32x40 H Gas engine

[Brian40]

As I am a new member on this forum forgive me if I get things wrong.
This engine is to be a scratch build and I am in the process of doing some doodles for the basic layout. this is going to be a long haul.
Brian.

 

[Brian40]

Well that's the doodling done, now I have to find 60x60 iron bar in Europe, at the right price.

Brian.

 

[Brian40]

The order for the material is in , now just waiting on the postman.
The working drawing for the barrel is done.
Brian

 

[Brian40]

The first bits of iron have arrived
It's time to start making chips.
brian.

 

[Brian40]

The first machining operation was to square up the material for the head.
As I do not have a reliable mill vice the dividing head was pressed into service as an angle block, with the 3-2-1- blocks as back up to get things square, this made a good set up keeping the job near to the table, and lowering the mill head , so keeping flex to the minimum.
The next job was to cut away the lower part of the embryo cylinder head, to bring it to a point where the real work can begin
So we are on the way.
Brian.

 

[Brian40]

the piston and liner blanks have now have now been bought to near size.
the piston is now mounted on a arbor for finishing the external size but this will wait until the liner is finished and in turn this must wait until the barrel is done.

Unfortunately the material for the barrel has a casting flaw so I am waiting for a new bit in the post.

While waiting for the post again i have done the valve timing diagram ,just another bit out of the way.
Brian.

 

[Brian40]

New material arrived yesterday, so i am up to my ankles in chips,making up for lost time roughing out the cylinder blank.
photos tomorrow if i can find the time.
Brian.

 

[Brian40]

Barrel coming along nicely.

 

[Brian40]

Moving on , the barrel now has the water jacket bored and the liner flange recess put in .
The lump on the top is going to be the rocker arm pivot
The 10mm alloy plate has arrived for the crank case. the problem is the sailing season is starting and I move onto the boat for the summer. so progress will slow down for a few months.
Brian H .

 

[gus]

Hi Brian.

Will follow your posts. I am about to get started on the Nemett-Lynx Engine. Materials arrved last week.

 

[Brian40]

Hi Gus.
I look forward to seeing you build the Lynx, after reading your H&M build, I am sure it will be very interesting.
Today I managed to turn the O D of the liner to fit the barrel, it's a slip fit sealing will be by a paper gasket under the flange that will raise the flange just enough to get a good seal on the head gasket, the lower end will be sealed by a "o" ring trapped between the barrel and the crank case,and nipping the liner. I haven't decided
whether to make the "o" ring groove a 45° bevel or a square I will ponder the problem.
Brian.

 

[Brian40]

Next job was to fit the front plate that will also nip the "o" ring that will seal the barrel to the liner.
Brian.

 

[Brian40]

Fitted the head blank by transfer drilling the barrel. This now gives me the threads in the barrel that I need to fix the liner in place without the head. so I can finish bore the liner on the mill.

Brian

 

[Brian40]

Hi all
Sorry for not keeping up to date but I have been on the boat most of the time and trying to get in workshop time when I'am at home .Just working my way through my postings.
A lot of progress has been made , head --valves -- cylinder--crank case-- ETC I will post more pics Soon

http://www.homemodelenginemachinist.com/attachment.php?attachmentid=72561&stc=1&d=1413624681

 

[GailInNM]

Your engine is coming along nicely Brian.
I will be interested to see how your valve arrangement works out. It islll an unusual arrangement from most model gas engines and I like that. Sure looks like it will work fine.
Gail in NM

 

[Brian40]

That was the whole idea Gail I think as we go along you will find a few other things done a little differently.

Thanks for your interest, Sometimes I feel I am doing this Just for myself??

Brian.

 

[GailInNM]

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

 

[Brian40]

Picking up from the point where i was about to bore the liner.I clamped it in the block to ensure it was all in line then used the boring head on the mill.

The piston blank was then bought to size and lapped to the liner.

More tomorrow. Brian.

 

[Brian Rupnow]

Nice work Brian. It is a very interesting engine, and I hadn't noticed this thread before, but I have been very busy with things of my own. Will follow your build now and possibly learn something.---Brian Rupnow

 

[Brian40]

The holes for the valve guides-- ports and the access plugs that allow the valves to be fitted, all have to be in line so they were drilled at the same setting starting with the smallest, this was the first real work on the head.
Next job was to mill out the combustion chamber to meet the ports on the top and the plugs at the bottom. clenched bu--- time.. and then drill the 90° ports to connect up .



Brian