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No problem, Thomas. Glad somebody thinks enough
to keep me on track. That's what's nice about this list - you can have a
"bad" day and you don't get beat up- too badly (unless Rusty is around
{:>)).
Ed
----- Original Message -----
Sent: Monday, September 05, 2005 5:05
PM
Subject: [FlyRotary] Re: Another great
flying day = another day of troubleshooting
Sorry Ed!
I answered a previous message before reading this one!
:))
Thomas J.
----- Original Message -----
Sent: Monday, September 05, 2005 3:11
PM
Subject: [FlyRotary] Re: Another great
flying day = another day of troubleshooting
You're absolutely correct. The pressure ratio has
nothing to do with MAP. I knew I should have had a second cup of
coffee this morning. Back to trying to get a graphical LCD to
work - hopefully with more success than encountered on this topic {:>)
Duh!
Ed
----- Original Message -----
Sent: Monday, September 05, 2005 2:39
PM
Subject: [FlyRotary] Re: Another
great flying day = another day of troubleshooting
Ed I am talking MAP in both cases. I don't see how 26" MAP is
higher than 36"MAP. But I learned the old math :-)
Dave
On 9/5/05, Ed
Anderson <eanderson@carolina.rr.com>
wrote:
Well, actually it is absolute pressure that the
spark plug is reacting to. In this example, the absolute pressure
in the intake is 1.234" HG higher at 10,000 with your 26 " boost than at
sea level with your 36" of boost.. This would contribute to an
increased pressure in the combustion chamber when it is compressed over
the sea level compression pressure. Therefore, the spark plug is
facing a tougher task at 10,000 than at Sea level (in this example).
Ed
----- Original Message -----
Sent: Monday, September 05, 2005
12:57 PM
Subject: [FlyRotary] Re: Another
great flying day = another day of troubleshooting
Actually, Dave you had a higher pressure ratio (manifold
to ambient) at 10,000 feet with 26" boost than at sea level with
36". At sea level the pressure ratio would be 36/29.92 =
1.20. At 10,000 ft ambient pressure = 20.57 " hg , so the
pressure ratio would be 26/20.57 =
1.26. Not much greater, but it was higher by approx.1.23"
Hg. (1.20 -1.26 = .06 *20.57 = 1.234" Hg).
Ed
A Right. But what does
the plug know about the ambient pressure? I thought that it was
just the absolute density of the charge that was contributing to SAG.
--
Dave Leonard
Turbo Rotary RV-6 N4VY
http://members.aol.com/_ht_a/rotaryroster/index.html
http://members.aol.com/_ht_a/vp4skydoc/index.html
--
Dave Leonard
Turbo Rotary RV-6 N4VY
http://members.aol.com/_ht_a/rotaryroster/index.html
http://members.aol.com/_ht_a/vp4skydoc/index.html
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