R/C Tech Forums

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

Reply
 
Thread Tools Search this Thread
Old 02-12-2008, 11:04 PM   #1
Tech Master
 
jrwoodchuck's Avatar
 
Join Date: Nov 2007
Location: Northampton, Massachusettes
Posts: 1,336
Default Head shims for a VZB

I have a OS VZB and just moved to the Dallas area and not sure how thick my shims should be on 30%. I came from 6000 ft and now at 600 so I know I need to add, but I don't know how many. I don't have any in now, but havn't run it. I would think that there would be alot of pre-detonation.
Thanks
__________________
Doug
TLR 22/M-11

“Looks like I picked the wrong week to quit sniffing glue.”
jrwoodchuck is offline   Reply With Quote
Old 02-12-2008, 11:11 PM   #2
Regional Moderator
 
Jon Carlson's Avatar
 
Join Date: Jun 2002
Location: North Dakota
Posts: 2,880
Trader Rating: 48 (100%+)
Default

Try one copper and one silver. Should be a good starting point.
Jon Carlson is offline   Reply With Quote
Old 02-13-2008, 04:01 AM   #3
Tech Regular
 
lowey79's Avatar
 
Join Date: Dec 2007
Posts: 356
Default

Quote:
Originally Posted by Swen View Post
Try one copper and one silver. Should be a good starting point.
That's what they come with stock isn't it? If so, for 30% i would start with 1 silver and 2 copper..... I might be wrong?
lowey79 is offline   Reply With Quote
Old 02-13-2008, 04:33 AM   #4
Tech Master
 
Join Date: Jul 2007
Location: Planet Earth, 3rd Planet from the Sun
Posts: 1,119
Trader Rating: 38 (100%+)
Default

Yup, I'd go with a silver and copper shim as a starting point....
__________________
JQ Products "Le Car" - 3 of them. Primary, back-up, and spares car
Bunch of "classic" Schumachers
Tamiya - Leopard 2A6, Tiger 1
HPI - Blitz
bushyar15 is offline   Reply With Quote
Old 02-13-2008, 05:42 AM   #5
Tech Champion
 
Davidka's Avatar
 
Join Date: Oct 2004
Posts: 9,843
Trader Rating: 75 (100%+)
Default

They come with one copper/one silver and this setting is fine for low altitude and 30% fuel. If you didn't re-shim it for altitude then you are probably fine, just begin with a richer setting to account for the heavier air were you are now.
__________________
"I have no idea what you're talking about, so here's a bunny with a pancake on it's head."

In mind and body, we're all heading towards old age. It is slower to go by bike.
Davidka is offline   Reply With Quote
Old 02-13-2008, 06:13 AM   #6
Regional Moderator
 
Jon Carlson's Avatar
 
Join Date: Jun 2002
Location: North Dakota
Posts: 2,880
Trader Rating: 48 (100%+)
Default

Yes they come with one copper and one silver. .21 engines are meant to use 30% so there is no need to adjust the shims to run 30%.
Jon Carlson is offline   Reply With Quote
Old 02-13-2008, 10:07 AM   #7
Tech Master
 
jrwoodchuck's Avatar
 
Join Date: Nov 2007
Location: Northampton, Massachusettes
Posts: 1,336
Default

got it, thanks
__________________
Doug
TLR 22/M-11

“Looks like I picked the wrong week to quit sniffing glue.”
jrwoodchuck is offline   Reply With Quote
Old 02-13-2008, 03:51 PM   #8
Nik
Tech Regular
 
Nik's Avatar
 
Join Date: Nov 2007
Location: California
Posts: 286
Trader Rating: 1 (100%+)
Default

New v-specs ship with a silver installed and an extra copper in the box. So should I use both if using 30%?
Nik is offline   Reply With Quote
Old 02-13-2008, 03:54 PM   #9
Regional Moderator
 
Jon Carlson's Avatar
 
Join Date: Jun 2002
Location: North Dakota
Posts: 2,880
Trader Rating: 48 (100%+)
Default

No Nik, they ship with a silver, copper and an extra copper.
Jon Carlson is offline   Reply With Quote
Old 02-13-2008, 04:31 PM   #10
Nik
Tech Regular
 
Nik's Avatar
 
Join Date: Nov 2007
Location: California
Posts: 286
Trader Rating: 1 (100%+)
Default

You're right, my bad. So I guess the other copper is just an extra break in shim.
Nik is offline   Reply With Quote
Old 02-14-2008, 03:37 AM   #11
Tech Regular
 
lowey79's Avatar
 
Join Date: Dec 2007
Posts: 356
Default

Ok, i'm running 25% fuel and at 200ft. I currently have 1 silver and 1 copper.

Is this set-up right or can i take out a shim?
lowey79 is offline   Reply With Quote
Old 02-14-2008, 05:49 AM   #12
Regional Moderator
 
Jon Carlson's Avatar
 
Join Date: Jun 2002
Location: North Dakota
Posts: 2,880
Trader Rating: 48 (100%+)
Default

Is it running well? Tune easy? Have plenty of power? If yes, leave it alone and drive
Jon Carlson is offline   Reply With Quote
Old 02-16-2008, 03:30 AM   #13
Tech Regular
 
lowey79's Avatar
 
Join Date: Dec 2007
Posts: 356
Default

That's about the best advice i've heard!

Cheers
lowey79 is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
Head shims to run 30% in a RB S5 motor. Mpowerz Nitro Off-Road 22 01-12-2008 05:49 PM
OS VZ-B head shims porter Onroad Nitro Engine Zone 0 08-01-2006 07:17 PM
head shims harddrive Electric Off-Road 5 12-30-2005 08:43 PM
Rb C4 head shims rrgt_kid Onroad Nitro Engine Zone 1 03-06-2004 01:59 AM
head shims and 30% question nitroaddict Nitro On-Road 4 11-12-2003 07:44 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 04:47 PM.


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