R/C Tech Forums

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

Reply
 
Thread Tools Search this Thread
Old 06-12-2009, 10:50 PM   #1
Gen
Tech Regular
 
Gen's Avatar
 
Join Date: Oct 2007
Location: Perth Australia
Posts: 351
Trader Rating: 12 (100%+)
Default removeing shims ??

is it smart or silly to remove a shim ,on todays hi powered engines to get a bit more grunt ,running a 21 cobra axe rossi and wanted a bit more push for my truggy can i remove a shim for easy fix or no ??
__________________
Kyosho MP9 tki3
Kyosho Strr Evo
Os engines
Vp race fuel
Futaba 4pks
Gen is offline   Reply With Quote
Old 06-12-2009, 11:17 PM   #2
Tech Adept
 
what_stanger?'s Avatar
 
Join Date: Mar 2009
Location: Northern IL
Posts: 138
Trader Rating: 8 (100%+)
Send a message via AIM to what_stanger?
Default

I'm guessing it would be like advancing the timing on your car without running higher octane. (detonation/pre-ignition)

I'm not positive, so i'd wait for further comments from other guys.
what_stanger? is offline   Reply With Quote
Old 06-13-2009, 07:53 AM   #3
Tech Addict
 
Join Date: Oct 2008
Location: Foley, Al
Posts: 516
Trader Rating: 1 (100%+)
Default

Ive always been told to use the proper shimming for the type of fuel you are running so this would go against the grain. I dont know the complete principal for this but it has to do with detination of the fuel. It sounds good but Im gonna stick with what the engine builders say.

.60 = 20 % fuel
.70 = 25 % fuel
.80 = 30 % fuel
__________________
Making a comeback !!
roadracer43 is offline   Reply With Quote
Old 06-13-2009, 07:55 AM   #4
Tech Addict
 
Join Date: Oct 2008
Location: Foley, Al
Posts: 516
Trader Rating: 1 (100%+)
Default

Your pipe combo should fix the problem.
__________________
Making a comeback !!
roadracer43 is offline   Reply With Quote
Old 06-13-2009, 08:27 AM   #5
Tech Addict
 
Join Date: Apr 2009
Location: Hayward CA
Posts: 702
Trader Rating: 32 (100%+)
Default

on my OS speed, removing shim gave more bottom, but lost some top end rpm
and ran hotter.

when tuned right, overall power was same
devilchrist is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
1/8th scale Motonica smac Nitro On-Road 1830 01-16-2012 09:34 PM
Manual Com Lathe or Auto kang45 Rookie Zone 7 01-24-2006 09:32 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 03:45 PM.


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