sv and cooler weather
 

Today was quite fresh over here 7/8c. The past few weeks (months lol) have been a bit crap but quite warm ie 15+c. This morning and this evening the bike felt much smoother. Noticed it almost immediately this morning, especially in the lower 2-6k rev range. Why is this and can it help diagnose anything about how my sv is running? :)

Re: sv and cooler weather
 

im no expert and im probly totally wrong but cold air is alot denser (more oxygen) than warmer air so will burn better, dont know whether this would be noticable tho

i only know this as my old car made more power in winter than it did in summer according to dyno graphs

Re: sv and cooler weather
 

Starks is right, Cold air is more dense than warm air which means there is more oxygen getting into the cylinder during combustion.
I'm not sure it can tell you much about the way your bike will be running. If it is a carb model it may well be your bike maybe be running a little lean? (I have a pointy so am not sure.) There will probably be a more knowledgeable person along to correct me though!

Re: sv and cooler weather
 

all vehicles run better with colder denser air...to a certain degree..hence why f1 cars suffer in another cars hot turbulance, i quite like this time of year cold days/nights and long runs:D

Re: sv and cooler weather
 

Didn't really notice much extra poke tbh, as was just city commuting but the bike was noticeably smoother down low. Would this indicate anything fuel/air mix wise?

Re: sv and cooler weather
 

My SV felt especially punchy tonight. The dryer atmosphere, courtesy of the windy weekend blowing away all the moisture in the air, has helped loads with starting (fires up imediatly) and with general running.

And the cold air keeps the engine cooler and feeds it with gases richer in oxygen, mmmmmmmmm tasty

Re: sv and cooler weather
 

I have placed a post on UKww to get a weather expert view on this to see if they can shed any light on the subject:

http://www.ukweatherworld.co.uk/foru...osts=1&start=1

Re: sv and cooler weather
 

well, a good number of interesting posts from the weather peeps, and a 10% increase in oxygen at a 30 degree drop equals about 3% increase assuming normal pressure so at a -9 drop is about 3%, so engine gurus is 3% increase in oxygen a large amount compared to mechanics like inter coolers etc and does that amount make a massive difference?

Re: sv and cooler weather
 

You running rich?

Re: sv and cooler weather
 

In hot weather a highly tuned engine loses power, also they worry about cooling. Obviously you can transfer more heat to air at 10 degrees than air at 40 given the same coolant temps.

The "dirty" air is the car in fronts turbulent wake which restricts airflow through radiators and cooling ducts.