Omega Owners Forum
Chat Area => General Discussion Area => Topic started by: TheBoy on 14 February 2008, 12:46:10
-
Driving back from Nottingahm in very misty weather, the thing was flying. It loved the cool, damp air so much, I gave up trying to stick to speed limits ::)
-
mine has moments when it is really flying along.......
it's normally when the knock sensor is working >:(, and god it feels fast :y
-
Cool air is noticeably better due to the increase in density, hence more oxygen ingested into the engine and hence higher volume of fuel that can be burnt giving more power.
That's why it's vital not to be breathing under bonnet heat.
Not sure about humidity. Water vapour is fairly inert during combustion and adding anything inert to the air actually reduces power because it reduces the proportion of oxygen in the mix. It does act as an octane booster to a certain extent though. :-/
Kevin
-
Driving back from Nottingahm in very misty weather, the thing was flying. It loved the cool, damp air so much, I gave up trying to stick to speed limits ::)
It probably felt fast after driving the whiezal for so long ;)
-
Driving back from Nottingahm in very misty weather, the thing was flying. It loved the cool, damp air so much, I gave up trying to stick to speed limits ::)
It probably felt fast after driving the whiezal for so long ;)
It is quick. It was very quick up the A46 (I had a lot of time to make up) until I stood it on its nose due to a long trail of stationary traffic >:(
-
It is quick.
It is the way you drive :o ::)
-
It is quick.
It is the way you drive :o ::)
I thought it had been holding back a bit lately, but full power was returned last night :y
-
It is quick.
It is the way you drive :o ::)
I thought it had been holding back a bit lately, but full power was returned last night :y
Hmmmm valentines day and you have been driving the tractor not the MV6...
Maybe its just the MV6`s way of saying pick mepick me - im a real go - er :D
-
It is quick.
It is the way you drive :o ::)
I thought it had been holding back a bit lately, but full power was returned last night :y
Actually mine seemed like it wanted to shift this morning :-/
Unfortunately I didn't ::)
-
Ive loaned my Silver MV6 (project EP4) to my old man after changing the front wheel bearings on Tuesday and he called me when he got home to say it drives lovely. I wonder what the chances are of me getting it back ::)
-
Ive loaned my Silver MV6 (project EP4) to my old man after changing the front wheel bearings on Tuesday and he called me when he got home to say it drives lovely. I wonder what the chances are of me getting it back ::)
Every chance. Once the petrol light's flashing. ;D
Kevin
-
Driving back from Nottingahm in very misty weather, the thing was flying. It loved the cool, damp air so much, I gave up trying to stick to speed limits ::)
hmmmm.......nothing new there then!! ::) ::) ::)
-
Ive loaned my Silver MV6 (project EP4) to my old man after changing the front wheel bearings on Tuesday and he called me when he got home to say it drives lovely. I wonder what the chances are of me getting it back ::)
Every chance. Once the petrol light's flashing. ;D
Kevin
That won't be long then ::)
-
Ive loaned my Silver MV6 (project EP4) to my old man after changing the front wheel bearings on Tuesday and he called me when he got home to say it drives lovely. I wonder what the chances are of me getting it back ::)
Not sure you will get your MV6 back, but maybe an Isuzu Trooper ;D
-
Cool air is noticeably better due to the increase in density, hence more oxygen ingested into the engine and hence higher volume of fuel that can be burnt giving more power.
That's why it's vital not to be breathing under bonnet heat.
Not sure about humidity. Water vapour is fairly inert during combustion and adding anything inert to the air actually reduces power because it reduces the proportion of oxygen in the mix. It does act as an octane booster to a certain extent though. :-/
Kevin
I always thought that damp air was better due to the water molecules expanding when the mixture ignites? And thus a bigger bang?
-
I always thought that damp air was better due to the water molecules expanding when the mixture ignites? And thus a bigger bang?
I would imagine there are beneficial effects, but, at the end of the day, the simplistic view is that, if you've got less oxygen going in (because the air is "diluted" with water vapour) there is less potential to burn fuel and therefore less power.
Water injection is used in some forced induction engines to keep the burning charge cool. It vapourises during the combustion process and takes heat out of the mixture, but also drops power a little. It does enable you to run more boost without blowing up the engine though.
Most of the references I've seen talk about aircraft piston engines and the need to derate them at higher humidity levels. We're only talking about 4% power loss at 100% RH relative to 0% RH so barely worth worrying about. If it was more of an issue more cars would sense the humidity of the intake charge and adjust fuelling and ignition as they do in response to intake air temperature changes.
Kevin
-
Driving back from Nottingahm in very misty weather, the thing was flying. It loved the cool, damp air so much, I gave up trying to stick to speed limits ::)
[/highlight][/highlight]i cant imagine even you having the nuts to say that to a traffic cop when hes just pulled you over ;)
-
Cool/cold air is denser as stated, so more fuel is added to give the same fuel/air mix, more fuel = more power.
The damp side of this is a shade more esoteric .. this is part of the theory .. (comes from aircraft piston engine theory that I did some 38 years ago ......) The water vapor in the air should cool down and slow the combustion process. The knock sensor, due to the slower burning mixture, will advance the timing, creating more power.
So cold/damp air leads to more fuel and advanced ignition ... and more power.
HTH