From: "Marvin Kaye" <marv@lancaironline.net>
Subject: Re: [LML] Re: To supercharge or not to supercharge
To: lml
Date: Wed, 15 Oct 2003 01:32:09 -0400
Message-ID: <web-2637278@logan.com>
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Posted for George Braly <gwbraly@gami.com>:


Well... let me interject a bit of reality to this.

30" of MAP on an 8.5:1 compression engine is NOT  "just loafing along".  

The ROP, the peak internal cylinder pressures are rather high, unless the
fuel flow is up at 33 gph or so.

70F LOP,  30"  with 8.5:1 and reasonable timing (22d comes to mind) is very
nice in terms of the internal cylinder pressures.

Even 31, or 32, or 33" while LOP with 8.5:1 and 22d timing is OK - - but not
ROP unless the mixture is VERY VERY ROP.

If the engines were 7.5:1 compression ratios,  then you can add about 3" to
the above, but it is not correct to assert that these engines are just
"loafing" along at 30" when they have 8.5:1 compression ratios.   At least,
if medium to long term durability is an issue.  

Regards,  George Braly


>>>  30" of MAP for a Supercharged engine is just loafing along but we will
test
that parameter also.<<<<