R/C Tech Forums

Go Back   R/C Tech Forums > General Forums > Nitro Off-Road

Reply
 
Thread Tools Search this Thread
Old 08-26-2008, 07:23 PM   #1
Tech Master
 
LosiSuperTruck's Avatar
 
Join Date: Jun 2005
Posts: 1,080
Trader Rating: 18 (100%+)
Default ? about Pinched sleeve and different piston

Well I sent a piston\sleeve in to be pinched. The piston and rod are IMO questionable at best.

I have another piston\sleeve of the same type that needs a pinch. The rod and piston look perfect.

So I put the pinched sleeve and good piston\rod in. They seem to form a good tight fit.

I haven't tried it out yet. Question is will this work? Or am I destined for problems trying this?

Thanks
LosiSuperTruck is offline   Reply With Quote
Old 08-26-2008, 07:33 PM   #2
Tech Elite
 
imaxx21's Avatar
 
Join Date: Nov 2007
Location: FL
Posts: 2,725
Trader Rating: 1 (100%+)
Send a message via AIM to imaxx21
Default

your're asking for a tuning nitemare....IMO
__________________
-Crash
Upgrade RC www.upgrade-rc.com
imaxx21 is offline   Reply With Quote
Old 08-26-2008, 07:38 PM   #3
Tech Elite
 
22Racer's Avatar
 
Join Date: Mar 2002
Location: Wanamingo Mn
Posts: 3,079
Trader Rating: 67 (100%+)
Default

You can use a piston out of a different motor, you have to have the right fit though, too tight and something will give.
I have actually made sleeves bigger to fit a piston and fix a pinch job someone tried with one of those cheap pinchers. If your not sure send me the piston and sleeve and I'll look at it.

Rex
__________________
Rw modding and engine repair http://www.rw-mods.com
Sleeve resizing $15.00/ motor rebuild $30.00
Argus engine distributor/Avid bearings/ Alpha engines/
Fx Royal engines/ Maxy Engines
e-mail rwmods@yahoo.com Rex Welch
22Racer is offline   Reply With Quote
Old 08-27-2008, 06:05 PM   #4
Tech Master
 
LosiSuperTruck's Avatar
 
Join Date: Jun 2005
Posts: 1,080
Trader Rating: 18 (100%+)
Default

Thanks for the replies. I decided to put the piston\rod that I sent in (OS Rocket) before I fired it up. It was a super tight fit.

Another ? for ya.

Can a tight pinch stall the engine? It was really hard to start. It would fire up, then immediately stall. It looked exactly like I had a blown out clutch, so you know what I mean. And yes, my clutch is freshly built and was not hanging.

After messing with it a while I finally got it running. Was temping at 200 just sitting on a brick. Then it magically dropped to 110 toward the end of the tank.

What I don't like is I have to run a high idle to keep it running. And when it stalls it acts like the clutch and the piston is stuck.

This pinch is much tighter than it was when new. So is my only problem I need more break-in time?

Thanks
LosiSuperTruck is offline   Reply With Quote
Old 08-27-2008, 07:52 PM   #5
Tech Elite
 
22Racer's Avatar
 
Join Date: Mar 2002
Location: Wanamingo Mn
Posts: 3,079
Trader Rating: 67 (100%+)
Default

Yes it will stall when the pich is tight. You need to keep the temp over 200 otherwise it's too much stress on the rod.
I've heard Os Rocket pinches them pretty tight, I pinch mine so they are about like after 6 tanks.

Rex
__________________
Rw modding and engine repair http://www.rw-mods.com
Sleeve resizing $15.00/ motor rebuild $30.00
Argus engine distributor/Avid bearings/ Alpha engines/
Fx Royal engines/ Maxy Engines
e-mail rwmods@yahoo.com Rex Welch
22Racer is offline   Reply With Quote
Old 08-27-2008, 11:27 PM   #6
Tech Adept
 
NEMESIS44's Avatar
 
Join Date: Apr 2008
Location: Meridian,Ms.
Posts: 249
Trader Rating: 8 (100%+)
Send a message via AIM to NEMESIS44
Default

+1 for 22racer's pinch. I sent Rex a sleeve a couple of months ago and am nearing the end of the 3rd gallon since I got it back....and still running
__________________
Losi 8ight 2.0,Werks B6, Spektrum, Savox HVs, AKA
Loving me some FRC!
NEMESIS44 is offline   Reply With Quote
Old 08-28-2008, 02:45 PM   #7
Tech Master
 
LosiSuperTruck's Avatar
 
Join Date: Jun 2005
Posts: 1,080
Trader Rating: 18 (100%+)
Default

Might have to give him a try. I hate that super pinch from OS rocket. Makes it a real PITA to start them up again.

I've got a couple for worn out engines laying around. What do you charge?
LosiSuperTruck is offline   Reply With Quote
Old 08-28-2008, 06:20 PM   #8
Tech Regular
 
bjr48's Avatar
 
Join Date: Apr 2008
Posts: 274
Default

Try RayARacing next time for your pinch. He is not as agressive and pinches the sleeve in different steps to keep the tapered shape. I am happy with mine.
bjr48 is offline   Reply With Quote
Old 08-28-2008, 08:33 PM   #9
Tech Elite
 
22Racer's Avatar
 
Join Date: Mar 2002
Location: Wanamingo Mn
Posts: 3,079
Trader Rating: 67 (100%+)
Default

$15.00 includes shipping back!!!

$35.00 to go through the whole motor. Includes cleaning, pinch, bearing replacement if needed, checking crank wear and rod clearance. I also use Tko bearings.

Rex
__________________
Rw modding and engine repair http://www.rw-mods.com
Sleeve resizing $15.00/ motor rebuild $30.00
Argus engine distributor/Avid bearings/ Alpha engines/
Fx Royal engines/ Maxy Engines
e-mail rwmods@yahoo.com Rex Welch
22Racer is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
JP engines jasoncsc Onroad Nitro Engine Zone 1160 05-10-2017 07:19 AM
Mugen JX21 jlinds Offroad Nitro Engine Forum 1448 03-19-2015 07:22 AM
wants a good truggy motor that wont break the bank dgdcustoms Nitro Off-Road 72 02-21-2009 09:34 PM
Anyone heard of pinching cylinders shepherdluva Nitro Off-Road 12 12-13-2008 08:16 AM
Fantom Engine Manual = ABC Engine Bible Horatio Monster Trucks 9 02-05-2007 07:35 AM
engine pinching.... anyone know? downunder23 Electric Off-Road 13 08-15-2006 06:59 AM



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 12:08 AM.


Powered By: vBulletin v3.9.2.1
Privacy Policy | Terms of Use | Advertise Content © 2001-2011 RCTech.net