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

ShadetreeMotorcycle

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M94 hit n miss Flywheel weight
« on: November 07, 2020, 06:36:41 pm »
My new M94 is here and I have begin to tinker! I want to try more Flywheel weight,....but would like to see the results before turning heavy "tires"....I don't mind making the "tires" but would like an educational guess on just how much More weight might be desirable...I found some Lead tape online, it's common use is to weight tune golf clubs, that might be a more elegant route...but I can not wait to test!... So...my local harbour freight has tire weights for decent price...the adhesive is pretty good, and I washed the flywheels with rubbing alcohol for best bond...but these are designed to go Inside rims where centrifugal force would help them stay in place. In my situation centrifugal force will cause them to want to fly off...specialy after the engine starts slinging oil all about....I don't want to run these very long...just a test...thinking of binding them with carefully applied painters tape, it has a bit of stretch and I am hopeful with the stretching and several layers it will all hold together for a test run!
The engine shipped quite dry...if I hold the exhaust valve open and give it a hand flick it only spins about 3 times around...the tire weights add 8.5oz total...the same hand flick now gives me about 9 times around before stopping, so 8.5 oz should be a noticeable difference! To be continued....

Warning: Tampering with engines can be dangerous! I in no way endorse or encourage activitys in this thread...for informational and entertainment value only! :o

ShadetreeMotorcycle

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Re: M94 hit n miss Flywheel weight
« Reply #1 on: November 07, 2020, 07:41:23 pm »
Got the tape bound on And the Soft springs from carbon brushes installed...getting ready to test fire but Thought to take a photo before unless it does not go well, there will be record of what not to do....wish me luck!

Nick

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Re: M94 hit n miss Flywheel weight
« Reply #2 on: November 07, 2020, 07:42:31 pm »
I’m really looking forward to your results, will there be a video?
Nick

ShadetreeMotorcycle

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Re: M94 hit n miss Flywheel weight
« Reply #3 on: November 07, 2020, 07:47:16 pm »
I do Not have a YouTube account...but my cell phone will take video...can I attach a cell phone video?...I have never tryed, but want to learn how!

Nick

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Re: M94 hit n miss Flywheel weight
« Reply #4 on: November 07, 2020, 07:52:32 pm »
YouTube has always been the best/easiest way to put videos onto forums. If you need help, let us know... I assume you’re using a smart phone?

At least get a video of tonight’s test run onto your phone and we can help you get the video uploaded later. I’m very interested in seeing it.
Nick

Nick

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Re: M94 hit n miss Flywheel weight
« Reply #5 on: November 07, 2020, 07:53:00 pm »
And if they weights start flying off, keep recording!
Nick

RedRyder

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Re: M94 hit n miss Flywheel weight
« Reply #6 on: November 07, 2020, 08:06:24 pm »
Yes, please record this.
And..... if you have access to another person with a smart phone, have them record in slow motion in case the weights fly off. You want to catch that. That said, i don't think you will lose them with the tape wrap.

Gil

Adirondack Jack

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Re: M94 hit n miss Flywheel weight
« Reply #7 on: November 07, 2020, 09:06:37 pm »
If you find this idea worthy, someone with a lathe could make replacements for the existing steel rims that are a tad bigger around, perhaps a shade wider as well, to add flywheel weight.  The existing steel rims press off easily with a puller if they won’t come free by hand.

ShadetreeMotorcycle

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Re: M94 hit n miss Flywheel weight
« Reply #8 on: November 07, 2020, 09:32:42 pm »
Great News....She held together Just fine!....So in my eagerness to tinker...I never even bothered to to test fire my shiny new engine stock...there was a brief learning curve...first the fuel tank would only except about 2 thimble fills of fuel then an air bubble formed and could get no more fuel in....tryed to start and got pops right away but was sucking air ...probed the tank bubble with tooth pick and now she accept fuel!....a full tank cured my air bubbles....now trying to find best carb setting....she will run from 15% open to 45% open...but so far best running is about 25% open ...just as instructions direct.
   The result of the weight is much slower run....I would guess approx 1/3 the speed of stock....the side affect of this is even though my springs are softer....the rpm is still so low that the weights will not fling open hardly 1/16 inch....in videos I have watched each weight can move outward apox 1/4 inch...So my next move will be to wind some super soft guitar string custom springs and/or make more heavy governor weights....I am going to go back and try just unhook one spring to see if I can get it to miss more just for a test...but want to take the weights to work and ream 2 tiny dowel pins to accept a single spring...I think I am on the right track...but it will be a much more soft spring set up with the lower RPM. The low rpm was no issue for tape to hold weights in place...so when I get my set up dialed I will report!

Nick

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Re: M94 hit n miss Flywheel weight
« Reply #9 on: November 07, 2020, 09:37:15 pm »
Great News! Hopefully you get others trying this out too... @Jim get your engine back out  ;)
Nick

ShadetreeMotorcycle

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Re: M94 hit n miss Flywheel weight
« Reply #10 on: November 07, 2020, 10:08:03 pm »
One thing I forgot to mention...I thought the new engine was very dry...all I have on hand for lube is MM-oil and clock oil...I put MM-oil everywhere I could think of including the piston skirt...ran the engine about 5 min and it has now really free up considerable, I now can hold the exhaust valve open and a stout flick will give me about 19 revolutions with the extra weight....but I wondered what folks like to lube there china engines with in the non combustion areas??
   Also...I only added a few drops of MM-oil to the Zippo fuel...I can Barely see a tint of pink...do I need more?

Stoker

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Re: M94 hit n miss Flywheel weight
« Reply #11 on: November 07, 2020, 11:42:37 pm »
You probably don't really need more oil in your fuel mix as it doesn't really burn away and tends to hang around in the cylinder for quite a while I find. As for the other lubrication points, I think most any fairly light machine oil should work fine. I use 3 in 1 (20 wt) with occasional applications of PCL (Breakfree) just to keep the older applications of used oil from getting gummy over time.

Great experiments you have going, and like others I look forward to your eventual conclusions and possibly a video!
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ShadetreeMotorcycle

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Re: M94 hit n miss Flywheel weight
« Reply #12 on: November 08, 2020, 12:26:46 am »
Well...did a bit more experimental tinkering...I had cut my carbon brush springs in half to get a useable length and now they have to few coils so they stack force to fast...its to late at night to come up with a .010 music wire guitar string...So...looking around For Something suitable I tried some rubber from my rubber band contest model airplanes!... It's much higher quality than an office rubber band and Bingo....my engine was running again! It's not a long term solution as rubber will degrade when in contact with petroleum products...and...it does not look to authentic...but I was happy to have my engine making putt-putt noises and my weights where finally moving like I see them on other run videos!....I am now playing with carb adjustments and the best run I could get tonight was 47-48 hits per min...so I am not really Slower than what others have achieved on the forum....but...it seems to be happening at a little lower RPM. My rubber called Tan Super Sport comes in 25ft length...I have to make a knot and make different size loops to make my rubber spring softer or stronger. I made a loop only 3/16 longer and the engine would not run...to soft...I need to find a way to have greater control almost like a screw adjustment on my tension. I have a fancy rubber splitter so tomorrow I will experiment with thinner rubber bands. I also need to make a solid engine base very soon...i feel with the engine jumping around when it hits prevents me from getting 100% of the power pulse into the flywheels...also the better base may help me tune for better carb setting.
   Part of me wants to go ahead and make a dished piston, I feel I could get the flywheels to coast down a bit more slowly and still carry me thru compression and keep running...but at the cost of a weaker power pulse...I freely admit I do not know enough about hit and miss to know what the best route is....I Did see a engine on YouTube...the owner said it weight was 2500 lb and he won a contest...he had it hitting only 2 times per min! I kept thinking it was no longer running then sure enough...it would hit!
  So...my little engine sure is fun, I feel sure if I keep at it I can get a slower result....please chime in...I would like to know if the general population thinks lower compression would get me running less hits per min With the heavy flywheels combo?

I am enclose a photo of my crude but soft rubber spring
   

ShadetreeMotorcycle

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Re: M94 hit n miss Flywheel weight
« Reply #13 on: November 08, 2020, 12:58:27 am »
By my count this guy is down to approx 16 hits per min....he is kicking my butt....

https://youtu.be/ee76fu_bENc

Nick

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Re: M94 hit n miss Flywheel weight
« Reply #14 on: November 08, 2020, 08:13:15 am »
Wow! That one in the video is running perfect  8)
Nick

 

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