Single cylinder horizontal enigne as test bed for multi cilinder engine design

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xander janssen

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Improved version with a depth stop for pressing in the cylinder head.

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xander janssen

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Gear are in place, as are the head and head gasket.

Still to do:
Tapered clamps for flywheels
Pushrod, rockerarm and exhaust cam
Ignition cam
Fuel tank
 

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xander janssen

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First tapered clamp in place. Even with only four M2 screws, the clamping force is impressive.

The extra 2 holes (one visible) are M3 for pushing the bushing out of the flywheel and release the clamping force.
20220914_090027.jpg
 

xander janssen

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Cam and push rod finished. Only have to add a rocker arm and ignition cam.

Compression looks to be sufficient but not so high that it is too hard to overcome.



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xander janssen

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Probably a dumb question but is there any way to make this sort of clamp that keeps the flywheel spokes in alignment, one to the other?? Easy with keys.

Not that I know. The advantage of these clamps over using a key is that you can fix the parts really well by pinning (gear to flywheel and cam to gear) while still allowing to set/adjust timing later by rotating the flywheel over the crank shaft.

The "disadvantage" is indeed that you need to align the 2nd flywheel one way or the other. However, this is only a seemingly disadvantage to me, as with a key, you have to cut the key ways in both flywheels in the same orientation. So also there an alignment is needed.

In the end, I will align them "by sight" which is sufficient for me as this is "only" a test-bed to test various engine parameters.
 

xander janssen

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Ignition cam finished.
20221004_203003.jpg


Heavily overdimensioned fixation lugs, but by that historically correct 😉

20221004_203024.jpg
 

xander janssen

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Got it running twice for about 30 seconds but then it stops. Does not run consistently and it sounds as if it has not enough fuel. Increasing irregular firing and then slowly dying.

Tried a rather small version of the "Ridders vapour carburetor".

Now looking for plans of a simple but consistent real carburetor. Does not have to be a throttling carburetor as I do not want to do "vroom vroom". A nice steady RPM is all I'm looking for.

 

xander janssen

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Adding more fuel in the "carburetor" improved things greatly.

Even got several minutes of consistent firing. Unfortunately no movie of that. This is 2nd best with an occasional misfire.




Not bad.
 

minh-thanh

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Hi !
Adding more fuel in the "carburetor" improved things greatly.

Even got several minutes of consistent firing. Unfortunately no movie of that. This is 2nd best with an occasional misfire.




Not bad.

Sometimes it's not the carburetor or ignition...it's the intake valve, sometimes it gets stuck a little bit, make it a bit smoother (a little w20 oil at the valve guide or make the guide valve a little smaller...) and will be fine
 

xander janssen

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Hi !

Sometimes it's not the carburetor or ignition...it's the intake valve, sometimes it gets stuck a little bit, make it a bit smoother (a little w20 oil at the valve guide or make the guide valve a little smaller...) and will be fine
Intake is a ball valve that is held close by gravity and opened by vacuum as per Jan Ridders design. It might be a bit too loose in the seat i.e. too much vertical space causing it to bounce. Is one of the risks of this type of valve as Jan Ridders also mentions. I can still adjust the free space, so that is next after optimizing exhaust and ignition timing.
 

minh-thanh

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Hi .
Congratulations !
And, next, how many cylinders will the engine have !? ;)
 

xander janssen

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Hi .
Congratulations !
And, next, how many cylinders will the engine have !? ;)
Hi,

At least 2 or 3 as I'm thinking of a replica of a VD engine of the Dutch "de industrie" brand from around the 1930-1940 era.

Apart from a few (~5) single cilinder prototypes, these were all 2, 3, 4, 5 and even 6 cilinder engines.

Here a nicely restored 2VD5 which might/will serve as example



Meanwhile building the horizontal single cylinder, I searched and found a lot of documentation and dwawings of this type of engine.

Dwarsdoorsnede-1.png
 

minh-thanh

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Hi !

Is that a diesel engine? If yes then I have an opinion - it's just my opinion of course and that's how I do it
Let's design and build a similar engine but with 1 cylinder
When you get it running, you play with it, test time and amount of fuel....everything...and as you get more experienced with diesel model engines and then you can design and build multi-cylinder diesel engines.
When I make a 2 or 4 stroke engine, with only compression, I'm sure it will run
But when I do diesel engine, even though I'm quite confident, but when I start making injectors, fuel pumps, ball valves, it almost goes beyond the limits of skill, experience...and patience mine
And honestly, my 4-cylinder diesel project is my dumbest project
 

xander janssen

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Hi !

Is that a diesel engine? If yes then I have an opinion - it's just my opinion of course and that's how I do it
Let's design and build a similar engine but with 1 cylinder
When you get it running, you play with it, test time and amount of fuel....everything...and as you get more experienced with diesel model engines and then you can design and build multi-cylinder diesel engines.
When I make a 2 or 4 stroke engine, with only compression, I'm sure it will run
But when I do diesel engine, even though I'm quite confident, but when I start making injectors, fuel pumps, ball valves, it almost goes beyond the limits of skill, experience...and patience mine
And honestly, my 4-cylinder diesel project is my dumbest project
It is indeed a 4 stroke Diesel engine, at least the real ones as build by De Industrie.

Since I'm by far competent of building the key components mentioned by you, let alone design them, I will build this engine as a 4 stroke petrol engine disguised as a Diesel.

For that, I will build spark plugs that mimic Diesel injectors and the carburetor(s) and distributor will be placed out of sight.
 

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