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First time inputting on this list,
but this string is right up my alley. Getting ready to start on a Velocity
with rotary power. In 1982, I took my RX-7 to SoCal, and had a turbo
installed. They put in a variable boost waste gate, and water injection,
because they weren't making intercoolers at the time, and detonation was an
issue. The water injection was very simple. As stated below, they
used a windshield washer tank (about 2 quarts), wired to a vacuum switch in the
intake manifold, and a light hose to the air filter, (Carter Series-C 4-barrel),
to a brass fitting with a small hole drilled in it. This shot directly
into the venturies. How they calculated the hole size I don't know, but
the water would last for a full tank of gas, with some hard driving. At
sea level, boost was minimal, and had to be watched carefully. At
altitude, in the Sierras, (Donner at 7,000 ft. Sherwin at 11,000?), I would
boost it higher, and the results were amazing, and I put 30,000 miles on this
before I sold it, with no problems. Exhaust heat was a problem, but a few
wisely place reflectors solved that problem.
Greg Ward
----- Original Message -----
Sent: Monday, December 10, 2007 10:40
AM
Subject: [FlyRotary] Re: Methods of
charge cooling was Water/Meth injection
Thanks, Bill and Ed,
I found it amazing what the Subaru dudes are doing with their street
engines! What is curious is the fact that common windshield washer fluid was
used for injection and the injection systems actually used the windshield
washer tank as the reservoir. They say they can get up to 4 tanks of gas to
one gallon of water/meth.
I brought up the idea for the Rotary because of the hot exhaust problems
and for the fact that the apex seals cannot stand detonation. This can be a
good solution if progressive injection programming is used. The EFI program
needs to be adjusted to reduce fuel as water/meth is added. The injection can
be programmed to limit use by rpm or boost level.
Regards,
Ben
----- Original Message -----
Sent: 12/06/2007 7:40 AM
Subject: [FlyRotary] Re: Methods of
charge cooling was Water/Meth injection
Ben,
Jack Morrison, at Aurora Airport is
running methanol-water injection in a supercharged IO-540 in an E-racer. It
lowered his cylinder head and EGT temperatures.
Bill Schertz
KIS Cruiser #4045
N343BS (reserved)
----- Original Message -----
Sent: Tuesday, December 04, 2007 7:01
PM
Subject: [FlyRotary] Methods of
charge cooling was Water/Meth injection
Ben, here is a URL that gives a
number of different ways to cool the intake charge. You may find it
interesting
Ed
----- Original Message -----
Sent: Tuesday, December 04, 2007
3:00 PM
Subject: [FlyRotary] Water/Meth
injection
I have moved away from the Rotary (shame on me) and toward the
Subaru. I have been researching how to get more torque and found the
only way is with boost. The street Subaru guys are injecting water and
methanol to avoid detonation under high boost--getting 450 hp from 2.5
liters. The methanol and water cool the charge while the methanol
also increases the octane. This allows them to run 89 or 91 octane
fuel under low boost w/o injection and have high octane-high boost with
injection. The injection is set to start at a certain boost pressure or
rpm level.
I am going to go this route in my aerobatic biplane so I can run on
cheap fuel in econo cruise and still not detonate while doing full
throttle aerobatics.
One of the side benefits of this injection is lower EGTs--as much
as 400 degrees. Has anyone done any testing with water injection to
lower EGTs?
Another benefit is much cleaner combustion chambers. That
sounds useful to me, too.
Ben
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