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Hi @minh-thanh Auto ignition temperature is the lowest temperature that a proper air fuel mixture MIGHT ignite, not the temp that it WILL ignite at. The speed of compression, and the high pressure within the cylinder make the auto ignition temperature difficult to predict. I think you are...

Minh-Thanh, I hope Peter doesn't mind me stepping in here, but I will do my best to present the math for the thermodynamics of air compression. First, an assumption regarding the type of compression must be made. With fast compression as in an engine, the process is normally considered to be...

I remember Mr.Hansen saying in one of his diesel videos that, even though he has been asked many times, he does not give drawings or much "detailed" information about his engines, because if he does that, people will ask more and more questions, and will want him to diagnose why their engine...

I occasionally need to refer back to the opening post of the topic to see what question the original poster asked. Lloyd

Yes, with a roots blower like Greyhound buses, diesel trucks, lots of marine and stationary engines, and of course trains with the always disastrous run-away blown diesels. Here is the build thread for the project. I have been stalled on it for a while, but now that I have the blower, head...

A few people on the forum (MT) have successfully built true diesels, but it ain't easy. Regarding fuel atomization, it can be done. I am working on a 2 stroke diesel patterned loosely after the Detroit Diesel series of engines. I finally got the unit injector (HP pump and injector combined into...

I think that sentence says a lot. You are not expecting anything good, and that's probably what will happen. Welding is an art that takes a lot of time to learn to do just an "acceptable" job. There are no short cuts "as seen on TV." First suggestions (and I do not shy away from learning very...

Wow, it must be so nice to have an active club with real activities, including testing and certification. No "test till failure", I hope, where the only witness is a video camera?

Probably spiders, too.

The crankshaft counterweights can balance much of the first order vertical (up and down) imbalance, but not the first order side to side created by the counterweights and conn rod. A single balance shaft rotating at the same speed as the crank can eliminate much of first order side to side...

Joe, yes, I realize how incredibly lucky I am. But I also know that being a dad and grandpa is a job where I need to muster up all the patience I can, LOL. And that CAN be a job. (and safety is always number 1.) Here is grand daughter at the drill press, and the other pic is of her mom (the...

Grand daughter (a young 11) was visiting yesterday. She loves being in my shop and making things and helping. She has her own cabinet and drawer for her projects and is learning safe use of tools, although she can be a bit overconfident. After she reorganized my plier drawer ;) , I had...

If I may suggest a slightly different approach to your material selection conundrum, I will give it a try. Because most of us are working on models and only need tiny amounts of specialty materials, we are often left with: 1. What can I find? 2. What can I buy? 3. What can I afford? And...

The surface finish (cylinder bore) should have a very smooth finish, almost polished if possible. Have you looked at the failed o-rings under magnification to see if the outer surface is worn or damaged? Given your stated actual dimensions of your engine, the groove depth including the piston...

It's still a bit too risky to put the pepper plants out yet with a few chilly nights still possible, but the asparagus has really started to come in. Wish I liked it, LOL.

Ouch, I didn't even see that one coming! I will have to share that one with my 10 YO grand daughter. We were actually along that creek yesterday afternoon, near the well, and she found a bunch of dried up, past their prime Daffodils. She handed them to me saying, "Here are some Dead-fo-dils for...

Darn!! Living the good life!

Welcome to the forum! Not very connected to your peers? Don't worry, there are plenty of nerds and geeks here. We understand each other. You'll get plenty of project suggestions, but it would be good to know your skill level, if you have any tools and equipment, whether you want to spend a...

A few nights ago our water quit. We are on a private well and I knew the pump was over 12 years old. I went down to the well in the dark and verified that the 230volts was getting to the well, but the pump was not pumping. A quick check with an ohm meter showed that the windings were not reading...

I had heard some anecdotal "scare" reports about Teflon, but had attributed to "partially informed," folks and didn't give it much thought. After all, almost all of the wire insulation used in the equipment we built for the USN was a hi-temp Teflon insulated. But I did hear one story from Ball...