Homemade Radial Engine part 5

[@Fix_It_Again_Tony]

This is KZbin at its finest. Thank you for documenting to progress you have made.

[@Desmouffe]

You will get both ups and downs but that's life..

[@GICK117]

I really enjoy watching as you cut new parts on your mill. I hope at some point you decide against using music to pass time. Other than that, I am subscribed for the long haul.

[@Desmouffe]

My lathe is old and worn and make a lot of disturbing noises so that's why....

[@GICK117]

@@Desmouffe Understood. You still do a great job with it as such.

[@aSpyIntheHaus]

Thank you so much mate! :D Great video and I look forward to more.

[@shawnmrfixitlee6478]

Looking great , can't wait to hear it run again ! enjoyed ..

[@Desmouffe]

I'm getting there....

[@50piro50]

Great job! Do you know how works lubrication in vertical radial engines? Maybe do you have some document/pictures?

[@Desmouffe]

That is why I made it lying down. I could not solve the lubrication in an easy way. And if you have an engine lying down, why not put it on a lawnmower. I don't know how they solve the lubrication on a radial standing up, but I guess it must be a separate oil tank and longer cylinder-sleeves to prevent the lower cylinders to drown in oil and to get it back in the tank.

[@dennisyoung4631]

The usual is a dry-sump system, with one pressure pump and several scavenge pumps. There also need to be a system of oil scrapers, baffles, etc. to catch the oil splashing around inside while the engine thrashes around in the air during flight. This is often a matter of intensive experimentation. Oh, and oil pooling in the lower portions of the engine *IS* a big issue when it’s not running, so much so that it’s common to pull the (radial) engine through by hand several revolutions prior to starting to ensure the combustion chambers are not filled with oil or something else of an incompressible nature. Not doing so can cause “hydro-locking” - and that damages, or even destroys, engines.

[@quickturn66]

Wondering why the connecting rods aren’t 72 degrees apart

[@Thankz4sharing]

kzbin.info/www/bejne/gZjag4CAqNd2fZo

[@YangGuici]

nice engine. I have a question, when you modified the new master rod design, how did you solve the different strokes for each cylinder? Different strokes mean big differences in compression ratio. thanks

[@Desmouffe]

Now I don't have different strokes. But I had before. Earlier I had different strokes and the pistons didn't hit TDC when they should. And when they did the crankpin, pivotpoint on masterrod and pistonpin was not in a line. Therefor when the pistons ( 2,3,4 and 5) hit TDC they didn't go all the way with following bad compression. ( mostly 2 and 5)

[@YangGuici]

@@Desmouffe thank you sir, but please check it again, when you use the new 3 point inline rod design, you will find the TDC are perfect for all cylinders, but the BDC has some difference. because I did the same as yours, a radial engine, and I also use this 3 point inline design, but I found this issue about BDC.

[@Desmouffe]

@@YangGuici I never thought of that. How could I forget. Must check on the computer. Thank you, but I dont think I will rebuild it one more time. I will get back to you.

[@YangGuici]

​@@Desmouffe is no way to make all cylinders have same timing same TDC and same BDC, they are never work at same condition. normally need balance those parameters.

[@Desmouffe]

@@YangGuici You were so right. I did succeed in getting all cylinders hit TDC in right time but BDC differs 8 - 12 degrees but that is of less importance. My calculated dispacement of each cylinder is 145,9 cc. But cyl 2 and 5 has now 154,8 cc, 3 and 4 slightly less. Since I have a very low compression ratio it does not cause any problems I think. These radial engines never stop to facinate . I love them.

[@oikkuoek]

I believe this was a the same episode as the last one.. Why no lubrication drains on the slave rods? They all have the same pockets as the master rod, but only the master rod has a drain in it. I'd assume they all need similar lubrication.

[@Desmouffe]

Yes, I found out that the ending of the video was a bit strange so the only way to fix it was to remove the video and upload it again. Always check everything before upload, I know. A new episode comes tomorrow. The problem I had was the master rod so that's the aswer. I don't even know if it works. The slave rods get's sprayed from the nozzle ( I hope ) .

[@oikkuoek]

@@Desmouffe Slide bearings do need some kind of pressurised oil to create the boundary layer between the two metals. For best results it needs to travel up the crank to the master pin and then spread out to the slave pins. How to actually machine all this, I don't know. I wish you luck with this! Very interesting project.

[@Desmouffe]

@@oikkuoek This engine is very much inspiered from B&S lawnmowers and they use no oilpump. Instead they have a small wheel that trows up oil on the crankshaft. The conrod is made in aluminium only, no bronze bushings, and this is possible because they only take out about 20hp/1000cc. A normal car engine have maybe 70hp/1000cc. My engine is made after B&S specifications and I have put bronze bushings all over. If I wanted oil-pressure-lubrication this should have been done before the assembly of the crankshaft and also requires a different type of oilpump. I have an impeller-pump that gives a good flow but not very much pressure. But hey, I'm an amateur. I could be wrong. In the end the truth will bite you in the face, but that is what makes it fun...

[@oikkuoek]

@@Desmouffe Will it run? Most likely. Will it run longer than the first version? Most likely. How long will it run? Only time will tell. Just keep documenting the process, and we will all learn.

[@jimciancio9005]

Amazing talent and master machinist you are Sir. You have impressed me with your crazy builds using lawnmower basic parts and principles. You have answered many questions of curiosities for me, by doing some things I have also thought about trying but never got around to doing?! SMFH hey, even when you get everything right and measurements perfect there's still things that are outside the world of the machinist and enters into the world of engineering and lots of Research and Development has already been put into these things like radial engines. Especially when you get into anything that has multiple cylinders or wheels, crank pins can't be on perfect measured points that make sense on paper!? But in reality like a Steam Train with multiple drive wheels you can't set up the wheels in a 90° phasing. If you try they'll going to bind up on you! They must be quartered a quarter turn off from each other in order to run smoothly without binding. 90° makes sense on paper. As ones going forward and the other side is coming backwards on their connecting rods 90° is way too far apart and doesn't allow smooth transitions between all the wheel phases. But radial engines are some of the most complex things ever developed. Especially when they were building these engines with the interrupter gearing to figure out how not to shoot your own props off these engines by your own bullets! You need to know how fast that bullets reaction time is from point of detonation to traveling down it's barrel and exiting it, plus it's flight time before the prop all needs precise attention to microseconds of pinpoint accuracy! Otherwise it was yourself who you shot out of the skies! And not the enemy! The fact that they were actually able to time this to work without a computer back in the 19teens and prefect it during WWl is amazing stuff! It wasn't always full proof? But when it worked, it did what it was engineered to do! And timed the bullets flight path inbetween the blades of the prop hundreds of times a minute with a fully automatic weapon and sometimes even multiple guns were timed to fire by interruptor setups. At least you didn't go with a French designed radial engine? Those rotating engines are crazy stupid! The ones where the crankshaft stays stationary and the entire engine spins! Have a hard time imagining how the lubrication system works on something that is constantly slinging all oil outwards to the valve covers and trapping the oil there under centrifugal force? Unless you had reverse oil pickup tubes in every valve cover that returns the oil to the crankshaft, rods and piston pins? Those things were something that should not have ever happened in the world of engineering? But I guess with enough determination and money we can accomplish just about anything? Huh? Lol! So their whole purpose of having the entire engine spinning was to help increase its cooling capacity and never having a hot cylinder or head. But who cares about heat when you have a giant fan blade attached to these things anyways? Plus are flying up where temps are much cooler? I still cannot understand why the French thought this was a necessity to do on a airplane radial engine? But at least we can say, nothing is impossible these days LMAO! And again thank you for making these videos, you impress the hell out of me with your amazing skills and abilities! 😉

[@Desmouffe]

Thank you, but I'm just a curious guy who needs something to keep my head busy

[@grobischmiede9301]

Hi Greetings from Germany You have very good projects !!!!;

[@Desmouffe]

Thank you. Nice to hear and more is coming...

[@demmarcsxr]

How does the fixed connecting rod work?

[@Desmouffe]

The master rod works like a conrod in general. The difference is that it has four other rods attached to it. My new masterrod is very similar to the old one. 1 mm shorter for lower compression, made in aluminium so it's lighter, and the positions of the pivotpoints is changed.

[@Mr.Avuncular]

Where did you attain your maching skills,industrial,automotive,aviation or some other field? Your sub from Oregon 👍❤️🙏

[@Desmouffe]

I was an electrician, but 40 years in the swedish industry in various places you can't avoid contact with a lathe and other machines. I was working at the Husqvarna factory for 9 years and also at the Husaberg factory later on. You learn as you go.

[@Mr.Avuncular]

@@Desmouffe wow that's a really great road to maching....at the Husky factory now that's nifty. Thankyou for sharing,it's always cool to find how people spend their time,and what they do in their off time. You have quite the arsenal of machinery to work with too!👍❤️🙏respect👍

[@scottj273]

Wow, I'm from Oregon also!