R/C Tech Forums

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

Reply
 
Thread Tools Search this Thread
Old 05-21-2004, 10:04 PM   #1
Tech Addict
 
j240z's Avatar
 
Join Date: Apr 2004
Location: Everybody to the limit!
Posts: 651
Default Break in tips for OS TR engine

I'm in the process of breaking in a new OS TR turbo .12 engine in my ntc3. It seems to lock up quite a bit. I've tried heating it up with a hair dryer but it really gets stuck with the piston at the top of the stroke. Even with the glow plug out the piston still gets stuck at the top. I was able to get 2.5 tanks through it when it seemed to finally loosen up a bit when it flooded and died. I then tried to restart it while it was warm, and once again the piston was stuck up top. I've let the engine cool down and it's still doing the same thing. Is this normal? I've never broken in such a stubbornly tight engine. Any tips?
j240z is offline   Reply With Quote
Old 05-21-2004, 10:28 PM   #2
B
Tech Master
 
Join Date: May 2003
Location: NorCal
Posts: 1,159
Trader Rating: 7 (100%+)
Default

Yea that is very normal. An european (novarossi, etc) is even tighter IMO. You are going to encounter that with every high performance engine you get in the future.

Just make sure you are using a strong starter box
B is offline   Reply With Quote
Old 05-21-2004, 11:41 PM   #3
Tech Addict
 
j240z's Avatar
 
Join Date: Apr 2004
Location: Everybody to the limit!
Posts: 651
Default

Thanks. Dual 550's in the box. Getting my money's worth out of them right now. It seems to be getting a little easier now after the 5th tank. Thanks!
j240z is offline   Reply With Quote
Old 05-22-2004, 12:10 AM   #4
B
Tech Master
 
Join Date: May 2003
Location: NorCal
Posts: 1,159
Trader Rating: 7 (100%+)
Default

Quote:
Originally posted by j240z
Thanks. Dual 550's in the box. Getting my money's worth out of them right now. It seems to be getting a little easier now after the 5th tank. Thanks!
no problemo

Yah, as you go through more tanks it will get better. Have fun with that engine, it is a good one.
B is offline   Reply With Quote
Old 06-07-2004, 04:56 PM   #5
wtp
Tech Regular
 
Join Date: Jan 2004
Posts: 321
Trader Rating: 2 (100%+)
Default shimmings?

hi all,currently i using 25% fuel to break in the os-tr turbo ver.is there any need to add in extra shims between head clearance,or is there any tips to proper break in this gem.
wtp is offline   Reply With Quote
Old 06-07-2004, 06:00 PM   #6
Tech Addict
 
j240z's Avatar
 
Join Date: Apr 2004
Location: Everybody to the limit!
Posts: 651
Default Re: shimmings?

Quote:
Originally posted by wtp
hi all,currently i using 25% fuel to break in the os-tr turbo ver.is there any need to add in extra shims between head clearance,or is there any tips to proper break in this gem.
I didn't add or remove anything from my tr-T before or during break-in. I ran just like it came out of the box. Mind you the pinch was super tight and starting it wasn't always easy, especially when cold. Do yourself a favor and get a heat gun or hairdryer and warm up the block if it's hard to turn. It took me 2 days before then engine was easy to start, and that's with a hairdryer. I'm not sure about head shims but I wouldn't mess with them until you're done breaking it in.
j240z is offline   Reply With Quote
Old 06-07-2004, 07:06 PM   #7
Super Moderator
 
Marcos.J's Avatar
R/C Tech Elite Subscriber
 
Join Date: Sep 2003
Location: Semper Fi
Posts: 27,183
Trader Rating: 182 (100%+)
Default Re: shimmings?

Quote:
Originally posted by wtp
hi all,currently i using 25% fuel to break in the os-tr turbo ver.is there any need to add in extra shims between head clearance,or is there any tips to proper break in this gem.
the TR comes already shim for 30% it has a .2 and a .1 shim .
Marcos.J is offline   Reply With Quote
Old 06-07-2004, 07:28 PM   #8
Regional Moderator
 
Darkseid's Avatar
 
Join Date: Aug 2001
Location: At my computer, duh...
Posts: 9,033
Trader Rating: 8 (100%+)
Default

I would just say follow OS's instructions and stick with them and eventually everything will loosen up to the proper tolerances. I had a OS TR and it was easy to start from the very get go and never died on my once all through the break in process...which is very unusual for any engine.
__________________
TLR 22...Tamiya F104...
Darkseid is offline   Reply With Quote
Old 06-08-2004, 06:23 AM   #9
Tech Master
 
ziggy12345's Avatar
 
Join Date: Jun 2003
Location: West Midlands, UK
Posts: 1,596
Default Re: shimmings?

Quote:
Originally posted by wtp
hi all,currently i using 25% fuel to break in the os-tr turbo ver.is there any need to add in extra shims between head clearance,or is there any tips to proper break in this gem.
Hi

There was a great post on the Nitro Engine Thread but it looks like its gone now.

The only way to see what your head clearance is is to take out the plug and insert a piece of solder in the head. It should be bent to poke under the head between the piston and head. Rotate the flywheel until it goes over TDC. Remove the solder and measure with a vernier.

For 20% Nitro 0.018" is good. Go to 0.022" for 30%

As the piston aproaches TDC the mixture is compressed and increases in temp. At some point the mixture will react with the glow plug and ignite.

For a colder plug this will be sooner rather than later. and later rather than sooner for a hot plug!!

So you need to balance the compression with the type of plug to achieve a the correct mixture burn.

A colder plug will give you better bottom end where a hot plug will be for high end power

Hope this helps
__________________
Dedicated RC Car Speed Site

http://www.fast-rc.co.uk/forum/index.php

Sponsored by:
Norfolk and Chance
ziggy12345 is offline   Reply With Quote
Old 06-08-2004, 06:56 AM   #10
Tech Elite
 
fastharry™'s Avatar
 
Join Date: Sep 2001
Location: Mahwah, NJ.. USA!! ..... Home of http://www.fastharry.com
Posts: 2,846
Trader Rating: 4 (100%+)
Send a message via Skype™ to fastharry™
Default

heres the link...

http://www.rctech.net/forum/showthre...m&pagenumber=1
__________________
www.fastharry.com---search "fastharry" on facebook
See Fastharry in Super Nitro racing at the HPI CHALLENGE...
http://www.youtube.com/watch?v=jzo-cBEnE0c
fastharry™ is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
first run engine tips?? Mugen MBX-5 Nitro Off-Road 29 11-09-2007 03:38 PM
NEW Stock Motor break-in tips... gcooper Electric On-Road 1 07-22-2004 03:59 AM
Engine too tight to break in? Tips? chachi Nitro On-Road 6 03-29-2004 09:00 AM
I am planning to Break in my MT12, Give me some tips Team_Akina_1 Nitro On-Road 24 03-06-2003 08:44 PM
Engine Temperatures for Break-In and Normal Use for XTM 24.7 Engine. Head Shims? racer rich Nitro On-Road 0 12-13-2002 11:49 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 08:30 AM.


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