32x40 H Gas engine

Brian40 · Oct 20, 2014

Time had come to think about the valve seats, first of all it was necessary to spot face the area that the seat was to to be to get an even surface, I did not have a end mill of the correct size to do the job so i improvised by making a mandrel that fitted the bore of the valve access port the ground down a Dremel silting wheel to fit the end, the result was a perfect spot face.
this led me to think that a similar approach could be taken to the seats, so a similar mandrel was made with a 90° cutter fitted in the end ,this resulted in a perfect narrow 45° seat, it will be interesting to see how this seals when the time comes.
Sorry the pics are not to good my baby camera finds this a bit hard.

Brian

Brian40 · Oct 22, 2014

Returning to the barrel the next job was to shape the rocker supports.
so it was on to the mill and cut the slots, then fit my very poor quality angle vice and shape the angles.

Slowly slowly Brian.

Brian40 · Oct 24, 2014

The valves are turned from stainless steel of unknown type so it will be interesting to see how they perform.
Having got the valves done I threaded the access holes, spot faced the area to take the washer and made the threaded plugs.
Brian.

Brian40 · Oct 26, 2014

Building the crank case was a job I was not looking forward to I t is held together with 22 screws, that's 44 holes to be drilled that all have to line up.
So I decided to trust the I gauges on the mill totally, No marking out just find the edges with the finder and use the X Y. It worked a treat who needs CNC.
The orange tube is to test the alignment.

Brian40 · Oct 28, 2014

Having started on the alloy plate the next part was the connecting rod. the cap material was sawn off then squared and replaced prior to boring the hole for the bearing.
the small end was rounded using the rotary table and the shoulders of the big end shaped with the boring head then the sides where milled to size.
Nearly up to date with the back log of work.

Brian

Brian40 · Oct 30, 2014

One of the pieces trimmed off to make the rod just happened to be the right size for the blank for one of the timing gears. so I made a quick cutter and set about getting the job done I set up the mating pairs on the depthing tool that I use for clock gears to prove the mesh, all ran as smooth as silk.

Brian.

Brian40 · Nov 4, 2014

While I am waiting for the material for the crank to arrive I have been working on a jig to determine the cam angle for the correct valve timing when using a roller follower. before I commit to making the camshaft proper.

Brian.

Brian40 · Nov 5, 2014

Just 3°on the cam angle and 2mm on the roller diameter and I have the settings I want.

Brian.

Brian Rupnow · Nov 28, 2014

Brian40--What is happening with this very interesting build. I keep checking for updates.--Brian

jj-smith · Nov 28, 2014

GailInNM said:
Brian,
I know the feeling about posting into empty space. But, although you don't have many replies there are a bunch of us following along. You have over 2500 views on this thread. I should have posted earlier but because of a medical problem typing has been difficult for a few months so mostly I have just been reading the posts.

If you have seen any of my threads on opposed piston engines you know that I like to model things that are out of the ordinary. It's a lot more fun to make something new from some crazy idea in your head, and inspiration can come from so many things that have been tried in the past and never really caught on.

Keep it up

Gail in NM

Howdy folks

I'm reading this and liking it too.
I'll follow along behind the scenes, and I agree with Gail's statement to like things out of the ordinairy or just plain done my way!

It sure looks interesting sofar,

Regards, J.

jj-smith · Nov 28, 2014

Just my luck Brian,

Finally have something really interesting to follow but now I wonder.

I hope everything is OK B40.

Cheers, J.

Brian40 · Dec 1, 2014

Hi all sorry to have disappeared for a while but I have been waiting for material and have had guests.
Also on my return I find my posts reduced to thumbnails . I am not a Happy Camper??

However after my last post I made the wheel to carry the ignition timing magnet it matches the cam shaft gear and fits on the opposite end of the cam the pair have now been crossed out in a 5 spoke pattern, this will eventually be carried thro to the flywheels.

Brian.

Brian Rupnow · Dec 1, 2014

Glad you are back. Your posts are not showing up as thumbnails on my computer. They show up full (correct) size, Maybe it's a setting on your computer?---Brian

Brian40 · Dec 1, 2014

That's strange they have reverted to full size on mine to.
Thanks for the input Brian what with the ad's and small photo's I was wondering if it was worth posting at all.
Started on the blanks for the crank today. picks to follow.

Brian.

Swifty · Dec 1, 2014

For a short while there was a problem with the photo's being thumbnails or just links, but as you see that has been rectified. As far as ads go, I never see any, are you logged in correctly? I believe that if you check out the forum without being logged in, you will see the ads.

Paul.

Brian40 · Dec 1, 2014

Thanks Swifty after I logged in to answer Brian R, everything reverted to normal.
Brian.

Brian40 · Dec 9, 2014

At last the materials arrived so I immediately started on the crank shaft, the main shaft was turned between centres to keep things nice and straight.
then the web blanks where turned to size in the lathe and a undersize hole drilled in the centre. then transferred to the mill and the hole bored out the using the DRO the it was offset to bore the hole fore the big end pin ( no marking out required )

I am now starting on the flywheels, so I have all the parts that go on the main shaft, and can see if I have dropped any clangers. before threading the shaft ends.
Brian.

Brian40 · Dec 14, 2014

So I have a 5" diameter chunk of steel that will not fit on my 7x12 so it's of to the mill to hack out a channel for the chuck to get a grip on.
Then on to the lathe to turn the blanks, the blank was then centred on the rotary table to drill the holes at the corners of the spokes. having done this it mas a simple game of join the dot's to end up with two flywheels

One day I am going to learn how to get the photos in-between the captions, ONE day.

Brian Rupnow · Dec 15, 2014

Looking very good. I am quite excited to see this coming together.---Brian

Brian40 · Dec 16, 2014

Just had to try the crank in position to see if all is OK
Then started on the big end. splitting the bronze in half the soldering it back together, and finally turning down the OD and boring the ID, had to use the boring head as it was the only tool I had small enough.
more tomorrow.

Brian.

32x40 H Gas engine

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