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FINISHED CRANK 25mm mains 20mm crank pin 24mm outboard of mains 50.8mm stroke Counterweights bolt on as separate pieces

STARTING THE CRANK Now getting started on the crank. Roughed out on the mill, now doing the first lathe roughing operation. The fixturing foot at either end of the crank has the centers for the crank and crankpin, one inch apart to give the 2" stroke. The counterweights will be bolted on to...

Shhh. Don't say that out loud. Tell her she doesn't look a day over 9.

I have tried making several kinds of pumps with seals (and no seals) in all different locations. Based on my success rate, they all fall in one class, for semantics sake, : PITAs. Without having a factory of specialized precision equipment, even if you do the very best you can, there is still...

A little medical humor Monday, I had a small cancerous lesion removed from the skin at the corner of my eye right next to the bridge of my nose. It was done in the office, and it wasn't the bad kind of cancer. They used a Mohs process to make sure they got everything. Then I had to wait an...

The possibilities look limitless. Very professional looking.

I like to take the approach to testing, that its main purpose is to prove that all the design work and calculations are correct. Let's get back to the clearance of the rod to the piston skirt and cylinder liner. Both the calculations and the drawing layout showed that the clearance was going to...

I agree about the necessity (EXTREME NECESSITY) of filtering the youtube videos , but I have saved so much money over the years with repairs that "almost" knew how to do. The first videos that I reject are the ones that start, "Uhhhh, I've never done this before, but let's see what happens." As...

@Steamchick , I have read enough of your well thought out posts to know that your head and heart are always in the same place, the right place. So, no upset or offense to either of us I hope. But I do understand your point about conciseness of our descriptions. Sometimes the attempts at humor...

And, @Steamchick , while I am on a roll (and have not taken offense, nor meaning to offend), my original comment about "the rod profile needs a little shaping for adequate clearance tot eh liner and skirt," was for shaping that was in my previous planning of hand shaping to mimic the inside...

Steam, I know that you have a thick skin, and a sense of humor, as do I, so we might have to agree to disagree on this one. There is a wide latitude between complete planning, and unprofessional bodging. For hobbyist work , it is usually a matter of the time budget or the tools available. I...

The conn rod looks out of proportion to the piston, but it is a diesel, and the stroke to bore ratio is 1.30, so I will accept it for what it is. The original Detroit Diesels were 1.18, but I wanted to give as much combustion travel as I could. The DD was about 3.7" (out of the 5" stroke) and my...

PISTON, ROD, WRIST PIN Here are the rod, piston, and wrist pin. All finished/semi-finished. The rod is 117 mm C to C. The conn rod big end bore is roughed out until it is time for the bearing/bushing. The rod profile needs a little shaping to give adequate clearance for the piston skirt and...

PISTON Now that I am past the injection (an almost fatal consumer of good shop time), I can have fun again. I made the piston last night, but it still needs ring grooves, after I have the rings. There are lots of 39mm rings available, and after the injector debacle, I will be buying the rings...

Off of dead center I am finally off of dead center on this project and have a top end, including a unit injector working like I think it should. There are a half dozen injectors in the scrap box, but this one, with its synchronized low pressure pump seems pretty close. I had to turn the fuel...

@Niels Abildgaard Niels, might I suggest you take a look at this. http://www.dragonfly75.com/moto/CBinstr.html I just purchased his crank balance calculator spreadsheet for my 2 stroke diesel and it is very very extensive and complete. The what-ifs for the design phase are pretty much limitless...

Hi Sarah, I looked up the cross reference to EN1a and see that in the USA it is known by the SAE spec of 12L14. That is a very popular leaded mild steel of medium strength that machines very nicely, "a leaded free machining steel." I have used lots of it and have pieces of it in my metals rack...

Ok... please help us out. Always ready to learn. Lloyd

Very interesting and enjoyable discussion, and @NapierDeltic Thank you for dropping into the middle of it. @minh-thanh , I definitely hear what you are saying and that's why I called it a conundrum. With the use of different grades of gasoline, and antiknock additives, and knock-sensors to...

Ha ha, I guess we will just have to accept the fact that each of us is right, and the other person is wrong, haha. No hard feelings, of course. BTW, I have seen compression temperatures and auto ignition temperatures listed in many places with wildly varying numbers. A solid consensus seems hard...