R/C Tech Forums

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

Reply
 
Thread Tools Search this Thread
Old 12-07-2008, 09:46 AM   #31
AE
 
Join Date: Jul 2008
Posts: 254
Default

The alcohol expands and contracts greatly depending on ambient temperature. I have always noticed my engines running a little fat when the outside temp drops about 20-30* F. My air density gauge shows more oxygen, but the motor still seems a little fat. I feel that the fluctuation in the density of the fuel (from the expanding or contracting of alcohol) is the overriding factor to the engine's tune. This is very different from ringed gasoline engines i.e. motorcycle snowmobile etc. I have noticed this phenomenon on a consistent basis. Ed?
Dyno Dan is offline   Reply With Quote
Old 12-08-2008, 11:05 AM   #32
Tech Adept
 
chunk t's Avatar
 
Join Date: Nov 2008
Location: Elgin, IL
Posts: 225
Default

If you are running near freezing or below, pipe temp is an issue. Until the pipe comes up to temp, your engine won't produce peak torque at the same RPM's as summer setting and the torque will be lower because your not able to take full effect of the scavenging or packing in the combustion chambr. So Initially you may think your engine needs to lean out to run right, but all you are really doing is quickly adding heat to the pipe. Once the pipe is up to temp the needle needs to get richend up. So I'd recommend starting fat and letting the engine & pipe work up to tem gradually.

In my experience winter driving isn't hard on the engine. It's the tuner

chunk
chunk t is offline   Reply With Quote
Old 12-20-2008, 04:43 PM   #33
Tech Regular
 
Cheezburger's Avatar
 
Join Date: Oct 2008
Location: NYC
Posts: 296
Trader Rating: 2 (100%+)
Default

Kinda late, but yea i noticed that during winter runs too. The engine actually runs so weakly that i have to set it leaner than usual.
Cheezburger is offline   Reply With Quote
Old 12-20-2008, 06:12 PM   #34
Tech Addict
 
dannyg1970's Avatar
 
Join Date: Jun 2008
Location: So Cal
Posts: 550
Trader Rating: 17 (100%+)
Default

Since we are talking about cold temps,Its been getting pretty cold out here(So Cal) go figure I have a MR tuned ninja that i have been running with Oddonnel head with great results question is should i put the Magnesium head back on being that the temps have dropped so much? It's been fine just wondering if the mag head would allow more heat.
dannyg1970 is offline   Reply With Quote
Old 12-20-2008, 07:01 PM   #35
Tech Adept
 
Join Date: Dec 2008
Location: lincoln ne
Posts: 168
Trader Rating: 1 (60%+)
Default

i would not run my engines inthe cold it is hard on them. if u do put a sock on the head to kept it running at normal heat range.
mungen is offline   Reply With Quote
Old 12-20-2008, 09:43 PM   #36
Tech Regular
 
Cheezburger's Avatar
 
Join Date: Oct 2008
Location: NYC
Posts: 296
Trader Rating: 2 (100%+)
Default

A sock?? won't it catch on fire?
Cheezburger is offline   Reply With Quote
Old 12-20-2008, 09:49 PM   #37
Tech Master
 
Join Date: Feb 2008
Location: Ontario, Canada
Posts: 1,210
Trader Rating: 3 (100%+)
Default

I tried using an RB WS7T for its first track day when the outside temps were 7 celcius. It would not stay running at all regardless of tune. Probably too much pinch. I boxed all my RC stuff up until Spring after that day.
__________________
Team HRC Raceway - http://www.hrcraceway.ca/
Semple is offline   Reply With Quote
Old 12-20-2008, 09:50 PM   #38
Tech Adept
 
Join Date: Dec 2008
Location: lincoln ne
Posts: 168
Trader Rating: 1 (60%+)
Default

no i know people that use them and its fine.
mungen is offline   Reply With Quote
Old 12-21-2008, 08:51 AM   #39
Tech Fanatic
 
r1harper's Avatar
 
Join Date: Nov 2003
Location: purvis, ms
Posts: 968
Trader Rating: 24 (100%+)
Default

the thing that confuses people about tuning in the winter is they try to get there engine to a certain temp by leaning it out. by doing this they burn it up, seen it too many times.
__________________
TEAM AKA-RCAMERICA- Novarossi, Fusion Motorsports, W.E.D Custom Paint-Byron's Fuel - Blue Groove


JESUS SAVES, WESLEY
r1harper is offline   Reply With Quote
Old 12-21-2008, 12:25 PM   #40
Tech Master
 
Charles Godwin's Avatar
 
Join Date: May 2005
Location: UK (England)
Posts: 1,127
Trader Rating: 2 (100%+)
Default

7*C, that's what we call warm over here lol . Tuning by temp sucks tbh, tune by feel, noise and amount of smoke
__________________
DXR | CML Distribution | Paint by Turnip Paint | TKRgraphics.com
Charles Godwin is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
Go-Tech Engines Thread MassiveMods Offroad Nitro Engine Forum 15106 06-26-2017 04:07 AM
Ninja Engine by GRP ogreasurada Offroad Nitro Engine Forum 1526 09-16-2013 07:13 PM
Palmaris engine thread EdwardN Onroad Nitro Engine Zone 2533 08-12-2013 10:48 AM
Serpent 710 Ron C. Nitro On-Road 23347 03-16-2010 01:47 PM
GOOD FUEL scarlet Nitro On-Road 147 03-10-2007 08:41 AM
Ninja MR21B01 Carb settings? xlgraphicspro Electric Off-Road 13 07-30-2006 06:00 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 06:44 PM.


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