Cold weather effect......

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Oct 17, 2013 | 03:47 AM

#11

dickey

Seasoned HDF Member

Joined: Mar 2010

Posts: 19,982

Likes: 6,110

From: Florida

Yes; just noticed it tonight, although "cold" in Florida means mid to upper 70s.

Seems more noticeable with carb than EFI.

Oct 17, 2013 | 04:15 AM

#12

ghira75

Road Warrior

Joined: Sep 2011

Posts: 1,311

Likes: 1

From: -

Quote:

Originally Posted by Cheeto

I'm no scientist but by what I understand: Cold air = more dense which means more oxygen. More oxygen = more intense burn = more power/better running.

Exactly !

Oct 17, 2013 | 05:34 AM

#13

IronAss

Seasoned HDF Member

Joined: Apr 2008

Posts: 23,053

Likes: 12,327

From: Arkansas

I'm gonna start hanging a bag of ice on my ac in the spring so I can get the effect longer as the weather starts heating back up.

Oct 17, 2013 | 09:57 AM

#14

big cahuna

Grand HDF Member

Joined: Mar 2007

Posts: 4,923

Likes: 266

From: Deep in the heart of New Jersey

Quote:

Originally Posted by IronAss

I'm gonna start hanging a bag of ice on my ac in the spring so I can get the effect longer as the weather starts heating back up.

Man that will never work. What you need is a 72 qt cooler with a big block of ice. Drill a hole in one side of it and bolt it up to the air cleaner base.Then drill another hole on the other side for the air cleaner cover. Might stick out some, but you'll get used to it. Man what power!!!!!!!!!!!!!!!

Oct 17, 2013 | 10:04 AM

#15

Sharkman73

Outstanding HDF Member

Joined: Aug 2011

Posts: 2,325

Likes: 7

From: SE Illinois

Yup, I'm in agreement with everyone else...cooler denser air will make more power. I notice it, especially in cool dry air my bike runs noticeably better than it does when it's 95 & humid as hell.
Just another reason fall is the best riding season here.

Oct 17, 2013 | 10:12 AM

#16

02DynaHH

Tourer

Joined: May 2010

Posts: 285

Likes: 13

From: FL

Quote:

Originally Posted by bdtaylor1979

The cooler air does help your bike run better and gives you a slight increase in power. This is why people put nitrous on their vehicles because the nitrous cools off the air going into the engine which give you more power.

that is not 100% correct, it does cool the charge, but the main power increase comes from the fact that nitrous is an oxidizer(sp?)… more available oxygen=more fuel can be burned=more power.

Same theory applies to the cold weather, cold air is denser which means it has a higher oxygen content per unit of volume (assuming altitude stays the same) which=more power.

I remember back in the day I had a 80 camaro with a holley 750dp carb… that thing was so finicky I had to retune depending on what time of day it was. Hot and humid summer day->cool (not as humid) summer night really screwed with that thing.

EDIT: for more info read up on the Density Altitude calculation (DA). takes into account the atmospheric conditions that affect internal combustion engines.

Last edited by 02DynaHH; Oct 17, 2013 at 10:16 AM.

Oct 17, 2013 | 01:03 PM

#17

longrideshields-1

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Joined: Jul 2009

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From: Sparks NV

I definitely notice this too in both my bikes. But, I have never noticed a difference in my car or truck. Any theories on this??

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Oct 17, 2013 | 01:21 PM

#18

HDmikie

Thread Starter

Outstanding HDF Member

Joined: Sep 2011

Posts: 3,255

Likes: 112

From: Florida

Quote:

Originally Posted by longrideshields-1

I definitely notice this too in both my bikes. But, I have never noticed a difference in my car or truck. Any theories on this??

I'm thinking because your car is liquid cooled and runs at the same temp all the time. Most Harleys are air cooled so outside temps determine how hot or cool your bike runs. JMO

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Oct 17, 2013 | 01:24 PM

#19

TimmH

Cruiser

Joined: Jul 2011

Posts: 144

Likes: 0

From: South Florida

Quote:

Originally Posted by longrideshields-1

I definitely notice this too in both my bikes. But, I have never noticed a difference in my car or truck. Any theories on this??

I notice it in my Mustang, but it has been retuned and has a Cold Air Kit, so when the temp drops into the 50's in 60's in South Florida, I notice a difference from when it's in the 80's and 90's. The car is just more responsive.