R/C Tech Forums

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

Thread Tools Search this Thread
Old 10-14-2008, 03:49 AM   #1
Tech Rookie
Join Date: Sep 2008
Posts: 8
Default WERKS B3 Pro blowing plugs/ to rich?

This is my first werks motor, had all .28 stock motors before this. I am running ODO 20% with mc-8 plugs JP-4 pipe, weather in hot and not humid.The first plug lasted through run in and let go, it was rich and the plug was dark brown (coil bent) I started to tune for performance but still alot of smoke, ran well and had good idle slightly low. 4 tanks around 230 plug let go same dark brown coil bent, do you think its rich oa the low and lean on hi? It has good top end botom not to bad eather, but I am to rich somewhare. I have some R5 cold and ODO 100 for now.

I have ODO 30%,ODO 99 plugs and Jp-3 on the way!
lst2inIraq is offline   Reply With Quote
Old 10-14-2008, 08:31 AM   #2
Tech Fanatic
helibrian's Avatar
Join Date: Sep 2008
Posts: 801

As I'm sure you already know, a collapsed coil usually indicates a plug that is too hot, causing pre-ingnition. In your case though, if you're running an mc-8 (you could still go colder), and still have the same issue, the cause is more likely caused by high nitro content, or too much compression. Both would also cause pre-ignition. So, your options are, to continue running 10%, shim the head, or invest in a bunch of glow plugs. I think after while your engine will loosen up a bit and this problem will go away.
You might also try going a little colder or a different brand of plug.

O.S. R5
Rossi R4 or R5
Enya #6
O'Donnell Blue

All cold plugs.

Good luck.

(edit): ok after re-reading your post, I see you're already trying different plugs and I wasted 45 minutes typing the lower half of my post.
helibrian is offline   Reply With Quote
Old 10-14-2008, 11:11 AM   #3
Tech Addict
gubbs3's Avatar
Join Date: Aug 2006
Location: MN
Posts: 623
Trader Rating: 7 (100%+)

Odd. I have run 30% with a MC-59 plug and it still lasted nearly a gallon of fuel without deforming the plug. I did start blowing plugs though after about 6 gallons of fuel when the rod or rear bearing was worn, but I didn't bother rebuilding. One thing I did notice is that every plug I pulled from the engine was always dark brown or almost black when the engine was running well. The engine got pretty poor mileage (6min) which might contribute to the blackening.

I would disassemble the motor and check the rear bearing. Make sure it is slop free. Bad bearings or worn rod are usually culprits behind blowing plugs.
gubbs3 is offline   Reply With Quote

Similar Threads
Thread Thread Starter Forum Replies Last Post
Werks Team Line Pro B7 .21 engine and Werks pipe monsaas R/C Items: For Sale/Trade 22 10-30-2008 01:44 PM
Motor gurus ? rai13 Electric Off-Road 3 12-20-2005 06:46 PM
Engine Problems LosiSuperTruck Monster Trucks 4 10-07-2005 06:40 AM
BSR Feather lite kevlar net oval capped tires Michal101 R/C Items: For Sale/Trade 7 12-01-2002 09:27 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 03:37 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