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

The Regular Stuff: Chat, Buy, Sell, Off Topic, etc. => General Discussion - Scale Model Gas Engines - Hit & Miss - Throttle Governed - Non-Compression – etc => Topic started by: Jim on January 09, 2021, 10:44:55 pm

Title: Re: M91 Model Hit & Miss Engine (Eachine ETX Vertical Water Cooled)
Post by: Jim on January 10, 2021, 04:26:43 pm

Really enjoying my foray into these hit & miss engines.

Title: Re: M91 Model Hit & Miss Engine (Eachine ETX Vertical Water Cooled)
Post by: Adirondack Jack on January 10, 2021, 01:59:15 pm

They’re the same. That said, somebody correct me if I’m not thinking this through properly, but if for some reason, one wanted to reverse the running direction of the M91, it would seem all that would be necessary would be to loosen the set screw and adjust the cam timing by ninety degrees of crank rotation, so the exhaust valve is open on the other side of top dead center, and spin it the other way. With only the single valve operated by the cam, and the intake valve suction operated, I would think that is all that would be required aside from cutting a reverse angled notch in the starter pulley to grab a rope wound the other way, or flipping the pulley over.

Title: Re: M91 Model Hit & Miss Engine (Eachine ETX Vertical Water Cooled)
Post by: RedRyder on January 10, 2021, 10:07:59 am

Hi Raphael. Jim's is the same as yours. You are looking at his on the rope starting pulley side which goes counter clockwise, same as yours. 
It is clockwise when we look at the governor weights.

Title: Re: M91 Model Hit & Miss Engine (Eachine ETX Vertical Water Cooled)
Post by: Raphael on January 10, 2021, 09:41:45 am

Bonjour Gil,
You are right for mine, but in this case, Kim's one starts anticlockwise on governor side, this is why I posted my video  ;)

Title: Re: M91 Model Hit & Miss Engine (Eachine ETX Vertical Water Cooled)
Post by: RedRyder on January 10, 2021, 07:23:29 am

Hi Raphael, Bonjour, Jim's engine starts clockwise like yours if you were looking at it from the governor side.

Title: Re: M91 Model Hit & Miss Engine (Eachine ETX Vertical Water Cooled)
Post by: Raphael on January 10, 2021, 04:52:30 am

Bonjour Jim,
Your M91 runs quite well a,d, funny thing it starts anticlockwise when mine is clockwise. I say this because your one is also a Jin's machine, even if sold by someone else on Internet ;)
The main difference is I was the third of ten people who pre ordered one direcly to Jin. 
https://www.youtube.com/watch?v=Ynns8w7lBYY

Title: M91 Model Hit & Miss Engine (Eachine ETX Vertical Water Cooled)
Post by: Jim on January 09, 2021, 10:44:55 pm

Running the newly purchased M91 Model Hit & Miss Engine (Eachine ETX Vertical Water Cooled) -


https://youtu.be/SmkTwrJ_UlU