Opinions wanted ( analysis of the effects of spark advance va riation on vacuum)

[cmillard at crutchfield.com]

Ron, I limited to 900 RPm +/- 50 RPM, so 850 - 950 rpm.
Sparks were sorted (as they vary too) and sparks with low data counts were
dropped. 
-Christian

RPM is more solid as vacuum increases (lower map) 
Taming a cam with 219/228 duration and 112 LSA at idle is fun indeed.


-----Original Message-----
From: Ron Schroeder [mailto:rjs at bnl.gov] 
Sent: Friday, September 21, 2001 11:35 AM
To: gmecm at diy-efi.org
Subject: Re: Opinions wanted ( analysis of the effects of spark advance
variation on vacuum)


At 10:04 AM 9/21/01 -0400, you wrote:
<snip>
>My theory was based on for the same given RPM (900 rpm) the spark 
>advance which yielded the highest vacuum would give the best fuel 
>economy.<snip>

How constant was the idle rpm held?  Small changes in idle speed can give
signifficant vac. changes.

Ron Schroeder
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.diy-efi.org/pipermail/gmecm/attachments/20010921/a8935414/attachment.html>