Smaller Horizontal IC Engine - 5/8" Bore

[rudydubya]

Nicely done as usual, Chuck.  I always learn something following along with your projects.  Thanks.

Regards,
Rudy

[Art K]

Chuck,
That sounds pretty good. How hot does it get w/o cooling on the head?
Art

[cfellows]

Thanks, everyone, for following along.  It does seem to get easier with each build and this is probably one of my best models in terms of fit and finish.  I'm very pleased with the way the cam turned out.  Much smoother than I would have expected and it never misses a lick.  I'm keeping it pretty well oiled so I don't think wear will be a problem.

Art, the top of the cylinder and the head does get pretty hot.  I think the cooling would be better if the intake valve was on the other side of the head.  I might have to add a cooling fan on the flywheel side of the cylinder.

I am planning to clean up the drawings and post them. 

Chuck

[Brian Rupnow]

Chuck--Did you use any rings on that piston?--Brian

[Tennessee Whiskey]

Chuck, sorry I'm late to the party.  That's one sweet runner,  seemed not to wiggle the least bit.  Super job. 

E

[cfellows]

Chuck--Did you use any rings on that piston?--Brian

Brian, I used an O-Ring.  Don't know what kind of material, just something I picked up at Home Depot in the plumbing department.

[Brian Rupnow]

Thanks Chuck.--I always use Viton, because I would be afraid of a standard Buna-N o-ring getting too hot and melting. You have done a great job on that engine, and have moved to a point where I can no longer follow you with my manual machines. Nice work!!!---Brian

[cfellows]

Thanks, Brian, now if I only had your skill with Drawings... So, I'm going to start uploading the drawings.  This is not complete, but if I upload a copy as I progress, maybe it will keep me moving ahead on them.  This truly is not something I enjoy doing, but I do understand the importance of sharing the knowledge.

I'll let you know which upload is the final version.

Chuck

[sbwhart]

I'm a bit late to the party Chuck but that's a really great engine you've created 


Great Job

Stew

[Captain Jerry]

Hi Chuck

Nice engine!  Great design!  I have looked in a time or two but since I have never built an IC engine, I didn't feel qualified to comment.  A few pages ago, you invited questions and I couldn't even do that.

That cross over cam got into my head.  I understand the principle and the general function of cams but the finer points of cam profile are beyond me.  I see that you have modified the path of the groove in your final design and I can see that it more closely resembles the cam that was your inspiration. 

I thought that your original design looked more regular in it's transitions than the current one.  Can you explain  what was wrong with your first design?   I think that I could machine something close to the first one manually with a rotary table but not so the last one.  If it could be done manually, more people might be tempted to try this kind of engine.

Jerry

Jerry

[Zephyrin]

great engine you have made, great design too, your R&D dept is really working hard !
thanks to unravel the secrets behind this cam, the whole story is amazing.

[cfellows]

Thanks again, guys.  I'm pleasantly surprised at how well the cam works and how well the engine runs.  I have a bit of a problem when I first start the engine.  It runs for just a couple of seconds then dies, I choke it, it starts and dies.  I think the fuel line is too small and it gets air in it after sitting for a while, because if I pressurize the fuel tank temporarily, it will start and run steadily for as long as I want.  I may increase the fuel line size from 3/32 to 1/8.

Jerry, the problem with the original cam was that it basically held the exhaust valve open for nearly a full revolution of the crank then held it closed for the next revolution.  The new cam holds the exhaust open for 1/2 a revolution, then closes it for 1 1/2 revolutions.  The groove has 3 basic diameters, the outer opens the exhaust valve, the middle closes it and holds it for close to a full revolution then the inner groove for the next half revolution.   The middle and inner groove comprise more than a full revolution and therefore have to be on two different diameters.  In the following image, the cam disk rotates clockwise.



Here is another video, after I got it settled down.  I also added a fuel tank lid and made a new timing adjustment lever.

<a href="https://www.youtube.com/watch?v=IvCVVX39SLc" target="_blank">http://www.youtube.com/watch?v=IvCVVX39SLc</a>

Chuck

[Tennessee Whiskey]

Chuck, I don't know what kind of power it will produce under load,  but,  you couldn't produce no sweeter runner 

E

[ogaryd]

Hi Chuck, I don't comment often but your engine design defiantly deserves high praises. A very unique idea and runs great on top of it all. What RPM does it turn? It appears nice and slow. Have you tried raising the fuel level to just under the carb inlet? Great job, Gary 

[Zephyrin]

Exhaust beats at 5 Hz, hence the engine runs at 600 rpm, and what a regular pace!