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Bill, the R-26B engine used the a-N method to measure
intake air amount using throttle opening and engine speed as
parameters.
Ed
----- Original Message -----
Sent: Monday, May 14, 2007 3:51 AM
Subject: [FlyRotary] Re: EC2 smoke
question
In a message dated 5/12/2007 12:43:50 PM Pacific Standard Time, Lehanover@aol.com writes:
Perhaps a .020" hole in both ends of the gage line. You have it sitting
on a resonant at idle and the gage will go away after just a bit. Like
putting a fuel pressure gage too close to the outlet of a sliding vane fuel
pump. It just shakes to pieces.
With the good breathing required for good power, there will be no
manifold pressure (vacuum) until the RPM is close to cruise, And then only
if cruise is at a bit less than wide open throttle. Maybe the air filter
will provide enough drag to get a reading. In fuel injected systems, the
lack of a choke, or venturi just adds to the problem.
Lynn E. Hanover
The solution Lynn is the hot wire mass flow sensor. I'm not
sure if Tracy could incorporate one in place of the map sensor. The circuitry
may be more complicated. There are comercial versions available fro use with
many of the throttle bodies. A single P-port inlet tube without an air box
poses a real problem. Some of the older mechanical systems are easier to work
with on single tube openings. Many of the bikes used an alpha-n system
measuring only throttle opening RPM and had a sensor for speed, usually at the
rear sprocket. The needed injector map was VERY complex and hard to modify.
True mass flow would be better. I wonder what the LeMans 26B used?
Bill Jepson
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