lowers and air flow
Elite HDF Member
Joined: Jun 2006
Posts: 3,698
Likes: 11
From: Longview, Washington
supposedly, Hogg Chopps direct MORE air to the motor.
LOOK . . .
http://www.hoggchopps.com/hoggTech.htm
LOOK . . .
http://www.hoggchopps.com/hoggTech.htm
Road Master
Joined: Aug 2007
Posts: 815
Likes: 0
From: GA
I usually take them off in warmer temps. According to the manual and service book for my 07 UC it cautions that the lowers are NOT to be used at temps above 50 degrees F.
That being said with my super tuner and a good tune I have not had any more heat problems with or without them on. I do find that I like the way the air flows much better with them off, while they are on I seem to get more air pushing up from around the bottom than I perfer.
That being said with my super tuner and a good tune I have not had any more heat problems with or without them on. I do find that I like the way the air flows much better with them off, while they are on I seem to get more air pushing up from around the bottom than I perfer.
Ultimate HDF Member
Joined: Jun 2009
Posts: 6,932
Likes: 4
From: 46th State, USA
I don't know much about this but I've been told by a much more experienced Harley owner that the design of the lowers actually force more air into the front cylinder area than it would without the lowers. Also, I don't remember reading that Harley recommends to remove the lower in hot weather.
Road Master
Joined: Aug 2007
Posts: 815
Likes: 0
From: GA
Check the HD web site for the lowers you can purchase and there will be a NOTE or WARNING link you can click that states the 50 degree warning. It is also in the owners manual for my 07.
All that being said when they are on it does shove a boatload of air to the heads, especially with the vents opened up and they are good about keeping road wash off the legs in the rain.
With the heat I had before the super tuner and a good tune I can see where HD might not want them on above those temps, damn things about roasted my eggs!!
All that being said when they are on it does shove a boatload of air to the heads, especially with the vents opened up and they are good about keeping road wash off the legs in the rain.
With the heat I had before the super tuner and a good tune I can see where HD might not want them on above those temps, damn things about roasted my eggs!!
Tourer
Joined: Feb 2007
Posts: 388
Likes: 3
I have vented lowers on my bike and take them off in hot weather.I have an oil cooler and temp gauge and they definately restrict air to motor.I would say 10 to 20 degrees hotter.By the way these are the newer vented lowers which I run wide open in warmer weather.
Outstanding HDF Member
Joined: Dec 2009
Posts: 2,502
Likes: 6
From: Lapeer , Mich
I asked the Dealer when I bought my UC. He said the lowers didn't restrict air to the engine at all. in fact it is designed to put more air on the engine. They are designed to keep wind and rain off the riders legs when closed. The adjustable air wings on the bat wing fairing is designed to put more air on the rider. Dealer told me this!!!
Seasoned HDF Member
Joined: Jan 2006
Posts: 11,476
Likes: 3,004
From: Charleston, SC
I take them off in summer just so my legs will be more comfortable. I also run a shorter windshield during that time as well.
I likey the wind as long as there is no turbulence. Present bike - a road glide - no turbulence.
Win for me.
lp
I likey the wind as long as there is no turbulence. Present bike - a road glide - no turbulence.
Win for me.
lp
This is what I though as well.
Wish I had vents on my 99 Ultra.
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Cruiser
Joined: Apr 2008
Posts: 170
Likes: 9
From: Pittsburgh, PA
I don't know much about this but I've been told by a much more experienced Harley owner that the design of the lowers actually force more air into the front cylinder area than it would without the lowers. Also, I don't remember reading that Harley recommends to remove the lower in hot weather.
Ultimate HDF Member
Joined: Mar 2009
Posts: 6,146
Likes: 471
From: along the Front Range in Colorado
Non-Vented Fairing Lower Kit P# 58830-88
Made from tough, lightweight vacuum-formed ABS, these fairing lowers protect the rider from the elements and direct cooling air to the engine.
Protective Soft Lowers P# 58502-80C
Constructed of reinforced vinyl with polyester backing and black snaps. Install on engine guard for protection against the elements. Easy installation and removal. Should not be used when air temperature is above 50 degrees.
Made from tough, lightweight vacuum-formed ABS, these fairing lowers protect the rider from the elements and direct cooling air to the engine.
Protective Soft Lowers P# 58502-80C
Constructed of reinforced vinyl with polyester backing and black snaps. Install on engine guard for protection against the elements. Easy installation and removal. Should not be used when air temperature is above 50 degrees.