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I was thinking of making my head gasket out of copper chimney flashing. Does this sound as if it would work?

It will actually be a relatively large engine. 2” bore. Both valves operated by cam, pushrod,rocker.

Anyone know of a rule of thumb for calculating valve spring size/spring rate for a small gas engine? Any advice on selecting or sourcing springs?

I finished bore with 400 wet/dry over hone, and then put in crosshatch as best I could. Looks much better this time.I’ll check for taper (with snap gauge) one last time, and if it’s not tapered I’m going to call it good, and move on to the next phase, which I think will be casting the piston...

Wow, I’m getting quite an education here. I want to thank all of you.

I’ll try putting in crosshatch with 400 paper.

Yes,my latest plan was to polish out the first 220 crosshatch attempts with 400 wet/dry and then go back and try again to put in crosshatch with 220 hone.I’m not really trying to get to a certain size,as piston and rings haven’t been made yet. I was assuming crosshatch should be relatively deep...

On the advise of XD351,I used wet/dry paper with my hone, which worked very well. I then tried putting crosshatch in using 220 hone, and am not really thrilled with the results. Angle of crosshatch is shallow and irregular because drill speed and in-out motion were hard to regulate. I’m going...

XD- I was thinking about trying to use some fine wet and dry with the hone, but I thought the paper might stick to the bore,with the hone running over the back of the paper. I will give it a try. As for the three rings-My plan was to drill a hole down through the side of the cylinder,into the...

Thanks for the replies. I haven’t made piston or rings yet but I was thinking three solid cast iron rings. I have no idea what RPM to expect but would like to try to keep it as low as possible for heat/ wear/ stress reasons.

I’ve bored my 2” cylinder and honed it to the point where it doesn’t seem to be getting any smoother. It is very smooth to the fingertip, but I can see rather coarse looking hone markings, that can barely be felt with a fingernail, I was using a 220 grit, 2-7” hone. I am thinking bore needs to...

Hello, After looking at some of the amazing engines built by members here , I decided this might be a good place to hang out and maybe get some help with the rather crude engine I’m building. I’m using a beat-up 9” South Bend lathe, drill press, grinders and hand tools. I did work as a...