Engines > From Plans

Rebuild time for my Upshur single

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Brian Rupnow:
Art--You have done a beautiful job on that muffler. I made one for my flat-head engine, and was quite surprised about how effective it was.---Brian

Art K:
Ok, I haven't sat completely still. I have been redesigning the cam. Trying to keep everything on center-line with the crank and the cylinder and block.

This is the finished cam blank. I did have one minor mishap, after finishing the first side pulled it out of the lathe to realize I had turned the wrong end and had to drill & tap the other end 4-40 as well. I just picked the wrong end of the print to read first. I am still thinking on what I want for a cam profile. I might add a larger nose radius to it and leave everything else the same.
Art

Art K:
Hi everyone,
After some problems I now have a new cam. I had the program written two weekends ago but, I had some problems with my mill and couldn't run it. I couldn't zero the Z axis on the mill. I had even run the program an inch above the part, dropped it down & had to shut it down before it crashed. At that point if I zeroed it, it changed the number to .3645, if I tried to edit the number it was changed to something like .3625. The program runs between Z0 and .073. At that point I gave up and asked my nephew if he could send me my PathPilot flash drive, which he did. I had intended to re install the PP operating system and updates and try again. A week later it still hadn't arrived. He's going to check on it and find out where it is. This morning wanting to finish the cam I fired up the mill and presto it worked, so the end result is this cam.

The dimensions are straight out of CamCalc. I had designed a different cam profile for the exhaust cam, but after the intake cam machined properly I didn't want to take a chance Murphy would show up and screw up my cam. So the settings in CamCalc you see in the upper left hand of the photo are the ones used in both. It was a lot of work to add 180 steps to the program but it does work, takes about 24 minutes and with a little editing will work on any cam profile. Adjust Z Y & X and you're ready to go. If anyone is interested let me know I will pass it on for others to use. I know it works on my Tormach and you would need a 4th axis these are my only disclaimers.
Art

ironman123:
Great work on the rebuild Art.   What is the distance between the cams?  Not sure if it was 0.250, 0.281.  I don't have my plans anymore.   I know I loaned to them to someone that wanted to build one after seeing mine.   To many years gone by.  Don't remember who it was.   I could get it close by measuring ctc between the cam followers on my engine and adding about 0.128 on each side of that.

I am wanting to redo my camshaft also.   When I built mine I remember the lobes were not the same, now I want to correct that.

Art K:
Ray,
I have slowly been working on the rebuild. I lately have been working on a new rod. It has been hard to get motivated to do anything on it recently. Work has been crazy busy and we are slowly treading backwards. I looked on the blank in Alibre and I did a centerline in the middle of the cam to center it on the crank and the block. The cam blanks are .230 wide and .145 from the center to the edge of the each of the cam lobes that comes to .290. I didn't open the magazine to look but I did design the cam based on the print. If you need any info to make a new cam I could help you with the prints as I have the Strictly I.C. magazines yet. If you have a cnc I have the program I used to make my cam lobes. If you don't like that profile you can go to Cam Calc figure out what you want and change my settings to suit your needs. If that would be helpful send me a PM and I'll send it to you, or any other info you need from the print.
Art

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