About a zillion small gas engines have a 2.25" bore. They've been working well for me.
Like these: https://www.ebay.com/itm/380211780861
Mike
Search found 1901 matches
- Thu Mar 17, 2022 4:43 am
- Forum: Technical - Engines and Boilers
- Topic: Better Piston Rings
- Replies: 14
- Views: 6332
- Tue Jan 18, 2022 3:46 am
- Forum: Members' Websites and Boats
- Topic: boat plans
- Replies: 14
- Views: 9756
Re: boat plans
I love the lines of Panatella but I have talked to people who steamed her and they said that the boat was amazingly unstable in roll and sensitive to crew placement. Needed more beam. I have no idea about your power plant. Size? Power? Weight? I am very happy with the hull I have built. Same lines a...
- Sun Jan 16, 2022 3:34 pm
- Forum: Members' Websites and Boats
- Topic: boat plans
- Replies: 14
- Views: 9756
Re: boat plans
I agree with what Bart has said. I went the Stitch and Glue route and have no complaints except that it's a moderate pain to achieve the small area of compound curvature near the bow at the chine. Nothing is cheap these days. My materials bill for a 25' hull, plywood, glass cloth and resin, ran $5K ...
- Tue Dec 21, 2021 6:47 am
- Forum: Anoraks Corner
- Topic: Christmas Puzzle?
- Replies: 4
- Views: 20246
Re: Christmas Puzzle?
I vote for the hydraulic bike brakes on the large wheels. Two master cylinders as per Ron's suggestion. I've used this on ultralight aircraft which are about the same weight as his setup. Maybe more. It's very mature technology. Works fine when wet as well. And amazingly light! The Sturmey Archer un...
- Sun Oct 31, 2021 9:53 pm
- Forum: Sales and Trade
- Topic: Dynamo/Gen Set
- Replies: 15
- Views: 17496
Re: Dynamo/Gen Set
I have the drawings for the Firefly gen set and it is the Sirius. No differences that I can see. It supplied 6V at around 4A to charge a small lead acid battery that powered a small morse code radio set for clandestine service. The boiler was an ordinary pressure cooker doubled in height. No condens...
- Mon Oct 25, 2021 2:42 pm
- Forum: Technical - non Engines and Boilers
- Topic: Wooden bearings
- Replies: 28
- Views: 19746
Re: Wooden bearings
Thanks Ken, As to things like acetal resins getting hot, heat is caused by friction. The coeffient of friction with materials like Delrin and Teflon is so startlingly low that hardly any heat is generated. A pumped oil bearing is the gold standard of low friction and zero starting force. The extreme...
- Sat Oct 23, 2021 2:38 am
- Forum: Technical - non Engines and Boilers
- Topic: Wooden bearings
- Replies: 28
- Views: 19746
Re: Wooden bearings
I've seen them in a number of applications. There is one thing in common with all of these successful uses. Low speeds and little resulting heat. All of the various wood treatments don't do much for thermal conductivity. As soon as there is much heat generated, things go downhill. The smoke gets out...
- Wed Oct 20, 2021 1:07 am
- Forum: Technical - Engines and Boilers
- Topic: bearing tolerances
- Replies: 12
- Views: 6480
Re: bearing tolerances
Don't tell anyone but I've been 'experimenting' for forty years with plastic wrist pin bearings on small Stuart engines up to and including the well known #5. I use Delrin (acetal resin) on a tool steel or S.S. pin (polished surface) with zero to less than zero clearances. It takes sharp cutters and...
- Mon Oct 18, 2021 7:45 am
- Forum: Technical - Engines and Boilers
- Topic: bearing tolerances
- Replies: 12
- Views: 6480
Re: bearing tolerances
A small knock? Only a small knock? What a lucky dog you are! Laughing aside, most of the knocks I've chased in small engines haven't been the big end. They've been reversing loads that don't include much rotation. A rotating journal spreads the lubricant around and at a surprisingly low r.p.m. devel...
- Tue Oct 12, 2021 11:54 pm
- Forum: Technical - Engines and Boilers
- Topic: Stainless steel tubes
- Replies: 30
- Views: 13057
Re: Stainless steel tubes
Hmm. They certainly would have the wall thickness to last forever! And strong enough. You might have to clean off any paint or such. Whether the extra wall thickness would be a thermal issue don't know. Fred and others with more technical experience and regulatory knowledge will chime in here for su...