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 08-15-2012, 05:27 PM   #1
Tech Adept
 
Join Date: Aug 2012
Posts: 145
Trader Rating: 3 (100%+)
Default OS 21XZ-R SPEED NITRO %

Hi guys, i am concerned about the best percentage of nitro i can run in this engine? 25% 30%? mainly used for high speed runs and general onroad bashing, no racing. thanks!
howard85may is offline   Reply With Quote
Old 08-15-2012, 05:28 PM   #2
Tech Adept
 
Join Date: Aug 2012
Posts: 145
Trader Rating: 3 (100%+)
Default

also, what's the best setting for lsn tune? i cant seem to get it just right. either its too rich or too lean and wont idle? idle speed screw is open about 1mm
howard85may is offline   Reply With Quote
Old 08-15-2012, 06:31 PM   #3
Tech Regular
 
Join Date: Jun 2010
Posts: 391
Trader Rating: 3 (100%+)
Default

25% nitro with at least 10% oil (castor and synthetic mix). With a 0.5mm head clearance (1 piece of 0.2mm silver shim), RP7 plug. Set the mixture correctly and this engine is an absolute beast, be it the standard V2 or Speed version.

HSN and LSN settings I set them on the track according to how the engine perform. But my current setting of the LSN is about 0.5mm out from flush. The mid range adjustment on the other side of the carb I don't touch.
peppernick is offline   Reply With Quote
Old 08-15-2012, 07:02 PM   #4
Tech Adept
 
Join Date: Aug 2012
Posts: 145
Trader Rating: 3 (100%+)
Default

ok mine has two head shims? one .1mm copper and 1 .2mm aluminum. is this correct or should i remove the copper one? and also, on the low speed, if i turn it out to .5mm from flush it bogs or do you mean in .5mm from flush? i got the best result from screwing it in until it cuts off then back it out 1/4 of a turn and it idles fine? i just dont want to damage it thats why i was worried about that. so i need to screw it out more and adjust the idle speed to compensate and remove one shim? im using odonnell 25% with rp7 plug. top end pulls strong it revs up smooth with a light smoke trail. its just the low speed that stumps me. thanks for all your help in advance.
howard85may is offline   Reply With Quote
Old 08-16-2012, 12:25 AM   #5
Tech Adept
 
Join Date: Aug 2012
Posts: 145
Trader Rating: 3 (100%+)
Default

Help please
howard85may is offline   Reply With Quote
Old 08-16-2012, 08:28 AM   #6
Tech Master
 
Grinder's Avatar
R/C Tech Elite Subscriber
 
Join Date: Feb 2003
Posts: 1,857
Trader Rating: 2 (100%+)
Default

Quote:
Originally Posted by howard85may View Post
Help please
Your shimming is ok for 25, or 30% nitro. The low speed needle should be around flush. Everything seems ok.

You may want to check your clutch. That can kill any engines low end.
__________________
www.murnanmodified.com
Grinder is offline   Reply With Quote
Old 08-16-2012, 10:16 AM   #7
Tech Adept
 
Join Date: Aug 2012
Posts: 145
Trader Rating: 3 (100%+)
Default

ok i think the low speed is fine, it is right around flush with the slide body and i just switched my clutch out for 1.1 mm springs and lightweight aluminum shoes. hsn is just a tad under 3 turns out. idles down decent after a high speed pass.
howard85may is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
O.S. SPEED Tuned 21XZ-R John Doucakis Onroad Nitro Engine Zone 371 08-22-2017 05:44 PM
NEW OS 21 XZ-B and Speed XZ-B Marcus Falconie Offroad Nitro Engine Forum 5225 07-11-2016 06:24 PM
OS HB 21XZ-B HARA EDITION NITRO ENGINE VS os xzb SPEED turboboost Offroad Nitro Engine Forum 71 03-20-2013 11:58 AM
O.S.SPEED 21XZ-R shanem121 Offroad Nitro Engine Forum 10 06-10-2011 06:58 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 02:01 PM.


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