#MT49 Part 20 - Jerry Howell V-twin IC Engine. Valve Timing. In 4K/UHD by Andrew Whale.

Making a Jerry Howell V-twin IC Engine. In this video, part 20 of the series, I configure the valve timing. The description below might help others undertaking this task.... --------------------------------------------------------------------------------- 1. Viewing engine from the rear (i.e., the ignition rotor side) 2. Engine rotating clockwise 3. Ignition rotor turning counter-clockwise (2:1 gear driven from crank tailshaft) 4. Ignition rotor fabricated as per page 39 in drawings (135 degrees between magnets) 5. Setup to fire at Top Dead Center (TDC) to make description easier 6. #1 cylinder on the left With #1 firing at TDC, #2 cylinder is half through its exhaust stroke (90 degrees of rotation due to the shared crank pin). #2 cylinder finishes the exhaust stroke and completes the intake and compression strokes (another 360 degrees) before firing on TDC. That provides a total of 450 degrees crankshaft rotation between #1 and #2 firing. The ignition/oil pump shaft reduction provides 225 degrees of ignition rotor rotation (in the opposite direction). Once #2 cylinder fires, #1 cylinder only has to do 1 1/2 strokes (270 degrees) to finish its intake and compete the compression stroke to be back at TDC for the plug to fire. --------------------------------------------------------------------------------- If you can offer me any help or advice, please leave a comment. I hope some of my videos help inspire others to venture into model engineering. If you would like to keep informed of my new videos, please subscribe. If you find my videos of value you could always help me continue making them by making a small donation at: paypal.me/AndrewWhale If you have any private questions/advice you can contact me via email at [email protected] Cheers! Backing track credits...... Music: (intro) Water Lily by the 126ers - YouTube Audio Library WARNING: Metal turning can be dangerous! I am not sure whether the methods I use are established ones, and I do not recommend them. Please do not copy me without doing your own risk assessments! You are responsible for your safety - not me!