MPG going down during cold weather... - Triumph Forum: Triumph Rat Motorcycle Forums

Air Cooled Twins Technical Talk Technical Talk for Hinckley Triumph Twins: Bonneville, T100, Speedmaster, America, Thruxton, and Scrambler.

Reply
 
LinkBack Thread Tools Display Modes
post #1 of 21 (permalink) Old 01-02-2013, 09:30 PM Thread Starter
JAG
Senior Member
SuperStock
Main Motorcycle: 2006 Bonneville T-100
 
Join Date: Sep 2011
Location: Los Angeles
Posts: 241
MPG going down during cold weather...

I've noticed a significant drop in my MPG during slightly colder weather here in Socal. Does everyone experience this, or is the cold weather showing how badly my bike isn't tuned properly? I've been messing with jet sizes for a while now, and while my performance and mpg has increased slightly from when I bought it (previous re-jet was a joke), I still haven't felt its been at its best. I haven't been able to bring it over to get dyno'd or analyzed, so I'm going mostly on feel and from reading threads here.

What say you?
JAG is offline  
Sponsored Links
Advertisement
 
post #2 of 21 (permalink) Old 01-02-2013, 09:35 PM
Lifetime Premium
Site Supporter
SuperBike
Main Motorcycle: 2007 Bonnie T100
 
bonza's Avatar
 
Join Date: Sep 2007
Location: Melbourne, Australia
Posts: 1,514
Other Motorcycle: Jeep Wrangler
Garage
I know that if I ride infrequently and for only fairly short distances, as is often the case during winter, my MPG deteriorates.

2007 Tuxedo T100.
Dom Tourers, TTP breathe, DNA filter,baffle gone, 40/140/1 shim 3 turns, TTP igniter tune, Hagon Nitros, Pingel fuel valve, Monza gas cap, Burton seat, Avon Roadriders
I like a man who grins when he fights -
Winston Churchill
bonza is offline  
post #3 of 21 (permalink) Old 01-02-2013, 10:34 PM
Lifetime Premium
Site Supporter
Formula Extreme
Main Motorcycle: 2012 Bonneville T-100
 
FasTriumph's Avatar
 
Join Date: May 2009
Location: St Paul
Posts: 697
Other Motorcycle: '96 Trophy 1200
My 96 Trophy 1200 would drop from 42 mpg to 35 mpg, summer vs winter. I rode more cautiously in the winter in Minnesota, so the drop in mpg from 70 degrees to 30 degrees F was the real deal. I won't take my Bonneville out in the ice and snow. My last ride on Dec 2 was in 45 degree weather. I got a few less miles on that tank, going from 180 to 165. My gas mileage always suffers due to my tendency to twist that throttle a bit aggressively.

I definitely see a drop in mileage due to cold weather. YMMV.

John F
1996 Trophy 1200 BRG
2012 Bonneville T-100 Phantom Black & Graphite
FasTriumph is offline  
post #4 of 21 (permalink) Old 01-03-2013, 12:14 AM
Senior Member
Formula Extreme
Main Motorcycle: 2014 TBird
 
scottslob's Avatar
 
Join Date: Dec 2009
Location: La quinta Ca.
Posts: 430
Other Motorcycle: 2014 Fxdx, wifeys
yupper...

Friend of Bill's
scottslob is offline  
post #5 of 21 (permalink) Old 01-03-2013, 12:35 AM
Super Moderator
Site Supporter
Nova
Main Motorcycle: Custom 955 Speed-Tona
 
DEcosse's Avatar
 
Join Date: Feb 2005
Location: Pleasanton CA
Posts: 18,913
Garage
It's not so much the cold weather - it's predominantly because of the winter fuel blend

On EFI bikes, they will also deliver more fuel with colder air.



Sent from my iPhone using Motorcycle.com Free App
DEcosse is online now  
post #6 of 21 (permalink) Old 01-03-2013, 09:13 AM
Lifetime Premium
Site Supporter
Team Owner
Main Motorcycle: 1968 Bonneville T120R
 
68T120R's Avatar
 
Join Date: Jun 2010
Location: Denver, Colorado United States Of America
Posts: 5,709
Other Motorcycle: 2010 Jet Black T100
Extra Motorcycle: 2013 Black Tiger 800
Garage
^ The winter fuel blend definately causes a drop in fuel mileage...also you probably warm your bike up for a longer period of time before jumping on to ride. I know I do when the temp's are in the 40's so that also is a contributing factor to a drop in fuel mileage...both factors are for me.

Bob

Nulli Secundus
68T120R is offline  
post #7 of 21 (permalink) Old 01-03-2013, 01:28 PM
New Member
Grand Prix 125
Main Motorcycle: 2012 Thruxton
 
Join Date: Jul 2012
Location: Smyrna, GA
Posts: 22
LOL - cold weather in SoCal.


Sent from my iPhone using Motorcycle.com Free App
haywookp is offline  
post #8 of 21 (permalink) Old 01-03-2013, 03:12 PM
Lifetime Premium
Site Supporter
Team Owner
Main Motorcycle: 1968 Bonneville T120R
 
68T120R's Avatar
 
Join Date: Jun 2010
Location: Denver, Colorado United States Of America
Posts: 5,709
Other Motorcycle: 2010 Jet Black T100
Extra Motorcycle: 2013 Black Tiger 800
Garage
I guess to folks in SoCal temp's in the upper 50's and 60's on a regular basis in the winter months is cold...dunno.

Bob

Nulli Secundus
68T120R is offline  
post #9 of 21 (permalink) Old 01-03-2013, 03:40 PM
Senior Member
Team Owner
Main Motorcycle: 2006 Bonneville T100
 
road dog's Avatar
 
Join Date: Jul 2006
Location: The Lone ☆ State
Posts: 4,597
Other Motorcycle: 2002 ThunderBird 900
Extra Motorcycle: 1982 CB900F SuperSport
A few excerpts taken from this article. Some you may have never thought about.

Lower average engine temperature
In the winter, an engine takes longer to reach operating temperature and cools off faster when shut off. Since the engine management system orders up a richer mixture when cold (proportionately more fuel in the air/fuel combination), more fuel is being burned overall.

Higher average lubricant viscosity
Engine oil thickens as it cools. So does transmission and differential fluids and even bearing grease. Significantly more energy is needed to overcome the added drag these cold lubricants cause. Using synthetic fluids can address this problem, since their viscosity changes less at extreme temperatures than traditional mineral fluids.

Weaker gasoline
Gasoline doesn't vaporize readily at very cold temperatures. So oil companies formulate fuel differently for cold-weather markets in the winter. Unfortunately, the changes that provide better cold vaporization characteristics also result in less available energy for combustion. You won't get as far on a liter of winter gas as you will on a liter of summer gas.

More aerodynamic drag
No, I'm not referring to the layer of snow you're too lazy to brush off the top of the car (though that would hurt mpg too).
A vehicle’s aerodynamic drag is proportional to air density, and the density increases as temperature drops. For every 10 degree F drop in temperature, aerodynamic drag increases by 2%

.
-
road dog is offline  
post #10 of 21 (permalink) Old 01-03-2013, 04:18 PM
Senior Member
Formula Extreme
Main Motorcycle: Rebuilt 1993 Trophy 900
 
alexibrow's Avatar
 
Join Date: Dec 2012
Location: Worthing, UK
Posts: 830
I get better mpg in winter in (uk), no question.

I think it's mostly to do with me being gentler with the throttle on greasy roads, but I wondered if it also might have something to do with being able to get more oxygen into the engine for a given intake cycle (air is denser).

This may only be true for carburated engines, don't know.

Sent from my pet cat using pheromones.
alexibrow is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options
All posts must adhere to Forum Rules

Register Now



In order to be able to post messages on the Triumph Forum: Triumph Rat Motorcycle Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter your valid email address, that can receive an automated confirmation message. Otherwise, you won't be able to gain full access.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Similar Threads
Thread Thread Starter Forum Replies Last Post
My CE does not like cold weather!! Marks Daytona Daytona Deliberations 18 06-02-2011 06:56 AM
Cold Weather Riding - How Cold is too Cold? canuck3134 Classic, Vintage & Veteran 21 11-24-2009 08:19 PM
Cold Weather/Cold Tires LoVel Biker Hang-Out 6 11-19-2008 06:42 PM
Cold weather is here Cburt Speed Triple Forum 6 12-02-2007 10:23 AM
Cold Weather?? wonderdog Biker Hang-Out 11 01-30-2007 08:58 AM

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 Off
Pingbacks are Off
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome