Search results

I wanted to install the cylinder liner into the block and turn the fins for something to do while I waited for my bearings to come in for the front cover. Since I didn't want to grab the relatively fragile fins in the vise, I decided to finish the lower end of the block now. Gus showed off using...

Thanks! Makes sense.

following along because I'm on the edge of my seat watching you troubleshoot. I have a feeling you're very close!

can you describe picking up the punch mark with the sticky pin? Is it just a visual thing? Watching for movement as it enters and exists the punch depression?

I use a chunk larger than necessary to do the cylinder liner so that the 3 jaw chuck doesn't distort it any amount that I care about. Grab it in any old chuck, and pop a bore in it. Oversize by 0.001". Darn. Not that it matters, I can just make the piston to fit whatever I end up...

yeah I did this to swap between my lathe, dividing head, and horizontal mill. Very worth the effort.

Glad I saw your build, your fixture is exactly what I need to deal with some lather bits on my engine. Was trying to figure out how to hold it because I've got a cheesy vise. The angle plate setup looks like it's just the thing. I'll have to follow along for the rest of it!

thanks, that's extremely helpful! Similar bore, so I should be able to use your numbers for the shrink fit. I was going to go for 0.0015 over, but maybe that's too much. I like the idea to have it drop out so I can make adjustments later. I've made mistakes in the past that have caused excessive...

Time to think about the liner a bit more before I start making chips. I might attempt to thin out the middle of the connecting rod a bit so that it won't contact the cylinder liner at all, and I don't need to make that notch. If I make it a round cross section, the notch could be very small and...

Yesterday's progress. Front and rear recesses cut. Time to run down to the post office and grab the steel for the liner and do a bunch of lathe work on the front bearing holder. Going to have to start planning out a head soon. 4 valve DOHC, or 2 valve DOHC? I want to use double...

Thanks! Was that in steel? I noticed nuts often have only 3 or 4 threads, and now I understand why.

Current design iteration. I expect it'll change again until too much cutting has happened. I keep cutting and cutting but it's still too short! ;) I'll probably round the top corner of the front cover with the cooling fins. Might as well make it flush with the front too. The piston design...

That's a really good idea. I haven't considered that. I definitely will consider that. If I screw up and have to make another block I'll definitely put some time into that, but I think I'm going to keep going with the aluminum cooling fins because I'm half done the block already and I intend to...

I'm so glad I got caught up with this thread. Thanks for all of your detailed diagnostics and math, it's really helping us that are getting started designing an engine from scratch! I really love the sound of the thing. Very nice!

Yeah I'm trying to get as many pictures as I can as I go, since I always have my phone on me. I tend to do all of my considering infront of a computer, then print out a plan and get to work machining with an audiobook playing. I'll probably be able to quote the job in units of completed...

That 3/8" shank 2" long boring bar wasn't doing the job. It narrowed down to 1/4" or less between the carbide tip and the 3/8" shank. I decided to modify my boring head to take my 5/8" shank boring bars. Much better. 1.625" crank case bore. It'll be a spacious crank case. I'm hoping to have a...

Yeah exactly. I chose a random chunk of random stainless too, it was easy to turn it too fast. Had to finish the slot off with a hacksaw, which is ugly. Still works as a tool though, which is what counts.

Yup, good learning lesson. Any suggestions on feed per rev on something like this?

oops, I left the oilers turned on and went to bed last night. I just emptied 3 ounces of fresh oil onto the ground.

Got some holes bored. It's not very interesting. Squaring up the end. There's a broken bit at the bottom of my knee screw so I can't get it high enough so I set the vise up on 123 blocks. A little sketchy looking, but it seemed to work fine. Cylinder liner hole bored. I changed my tactic a...