ned
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| posted on 21/10/03 at 09:36 AM |
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Does your car's engine like cooler weather?
This is not a post directly about the weather! but I was up at 6am this morning (about an hour earlier than normal) and went to meet a man about a
gearbox (with concentric hydraulic clutch  )..
It was cold and after removing the frost/ice from the windscreen and warming up the engine it didn't half seem to pull well with the nice cold
air  maybe it was just me.
Anyone else noticed their cars (locost or other) liking the cooler oxygen dense air in the mornings/evenings?
Ned.
beware, I've got yellow skin
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MK9R
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| posted on 21/10/03 at 09:36 AM |
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My scooby loves the cold weather!
Cheers Austen
RGB car number 9
www.austengreenway.co.uk
www.automatedtechnologygroup.co.uk
www.trackace.co.uk
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David Jenkins
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| posted on 21/10/03 at 10:21 AM |
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As far as I can recall, all i.c. engines like cold air - the petrol charge can get more volume expansion than from warm air.
This is why diesels often have intercoolers between the turbo and the engine - the air gets heated in the turbo and needs to be cooled for maximum
efficiency. Or something. Or I may be talking complete drivel. Your call! 
chrs,
David
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GO
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| posted on 21/10/03 at 11:16 AM |
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All engines like cold, dense air! Prob more noticeable on engines with IC. You'll notice the difference at the top of a mountain with the thin
air sapping power.
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MK9R
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| posted on 21/10/03 at 11:17 AM |
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They must really like it if you want to tell us twice!!
Cheers Austen
RGB car number 9
www.austengreenway.co.uk
www.automatedtechnologygroup.co.uk
www.trackace.co.uk
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A Badger
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| posted on 21/10/03 at 11:34 AM |
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It's amazing the difference a few% makes to the feel of a car.
Has anyone tried Shell Optimax Super Unleaded? It's got a higher Octance rating than normal super (and helps clean all the poo out of the
engine). I use it in my Golf V5 and it gives the same sort of extra response you get on cold mornings.
PS. My doors were frozen shut this morning never mind the windscreen...
Andrew
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MK9R
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| posted on 21/10/03 at 11:44 AM |
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Always run with optimax, not sure it makes a "real" noticeable performance difference, but mentally it seems faster!!
I definetly get better mpg than standard unleaded though.
[Edited on 21/10/03 by MK9R]
[Edited on 21/10/03 by MK9R]
Cheers Austen
RGB car number 9
www.austengreenway.co.uk
www.automatedtechnologygroup.co.uk
www.trackace.co.uk
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A Badger
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| posted on 21/10/03 at 12:03 PM |
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Yeh, I get something like 5mpg better than with normal fuel. Makes up for the cost difference.
EVO mag did a test using a number of different vehicles. They did lots of performance times and then ran them on Optimax for a month. The theory being
that not only will the fuel make it better a months cleaning would help.
They had an M3 that had been run on nothing but Supermarket fuel and after a month was 1 second quicker to 60!!
Andrew
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aus-sambo
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 posted on 21/10/03 at 12:06 PM |
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thermal difference
one of the few things i learnt during my mech-engineering degree is that the amount of power a motor makes is determined by the temperature difference
of gases before/after combustion. so there you go, that's why mr diesel invented the intercooler.
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locoboy
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| posted on 23/10/03 at 03:43 PM |
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Isnt the air cooled so you can squeeze more air/fule mixture in the cylinder especially with a turbo because cold air takes up less volume than warm
air?
ATB
Locoboy
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ned
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| posted on 23/10/03 at 03:45 PM |
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cold air is higher/more dense in oxygen, hence burns better.
Ned.
beware, I've got yellow skin
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GO
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| posted on 23/10/03 at 03:52 PM |
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cold air is just denser, doesnt affect O2 % but does mean that you'll have more air, and therefore more O2 in your cylinders, and therefore more
go go juice as well - hence more POWER!!!!
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Mark Allanson
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| posted on 23/10/03 at 09:06 PM |
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I have read that if you fill your tank on a frosty morning, you get 5% extra fuel due to the petrol being cooler and therefore more dense
If you can keep you head, whilst all others around you are losing theirs, you are not fully aware of the situation
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stephen_gusterson
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| posted on 24/10/03 at 10:56 PM |
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hi and welcome!
please use some of your degree experience to downsize yer avatar pikkie!
atb
steve
quote:
Originally posted by aus-sambo
one of the few things i learnt during my mech-engineering degree is that the amount of power a motor makes is determined by the temperature difference
of gases before/after combustion. so there you go, that's why mr diesel invented the intercooler.
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Peteff
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| posted on 8/11/03 at 12:18 PM |
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Does your car's engine like cooler weather?
Probably, but its driver doesn't. They do run better on moisture laden air in the morning when the engine has warmed up.
yours, Pete.
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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