What temp range should the exhaust manifolds be at during idle??

[pcoakle1]

Hi all,

I am seeing some possible discoloration in my exhaust and wondering if someone could take a temp of their manifolds and the pipe behind the right footpeg. That is where it looks like the pipe is getting hot.

What is a normal temp for the exhaust system in these areas? Whether stock or aftermarket after about 2 minutes of runnin at idle?

Thanks.

[Sputniks]

Your exhaust temperature normally fluctuates over the day, with the lowest levels around 4 a.m. and the highest in the late afternoon, around 4:00 p.m. (assuming the motorcycle is parked at night and ridden during a day). Therefore, an exhaust temperature of 199.0 °F would, strictly speaking, be normal in the afternoon but not in the morning. An exhaust's pipe temperature typically changes by about 109 °F between its highest and lowest points each day.

The exhaust pipe's temperature also varies with the change of seasons during each year. This pattern is called a circannual rhythm. Studies of seasonal variations have produced inconsistent results. Streetfighter ridden in different climates may have different seasonal patterns.

An exhaust temperature is sensitive to many factors, so Ducati Streetfighters have a temperature rhythm that varies with the circamensal rhythm. Streefighter's exhaust temperature rises sharply right after a tank filled with a gas, as an fuel/air ration decreases and o2 increases. The Ducatist awareness programs use this predictable change to identify when a motorcycle is able to become hot. During the "phase of such cycle, both the lowest and the average temperatures are slightly higher than during other parts of the cycle. However, the amount that the temperature rises during each day is slightly lower than typical, so the highest temperature of the day is not very much higher than usual. Not ridding at all suppress the circamensal rhythm and raise the typical exhaust temperature by about 11.1 °F.

Increased riding increases the amount of daily variation in temperature.

With increased age, both average exhaust temperature and the amount of daily variability in the pipe temperature tend to decrease. Older bikes may have a decreased ability to generate exhaust heat during the track days, so even a somewhat elevated temperature can indicate a serious underlying cause of mechanic failures.

[pcoakle1]

Wow, soooooo helpful. Thanks.

[Sputniks]

Glad to help

Here is the source of the info:

http://en.wikipedia.org/wiki/Normal_...dy_temperature

[FlyingQ]

My guess (and that's all it is) is that the forward of the two pipes behind the right foot peg area comes off the vertical cylinder and loops back around to meet up with the horizontal cylinder's pipe prior to the exhaust flapper valve. Is it possible that the flapper valve being closed at idle power is causing the exhaust gases to back up in the header and possibly generating excess heat? I removed that valve long ago, so I can't recall it's correct position during idle operations. Anyone know? How does the bike run?

How discolored is it? They will always discolor a bit after a couple of hundred miles. Can you post a pic?

Sorry, I don't have a IR heat meter, so I can't help you out with the surface temp of the pipe.

[FlyingQ]

Sputs, that was pretty good.

[Bigmacholdthefries]

Originally Posted by Sputniks

Your exhaust temperature normally fluctuates over the day, with the lowest levels around 4 a.m. and the highest in the late afternoon, around 4:00 p.m. (assuming the motorcycle is parked at night and ridden during a day). Therefore, an exhaust temperature of 199.0 °F would, strictly speaking, be normal in the afternoon but not in the morning. An exhaust's pipe temperature typically changes by about 109 °F between its highest and lowest points each day.

The exhaust pipe's temperature also varies with the change of seasons during each year. This pattern is called a circannual rhythm. Studies of seasonal variations have produced inconsistent results. Streetfighter ridden in different climates may have different seasonal patterns.

An exhaust temperature is sensitive to many factors, so Ducati Streetfighters have a temperature rhythm that varies with the circamensal rhythm. Streefighter's exhaust temperature rises sharply right after a tank filled with a gas, as an fuel/air ration decreases and o2 increases. The Ducatist awareness programs use this predictable change to identify when a motorcycle is able to become hot. During the "phase of such cycle, both the lowest and the average temperatures are slightly higher than during other parts of the cycle. However, the amount that the temperature rises during each day is slightly lower than typical, so the highest temperature of the day is not very much higher than usual. Not ridding at all suppress the circamensal rhythm and raise the typical exhaust temperature by about 11.1 °F.

Increased riding increases the amount of daily variation in temperature.

With increased age, both average exhaust temperature and the amount of daily variability in the pipe temperature tend to decrease. Older bikes may have a decreased ability to generate exhaust heat during the track days, so even a somewhat elevated temperature can indicate a serious underlying cause of mechanic failures.

Wow Sputz, you've been watching way to much Discovery channel.