Overheating at 50 degrees?
#11
02-18-2012, 06:16 PM
Since you mention EITMS I'll assume were talking about a late model O2 controlled bike. When the ECM sees that the intake air temp is 50F, it tells the injectors to add a little more fuel to maintain the target AFR. The motor is firing a larger AF charge with every cycle so it actually generating more heat than it would at 90F ambient, albeit very slightly more. As mentioned already, it doesnt matter if you are riding in the desert or the arctic, when you stop moving you stop cooling and the heat spikes rapidly; last summer I ran into stopped construction traffic on the interstate, within about 3 minutes I watched my CHTs go from around 270F to over 340F.
#12
02-18-2012, 06:20 PM
Seasoned HDF Member
#13
02-18-2012, 06:28 PM
Since you mention EITMS I'll assume were talking about a late model O2 controlled bike. When the ECM sees that the intake air temp is 50F, it tells the injectors to add a little more fuel to maintain the target AFR. The motor is firing a larger AF charge with every cycle so it actually generating more heat than it would at 90F ambient, albeit very slightly more. As mentioned already, it doesnt matter if you are riding in the desert or the arctic, when you stop moving you stop cooling and the heat spikes rapidly; last summer I ran into stopped construction traffic on the interstate, within about 3 minutes I watched my CHTs go from around 270F to over 340F.
#16
02-18-2012, 06:57 PM
Extreme HDF Member
Join Date: Jun 2011
Location: Mountain Top, Alabama
Posts: 14,731
Received 2,524 Likes
on
1,421 Posts
#17
02-18-2012, 06:58 PM
If you idle them for an extended period of time it's possible to get into the cylinder shutoff on pretty cold days. They're air cooled, with no airflow they get hot, it's not rocket science. The only way to fix it is to run them richer than stoich, so the efficiency goes down, along with the heat generated.
That being said, even in 100* weather I haven't had problems unless I get stuck in rush hour traffic. After 15-20 minutes of no airflow it ends up kicking in.
That being said, even in 100* weather I haven't had problems unless I get stuck in rush hour traffic. After 15-20 minutes of no airflow it ends up kicking in.
#19
02-18-2012, 07:18 PM
It sounds like the EITMS, which shuts down the rear cylinder at idle when the engine reaches a certain temperature. If you want to turn that feature off, turn the ignition to "on", but don't start the engine. Roll the throttle to full closed position and hold it for 5 seconds. The process is the same to turn it back on.
actually you can change it with the engine running or not....
#20
02-18-2012, 08:01 PM
Grand HDF Member
You get stuck in stop n go traffic for 10 miles, engine will go into EITMS mode. Even if you turn off the EITMS, the engine will idle different. An oil cooler is a great investment to help even in slow moving traffic Guys I know that do regular parade duty will swap their horn for a parade fan and relocate the horn.