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Four cylinder automobile engines are timed 1-3-4-2. There must have been some logic behind this. Rotary engines has sequential firing order.
Lycoming and Continental 4 cylinder aero engines are 1342.
I'll admit it now, I'm going to cheat. My Bobcat and Lynx took ages to get running. When Brian did his flat twin, based on Malcolms design, he got it going just about his first try. I put it down to him using O rings. I'm convinced the compression on my engines has improved just by them sitting on the shelf. I believe the, once new, rings have normalised over time improving their fit. So, I'm going to try 1x20 metric O rings as they will go straight into the ring grooves. I can then always go back to rings, I have them already.Pete
Four cylinder automobile engines are timed 1-3-4-2. There must have been some logic behind this.
Quote from: doubletop on August 04, 2019, 09:50:39 AMI'll admit it now, I'm going to cheat. My Bobcat and Lynx took ages to get running. When Brian did his flat twin, based on Malcolms design, he got it going just about his first try. I put it down to him using O rings. I'm convinced the compression on my engines has improved just by them sitting on the shelf. I believe the, once new, rings have normalised over time improving their fit. So, I'm going to try 1x20 metric O rings as they will go straight into the ring grooves. I can then always go back to rings, I have them already.PeteI know O rings are commonly used on the pistons of steam engines but are not that common in i/c engines. Which O ring materials and hardness works best? Do you use nitrile or viton or PTFE O rings or something else? What works best? What does the team think?Mike
Hi Mike,my Hoglet engine is running with Viton O-rings, one at each cylinder, since the first fire up. I could not believe that it will work, but so far without any issues.
The last couple of IC engines that I have made were both fitted with single Vitron rings. Though both are relatively slow runners.