14 Limited EITMS changes
I notice on my bike when the air temp gauge gets a little past 100 (and yes I know it is not accurate) then the parade mode cuts on when I am stopped. My friends 2012 SG does the exact same thing.
I am under the impression that the head temp is what triggers the parade mode, I can judge when it is going to happen by keeping an eye on the air temp gauge.
I am under the impression that the head temp is what triggers the parade mode, I can judge when it is going to happen by keeping an eye on the air temp gauge.
Seasoned HDF Member
Joined: Jan 2006
Posts: 11,463
Likes: 2,990
From: Charleston, SC
Next time you get back from a ride on a hot day, turn off the bike. Now you have shut down BOTH heads thus "cooling" both head pipes. Wait a couple minutes and put your hand on the pipe and honestly tell me you think they are any "cooler". Again, EITMS helps prevents it getting hotter. Only extended period of time or cold water is going to cool them down.
When the cylinder is not firing it also acts like an air pump pulling heat and expelling it and thus cooling the rear cylinder and pipe which is kinda cool (no pun intended) and different than just turning the bike off.
That said, overall it doesn't work all that well and it's hardly a "seamless transition" as they say.
lp
Road Warrior
Joined: Jun 2006
Posts: 1,993
Likes: 20
From: Southeast GA
Touching the pipe minutes later would be less temp than if it was still firing which in my book is "cooler". Still hot as hell but I think the point is the whole thing is for lowering the temp at the riders seating area which has a by product of lowering overall engine temp since 50% of the heat generating mech has been shutdown. Splitting hairs here. We are both saying the same thing in a way.
When the cylinder is not firing it also acts like an air pump pulling heat and expelling it and thus cooling the rear cylinder and pipe which is kinda cool (no pun intended) and different than just turning the bike off.
That said, overall it doesn't work all that well and it's hardly a "seamless transition" as they say.
lp
When the cylinder is not firing it also acts like an air pump pulling heat and expelling it and thus cooling the rear cylinder and pipe which is kinda cool (no pun intended) and different than just turning the bike off.
That said, overall it doesn't work all that well and it's hardly a "seamless transition" as they say.
lp
Tourer
Joined: Mar 2010
Posts: 430
Likes: 2
From: Dirty City
Actually Harley marketed it as a way to help "Cool" the motor as well for rider comfort. You can find that in the marketing info like below.
"During hot idle, or when the motorcycle is off-throttle and running at hot temperatures, EITMS shuts off fuel to the engines rear cylinder, leaving it to idle on the front cylinder only. Without combustion, the rear cylinder and exhaust header will begin to cool, bringing relief to the rider (and passenger) soon after. Once the rear cylinder cools to a predetermined temperature, or as soon as the rider accelerates, both cylinders resume operation. And by maintaining constant rpm during rear cylinder shutdown, transitions between one and two cylinder operation are nearly seamless.
EITMS is purely for rider comfort. When it activates and shuts off the rear cylinder, its not because the motor is overheating. Its designed to reduce the heat radiating from the rear cylinder to the rider."
http://www.harley-davidson.com/en_US...conditions.pdf
lp
"During hot idle, or when the motorcycle is off-throttle and running at hot temperatures, EITMS shuts off fuel to the engines rear cylinder, leaving it to idle on the front cylinder only. Without combustion, the rear cylinder and exhaust header will begin to cool, bringing relief to the rider (and passenger) soon after. Once the rear cylinder cools to a predetermined temperature, or as soon as the rider accelerates, both cylinders resume operation. And by maintaining constant rpm during rear cylinder shutdown, transitions between one and two cylinder operation are nearly seamless.
EITMS is purely for rider comfort. When it activates and shuts off the rear cylinder, its not because the motor is overheating. Its designed to reduce the heat radiating from the rear cylinder to the rider."
http://www.harley-davidson.com/en_US...conditions.pdf
lp
However, EITMS does not decrease the total amount of heat produced, nor does it slow the rate at which the motor as a whole heats up. The front cylinder has to do the same work that was spread out over two cylinders previously, so it heats up faster while the rear cylinder cools. You're going through just as much fuel at the same air:fuel ratio and therefore generating just as much total heat.
Since the front cylinder is further from the rider, its heat is lost through radiation and convection more to the atmosphere than to the rider.
Intermediate
Joined: May 2013
Posts: 46
Likes: 1
From: Frisco, TX
My RK its a very seamless transition, i see no difference on take off from either condition.
Extreme HDF Member
Joined: Nov 2007
Posts: 14,670
Likes: 139
From: East of the Sun, West of the Moon
as does mine. you do not have to "crack the throttle" to turn it off. Simply accelerate normally.
Stellar HDF Member
Joined: Aug 2007
Posts: 2,052
Likes: 341
From: Virginia Beach
I saw one at the dealer, running, and it went into heat management relatively quickly. I think they changed the temperature settings. I could touch the rear cylinder rocker box with my hand. The radiator fans were not running. Anyone have the owners manual?
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Seasoned HDF Member
Joined: Jan 2006
Posts: 11,463
Likes: 2,990
From: Charleston, SC
Sort of. Harley marketed it as a way to cool the rear cylinder specifically, not the motor overall, and to keep the rider cooler. This is what is stated in the quote above.
However, EITMS does not decrease the total amount of heat produced, nor does it slow the rate at which the motor as a whole heats up. The front cylinder has to do the same work that was spread out over two cylinders previously, so it heats up faster while the rear cylinder cools. You're going through just as much fuel at the same air:fuel ratio and therefore generating just as much total heat.
Since the front cylinder is further from the rider, its heat is lost through radiation and convection more to the atmosphere than to the rider.
However, EITMS does not decrease the total amount of heat produced, nor does it slow the rate at which the motor as a whole heats up. The front cylinder has to do the same work that was spread out over two cylinders previously, so it heats up faster while the rear cylinder cools. You're going through just as much fuel at the same air:fuel ratio and therefore generating just as much total heat.
Since the front cylinder is further from the rider, its heat is lost through radiation and convection more to the atmosphere than to the rider.
The same amount of heat (from combustion) cannot be coming off the engine from one cylinder. Thus... it's not generating the same amount of heat and that is a loose translation for "running cooler" than if the engine was on two cylinders. Blah, Blah, Blah right? It's still killer hot.
Now will the engine be 50% cooler? No, because each cylinder generates more heat than it's fins can dissipate at stand still. Which is where everyone is pointing out that all the EITMS does is decrease the Rate in which the engine overheats.
Still it's a little cooler at the legs, but not by much.
lp
Last edited by lp; Aug 30, 2013 at 12:27 PM.