Philjoe5
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- Jul 12, 2007
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I'm not sure if this post goes here because I do have a running engine but since I'm not finished working on it, I guess it's "in progress".
Heres an update on the mill engine I've been working on. Its 1.5x larger than the scale model I'd built previously. I decided to try this approach because the basic engine design is pretty rugged (in my mind) and it would give me practice in taking a set of engine plans and rescaling them (either up or down). What surprised me the most was the actual magnitude of a 50% increase in size. For example, shown here are two connecting rods, the 1x and 1.5x scale.
Here are all the parts arranged on the half inch steel baseplate stock
I need to machine the baseplate and eventually paint it. Its a piece of steel ½ x 8 x 24 and itll be a challenge to work with since its dimensions in the x-y directions far exceed my mill/drill table capacities.
I made a protoype of the baseplate using ½ plywood. A photo of the engine mounted on this temporary baseplate is shown here compared to its original scale model:
The video of the engines first run is shown here. As soon as I assembled this engine it ran but it wasnt too smooth. Tweaking the valve timing improved that.
[ame]http://www.youtube.com/watch?v=SY56iahDoGs[/ame]
After about 30 minutes of running Im able to run the engine now at about 5 psi and the movement has gotten smoother. Ill spend a few weeks on the permanent steel baseplate and get that painted then post a picture.
Cheers,
Phil
Heres an update on the mill engine I've been working on. Its 1.5x larger than the scale model I'd built previously. I decided to try this approach because the basic engine design is pretty rugged (in my mind) and it would give me practice in taking a set of engine plans and rescaling them (either up or down). What surprised me the most was the actual magnitude of a 50% increase in size. For example, shown here are two connecting rods, the 1x and 1.5x scale.
Here are all the parts arranged on the half inch steel baseplate stock
I need to machine the baseplate and eventually paint it. Its a piece of steel ½ x 8 x 24 and itll be a challenge to work with since its dimensions in the x-y directions far exceed my mill/drill table capacities.
I made a protoype of the baseplate using ½ plywood. A photo of the engine mounted on this temporary baseplate is shown here compared to its original scale model:
The video of the engines first run is shown here. As soon as I assembled this engine it ran but it wasnt too smooth. Tweaking the valve timing improved that.
[ame]http://www.youtube.com/watch?v=SY56iahDoGs[/ame]
After about 30 minutes of running Im able to run the engine now at about 5 psi and the movement has gotten smoother. Ill spend a few weeks on the permanent steel baseplate and get that painted then post a picture.
Cheers,
Phil