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: RedRyder on December 14, 2020, 07:56:27 pm

Title: Re: Tuned an M90 Hit & Miss Gas Engine Engine for a Friend
Post by: Jim on December 16, 2020, 06:40:23 pm
If you weren't so far away Gil.....I'd be sending all of mine to you for a tune up :)
Title: Re: Tuned an M90 Hit & Miss Gas Engine Engine for a Friend
Post by: RedRyder on December 16, 2020, 06:18:30 pm
Here is another short video.

It fires 8 times over 20 seconds which is 24 times per minute!

Enjoy,

Gil

https://youtu.be/68AsMJyzWfQ
Title: Re: Tuned an M90 Hit & Miss Gas Engine Engine for a Friend
Post by: St Paul Steam on December 15, 2020, 03:38:00 pm
It is firing 28 times per minute and freewheeling 32-34 revolutions between firing.
I did all the stuff I published before on other M90's.
Only difference is this one had only one O-ring from the factory.
I did switch the O-ring as the original had lost some elasticity.

Yes Gil, I well know you have presented all of these wonderful mods before, but I was thinking of making a simple 1,2,3,4,... type listing that could then be made a locked sticky at the top of one of the appropriate Boards, for all to easily access without having to search and wade through different Boards and long Threads. Perhaps even make the list in the order of best effect achieved, or maybe of easiest mods to do first etc.

Just a thought ...
Nice work Gil
I like your idea Daniel , it would be nice to have a go to "sticky" thread for enthusiasts to consult to. Per the degree of their ability.
Title: Re: Tuned an M90 Hit & Miss Gas Engine Engine for a Friend
Post by: Stoker on December 15, 2020, 12:11:42 pm
It is firing 28 times per minute and freewheeling 32-34 revolutions between firing.
I did all the stuff I published before on other M90's.
Only difference is this one had only one O-ring from the factory.
I did switch the O-ring as the original had lost some elasticity.

Yes Gil, I well know you have presented all of these wonderful mods before, but I was thinking of making a simple 1,2,3,4,... type listing that could then be made a locked sticky at the top of one of the appropriate Boards, for all to easily access without having to search and wade through different Boards and long Threads. Perhaps even make the list in the order of best effect achieved, or maybe of easiest mods to do first etc.

Just a thought ...
Title: Re: Tuned an M90 Hit & Miss Gas Engine Engine for a Friend
Post by: Nick on December 15, 2020, 07:57:32 am
Very nice runner now  8)
Title: Re: Tuned an M90 Hit & Miss Gas Engine Engine for a Friend
Post by: RedRyder on December 15, 2020, 06:43:54 am
It is firing 28 times per minute and freewheeling 32-34 revolutions between firing.
I did all the stuff I published before on other M90's.
Only difference is this one had only one O-ring from the factory.
I did switch the O-ring as the original had lost some elasticity.
Title: Re: Tuned an M90 Hit & Miss Gas Engine Engine for a Friend
Post by: Stoker on December 14, 2020, 11:38:53 pm
Most Excellent Gil !!!

So I get that as firing about every other second (~30 hits/min) and spinning out about 30 revs per hit as well.

Now that you have sooooooooo much experience at tuning these little puppies, how about a check list of things that you did to get this one where it now is ..... which is FANTASTIC!?!?
Title: Tuned an M90 Hit & Miss Gas Engine Engine for a Friend
Post by: RedRyder on December 14, 2020, 07:56:27 pm
Tuned an M90 Hit & Miss Gas Engine Engine for a Friend



https://youtu.be/E3bJSgg-l6s