>   Does anybody know what units are in for air density in this
    >formula
    >   if V is in feet per second. I'll settle for the metric units.
    >
    >   I think it is in pounds per cubic inch which
    >   is .000046676 under standard conditions.
    >
    >   Paul Lamar ...No rotor no motor.
    >
    >   Paul,
    >The small p is density (rho). p = P/RT
    >Matt
    >
    >Yes but what are the units? Pounds per cubic inch? Pounds per cubic
    >foot?
    >etc. etc.
    >
    >I suspect it is pounds per cubic inch if V is in feet per second.
    >
    >Here is what I get if it is in pounds per cubic inch and V is in
    >feet
    >per second.
    >-
    >
    >I added inches of water. If this is correct it illustrates why you
    >need a choke or primers and idle circuits in carbs. The venturi
    >pressure is not low enough to suck much fuel at low RPM.
    >Carbs and venturis are a major trade off with high power
    >requirements.
    >-- Paul Lamar ...No rotor no motor.
    >
    >Paul,
    >You have discovered the reason for the secondary venturi in the
    >Weber.
    >The smaller secondary venturi provides low enough pressure at idle
    >and
    >low throttle openings for the system to draw fuel. Think of it as a
    >carb
    >within a carb. The emulsion tubes have varying height holes to
    >change
    >where the systems change over from one system to the other. They are
    >the
    >control for transition.
    >Bill Jepson
    >
    >Yes and I am surprised that somebody has not come up with a
    >mechanical solution
    >that supplies fuel directly as a function of MAP. EFI can do it.
    >I think I got it. Hang on. REAL simple. Way simpler than a Webber.
    >
    >Paul Lamar ...No rotor no motor.
    >

Is the Renesis engine a good viable engine for an RV-4?   What is it's
actual horse power?  What are the downsides?

Gene Sandburg


The HP depends mostly on the intake system used and the reduction ratio
of the gear box. Bad intake system 150 HP. Good intake p-port system 240 HP at 7500 RPM,.
One of the downsides is if you every flood it it is REAL hard to start.
Another is it does not lend itself to turbo charging.

In the future we will have no other choice as 2nd and 3rd gen RX7 engine parts
are starting to dry up and get costly.

Paul Lamar ...No rotor no motor.

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