Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

I just got this new Enjomor model. I got it running by using a starter pulley/rope pilfered from one of my Eachine models. It is a hit and miss, but it hits many times and revs up before it starts to miss. This is mainly due to the governor, mounted on the camshaft, which runs at 1/2 the flywheel speed. Adjusting the mixture dosent make much difference. After changing the timing from 0° to 18° btdc and moving the latch out arm closer to the exhaust pushrod, it will hit-miss cycle around 16 times a minute. Observations:

-great looking model
-flywheels and spokes are made of stainless steel
-flywheels are held on to crankshaft with 4 bolt clamps; no grub screws
-oil cups for cylinder and main bearings
-main bearings are bronze bushings with “4 bolt” caps
-mechanical points ignition that triggers a 3 AA battery electronic module
-pushrod has no roller; runs directly on cam
-gov. weights have no springs; tension is by latch-out arm spring (increasing wear on collar)
-muffler has 2 of the 4 holes plugged; may decrease power?
-valves and valve seat/guides are brass in an Al cylinder head.
-governor runs at 1/2 engine speed, reducing its sensitivity

From the factory it has a very different “hits & misses” operation, see video. It will be interesting to see if anyone can get it to just hit once like most other h&m engines. Or just enjoy its unique operation.

video:

https://youtu.be/g5X5lq-iOVw

It will likely improve the firing cycle if you clamp it to something rock solid.

It is a pretty neat looking miniature copy of the 1 1/2 hp Olds hit and miss engine.

I plan to order one after we are firmly planted in the new Office of Steam. This is moving time!

Here is a video of a former resident at the Office of Steam....

A 1/2 scale model of the Olds 1.5 hp. (I believe the new miniature may have the same governor set up and is capable of running slower and should be fun to dial it in)

Gil

https://youtu.be/0Le4-hKfPVM

The governor is much like the original it was modeled after but without adjustments.

You may be able to work around this by using a softer spring on the latch-out lever.

This one still "Hits" more then 1 time, but it seems like it runs a bit slower and better than the others I have seen. I think there is potential for improvement here.


https://youtu.be/6rux8ezS_0E

One other thing I noticed is that the crank/flywheel assembly is not balanced. I will try to balance it, at least statically, by drilling some holes in the side of the flywheels, similar to what is done in full scale engines. This should smooth it out, at least the up and down motion.
Also will try to get the power of the hits higher with more dialing in and running time.

The guy from the first video reported more power after he hand lapped the valves in, if you go to his channel there is a how to video on this exact engine. His method is quite simple and easy thing to do. I believe he used "whitening formula" toothpaste for lapping compound, there is a mild abrasive in this kind of toothpaste and cleans up well with warm water.

Quote from: RedRyder on January 20, 2022, 09:06:57 am

The governor is much like the original it was modeled after but without adjustments.

You may be able to work around this by using a softer spring on the latch-out lever.

I think Gil has hit the nail on the head, I found this video on YouTube and you will see the owner has to put his finger on the latch out arm to even Get his engine to miss! His finger pressure is effectively cancelling out "some" of the the "to strong" spring effect.
  What I like about this video is the guy is very familiar with the previous model we all know and love, He makes Several attempts to stall his new engine when he see it is not properly missing and says "Wow, this has a LOT more power than the older model!

The 1/2 governor speed is not helping, so larger more heavy governor weights would help, there may not be clearance room for larger weights so polish all moving contact parts to reduce friction in the governor may help a little.
I would go as light as you can on the return spring, possibly even wind your own spring out of a thin guitar spring.
  When you mount the engine Very secure so it can not rock, when the engine fires, it puts "More" of its energy into spinning the flywheels so it is more efficient at getting them up to speed. The engine hitting several/many times before the governor finally does its job is a symptom of the overly strong spring.

It looks like they got several other things right on this engine, I might enjoy tuning on it if I can find one priced well!

https://youtu.be/WBdKBCYli-o

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Great minds think alike! Polishing the friction surfaces on the weights and gear was my other thought.

I also would like to order one of these after we get settled with our move.

Gil

The best price (I) have seen currently on this engine is $349 with and 8-10% coupon brings the total to aprox $315 shipped. I don't think this is bad for what you get....but confess I have (3) of the previous version's all purchased for about 1/2 this amount (pre Covid)
  I don't "need" a 4th engine, but like the style and upgrades and method of holding flywheels on. I have not ordered much since Covid price spikes, if anyone knows of a vendor with a bit better pricing? I would be Greatful to learn of them! Thanx

Bonjour,
I like Hit & Miss engines and bought several to Mirocosm. I am not a mechanic and prefer buying an engine Ready To Run.

This one would interest me but on the videos shared in this topic; it seems not "Missing" and running very fast.

Do you think it a recurring problem in the design of the governor in particular ?