Engines > From Plans
Rebuild time for my Upshur single
Art K:
The next thing I did was to switch to the "high speed spindle" and machine the cooling fins. This is the end result.
This job took 5 and a half hours...just kidding but I did do a dry run so I did sit and watch the machine for that long. I used a .047" end mill and cut to a depth of .362" 20,000rpm@35 IPM and .0015" per pass. Theoretically Sprutcam thought it should have taken 30 minutes less, but didn't take into account the time it took to slow down going around radius & corners.
I will slowly post what I have done and get you all caught up. I am still pondering how much I want to do, for example I think the rod hitting the cam specifically damaged the exhaust valve but do I want to replace that now or later. I think time will tell as I intend to have it running for the NAMES show.
Art
awake:
Beautiful!
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Art K:
Andy,
Thanks for following along, it's good to know that people are keeping track of what I'm working on. I have made a few other parts like tappets & guides as well as manifolds that I can press into the head and bolt the carb & muffler onto.
These are the lifters and guides. I am planning to redo the lifters because I put divots in them when I chucked them on the second side to face them to length.
This is the family photo so to speak. With the new & old head side by side. I am missing a photo so I will have to add one later. The aluminum bits are the press fit manifolds that I've done the oval treatment to and drilled & tapped 2-56. this now gives me a platform to bolt on anything on that I can make an attachment for. previously to remove the carb, manifold ect. I had to twist it out with a pliers.
This is what it looked like at the 2019 NAMES show. I've had the intake straight out 90 degrees down as designed and as shown in the photo. I only set it up this way cause I didn't like it spitting gas under the carb. More later, please if you have any questions, ask.
Art
AlexS:
Great job of your start on rebuild this engine! May I ask how your build en designed the PCV on your crankcase? I have to build that for me engine soon. Are you redesign the conrod or cylinder so they don't hit each other? This engine is a full plan build or own design? I am wondering what reason is if it is a plan build.
Greets Alex Succes! :wine1:
Art K:
Alex,
If I understand what you are asking about the PCV, you are asking about the crankcase ventilation? If so that would be the round brass cap with holes in it. This is just behind the cylinder in the previous photo. It is where Hamilton Upshur designed it in a dry corner. Its just stainless tubing with one end pressed into the case & the other into the hollow brass breather which has green scrubby pad wrapped around the inside. I wasn't planning to change any of the internals. There was only a problem when the rod wore and then shifted a portion of the rod with a larger diameter upwards. There is clearance for the point where the rod is designed to pass, but not the larger diameter. I had thought about redesigning the rod but because of the restricted clearance inside opted to go as designed.
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