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Author Topic: M94 hit n miss Flywheel weight  (Read 286 times)

ShadetreeMotorcycle

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Re: M94 hit n miss Flywheel weight
« Reply #15 on: November 08, 2020, 01:10:28 pm »
One of the down sides of heavy flywheels on a tiny engine is not enough power on the "Hit" stroke to really get them moving...my engine has good compression I feel and I am running Zippo fuel...I have heard of adding a little Acetone in the Zippo fuel to encourage fuel to vaporize...Some spoke of only a few drops of Acetone...just curious how much would be to much...and what is the result of to much Acetone? I don't want to damage my cute little engine. It also occurred to me that I may want to dose my fuel Right before use....we have Acetone dispensers at work used to clean metal, they hold about a quart and if you fill one today and don't use it for 2 or 3 days it will be 3/4 empty from evaporation loss!...even Zippo lighters need to be filled every 3-4 days as Zippo fuel evaporates very well to....I am going to run out for some more engine tuning supply and thinking of picking up some of the small mason canning jars..they make small ones for jelly that may work to store my pre-mix fuel, I can break the seal and quickly grab a syringe full (plenty to play) of fuel and quickly recap mason jar in hopes my addatives stick around....just wondering how others are handling this?

tony1951

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Re: M94 hit n miss Flywheel weight
« Reply #16 on: November 08, 2020, 02:54:46 pm »
I run mine on ordinary petrol. It's cheap and runs perfectly unless I mis-adjust the mixer screw. Mine runs best with the screw just a touch more than a quarter of a turn open from being gently screwed in. If I am not mistaken the manufacturer tests them on ordinary petrol.

ShadetreeMotorcycle

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Re: M94 hit n miss Flywheel weight
« Reply #17 on: November 10, 2020, 07:55:46 pm »
Update: had a few min to play some more tonight!...I peeled the tape and added a Second row of weights, putting me up to 17oz of total weight added. It started just fine and ran a bit slower rpm but hit more often because every time you slow the engine the springs need to get softer as less centrifugal force in play....rather than make a new rubber spring....I decided to go BIG or go Home! Added a 3rd row for 27oz! The wheels are getting noticeable larger so they accepted 10 oz on this pass...I made a rubber spring that was quite slack and to my surprise the engine Started!....I am now average 34 to 36 hits per min...but the engine does a double hit about half the time...so if was a Strong hit it coasts quite well....on a double hit cycle the first hit is weak and so the Stronger second hit really gets the flywheels spinning...I am curious if I added a one way check valve in the fuel line if I would get more "strong" hits?...kinda wondering if during the longer coasts I am now getting if the fuel can creep back from the carb a bit...something more to test I guess.
   Think this is as far as I want to go with added weight, unless the check valve fixes the double hit issue. As always advice is Welcomed! I will be trying a deeply dished piston quite soon!

Jim

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Re: M94 hit n miss Flywheel weight
« Reply #18 on: November 10, 2020, 08:02:49 pm »
This guy (who I don't know) reached out to me on YT and told me to put a weaker exhaust spring in -

https://www.youtube.com/channel/UCItmn6Ly_MtMIY6MoceT75A
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Jim

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Jim

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Re: M94 hit n miss Flywheel weight
« Reply #19 on: November 10, 2020, 08:19:53 pm »
Hey mate, any chance of a video of your engine running with the added weights on the flywheels?
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Jim

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Nick

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Re: M94 hit n miss Flywheel weight
« Reply #20 on: November 10, 2020, 08:26:31 pm »
Hey mate, any chance of a video of your engine running with the added weights on the flywheels?

^^^ This right here  ;)
Nick

ShadetreeMotorcycle

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Re: M94 hit n miss Flywheel weight
« Reply #21 on: November 10, 2020, 08:39:19 pm »
I would Love to share a video of my engine running!....I have Never attached Anything but photos so far....I will consult with the computer guys at work and see if I can get a Video up later this week....I think it's awesome we can share experiments we have tried and the cumulative knowledge may advance the fun had by running these small engines ;D

Jim

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Re: M94 hit n miss Flywheel weight
« Reply #22 on: November 10, 2020, 09:02:13 pm »
Thanks it would be great to see your experimentation on video. Following along with great enthusiasm here, please keep us all up to date with what you're trying out.

Would you mind sharing your first name? Its nice to be able to address someone on a first name basis.
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Jim

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Jim

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Re: M94 hit n miss Flywheel weight
« Reply #23 on: November 10, 2020, 09:34:55 pm »
I'm using a urine specimen jar that I turned some ali up for to make it bottom heavy for my Zippo/oil mix.

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Jim

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ShadetreeMotorcycle

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Re: M94 hit n miss Flywheel weight
« Reply #24 on: November 11, 2020, 05:51:16 am »
Thanks it would be great to see your experimentation on video. Following along with great enthusiasm here, please keep us all up to date with what you're trying out.

Would you mind sharing your first name? Its nice to be able to address someone on a first name basis.

I don't mind sharing my name at all.....the name on my birth certificate is Benjamin and that is what my mom would call me when she "thinks" I have been naughty....lol...I was never as bad as mom likes to imagine...the guys at work often call me Big Ben as I am 6 ft 6 inches tall and North of 300lb
  Nowadays I mostly go by Ben.

Jim

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Re: M94 hit n miss Flywheel weight
« Reply #25 on: November 11, 2020, 02:59:57 pm »
Cheers Ben
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Jim

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St Paul Steam

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Re: M94 hit n miss Flywheel weight
« Reply #26 on: November 11, 2020, 03:57:38 pm »
Geez...I've seen many good/slow running H&M engines , but this one's got them all beat I believe,  I've never seen one of these run so much like the big ones, the way it winds down before it fires again.
Well done that 🙂👍
Bruce
St. Paul Indiana , USA

ShadetreeMotorcycle

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Re: M94 hit n miss Flywheel weight
« Reply #27 on: November 11, 2020, 05:33:46 pm »
Cheers Ben

Cheers Jim!...glad to have fellow enthusiasts to compare notes and ideas with....these are fun little engines and hopefully we will learn to make them even better! I really like the glass syringe you found and will have to Look for something similar over here.

ShadetreeMotorcycle

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Re: M94 hit n miss Flywheel weight
« Reply #28 on: November 11, 2020, 08:16:48 pm »
Geez...I've seen many good/slow running H&M engines , but this one's got them all beat I believe,  I've never seen one of these run so much like the big ones, the way it winds down before it fires again.
Well done that 🙂👍

The video posted earlier in this thread is not my engine ....but....one I am hopeful to match one day. I do not know exactly "what" was done to it but several have speculated it is well polished and Very Finely tuned plus most believe the compression has been reduced and possibly timing altered.

I put it in this thread as a goal to achieve, but I just wanted to clarify it is Not my work....I hope to get there one day!

70Rcode

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Re: M94 hit n miss Flywheel weight
« Reply #29 on: November 13, 2020, 07:31:20 am »
Hi Ben,...Yes, ...There's almost an addictive interest in trying to slow down the non-loaded rpm & hits per min but only so much can be achieved with flywheel/governor spring & weight mods & the stock firing hit "kick" indicates maybe too much stock compression exists..I ran some engine impulse power output to compression ratio flywheel inertia math numbers & it seems by significantly Reducing the Compression Ratio may be the Key modification to reach the ultimate Low rpm/hits per min goal..Since the sparkplug-cylinder head runs way to cold (even without water) anyway, I'm considering reducing the C/R by using 1/16--1/8" thickness rubber cyl head gasket spacer/thermal isolator to produce a hotter running cyl head cleaner combustion + slower running results...Happy motoring,...tom.

 

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