I was doing some shop cleanup and organizing the other day and ran across this crank shaft that I had made close to 3 years ago. At that time I had built a flat twin engine that did run but not very well. After a lot of fiddling around and some disappointments I decided to use some of the parts off that engine for my 90 degree v-twin engine. That engine turned out to be very reliable and a good runner.
I thought maybe I should take another shot at building a horizontal twin engine I can't just throw the crank away.
I found a pair of piston and rod assembles that I had made for a different engine at some time and remade the connecting rod bearings to fit this crank.
![IMG_2478.JPG IMG_2478.JPG](https://cdn.imagearchive.com/homemodelenginemachinist/data/attachments/105/105020-ba84bca4538e0ce36ede3a6c1d6b9af9.jpg)
This might be a good time to experiment on a bolt-together engine. No castings or large lumps of aluminum just flat plates screwed together in a simple way.
Since the crank, rods, and pistons are already made I will have to build around these parts.
I started with a couple of 1/2" aluminum plates and installed a ball bearing in each.
![IMG_2483.JPG IMG_2483.JPG](https://cdn.imagearchive.com/homemodelenginemachinist/data/attachments/105/105021-3647e484afd9c6131a8bdb29dfae239f.jpg)
So here is the starting point.
1" bore and 1" stroke.
![IMG_2486.JPG IMG_2486.JPG](https://cdn.imagearchive.com/homemodelenginemachinist/data/attachments/105/105022-89957fbc81263b61945686001aea6b5a.jpg)
Thanks for looking
Ray
I thought maybe I should take another shot at building a horizontal twin engine I can't just throw the crank away.
I found a pair of piston and rod assembles that I had made for a different engine at some time and remade the connecting rod bearings to fit this crank.
![IMG_2478.JPG IMG_2478.JPG](https://cdn.imagearchive.com/homemodelenginemachinist/data/attachments/105/105020-ba84bca4538e0ce36ede3a6c1d6b9af9.jpg)
This might be a good time to experiment on a bolt-together engine. No castings or large lumps of aluminum just flat plates screwed together in a simple way.
Since the crank, rods, and pistons are already made I will have to build around these parts.
I started with a couple of 1/2" aluminum plates and installed a ball bearing in each.
![IMG_2483.JPG IMG_2483.JPG](https://cdn.imagearchive.com/homemodelenginemachinist/data/attachments/105/105021-3647e484afd9c6131a8bdb29dfae239f.jpg)
So here is the starting point.
1" bore and 1" stroke.
![IMG_2486.JPG IMG_2486.JPG](https://cdn.imagearchive.com/homemodelenginemachinist/data/attachments/105/105022-89957fbc81263b61945686001aea6b5a.jpg)
Thanks for looking
Ray