Effect of Cold Weather - Saab NG900 & OG9-3 Bulletin Board - Saabnet.com
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Effect of Cold Weather
Posted by Bill D (more from Bill D) on Fri, 2 Feb 2001 16:44:53
In Reply to: Re: 97'900SET What Highway MPG should I be Geeting??, Trevor, Fri, 2 Feb 2001 14:57:33
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Cold weather can have two effects - one direct and one indirect. The indirect one is that gasoline is made differently in summer versus winter. With recent EPA regulations, the impact for cold weather is bad as more oxygenate (MTBE or ethanol) is required in many regions to reduce smog/emissions. This change in gasoline composition usually means reduced mpg (as components have less specific energy). Other (direct) effect is that there is a optimum ambient temperature range for a 4 stroke and it is usually above freezing (& below 100F). Get too hot and you lose efficiency (check the thermodynamics of the Otto cycle). Get too cold and also lose. One effect is fuel is colder and has to be heated more to its ignition temperature. I doubt this is big effect and probably offset by increased density of colder air (more air per cubic foot through intake). But my recall is that low temperatures do affect performance.
Posts in this Thread:
- 97'900SET What Highway MPG should I be Geeting??, Robert, Fri, 2 Feb 2001 08:53:03
- Re: 97'900SET What Highway MPG should I be Geeting??, Jim Pompilio, Sat, 3 Feb 2001 10:37:19
- Depends, TG, Fri, 2 Feb 2001 15:15:53
- Re: 97'900SET What Highway MPG should I be Geeting??, MJP, Fri, 2 Feb 2001 14:16:56
- Re: 97'900SET What Highway MPG should I be Geeting??, Lon Sherer, Fri, 2 Feb 2001 12:41:03
- Re: 97'900SET What Highway MPG should I be Geeting??, fsik, Fri, 2 Feb 2001 09:27:47
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