gemellocattivo.com

Well, its every bit as much a such job as I suspected. About 45 minutes to get the piston in and 70 minutes with the course stones to get to .0025 clearance on the 1st hole. My plan is take the last thou with the fine stones so on to hole 2

You want 0.0035 P2B clearance? That strikes me as pretty high.

That's the JE min clearance spec....remember these are forged not lost expansion castings.

As I finished up the 4th I realized they were not turning out as good as I thought. I was sliding the piston in up side down so I could hold it easily and all seemed fine, but flip it right side up and it became clear the bottom of the cylinder was coming out undersize, at last inch maybe. So I stopped, pulled the liners and cleaned everything up (I use a little sealant on the o-ring because I don't trust the seat in the block that is made of weld).

Tomorrow I'll set the mill up to hone these. Out of the block thy heat up fast, the last time I remember I kept rotating thought them lie 10-15 minutes at a time...so will probably be the plan again.

CP recommended 0.003 for mine in the Northstar

You have a larger bore than my 86mm too so that is confusing.....JE might just be playing it safe.....I don't know.

I found the fixture and setup the mill this morning


The 4 tapered cylinders straighten right out. I moved the last on the rear bank and was ecstatic that after like 5 minutes each the pistons dropped in and I started the other 6 while these cooled.....then I kind of realized that the machine shop had played with the other 2 and not in the block the cylinder flexes easily....so yeah, it was 30-40 minutes each before there was any need to even try measuring. Right now 7 are an honest 2.5 clearance and the other 5 are maybe 1-2.

On the mill held by the flange the spigot heats up fast, and also flexes a lot, which makes it expand and not hone nearly as quickly as the flange end so there is a chase the taper game where I kind of guess how much extra time to spend on the spigot then after a couple minutes the WD-40 is smoking and its time to move to the next. I'm getting there but this is why I really wanted to pay the shop to do it....and my should aches now after running the quill all day.I'm guessing 6-8 more hours to get them all finish at 3.5.

Its taking a lot longer than I'd planned. I was in the shop at least a couple hours every night this week and I'll probably be still honing all weekend, not moving on the fitting the main bearing as I thought. Looks like bearing will be next weekend. At some point I will be recalled to house work so I need to pick up the pace on the engine if I want it running this spring.

In other news the graphics place making the tach face stickers had to re-do the conversion from CAD to pdf for me....I was so proud of that effort but they were not so much happy with it...and I honestly didn't understand why....but they fixed it, sent a pdf for approval and I assume are now making them.

Still honing......when I said they were all at 2-2.5 that was a lie. They are so thin that a snug feeler gauge is probably a couple thou, a tight gauge maybe 3 or 4. Now they are all an honest 2.5-3+. This was clearly not the right way to do this job but I'm nearly done.......

Last night 1 cylinder got to the point that is was time to move it from the course stone line and into the fine line! I decided the original plan of .001" with fine stones was stupid, so it only needs another 1/4 to 1/2 thou. progress.......