Touring Models Road King, Road King Custom, Road King Classic, Road Glide, Street Glide, Electra Glide, Electra Glide Classic, and Electra Glide Ultra Classic bikes.
Sponsored by:
Sponsored by:

Engine Temp

Old May 30, 2013 | 09:57 PM
  #1  
rkoivisto's Avatar
rkoivisto
Thread Starter
|
Road Warrior
15 Year Member
Photogenic
Photoriffic
Joined: Jun 2008
Posts: 1,437
Likes: 80
From: currently an Okie
Default Engine Temp

Last weekend I was returning from a trip to Milwaukee and I thought I would try to compare engine temperature with the lower fairing vents open and closed.
 
Reply
Old May 30, 2013 | 09:59 PM
  #2  
2black1s's Avatar
2black1s
Elite HDF Member
Joined: Nov 2010
Posts: 3,846
Likes: 171
From: Simi Valley, CA
Default

And???
 
Reply
Old May 30, 2013 | 10:10 PM
  #3  
ZUTEDUFF's Avatar
ZUTEDUFF
Outstanding HDF Member
Joined: Aug 2010
Posts: 2,144
Likes: 4
From: POLK COUNTY AMERICA
Default

I hate when aliens abduct folks when they're trying to tell a story........
 
Reply
Old May 30, 2013 | 10:11 PM
  #4  
rkoivisto's Avatar
rkoivisto
Thread Starter
|
Road Warrior
15 Year Member
Photogenic
Photoriffic
Joined: Jun 2008
Posts: 1,437
Likes: 80
From: currently an Okie
Default Fricken laptop

I hit enter and it posted.

The long and short of it is I used the power vision to watch engine temperature with the vents open and closed and saw no significant difference. I would like to know if others have done that and found the same result.

I would also like to know if anyone has compared ET with lowers installed and without lowers. I know I'm going to have to do this, but it would be nice to see others that verify what I find.
 
Reply
Old May 30, 2013 | 10:21 PM
  #5  
pat1's Avatar
pat1
Road Captain
Joined: Jun 2012
Posts: 616
Likes: 0
From: GA
Default

My RG runs cooler with the vented lowers on.
 
Reply
Old May 30, 2013 | 10:25 PM
  #6  
mkguitar's Avatar
mkguitar
Extreme HDF Member
Joined: Sep 2010
Posts: 14,744
Likes: 402
From: Phoenix '53, '88, '09 Big Twins
Default

I compared lowers on/off

105ş ambient

loop: 1 mile at 30 MPH to fwy- 9 miles at 60 MPH...off, on to ramp...9 miles at 60 MPH, 1 mile at 30 mph.

first rode the bike to get to operating temperature.

removed fairing lowers

then did loop 1

put on the fairing lowers

then loop 2

measured at the oil dipstick, temps were 25ş lower with fairing lowers in place

mike
 
Reply
Old May 30, 2013 | 10:27 PM
  #7  
Retrop's Avatar
Retrop
Outstanding HDF Member
Joined: Nov 2008
Posts: 2,034
Likes: 127
Default

Originally Posted by rkoivisto
Last weekend I was returning from a trip to Milwaukee and I thought I would try to compare engine temperature with the lower fairing vents open and closed.
He must have fallen asleep.
 
Reply
Old May 30, 2013 | 10:29 PM
  #8  
rkoivisto's Avatar
rkoivisto
Thread Starter
|
Road Warrior
15 Year Member
Photogenic
Photoriffic
Joined: Jun 2008
Posts: 1,437
Likes: 80
From: currently an Okie
Default That's what I was looking for

Originally Posted by mkguitar
I compared lowers on/off

105ş ambient

loop: 1 mile at 30 MPH to fwy- 9 miles at 60 MPH...off, on to ramp...9 miles at 60 MPH, 1 mile at 30 mph.

first rode the bike to get to operating temperature.

removed fairing lowers

then did loop 1

put on the fairing lowers

then loop 2

measured at the oil dipstick, temps were 25ş lower with fairing lowers in place

mike
Thanks, When I look at the lowers, it seems to me like they funnel air into the motor. But I've heard a lot of conflicting information on the subject. It looks like you went about it in a very systematic way.
 
Reply
HD Forum Stories

The Best of Harley-Davidson for Lifelong Riders

story-0

8 Best Harley-Davidson Motorcycles Ever

 Pouria Savadkouei
story-1

10 Worst Harley-Davidson Motorcycles Ever

 Pouria Savadkouei
story-2

Killer Custom's Jail Break Is The Breakout That Refused to Blend In

 Verdad Gallardo
story-3

Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?

 Verdad Gallardo
story-4

Harley-Davidson Reveals Super Cool Cafe Racer Concept

 Verdad Gallardo
story-5

Engraved Rebellion: Inside Bundnerbike's Glam Rock II

 Verdad Gallardo
story-6

10 Motorcycles You Should Never Buy

 Joe Kucinski
story-7

10 Things Harley-Davidson Needs to Fix in 2026

 Verdad Gallardo
story-8

Southpaw Super Glide: A Left-Hand-Drive 1979 Harley FXE Built to Fit the Rider

 Verdad Gallardo
story-9

The Best and Worst Harley-Davidson Moves of 2025

 Verdad Gallardo
Old May 30, 2013 | 10:32 PM
  #9  
mkguitar's Avatar
mkguitar
Extreme HDF Member
Joined: Sep 2010
Posts: 14,744
Likes: 402
From: Phoenix '53, '88, '09 Big Twins
Default

part 2:

the increased air flow across the motor may result in more heat removed from the motor...but directed at the rider especially the right thigh- the "blow dryer effect"

that's ok, I'd rather my motor be happier, I wear thick jeans

using the fairing adjustable deflectors to direct air into the cockpit does help

mike
 
Reply
Old May 30, 2013 | 10:38 PM
  #10  
rkoivisto's Avatar
rkoivisto
Thread Starter
|
Road Warrior
15 Year Member
Photogenic
Photoriffic
Joined: Jun 2008
Posts: 1,437
Likes: 80
From: currently an Okie
Default Lowers

Originally Posted by mkguitar
part 2:

the increased air flow across the motor may result in more heat removed from the motor...but directed at the rider especially the right thigh- the "blow dryer effect"

that's ok, I'd rather my motor be happier, I wear thick jeans

using the fairing adjustable deflectors to direct air into the cockpit does help

mike
True, but if my little experiment holds true, opening the vents has little affect on engine temp and definitely makes for more rider comfort.
 
Reply

Thread Tools
Search this Thread

All times are GMT -5. The time now is 04:06 AM.

story-0
8 Best Harley-Davidson Motorcycles Ever

Slideshow: Not every Harley gets it right, but these are the ones that genuinely earned their reputation.

By Pouria Savadkouei | 2026-04-15 14:23:21


VIEW MORE
story-1
10 Worst Harley-Davidson Motorcycles Ever

Slideshow: From the troubled AMF years to modern misfires, these bikes earned reputations for reliability issues, questionable engineering, or disappointing performance.

By Pouria Savadkouei | 2026-04-01 20:01:09


VIEW MORE
story-2
Killer Custom's Jail Break Is The Breakout That Refused to Blend In

Slideshow: Killer Custom's "Jail Breaker" build focuses more on stance and visual aggression than mechanical overhaul.

By Verdad Gallardo | 2026-03-18 19:20:32


VIEW MORE
story-3
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?

Slideshow: The Swiss custom shop has taken a Harley Softail and stretched it into something so long and low that it looks closer to a rolling sculpture than a conventional motorcycle.

By Verdad Gallardo | 2026-03-07 16:15:30


VIEW MORE
story-4
Harley-Davidson Reveals Super Cool Cafe Racer Concept

Slideshow: Harley-Davidson's new RMCR concept revives the café racer formula with modern hardware-and it may be exactly the reset the company needs.

By Verdad Gallardo | 2026-03-04 12:23:37


VIEW MORE
story-5
Engraved Rebellion: Inside Bundnerbike's Glam Rock II

Slideshow: A standard cruiser becomes an intricate metal canvas in the hands of a Swiss custom house known for pushing Harley-Davidson platforms far beyond their factory brief.

By Verdad Gallardo | 2026-02-24 18:19:44


VIEW MORE
story-6
10 Motorcycles You Should Never Buy

Slideshow: There is no shortage of great motorcycles to buy, but we would avoid these ten.

By Joe Kucinski | 2026-02-19 14:50:51


VIEW MORE
story-7
10 Things Harley-Davidson Needs to Fix in 2026

Slideshow: Harley-Davidson's challenges aren't abstract; they show up in dropping shipments, shrinking dealer traffic, and strategic decisions that aren't yet translating into growth.

By Verdad Gallardo | 2026-01-13 18:33:17


VIEW MORE
story-8
Southpaw Super Glide: A Left-Hand-Drive 1979 Harley FXE Built to Fit the Rider

Slideshow: Graeme Billington's left-hand-drive Shovelhead is as much about problem-solving as it is about classic Harley form.

By Verdad Gallardo | 2025-12-30 11:27:08


VIEW MORE
story-9
The Best and Worst Harley-Davidson Moves of 2025

Slideshow: A clear-eyed look at what actually worked for Harley this year, and what quietly undermined its progress.

By Verdad Gallardo | 2025-12-29 17:10:48


VIEW MORE