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Thanks Steve that's what my initial thoughts were. There are a few surface such as the cylinder mounting locations that I'll need to leave the final cut until they are bolted together but I don't see that being an issue. My real challenge will be at the bottom of the right case where the oil...

Here are some pictures of the crankcases. If anyone has a best practice on the best method for order of machining or how to best hold the parts I am open to suggestions.

I was able to save the part. The bottom has some damage due to the miss cut but I'll be able to smooth it out to the point it won't be noticeable unless you look specifically for it. I finished the outside machining. I only need to do a little cleanup along the edge. I was debating leaving it as...

Never cut corners. Pun intended. For full disclosure I wanted to show a mistake last night. I broke a drill bit in one of my holes and couldn't get it out blind. I decided to move on with machining the top of the primary cover and when I broke through into the the hole I would be able to dig the...

After looking deeper at both sizes in the plastic models I have determined I should go for 1/3 scale. I question my ability to make a spark plug small enough for 1/4 scale and keep the plug from looking out of place. With the decision of scale made, I was able to get on the mill and start...

After many years and moves causing files to be lost, I have caught back up in replacing the loss. The only parts previously causing chips were cylinders so I decided to print the parts. Now holding the scaled plastic model I can only debate keeping it 1/4 scale or going to 1/3 scale for the...

Lets do it! It'd be cool to meet some of the scaled engine guys in Michigan. I'll put all of you too work on some of my other projects. ;D

It is coming closer. The models for the heads and rocker boxes are nearly finished. I have next week off so with any luck, I will be able to start making some chips over the holiday.

Thanks for the comments everyone. I see we have a dirt track fan! It was definitely the sport of the past but they are trying to get more interest. Once the races get going again I'll get a schedule up for anyone interested in going to a race.

Attached are a few more pictures of my CATIA files. The left and right cases are pretty much buttoned up as well as both cylinders. I am working on the heads during lunch breaks and started the rocker boxes tonight. I plan to start the machining process as soon as I complete the drawings for the...

I would agree that model engines wouldn't match that type of configuration (96mm bore with only 35mm height). That scaled down would be like running a dime as a piston. The 2.5" rod x 1.5" stroke with .25" of piston underhang at bdc I referred to are from specs in his other post.

In the modern automotive world, a rod to stroke ratio of <1.8 is considered "short rod" and a ratio >1.8 is considered long rod. Motorcycles tend to run shorter rods because of their compactness. With a stroke of 1.5" a short rod would be considered a rod <2.7". A typical high revving motorcycle...

There isn't really an advantage to letting the piston run out of the bottom of the cylinder unless you wanted to say that there was a reduced friction point near bdc. To make that argument you would need to also take into account that this is near a slow piston speed location of the stroke where...

Sorry for no updates. I promise this isn't a lost project, the Masters degree takes up a lot of time once classes start back up. I'm finishing up the right case along with the cylinder heads. I'll have to get more images at a future date. -Jordan

I've got most of the cam cover setup in CATIA. I'd like to do the cases next so I can get started on machining to help break up the measurement time.

I've been watching and reading for a little while on the site now and have finally started my first scale project. I'm an engine development engineer and race engine builder so I'm not new to machining but this will be my first micro build. I started yesterday by getting together some parts and...

I have a two part rubber that I use for carbon fibre molds. It is a slight grey color but I would imagine that adding a pigment to it that I could get it to turn black. I'll get you some more information once I get back from Wisconsin but one of you is more than welcome to have some for a test...