T head engine by Brian

[A.K. Boomer]

me likee --- spent last night imagining ways to do it with one cam. I do want to get into the engine building scene

NCF that was my first thought also - and it would be easily accomplished with just offsetting a single cam and canting the valves, but this is really as basic as it gets even though there's two cams and keep in mind with two cams Bri can then fiddle with retarding the intake and advancing the exhaust for higher RPM's power curves :-)

after sorting through this thread - this is going to be a great build - this engine is really shaping up and has a very good look to it, Brain you really can "crank them out" but quality on this one is already starting to shine through... keep it going she's a keeper...

[brian Rupnow]

Today I built the cylinder head for my engine. I still have to put the slots in the cylinder head and plate right below it to make cooling fins. The only aluminum part left to build now is the gas tank mount. So, I basically have a whole engine here in six parts. Tomorrow I hope to cut the cooling fins and make the gas tank mount, then it will be on to mechanical things.

[nickel-city-fab]

NCF that was my first thought also - and it would be easily accomplished with just offsetting a single cam and canting the valves, but this is really as basic as it gets even though there's two cams and keep in mind with two cams Bri can then fiddle with retarding the intake and advancing the exhaust for higher RPM's power curves :-)

You too?? I was thinking, a bell-crank arm with wiper followers, keeping the valves in their current position. Cam lobes ride on one end of the arm. The kind of thing they used to do on natural gas engines in the late 1800's when they were still using hammer igniters.

[A.K. Boomer]

You too?? I was thinking, a bell-crank arm with wiper followers, keeping the valves in their current position. Cam lobes ride on one end of the arm. The kind of thing they used to do on natural gas engines in the late 1800's when they were still using hammer igniters.

Id need a diagram of what your describing --- but point being lets not take away from this totally "direct" approach of what Bri's already doing, this thing really is shaping up to be one of his best builds... I like it Bri keep keeping on man... this is what this site is all about exceptin Bri gets things done at an incredible rate compared to most of us lol

[brian Rupnow]

We now have "fins" in the cylinder heads. They were cut in using a 0.094" slitting saw. I have to go now and introduce myself to Mr. Lawnmower and Mrs. Whippersnipper. My yard is starting to get a bit jungly with all the rain we've been having.

[brian Rupnow]

Today I went to see my nut and bolt guys, and replenished some shcs that I was getting low on. Also bought the two shoulder bolts that will support the cam gears. Found time to make a gas tank mount. Now all of the aluminum parts of the engine main body are finished. Tomorrow I may dive into the mechanical parts.---Brian

[rdfeil]

Brian your skill and attention to detail just amazes me. In a week and a half you have gone from an idea to an outstanding example of machine work with a very appealing visual draw. I can't wait for the mechanical bits and pieces to add shine and polish to the project!!! When your engines run it must be a great feeling of accomplishment! Watching and drooling 🤓!

[PStechPaul]

Brian, what about using one of your engines to make a small lawnmower? You could justify your shop time with SWMBO by saying it's necessary for keeping the lawn in shape!

[brian Rupnow]

Paul--My engines are too small to run a lawnmower. Besides, I have a 20 hp. riding mower/tractor that gets that job done.---Brian

[brian Rupnow]

Here I am, waling away on a piece of 2 1/2" diameter hot rolled to make the 50 tooth gears from. The o.d. of those gears is 2.166" x 1/4" thick plus 7/8" diameter hub on one side.

[brian Rupnow]

Got up nice and early this morning and cut both 50 tooth gears. Everything worked out nice, no extra teeth. Maybe I'll do the 25 teeth gears tomorrow. It has been a lovely day here, had a family birthday party for my daughter and I out in my backyard. There are twelve of us now in the family. I'm the oldest at 75, Davy's the youngest at 1 1/2 years.

[brian Rupnow]

Holy Gas Tank, Batman---Were going to try something a little different. I've made about two dozen gas tanks. Many had the end plates silver soldered in place. A roll of silver solder costs about $100 here. Then I found out that I can J.B. Weld the endplates in and they never leak, but you have to be aware of your construction procedure and have any other soldering or welding finished before you use the J.B. Weld. Tomorrow, I am going to Tig weld the endplates into this tank. Of course there will be a bit of prep work first, probably a counterbore in each end of the pipe, and endplates made with a decent chamfer for the weld to fill. I'll let you know how that turns out.

[A.K. Boomer]

Brain make sure the tanks clean from fuel and oil before welding and for gods sake don't wear flip flops and a bathing suit lol

cannot believe your progress - you make all of us look like a bunch of slackers...

[Captain K]

I made the tank for my Rupnow vertical the way you describe. Counter bore tube with chamfer, Chamfer edge of end cap. Tig weld, machine flat again, add chamfer to the edge. Turned out nice.

[Dan Dubeau]

Nice looking engine Brian.