- Local time
- 8:51 PM
- Jul 23, 2020
- Alamogordo, NM, USA
Just 5 years after the Wrights' first flight, Orville Wright was in the first fatal airplane crash, which left him severely injured and his passenger dead.That being said I'd rather fly the wright brother's original airplane than ever trust one of these china girls on an ultralight.
You get the same with engines sold/used as ultralight engines as there is no requirement for any form of control and literally anything can, and does get used. We are not talking about Cessna 182's here. Even the nicer purpose built UL engines have just as many issues as the china dolls. Ask me how I know..... an engine out, and a pull start failure mid air preventing restart on a PPG is not fun.Wasn't disputing the operating principles. Like I said the quality control and port timing etc is sloppy from engine to engine. You'll never get a perfect engine. There have been guys on here and youtube chasing it for years. If that's what you're trying to do good luck to you sir.
From what I've seen, most scooters / snowmobiles / RC engines are actually much better quality than these china girls.
There's a big difference. Take a look at the Phantom 85 thread ALONE to see the major differences from jug to jug. I have experience with sled motors and there is absolutely no comparison in quality.
With these , you get what you get. Try and make it as best you can. But at the end of the day it all depends on what the s**tty mold made and what the 13 yr old chinese kid decided to make.
I work in the automotive industry and the tolerances / QC on these engines are basically make it and forget it. But most of them work. That's why you get so many random people here complaining about their engines failing or doing whatever.
I fly once a week at Wilbur Wrights birthplace. There is a museum there with the only certified flying Wright Flyer left.Just 5 years after the Wrights' first flight, Orville Wright was in the first fatal airplane crash, which left him severely injured and his passenger dead.
Back in the 80s, I was taught, and learned how to co-pilot and navigate with air charts on Cessna 150s, 152s, 172s as well as Piper Tomahawks.I fly once a week at Wilbur Wrights birthplace.
The type of flying I do, PPG, or ultralight in general is definitely not a speed thrill. A bike with a china doll is generally capable of about twice what cruising speed on a PPG or ultralight is.Back in the 80s, I was taught, and learned how to co-pilot and navigate with air charts on Cessna 150s, 152s, 172s as well as Piper Tomahawks.
I do not fly anymore in anything if I can help it, never did get over my fear of flying...lol...I'm even a "basket case" anytime I had to fly commercial passenger jets...lol.
I will get my speed thrills with two wheels on the ground, thank you very much...lol.
All my china dolls have been surprisingly reliable. I hate to say it, but more reliable than some of the ultrlight engines I have had, and that many of my flying buddies fly on regularly.That being said I'd rather fly the wright brother's original airplane than ever trust one of these china girls on an ultralight.
Check the squish depth anyway, .7-.8mm. Once the engine is broken in, and you use less oil in your fuel the wash pattern will improve. Did you try wiping the oil off the piston, if it comes out clean with a quick wipe, then that's a fresh engine.No, not all the way at TDC in the pic. The piston is pretty much flush to the jug deck at TDC.
I understand the transfer wash is correct, and thats what you want.... toward the intake. What seems a bit odd is the streak straight from the intake to the exhaust with not much else in the way to the sides of that which I typically see. I understand there isnt a lot of time on it to let it really build up to tell also.
I am used to seeing a nice "mothman of point pleasant" pattern on the 2 stroke ultralight aircraft engines I am used to.
Was more curious if this is typical of the porting on these engines to create the "tongue" pattern, which I understand is not ideal.
It is at .8mm. Made sure to hit the .7-.8mm squish when I decked the jug and reworked the 47mm head squish to match the 49mm bore.Check the squish depth anyway, .7-.8mm. Once the engine is broken in, and you use less oil in your fuel the wash pattern will improve. Did you try wiping the oil off the piston, if it comes out clean with a quick wipe, then that's a fresh engine.