Author Topic: Use drill to start hit and miss emachine engine  (Read 314 times)

njrich50

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Use drill to start hit and miss emachine engine
« on: August 24, 2019, 12:47:35 pm »
Can some one give me a idea how to adapt a drill to start the HORIZONTAL HIT AND MISS COMPLETE ENGINE ? I saw a video where Jin uses a 1/4 drill drill to start his vertical hit and miss.


Thanks.............

Raphael

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Re: Use drill to start hit and miss emachine engine
« Reply #1 on: August 24, 2019, 02:08:28 pm »
Bonjour,
I successfully rolled a thickness of 2 mm of rubber at the end of the axis of the engine and then tightened it with the chuck of my hand drill. Bad luck, it was perfectly running but on the wrong way, my old drill has no reverse mode.
Raphaël
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txlabman

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Re: Use drill to start hit and miss emachine engine
« Reply #2 on: August 25, 2019, 03:23:56 am »
Someone should ask Jin how he made his?

Gil May know the best way to contact him.

SlowArrow

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Re: Use drill to start hit and miss emachine engine
« Reply #3 on: August 25, 2019, 07:19:44 pm »
It looks to me that Jin took a u joint for a boats line shaft (he sells them) and disassembled it. It would be one of these below, but drilled for an 8mm shaft.

http://www.microcosm-engine.com/5mm4mm-universal-joint-couplings-p-195.html
Mike

Weedensteam

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Re: Use drill to start hit and miss emachine engine
« Reply #4 on: August 25, 2019, 11:35:02 pm »
You need an overrun mechanism, the drill engages to turn the engine and once it starts the coupling is automatically disconnected, think vintage car hand cranks.

Frank C.
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SlowArrow

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Re: Use drill to start hit and miss emachine engine
« Reply #5 on: August 27, 2019, 02:09:51 pm »
You need an overrun mechanism, the drill engages to turn the engine and once it starts the coupling is automatically disconnected, think vintage car hand cranks.

I agree that you could trim the drive side to make it release as the engine fires, but Jin is just pulling the drive side off in his video.  I'm not fond of having the ball side of the u-joint attached to the crankshaft as Jin does, which is why I went with a pulley and string method to start mine more easily.   Another solution would be to use something like a model airplane starter - a friction cup on a spinner.  I'm going to hang with my low tech string - I'll always have one available if I store a spare string in the base with the batteries.
Mike

crazydoug

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Re: Use drill to start hit and miss emachine engine
« Reply #6 on: August 29, 2019, 06:54:25 am »
After seeing Gils replacement crankshaft, i would advise not using a drill to start the M91. The high torque of a drill can cause the 5 piece crankshaft to loosen where the shaft is pressed together, causing continual timing changes and other problems. I learned this the hard way, and started making rope start pulleys for any engines that don't have a 1 piece crankshaft.
crazydoug

njrich50

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Re: Use drill to start hit and miss emachine engine
« Reply #7 on: August 29, 2019, 11:18:07 am »
How do you make a rope style start?


SlowArrow

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Re: Use drill to start hit and miss emachine engine
« Reply #9 on: August 29, 2019, 04:25:32 pm »
After seeing Gils replacement crankshaft, i would advise not using a drill to start the M91. The high torque of a drill can cause the 5 piece crankshaft to loosen where the shaft is pressed together, causing continual timing changes and other problems. I learned this the hard way, and started making rope start pulleys for any engines that don't have a 1 piece crankshaft.
crazydoug

Oh my - I hadn't thought about that.  The string start system works so well there really isn't a reason to consider a power starter (unless there is limited access - like is it were installed in a boat). 

Motor on!
Mike

IndianaRog

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Rope Start for M91 Hit and Miss engine
« Reply #10 on: September 04, 2019, 10:46:45 am »
Following Slow Arrow's lead, I modified an existing pulley so that it would allow a "rope" (string) start.  Video below shows just how this looks and works for anyone contemplating doing the same.  Pulley needed requires an 8 mm bore to fit the shaft on side opposite the governor weights.

https://www.youtube.com/watch?v=iIYLXSmOweI

It seems the perfect way to easily start either the M91 or even the M90 which is generally easier to start anyhow, but the string makes it a little more fun!!!

Rog
« Last Edit: September 04, 2019, 06:11:30 pm by IndianaRog »
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Raphael

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Re: Use drill to start hit and miss emachine engine
« Reply #11 on: September 04, 2019, 11:51:08 am »
Bonjour Roger,
Well done, as I have no tool, I have to find a rriend who will make one for me, I agree with you, this engine is not obvious to start with the hand only.
Raphaël
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IndianaRog

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Re: Use drill to start hit and miss emachine engine
« Reply #12 on: September 04, 2019, 06:14:04 pm »
There are a number of ebay and Amazon vendors in China selling pulleys that would work well if the 3-6 week leadtime doesn't bother you.  At under $6.00 USD each, I have just ordered two...one for the M90 and a spare for the M91.  Only critical measurement is the 8 mm bore.

Rog
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njrich50

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Re: Use drill to start hit and miss emachine engine
« Reply #13 on: September 04, 2019, 07:01:21 pm »
Can you give me a link for the pulleys?

njrich50

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Re: Use drill to start hit and miss emachine engine
« Reply #14 on: September 04, 2019, 07:28:51 pm »
There are a number of ebay and Amazon vendors in China selling pulleys that would work well if the 3-6 week leadtime doesn't bother you.  At under $6.00 USD each, I have just ordered two...one for the M90 and a spare for the M91.  Only critical measurement is the 8 mm bore.

Rog

Can you give me a link for the pulleys?
« Last Edit: September 04, 2019, 08:01:21 pm by IndianaRog »

 

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