919 loves the cool weather - Wrist Twisters
 
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post #1 of 27 Old 10-14-2009, 02:39 AM Thread Starter
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919 loves the cool weather

My bike runs it's best on cool days. Doesn't do nearly as well on really hot days, or so it seems.

Wonder if there's a hot weather map for my PowCom?

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post #2 of 27 Old 10-14-2009, 04:37 AM
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Quote:
Originally Posted by Sniper View Post
My bike runs it's best on cool days. Doesn't do nearly as well on really hot days, or so it seems.

Wonder if there's a hot weather map for my PowCom?
know for sure my gas milage drops in the cooler weather

dont need a bike to ride the fast lane
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post #3 of 27 Old 10-14-2009, 04:48 AM
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It is amazing how much better everything runs with cool, dense air.

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post #4 of 27 Old 10-14-2009, 05:19 AM
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Mine likes the cold air too.

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post #5 of 27 Old 10-14-2009, 10:20 AM
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My seat of the pants says its worth about 10hp

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post #6 of 27 Old 10-14-2009, 10:35 AM
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Yuppers, my 919 is extra spiffy on cool days.

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post #7 of 27 Old 10-14-2009, 11:14 AM
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my truck runs better on a cold morning haha... its the cold dense air that makes everything run better... but is probably more pronounced on the 919 as it runs rich from the factory, so with the cool dense air the fuel mixture becomes closer to what it should be.

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post #8 of 27 Old 10-14-2009, 01:12 PM
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my cat runs faster on cold days, for the birds in the yard that is





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post #9 of 27 Old 10-14-2009, 01:14 PM
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I miss the STI as the weather gets colder Turbo's are so much more efficient when its freezing outside.

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post #10 of 27 Old 10-14-2009, 01:16 PM
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But tires take longer to warm up

More power, less control...

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post #11 of 27 Old 10-14-2009, 03:44 PM
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well not to be a buzz kill but on cooler cold days power is down along with gas milage..i say my bike feels better in warmer weather

dont need a bike to ride the fast lane
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post #12 of 27 Old 10-14-2009, 04:44 PM
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Colder air = more dense air.

Dense air is better for power.... or else why turbos and superchargers?
It is also well documented bikes produce less 'actual' hp on a dyno on hot days.
So not sure where you get the down on power...

I am guessing it is possible on a bike that is carbed... but not sure.

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post #13 of 27 Old 10-14-2009, 04:50 PM
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He might be referring to cold air causing the fuel to cool, which does increase it's surface tension, which does result in poorer gas mileage, and the possibility of less power. But once everything is warmed up and flowing, I would guess that it's nothing but more power.

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post #14 of 27 Old 10-14-2009, 05:58 PM
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Quote:
Originally Posted by MaxwellEdison View Post
He might be referring to cold air causing the fuel to cool, which does increase it's surface tension, which does result in poorer gas mileage, and the possibility of less power. But once everything is warmed up and flowing, I would guess that it's nothing but more power.
Useless information tidbit -
Spoiler:
In turbine engines the fuel is heated up because it atomizes better, even though a cold air/fuel mix is more dense than a hot one, having a more complete burn of the fuel mix is more important. Or course, when your engine is running over 500 deg F, cooling off the fuel seems like a secondary goal. Also comically high levels of compression, and several (sometimes dozens) of fuel nozzles (not injectors!) supplying fuel...

More useless slightly related info - the fuel is often (but not always) heated with a fluid to fluid inter-cooler using the engine oil to heat the fuel (and conversely, cool the oil). Some engines will even have the engine oil running through the inlet for further oil cooling as well as anti-ice on the inlet. Of course, the inlet being where everything goes in, it's a common joke when a mechanic can't find a tool for someone to yell "It's in the inlet" really loud. Needless to say, toolbox inventories are done EVERY time you open or close the toolbox, and before and after breaks. Can't have a tool lost inside a turbine engine. They don't work well like that.

I could go on (after all, it's my job) but I'll stop. I'm sure the ins and outs of turbine engines aren't all that interesting to you guys. Other than that...

Yup. Hot fuel atomizes better than cold.

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post #15 of 27 Old 10-14-2009, 07:31 PM
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Quote:
Originally Posted by WheelieTime View Post
I miss the STI as the weather gets colder Turbo's are so much more efficient when its freezing outside.
Hell yeah.

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post #16 of 27 Old 10-14-2009, 08:13 PM
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Quote:
Originally Posted by MaxwellEdison View Post
He might be referring to cold air causing the fuel to cool, which does increase it's surface tension, which does result in poorer gas mileage, and the possibility of less power. But once everything is warmed up and flowing, I would guess that it's nothing but more power.
you got it..Gas atomization motorcycle on a dyno will make more hp on a upper 60 s to mid 70 deg day..pretty well known with dyno operators ..but they sure sound different in the cold weather....that is if your running an exhaust

dont need a bike to ride the fast lane
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post #17 of 27 Old 10-14-2009, 08:22 PM
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Quote:
Originally Posted by secondchance View Post
you got it..Gas atomization motorcycle on a dyno will make more hp on a upper 60 s to mid 70 deg day..pretty well known with dyno operators ..but they sure sound different in the cold weather....that is if your running an exhaust
i have yet to see an engine without a exhaust..... or a intake for that matter....



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post #18 of 27 Old 10-15-2009, 12:26 PM
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just noticed the spineless jelly fish who keeps saying i have no clew lol loves dealing out the bad rep points...guess he hate when i state fact..keep em coming you smelly turd..you loser

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post #19 of 27 Old 10-15-2009, 01:35 PM
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Ever noticed how heavy the air feels on some days as your fighting your way through it, and other days it's not?

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post #20 of 27 Old 10-15-2009, 01:49 PM
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Quote:
Originally Posted by PHOBMAN View Post
Ever noticed how heavy the air feels on some days as your fighting your way through it, and other days it's not?
sounds strage but true yes i have

dont need a bike to ride the fast lane
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post #21 of 27 Old 10-15-2009, 02:16 PM
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Quote:
Originally Posted by PHOBMAN View Post
Ever noticed how heavy the air feels on some days as your fighting your way through it, and other days it's not?
I notice this frequently. often it's different from one hour to the next...Think it's barometric?

Well, fire the engines! Spur this iron space-pony on!

"The Shadow"
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post #22 of 27 Old 10-15-2009, 04:54 PM
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Quote:
Originally Posted by barton664 View Post
i have yet to see an engine without a exhaust..... or a intake for that matter....
Quote:
Originally Posted by secondchance View Post
just noticed the spineless jelly fish who keeps saying i have no clew lol loves dealing out the bad rep points...guess he hate when i state fact..keep em coming you smelly turd..you loser
my crack about the exhaust was a tongue in cheek joke...


and i really hope your not accusing me of cherrybombing you.... because when i cherrybomb someone i tell them why they got it and who i am.......



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post #23 of 27 Old 10-15-2009, 04:59 PM
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Quote:
Originally Posted by secondchance View Post
well not to be a buzz kill but on cooler cold days power is down along with gas milage..i say my bike feels better in warmer weather
Is that why so many people put those hot air intakes on their cars? No...... wait....... I think they might actually be cold air intakes.........

I guess they want their cars to go slower? I'm so confused!!!!!!!!!!!!!!!

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post #24 of 27 Old 10-15-2009, 06:01 PM
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Quote:
Originally Posted by barton664 View Post
my crack about the exhaust was a tongue in cheek joke...


and i really hope your not accusing me of cherrybombing you.... because when i cherrybomb someone i tell them why they got it and who i am.......
i realize its tongue and cheek....yes i know you sign yours ..thats always cool

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post #25 of 27 Old 10-16-2009, 07:37 AM
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Dry air. Cool DRY air is what makes optimum horsepower not cool DENSE air. Dense air (in the form of high humidity) actually takes up space in the cyclinder that could otherwise be put to good use with a dense fuel charge. More oxygen is what it's all about and dense air, because of humidity, doesn't hold as much oxygen as cool dry air.

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post #26 of 27 Old 10-16-2009, 08:08 AM
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We should start another oil thread.......

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post #27 of 27 Old 10-16-2009, 09:05 AM
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Quote:
Originally Posted by gpzTurbo View Post
We should start another oil thread.......
Well I'm using Red Line 10-40 pure synthetic, what are you using gpz?


PS...I should have clarified that my above post is as it pertains to natural aspiration.

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