Electronic Valve Internal Combustion - 2 cylinder 1" bore 1"stroke
4 Stroke Cycle I.C. Engines with Electronically Activated Valves.
The EVIC - 211 Twin Engine as it appeared in September 2003.
The EVIC - 221 Twin is on the cover of the March / April 2005 issue of Home Shop Machinist magazine. The coming issues will contain a complete construction article including the electronics schematics. I will be offering a complete electronics package for the engine. For those who wish to build there own electronics I will supply a set of 6 programmed micros. The source code is available for those who wish to program their own PIC micros or to try modifications to the software controls. Click here to learn about the electronics.
Design of the EVIC - 211 Twin started in September 2002. The Twin is a 25cc engine with an all aluminum crankcase. My plan from the outset was to put this engine into my radio controlled model boat to demonstrate that this engine could develop useful power. It incorporates all the design improvements from the Mk2 single.
The Twin first ran in March of 2003. I have run the engine without a load to 13,000 RPM. The ganged exhaust valve solenoids and all the software improvements from the Mk2 development program have been incorporated into the Twin.
During 2004 this engine used my Mk4 electronics plus an additional solenoid driver board to control the 3 solenoids for the second cylinder. The additional board had a PIC12C508A to provide electrical damping for the solenoids for the 2nd cylinder. To keep the software simple I added another PIC12C508A micro to control the spark timing. That made 4 micros in all.
During the summer of 2004 the EVIC Twin powered my 52" Deep V model boat. Based on data recorded by a Garmin Geko 101 GPS receiver and my digital tach the boat has reached a top speed of 38.4 Km/Hr (24 MPH) while turning an Octura X665 prop at 10,600 rpm.
In the fall of 2004 I switched to the new Mk5 electronics. The Mk5 electronics have a micro for each valve. This improves the control and makes the electrical damping on valve close more effective. The Mk5 electronics package has 6 micros, a 16F628A main processor, a PIC12F629 processor for each valve and a PIC12F629 to control the spark advance.
The engine appeared on the front cover of the March/April 2005 issue of Home Shop Machinist. The magazine is running a complete construction series for those who want to build the engine. The last part is expected to appear in the March/April 2006 issue.
During the summer of 2005 I ran my EVIC Twin many, many times in my R/C boat. The boat reached a top speed of 42 Km/Hr (26.25 MPH) while turning the Octura X665 prop at over 11,000 rpm. My Twin performed all summer long without any problems - 100% reliability!
Last update - November 21, 2005.