Is this system to cool down the moter at lights or is it just to take the heat off the rider and does nothing to keep the moter from melting

 

Per the Moco literature "for rider comfort" I've ridden in 117 deg with eitms disabled, motor won't melt. Have 107,000 trouble free miles on that same engine.

 

Its for, when its hot and your sweating your butt off, you can hear the cool thump, thump noise come out of it...


lolol

 

it is to cool the motor internals- when active ( motor idle, no throttle input, road speed under 3 mph, so typically at a stop), the rear cylinder instead of getting fuel and spark and creating heat, will just pump air through the cylinder- that air will carry away heat from the motor internals.

previous to EITMS cop bikes were using the parade fan, and many owners tried them as well-
what's better- blowing air over the fins to remove heat- or reducing the production of heat ( or maybe a little of both)

the first production motor ( I know of) to use this type of cooling strategy was the Cadillac Northstar. Caddy didn;t know how to explain this to the public, so in ads they just said that you could drive the car 50 miles with no coolant in it- yes, in that version the 8 cylinders alternated cooling air, so the car could be driven- not far, not fast, but driven.
Cadillac had experimented with cylinder de-activation in the early 80's ( the 8/6/4), by the late 80's and the Northstar, engineers realized that cylinder deactivation could also be used for cooling.
The prime use for this in cars is fuel economy.
car motors are primarily liquid cooled

eitms is a great advance and although not intended to cool the rider, less motor heat will mean less rider roasting

on my model you can disable the eitms by rolling the throttle forward and holding while at idle- the cruise control icon will turn red, do again and the icon will turn green: eitms on

living in Phoenix ( 108º right now) I experience high temps on my bike- eitms will come on once in a while stopped in heavy traffic or what stopped at a long light when the bike has been ridden a while and it is hot.
I'm glad it's there.
On my evo I had a problem once at very high heat, I won;t ride the panhead in this.


Mike

 

 

If it's intent is to protect the motor, it would be out of the rider's control to enable or disable.

 

I see your point but it's not meant to protect the motor. The engine can run very hot without damage. From the info I've gathered, it's more of a rider comfort thing and not engine protection but they both work hand in hand. I never have mine active. The newer touring bikes have the EITMS controlled by outside air temp (80 degrees or greater) as opposed to cyl head temp on the others.

 

I think H-D may have re-phrased or dumbed- down the descriptions used in various publications from the moco.

from the 2014 Manual:

" The Engine Idle Temperature Management System (EITMS) can provide limited cooling of the rear cylinder for riders who frequently find themselves in prolonged idle conditions or traffic congestion "


Mike

 

On my '14 limited, I leave it enabled.

Even though the engine is designed to take the heat, why not enable it?

In addition to cooling the rear cylinder, it could keep the exhaust temp from rising while stopped and that is where you feel the heat. It might even save some fuel if you were in a lot of stop and go traffic.

 

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Thats why its benefitial to go after the root cause which is excessive heat by installing Wards cooling fans (cools heads & upper cyls ) along with an ultracool oil cooler that has dual elec cooling fans that does a great job cooling the oil that collectively together reduced oil temp 50+ deg on my bike.

Benefits right off the bat when oil is running 50+ deg cooler in my bike's motor on a hot day are:

* MOTOR RETAINS MUCH BETTER / HIGHER OIL PRESSURE AT HOT IDLE & AT CRUISE TOO ALL TIMES.

* MOTOR DIDNT DETONATE ANYMORE ON HD'S REC 91 0CTANE FUEL.

* SAVED MONEY ON FUEL BECAUSE I DIDNT HAVE TO USE MORE EXPENSIVE 93 OCTANE FUEL ANYMORE . AND THE 93 FUEL ONLY REDUCED DETONATION BUT DIDNT FULLY STOP IT ON HOT DAYS UNDER LOAD BUT WITH THE OIL NOW RUNNING 50 DEG COOLER (HEADS & UPPER CYLS RUNNING COOLER TOO) THAT STOPPED THE DETONATION ALL TOGETHER EVEN WHEN RUNNING THE REC BY HD LOWER 91 OCTANE FUEL.

* VALVETRAIN REMAINS QUIET.

* LESS HEAT FROM MOTOR ONTO RIDER.

* MOTOR REMAINS MORE PWR/TRQ & CRISP THROTTLE RESPONSE EVEN ON ON HOTTER DAYS

SCOTT