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I spent the whole afternoon lapping the piston, yesterday. Almost there. Maybe a couple more times today. One quick question. Minh Thanh, you refer to TDC when fitting the piston. Is that where the intake/exhaust port is located on the cylinder? Of course, anyone else can chime in.

Thanks Minh Thanh. I am just trying to get an idea of how the fit should feel.

Hi Minh-Thanh. Just to clarify. What I should attempt to achieve is .03mm (.00118") to no more than .04mm (.00157") under the size of the bore after lapping, is that correct??

Great job!

Jason, on your "Firefly .46 Build" in a UK forum that you linked in another thread, concerning the piston, you stated "[t]he wrist pin hole was then done making sure not to break through and allowing for the dia being larger than finish size." What was the reason for not to "break through"?

In one of my previous threads on cylinder lapping, I learned quite a bit about internal lapping thanks to all who responded. Now it is on to another adventure in learning to make an external lap tool. Learning a great deal with this engine build.

Been working on Sheet 5 of the Webster. Got the flywheel, crank (still needs some sanding), crankshaft, crankpin (not finalized yet), and bronze main bearings, pretty much done. Photos below of current state of build. Now on to Sheet 6, the piston and oil tube. In my other threads on this first...

Looking great.

Ray, I have been whittling away for several days now at a flywheel for my first I.C., the Webster, much smaller than the ones you describe. I thought it was mild steel; but, it is much harder (rounded some of my HSS lathe tools). I still have one side of the flywheel to go, as far as the...

Looking great, and have a wonderful vacation.

Thank you, Minh Thanh. As always, you have been extremely helpful.

Working on the Webster. In the process of making the Crankshaft and related items. Made a weighted style crank. In process of making the shaft. I have a question on the bronze bearings. The plans say to "press them in with the flanges toward the inside of the engine,...". Trying to confirm that...

Thank you for your replies. Good to know that the discoloration is normal. Also, appreciate the tips and the links provided for silver brazing. I guess I got lucky on my first try, as far as strength of the join goes. Attached are some photos (sorry about the poor quality), and criticism (not as...

I did try some silver brazing today with the new Bernzomatic torch and propane, on a practice piece before I do the crankshaft. It is a very strong connection; however, what was once the color of steel is now a dark grey, and it doesn't wire brush out. I did get both pieces of steel red hot...

I hope that the hose kit I purchased takes care of that. Please let me know what you think.

Interesting that you should post this, because I contacted Bernzomatic as well last night and was emailed the specs as shown below. So, I cancelled the order for the 8250 just got back from a local store and bought the 8000 with a hose kit. Should be a little better. Going to try it out later...

Cranking (pun intended) right along. Enjoying following this thread

Well finally went and ordered a torch like the one on the Muggy Weld website and used in their You Tube videos. It is similar to the Bernzomatic mentioned by Peter which was unavailable. It is one of the ones that Chazz has. It is the Bernzomatic 8250HT like the one in this link...

I am thinking I may get the Seivert DS2944 that I linked. Or, is it overkill for the crank to crankshaft connection on the Webster engine and maybe a small boiler in the future. Or, would one of those Bernzomatics like the 8000 torch suffice for this job and a small boiler in the future. I may...

Thanks Chazz. At this point, I am seriously considering the Sievert DS2944 that I linked above: https://www.amazon.com/Sievert-Industries-DS2944-Torch-Kit/dp/B00OTJ1I72?tag=forumyield-20. Price seems very low compared to other places.