Date: 1 Feb 2005 19:47:12 GMT From: Dave Hinz <DaveHinznospamcop.net> Subject: Re: Saab newbie
On Tue, 1 Feb 2005 20:25:13 +0100, MH <nomailnospamere.no> wrote: (someone else wrote...) > >> ... But when a gas is compressed, any gas, >> it gets colder by nature... not hotter! > > No it doesn't.... What do you think the intercooler is for? Agreed, everything would work differently if his statement was true. Compressing gas heats it. If you don't believe me, put your hand on the pipe between an air compressor and it's tank & tell me what you think. Or, feel a propane tank when it's in use and see how cold it is. > To prevent knock when the turbo comes on, the compression ratio in a > turbocharged engine is only 1:8 or so (vs. 1:10+ in a NA engine) . The > higher the MON/RON the higher the APC computer will allow the turbo pressure > to be. Right. So the base boost may be, say, 0.8 bar, but when you're using APC (or newer) the base boost isn't the upper limit, the knocking is.
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