[ma-serca] Failed Emissions Follow Up (long)
Jon Pennington
cowboydren@b15sentra.net
Sat, 6 Apr 2002 01:21:27 -0600
On Fri, Apr 05, 2002 at 07:52:40AM -0600, Gene Kwon wrote:
> BTW, retarding the ignition means it is sparking sooner... thus
> giving the cylinder more time to burn? Was that your plan?
Okay, why doesn't this sound right? Going by the oversimplified
suck-squish-bang-blow, timing advance is still just that; advance of TDC
(BTDC). Setting your timing to 15* means that the plug fires when the
#1 crank lobe is 15* BEFORE top dead center. Setting it to 13* BTDC
means that it has two degrees *less* to burn.
By this logic (which is probably flawed), we give the cylinder lots of
tome to burn to make power (19* BTDC) and less time to be clean (13*
BTDC). Am I wrong? Can you prove me wrong with math? Am I being
totally ignorant of how distributors work?
--
-=|JP|=- Need a good geek? I'm unemployed!
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