Stein View Post
I can do that. However, I am more interested in knowing more about sleeve pinching and its effectiveness. Any responses to that end is appreciated.
You have to replace the matter than has worn away if you dont, once the pinch warms up and expands against the block, I'd expect you to be low on compression and expect it may be hard to tune .

PS: I could be wrong.
__________________
RC Cars: E4/G4/TCX/LAB-C02/T4'15/MM Engines
WEB: Beachmums Racing - MYRCM Race Registration
Media: Amain - RCRacingTV - RedRC - LiveRC - blisx264
blis is offline   Reply With Quote
Old 04-24-2012, 09:02 PM   #11
Tech Apprentice
 
Join Date: Mar 2012
Posts: 95
Default

Quote:
Originally Posted by blis View Post
You have to replace the matter than has worn away if you dont, once the pinch warms up and expands against the block, I'd expect you to be low on compression and expect it may be hard to tune .

PS: I could be wrong.
I don't quite understand what you are saying. Can you explain it as if you are talking to a 5 year old. I think I will get it then.
Z'Stein is offline   Reply With Quote
Old 04-24-2012, 09:17 PM   #12
Tech Elite
 
blis's Avatar
R/C Tech Elite Subscriber
 
Join Date: May 2008
Location: Brisbane
Posts: 3,434
Default

Quote:
Originally Posted by Z'Stein View Post
I don't quite understand what you are saying. Can you explain it as if you are talking to a 5 year old. I think I will get it then.
As I said I could be wrong and many prove that it works. To answer you, what I mean is an engine loses compression because the piston and liner wear away. Once that material is gone, it's gone!
__________________
RC Cars: E4/G4/TCX/LAB-C02/T4'15/MM Engines
WEB: Beachmums Racing - MYRCM Race Registration
Media: Amain - RCRacingTV - RedRC - LiveRC - blisx264
blis is offline   Reply With Quote
Old 04-25-2012, 08:46 PM   #13
Tech Apprentice
 
Join Date: Mar 2012
Posts: 95
Default

Quote:
Originally Posted by blis View Post
As I said I could be wrong and many prove that it works. To answer you, what I mean is an engine loses compression because the piston and liner wear away. Once that material is gone, it's gone!
Actually, I think you "are" wrong. The purpose of pinching the sleeve is to re-gain compression/tighten the sleeve as if is new, or better, to start the process of "fresh motor" over. Thanks for your comment though.
Z'Stein is offline   Reply With Quote
Old 04-25-2012, 11:19 PM   #14
Tech Master
 
Pablo Diablo's Avatar
 
Join Date: Dec 2008
Location: Sydney Australia
Posts: 1,005
Trader Rating: 2 (100%+)
Send a message via Skype™ to Pablo Diablo
Default

Surely the hard chromed liner wears much slower than the comparitively soft aluminium piston. Does just replacing the piston after a while help?
__________________
Paul H

Losi Type R | Xray T3 | CRC Gen XL | CRC Gen X 10 ME(Messiah Edition) | Black Diamond

www.FlyingFoxRC.com | Advanced Electronics | Team CRC | Factory Messiah
Pablo Diablo is offline   Reply With Quote
Old 04-26-2012, 12:27 AM   #15
Tech Champion
 
Roelof's Avatar
 
Join Date: Aug 2007
Location: Holland
Posts: 6,282
Send a message via ICQ to Roelof
Default

Quote:
Originally Posted by Pablo Diablo View Post
Surely the hard chromed liner wears much slower than the comparitively soft aluminium piston. Does just replacing the piston after a while help?
They must be available.....

Problem with our kind of engines is that the piston and sleeve have matching materials regarding the expansion. Materials can change due different suppliers so there is a chance that the piston of one production serie does not match the sleeve of other. Beside that due tolerances the dimensions aren't equal, they can differ up to some microns so you must have several pistons try to match your sleeve in size. To prevent that they just deliver a compleete matching P/S set.
__________________
The quality of an answer comes with the quality of the question.
Roelof is online now   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
sleeve pinching question? NoMercyRC Offroad Nitro Engine Forum 11 02-25-2011 04:23 AM
sleeve pinching? scurran Onroad Nitro Engine Zone 43 08-30-2010 06:00 AM
Free sleeve pinching mud99 R/C Items: For Sale/Trade 14 11-27-2008 09:10 PM
Sleeve pinching tool? berwicknitro Onroad Nitro Engine Zone 22 04-21-2005 12:47 PM



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search

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



All times are GMT -7. It is currently 04:39 AM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
Powered By: vBulletin v3.9.2.1
Privacy Policy | Terms of Use | Advertise Content © 2001-2011 RCTech.net