Variation in engine heat - Wrist Twisters
 
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post #1 of 15 Old 10-07-2010, 11:45 AM Thread Starter
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Variation in engine heat

Hey guys, I did a quick search and didn't find anything that related to this. As I was riding to school this morning, my hands were a tad bit chilly with no gloves in 45 degree weather so I placed them on the sides of my block at a stop light to warm them up a little. I noticed that the left side of the block was quite a bit warmer than the right side after 10 minutes of riding. Is this normal?

This question might also be spurring from a decline in power that I have noticed recently. A couple weeks ago, I was able to do a preloaded wheelie in first gear pretty easily, and now it struggles getting off the ground.

Is this all in my head? I wonder how much the colder air it has been recently has would affect it.

Any help is MUCH appreciated!

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post #2 of 15 Old 10-07-2010, 11:49 AM
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Check compression.

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post #3 of 15 Old 10-07-2010, 11:57 AM
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post #4 of 15 Old 10-07-2010, 12:34 PM
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Quote:
Originally Posted by OSIRIS View Post
Hey guys, I did a quick search and didn't find anything that related to this. As I was riding to school this morning, my hands were a tad bit chilly with no gloves in 45 degree weather so I placed them on the sides of my block at a stop light to warm them up a little. I noticed that the left side of the block was quite a bit warmer than the right side after 10 minutes of riding. Is this normal?

This question might also be spurring from a decline in power that I have noticed recently. A couple weeks ago, I was able to do a preloaded wheelie in first gear pretty easily, and now it struggles getting off the ground.

Is this all in my head? I wonder how much the colder air it has been recently has would affect it.

Any help is MUCH appreciated!
The left side should be hotter as the right has the cam chain drive cavity.
Engines don't make power until the metal, coolant and oil is all nice and hot, as until it does, too much of the burn energy ends up being heat transfer energy instead of power. There could also be some power softening from timing and/or AF ratio as well.
Where was the temp gauge ?

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post #5 of 15 Old 10-07-2010, 12:41 PM Thread Starter
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Quote:
Originally Posted by mcromo44 View Post
The left side should be hotter as the right has the cam chain drive cavity.
Engines don't make power until the metal, coolant and oil is all nice and hot, as until it does, too much of the burn energy ends up being heat transfer energy instead of power. There could also be some power softening from timing and/or AF ratio as well.
Where was the temp gauge ?
My temp gauge rarely floats up from the bottom unless it is a hot day and I'm at a stop light. This morning, didn't even think about moving.

I will need to check compression and I just put in brand spankin new plugs a couple months ago (edit: could be wires I guess tho... never checked those.)

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post #6 of 15 Old 10-07-2010, 12:48 PM
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your fine.... if its running smooth and strong you have nothing to worry about... its a 919 for goodness sake... the only thing that goes wrong is the FPR on occasion.

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post #7 of 15 Old 10-07-2010, 01:10 PM
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Quote:
Originally Posted by OSIRIS View Post
My temp gauge rarely floats up from the bottom unless it is a hot day and I'm at a stop light. This morning, didn't even think about moving.

I will need to check compression and I just put in brand spankin new plugs a couple months ago (edit: could be wires I guess tho... never checked those.)
You are surely going to be wasting your time doing a compression check.
With gauge readings like that, your engine mass, oil and water are all in heat sink mode.

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post #8 of 15 Old 10-07-2010, 01:15 PM
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Gauge at the little mark at the bottom is normal, especially when cooler.

Colder air makes more horsepower. Power wheelies should come easier as it cools down.

I wouldn't go looking for a problem unless you have one. If you think you do, hit the header pipes with a squirt water bottle. That will let you know if a cylinder is not firing well.

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post #9 of 15 Old 10-07-2010, 01:43 PM
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Quote:
Originally Posted by HondaJim View Post
Gauge at the little mark at the bottom is normal, especially when cooler.

Colder air makes more horsepower. Power wheelies should come easier as it cools down.

I wouldn't go looking for a problem unless you have one. If you think you do, hit the header pipes with a squirt water bottle. That will let you know if a cylinder is not firing well.
Spot on. When cold out, the bike seems to run better and like it's been scalded.

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post #10 of 15 Old 10-07-2010, 01:50 PM Thread Starter
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Quote:
Originally Posted by mcromo44 View Post
You are surely going to be wasting your time doing a compression check.
Point taken.

Quote:
Originally Posted by HondaJim View Post
Gauge at the little mark at the bottom is normal, especially when cooler.

Colder air makes more horsepower. Power wheelies should come easier as it cools down.

I wouldn't go looking for a problem unless you have one. If you think you do, hit the header pipes with a squirt water bottle. That will let you know if a cylinder is not firing well.
I always thought that cold air meant more power as well, it just seems like recently it has been the opposite. Maybe my riding style is changing, but I will continue to keep on eye on the old girl. Good idea on the squirt bottle!

Thanks for all the feedback guys!

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post #11 of 15 Old 10-07-2010, 02:06 PM
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It's October in Idaho... go get some gloves!!

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post #12 of 15 Old 10-07-2010, 03:28 PM
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Quote:
Originally Posted by OSIRIS View Post
Point taken.



I always thought that cold air meant more power as well, it just seems like recently it has been the opposite. Maybe my riding style is changing, but I will continue to keep on eye on the old girl. Good idea on the squirt bottle!

Thanks for all the feedback guys!
Yes cold air makes more power because it's density is higher and therefore a greater mass of air and correspondingly increased fuel is being combusted.
But a stone cold motor/oil/coolant does not make peak power.

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post #13 of 15 Old 10-08-2010, 12:44 PM
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Quote:
Originally Posted by OSIRIS View Post
Point taken.



I always thought that cold air meant more power as well, it just seems like recently it has been the opposite. Maybe my riding style is changing, but I will continue to keep on eye on the old girl. Good idea on the squirt bottle!

Thanks for all the feedback guys!
Another thought. It is possible that a duff sensor is also involved, be it the Intake Air Temp sensor or the Cooling System Temp system sensor.

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post #14 of 15 Old 10-13-2010, 09:07 AM Thread Starter
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Quote:
Originally Posted by mcromo44 View Post
Yes cold air makes more power because it's density is higher and therefore a greater mass of air and correspondingly increased fuel is being combusted.
But a stone cold motor/oil/coolant does not make peak power.
Power difference is after the bike is/should be fully heated... prob just in my head. (I hope)

Quote:
Originally Posted by mdtoney View Post
It's October in Idaho... go get some gloves!!
Have them, but imho.... there is nothing like feeling the wind on your hands and face... I also ride with my visor open for this same reason. I do use gloves when it drops below about 40 degrees.

Quote:
Originally Posted by mcromo44 View Post
Another thought. It is possible that a duff sensor is also involved, be it the Intake Air Temp sensor or the Cooling System Temp system sensor.
How can this be checked? I did the flapper mod? Anything related there?

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post #15 of 15 Old 10-13-2010, 10:26 AM
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Quote:
Originally Posted by OSIRIS View Post
Power difference is after the bike is/should be fully heated... prob just in my head. (I hope)



Have them, but imho.... there is nothing like feeling the wind on your hands and face... I also ride with my visor open for this same reason. I do use gloves when it drops below about 40 degrees.



How can this be checked? I did the flapper mod? Anything related there?
The factory manual has methods for checking sensors.

Unless you somehow blocked the flapper closed, the flapper mod will have nothing to do with what you are experiencing.

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