ClioSport.net
Register a free account today to become a member!
Once signed in, you'll be able to participate on this site by adding your own topics and posts, as well as connect with other members through your own private inbox!
-
When you purchase through links on our site, we may earn an affiliate commission. Read more here.
Air intake Temp.
- Thread starter George16v
- Start date
Focus ST
Hot air is less dense so you will reduce the volumetric efficiency of your engine - i.e there will be less air per unit volume sucked in, meaning less oxygen to burn the fuel with and therefore you wil lose power
[Edited by Lucas on 10 May 2004 at 10:25am]
Just to give you an idea, air at 0 degreesC is 10% denser than air at 30 degreesC - this is why your car will feel quicker in the winter, and a bit sluggish in the summer.
The volumetric efficiency of the engine will not change!
Exactly the same volume of air is sucked in, but because of the increased heat of the air, it contains less air as you have said.
The ECU knows by the inlet temp sensor to add less fuel to ensure not too much fuel is left unburnt, and so less power is made. Some cars get affected badly by this (the 172 is pretty bad), and others seem to hardly be affected at all.
Now you all know how I feel living down here in deepest darkest HOTTEST africa...and then just to make things even better, Im at altitude (1500m above sealevel) so my poor little 172 only make 115hp @ wheels as standard
[Edited by viceroy on 10 May 2004 at 12:04pm]
Well I have taken off my cold air feed as there didnt seem to be any air getting in, But for some reason seems much better know, even without an air feed.
It is an enclosed carbon box, similar to viper kit, and I live in central london so sit in alot of traffic, is very weird
Just like Frosty said, VE will not change with temp, your ECR might change and youll have less oxygent to burn, so for the same volume = less power.
The 172 can loose over 10bhp simply by running the 80C+ engine bay temps than the 30-35 ish temps you would get if you ran air sourced from outside the car.
Ive done extensive testing on the 172 with inlet air temps and it makes a massive difference, especially to power around the peak torque RPM...
I have a Quickshift Taipan 2 kit. Same as the viper but not foam has like a K&N inside. Trouble is that it is silent and I love the roar you get from an open kit. I have taken the cold air pipe off so am getting a wicked roar at the mo. Just need to get better piping like you said, Not really sure though, am buying a ram air kit off someone for £35 so will see what thats like. I have angle the cold airpipes (2 of them) to the IK just not over the opening completely they are about 1 inch away so the cold air muct still be getting in there at speeds - I would have thought
here are the two pictures of the kit. Before the cold air piping was going through the blue hole, now the air just comes from there in the form of the two standard pipes, seems better but will need to change soon!
http://www.boltlightning.co.uk/LEMANSTRIP/images/cliobits003.jpg
http://www.boltlightning.co.uk/LEMANSTRIP/images/cliobits004.jpg
the way i figure it is howmany foglights do you really need...
http://erc.qmuc.ac.uk/cliosport/gallery/full/1084209429__IMAG00841.jpg
i know people have said it doesnt affect volumetric efficiency but surely it does. air expands as it gets hot so you will get less hot air in the same amount of space you would get a lot more cold air. isnt that what volumetric efficiency is all about-filling the cylinders with as much air as possible. you can get less warm air in the cylinders compared to the amount of cold air you can get in there.so surely warm air reduces volumetric efficiency doesnt it?
Similar threads
