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Ben,
Are you planning to turbocharge or supercharge? Most turbos aren't rated for acrobatics. Many use straight methanol rather than water/meth. The charge density suffers when putting other substances in the engine, So most only use the water/meth injection to prevent detonation, not to lower temps.
Bill Jepson
al Message-----
From: Ben Baltrusaitis <expressben@verizon.net>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Tue, 4 Dec 2007 12:00 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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