Homemade Radial Engine part 1

[@airgunningyup]

as a machinist , this is incredibly impressive .. The patience required is unfathomable

[@ianjimmerson12]

What I wouldnt do to live next door to you! I build radial engines out of wood... that obvioulsy don't run. You sir, are a legend in my book. I just watched all of your radial videos. My hats off to you!

[@Desmouffe]

Yes, that would have been nice.

[@ChargerMiles007]

The only thing I can say about this engine build is Holy Sh*t this is incredible! The design time, the cost of the metal, and the hours of machining are fantastic! I will do everything I can to spread the word about your HUGE achievements!

[@kasuraga]

For real. I'd LOVE to see some long format videos of these incredible builds. This dude has insane machining talent.

[@jd70HJ19]

Now ....this is the sort of talent that impresses , amazes and s truly deserving of praise. Unfortunately there is no venue outside youTube where talent like this could entertain the masses as opposed to the Television drivel aired daily .

[@Desmouffe]

Thank you. Just doing this for fun.

[@nedshead5906]

Amazing, I can't even comprehend how you plan and design such a build

[@Desmouffe]

Many hours and cups of coffe in front of the computer before the first piece was made.

[@carlsbl]

Holy crap!!!! 😀 Amazing job and skill set!

[@Shadow-eo2pf]

Always wanted to see something like this made form a Briggs flatheads and dude your making the dreams come true, between the v8 Briggs flatheads to a radial!? Come on that’s cool! Next is a two stroke radial

[@Desmouffe]

That will be difficult with a common crankcase. But I will rebuild the crankshaft as soon as V8 is finished.

[@dakrushel]

Hahaha I love it! I'd pay a pretty penny for a lawn mower powered by a 5 cylinder radial!

[@therealgaragegirls]

Wow! You made your own cylinders, liners, and heads?! 🤯

[@Desmouffe]

👌

[@lorenkargard8303]

U sir are a master

[@lukeamato2348]

Im currently working on my own engine design, im trying to make a straight twin, turbo 500 cc hybrid with an mgu h . Its alot more than i bargained for , but its coming along. Your video gives me hope ill be able to get it running

[@Desmouffe]

Please post pictures and videos

[@lukeamato2348]

@@Desmouffe i will once i get the block and cylinder head cast

[@terryburnett797]

Would have liked to see the milling too. Amazing job.

[@Desmouffe]

After discussing with skilled people on this forum , it's clear that I have to take it apart again an do some updates on the crankshaft. This time I will take vids.

[@jeepwk6.5L]

@@Desmouffe skilled people in this platform is a very bold statement 😅

[@tim777jet]

Amazing achievement, there is so much design and thought that goes into projects like this and a lot of dedication, I built a radial as well, the balance and lubrication system are big topics on their own. What aluminium did you use for the conrods. What valve timing events did you use, so many individual parts of the design that take a lot of though. Excellent engineering and love the casting process. Well done sir.

[@Desmouffe]

Thank you. The conrods are made of standard aluminium bars EN-AW6082 with bronze bushings at th ends. The master rod I was afraid to do it in aluminium and a steel one should be to heavy, so I had to compromise. The rod in aluminium and the center in steel. Rivited together. I still had to make quite a big counterweight. For the valve timing I used one camshaft with teo intakelobes and two exhaustlobes, rotating with 1/4 speed of the crankshaft and in the opposit direction. Not my idea but there are many helpful people and a lot of information on the internet. I looked at your videos. Very nice build

[@tim777jet]

​@@Desmouffeto calculate the balance i used the total of all the rotating weights plus just over half the reciprocating weights (0.509), I found an old document with that figure. Yes the radial engine is a challenge and unique especially the cam drive system. I used 5 camshafts in the end driven conventionally with chains. I used light valve springs to reduce the loads on the system.

[@Desmouffe]

@@tim777jet That number sounds familiar. I found a document posted by one W.B. Richard with a formula. Maby the same one....

[@tim777jet]

@@Desmouffe the balancing is interesting because by the nature of the design, the cylinders do not reach their top dead center at the actual equal number of degrees around. For a 5 cylinder engine that would be every 72 degrees, but they vary because of the master rod geometry. Only the master rod piston is correct the others will differ by a few degrees. That means the ignition timing and cam timing will alter. On old WW2 engines I believe the distributer cam that operates the points, was ground not equally but offset slightly to oprimize the ignition timing for each cylinder. I have 5 sets of points and each one is individually drilled off to exactly its own cylinder top dead center. My cylinders vary by about 4 degrees on 2 of the cylinders and 2 degrees on the other two cylinders if I recall correctly. If everything was set up at exactly 72 degree intervals, with the master cylinder set at say 5 degrees ignition advance , two of the cylinders would be advanced just 1 degree and two cylinders just 3 degrees. For this reason I think radial engines can never be truly balanced because the geometry prevents 4 of the cylinders moving in a perfect rotary motion as the master cylinder does. Radials are amazing engines and the more you research the more strange things you find out.

[@Desmouffe]

@@tim777jet I did not know that but of course, You're right. Maby the solution should be making a new crankcase that's not a perfect pentagon. Adjust the angels between cylinders. That would correct both valve timing and ignition. I use B&S original ignition coils and flywheel. Something to think about if I build another one.

[@victoryfirst2878]

What made you choose the radial engine type Sir ??? Very nice work too.

[@Desmouffe]

I have always wanted to build my own engine but build a single cylinder engine out of lawnmower parts feels a little bit stupid. But I love radial engines so why not. Maybe not the perfect choise for my first petrol engine but, Hey , IT RUNS...

[@victoryfirst2878]

@@Desmouffe I made a two cylinder opposed engine using a Scotch Yoke between the cylinders. That was years ago. KZbin was not even know. Worked great with super low gas consumption. Keep up the great work Lyckebo. Look forward to see more great videos Sir. vf

[@victoryfirst2878]

@@Desmouffe I like the lathe you have Sir. Have to get me one too one day soon.

[@Desmouffe]

@@victoryfirst2878 Interesting construction. I had to google it. Must be easyer to balance

[@victoryfirst2878]

@@Desmouffe I remember the balancing was the hard part. But when balanced the unit really worked smoothly and was super good on fuel. Really surprised me of the efficiency. Good luck Sir.

[@fpmmichael342]

The engine build is incredible. However, it must be the most underpowered engine EVER if it can only power that Tiny, tiny mower. 🙂

[@Desmouffe]

I had to put it somewhere.

[@fpmmichael342]

@@Desmouffe It is an amazing project. Hope you can put it on something that will really show off the performance.

[@tim777jet]

Did you fix the master rod with 2 large rivets ? . It is amazing how the master cylinder piston takes all the anti rotation forces of the other cylinders while moving up and down. I imagine having the engine horizontal alleviates the hydrulic lock issues with the oil run down when stationary. The aluminium rods I made were 7075 . I was not concerned with the compressive forces but the tensile forces on the exhaust stroke are a concern especially when the ally as at running temperature which reduces tensile strength in ally even further. Did you use a slinger arrangement in the intake system to help distribution. I went for 5 seperate carbs. I tried vacuum gauges to balance but was hopeless. I balanced them old school in the end by removing 1 plug cap at a time and tweeking the idle stops until the rpm drop was the same, worked well. Thanks for your reply. Cheers Tim

[@Desmouffe]

Yes, two steel rivets. For the calculation of the counterweight it was important that all pistons and rods had the same weight. And maby it was possible to do the masterrod in aluminium, I dont know. I's my first petrolengine. Not the smartest choise to do a radial as the first build....

[@ToplessTattoo]

You wanna cut the grass or send it back in time?

[@Desmouffe]

Together with Marty McFly and dr Brown