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 12-09-2010, 10:56 PM   #1
Tech Apprentice
 
Join Date: Nov 2010
Posts: 54
Thumbs up Can New OS XZ-R .21 BE TURNED OVER BY BARE HAND???

Hey guys just got a new OS XZ-R .21 RACE ON-ROAD ENGINE. I was wondering if I should be able to turn the engine over with my bare hand/fingers? It's suppose to be a "high-compression" engine and I didn't think I could turn it over with just hand pressure. I had a JP modified Kangaroo engine which was nearly impossible to turn over by hand. Thank you for any input you might have on this matter!
emin007 is offline   Reply With Quote
Old 12-09-2010, 11:08 PM   #2
Tech Initiate
 
Join Date: Apr 2008
Posts: 37
Default

Hi, had the same problem with the first engine I had, ran it for half a day and gave up with it, couldn't tune it, wouldn't run right, returned to importer who rebuilt it, new piston and liner despite a lot of arguments, have run it since and can't fault it at all.

Andy
Shepherd is offline   Reply With Quote
Old 12-10-2010, 01:47 AM   #3
Tech Addict
 
Join Date: Dec 2008
Posts: 729
Default

If the engine is BRAND-SPANKIN-NEW then it will be damn near impossible to turn it over without some sort of damage done internally.
If it's pretty much fully broken in, then it should be tricky if the engine is completely out of the car, and very hard if it is installed!
__________________
Car-less (Velox V10 or 733) // RB T10.5"+" (JB Modified) // Bluebird BMS-990DMG (St) & BMS-631 (T/B) // ATS 16% // Capricorn Wheels // Protoform
"70% of the time, it works ALL the time"
DJ_Shakespear is offline   Reply With Quote
Old 12-10-2010, 08:44 AM   #4
Tech Master
 
GREGORY!'s Avatar
 
Join Date: Jun 2006
Location: Greece
Posts: 1,075
Trader Rating: 1 (100%+)
Default

you had to preheat at about 90C any brand new engine before you start to break in it.i keep doing this for 1 gallon.
__________________
" kyosho rrr wc-team orion crf "
" serpent 966-mega zx21 EM "
" mugen mbx6-picco p7r evo 2 "
GREGORY! is online now   Reply With Quote
Old 12-10-2010, 06:29 PM   #5
Tech Lord
 
wingracer's Avatar
 
Join Date: Nov 2007
Posts: 12,861
Trader Rating: 24 (100%+)
Default

You say it's brand new, NEVER seen fuel? If so, that sounds wrong.
__________________
Sean. Certified speed crazed mowron.
Team Shepherd USA
www.ashfordhobby.com
wingracer is offline   Reply With Quote
Old 12-21-2010, 04:19 AM   #6
M7H
Tech Elite
 
M7H's Avatar
 
Join Date: Dec 2004
Location: The Netherlands
Posts: 2,196
Default

Quote:
Originally Posted by wingracer View Post
You say it's brand new, NEVER seen fuel? If so, that sounds wrong.
A brand new Picco, you can turn over, with a flywheel mounted.
After it has run 2 tanks, then it is more difficult...

Picco (based) engines, don't have this very tight fit, when brand new, maybe they have smaller tolerances, so they don't need a tight fit.

So if Picco hasn't, why can't OS?
__________________
Serpent
M7H is offline   Reply With Quote
Old 12-22-2010, 01:07 AM   #7
Tech Addict
 
Join Date: Dec 2008
Posts: 729
Default

Every single brand-new engine should have a pinch so great in the beginning to ensure that it makes pretty much a perfect contact with each other so that they can form a near-perfect seal once fully broken in. That level of pinch varies from manufacturer to manufacturer, some being incredibly tight (RB for example) to being fairly tight (Picco for example) It varies, but all are hard to turn over by hand, at least when mounted on the car. If it's out and in your hand where you can use more than your fingers, it will obviously be easier, but it SHOULD still be very difficult to get it past, if not INTO TDC.
__________________
Car-less (Velox V10 or 733) // RB T10.5"+" (JB Modified) // Bluebird BMS-990DMG (St) & BMS-631 (T/B) // ATS 16% // Capricorn Wheels // Protoform
"70% of the time, it works ALL the time"
DJ_Shakespear is offline   Reply With Quote
Reply



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 01:33 PM.


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