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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: hitnmiss on August 05, 2019, 12:37:27 pm

Title: bangood Hit and Miss engine, flywheel grub screws?
Post by: hitnmiss on August 05, 2019, 12:37:27 pm
Hello everybody,
I recently ordered a hit and miss engine from banggod and so I signed up here in the forum.
The first thing I found out is that the machine runs a lot better with "Alkylatebenzin Aspen 4" than with lighter fluid.
Next, I would like to build a nicer base under the engine and possibly paint it.
That leads to my question:
Has anyone managed to loosen the grub screws that hold the flywheels in position?
I have tried 2mm, 2.5mm and 3/32 Allen keys and no one seems to fit properly.

Best regards
Thomas
Title: Re: bangood Hit and Miss engine, flywheel grub screws?
Post by: gjf on August 05, 2019, 02:37:45 pm
Welcome to the forum.

I just checked and a 2mm wrench fit the set screw on my engine.

Gil
Title: Re: bangood Hit and Miss engine, flywheel grub screws?
Post by: hitnmiss on August 06, 2019, 02:37:08 am
Hello Gil,
thank you for the warm welcome and your answer.
I tried a 2mm allen key, but it slipped.
Maybe the screws have been over tightened.
I will give it a try again.

Best regards
Thomas
Title: Re: bangood Hit and Miss engine, flywheel grub screws?
Post by: Stoker on August 06, 2019, 05:09:33 pm
Sometimes the smaller Allen wrenches get stripped and have the corners of the hex rounded off. If it looks like that has happened, it can often be fixed by simply cutting or grinding a couple of millimeters off the end to get back to a fresh cross-section with sharp corner. Do be careful not to get it hot if grinding, as that will ruin the temper and make it strip again all the easier.

I've not had any problems with any of my screws backing out, so I suspect that they only need to be tightened to a good solid snug. If you need more than that, it may be time for a little dab (very little dab) of locktight.
Title: Re: bangood Hit and Miss engine, flywheel grub screws?
Post by: hitnmiss on August 07, 2019, 12:13:40 am
Thanks Stoker,
I will try a new Allen key and if that does not work some locktight.
But that will have to wait some days, cause yesterday the new base for the engine arrived and there is some work to do on it
[attachimg=1]

Kind regards
Thomas
Title: Re: bangood Hit and Miss engine, flywheel grub screws?
Post by: Stoker on August 07, 2019, 12:25:37 am
That's certainly a very nice looking base that seems designed specifically for the engine, and would likely go along ways towards taming the hop these engines typically exhibit.

Can you let us in on the source for that?
Title: Re: bangood Hit and Miss engine, flywheel grub screws?
Post by: hitnmiss on August 07, 2019, 04:06:53 am
Hi,
I bought the base at a German company called "Bengs".
It's made for their engine "Karl".
Here ist the Link: https://www.bengs-modellbau.de/ersatzteile-karl/karl-fraesteile/karl-teil-1-maschinensockel-grauguss
The base is really heavy (about 2.2kg) and as far as I can tell of a very good quality.
I will post a picture, when the engine is mounted.

Kind regards
Thomas
Title: Re: bangood Hit and Miss engine, flywheel grub screws?
Post by: RedRyder on August 07, 2019, 06:09:58 am
Welcome aboard, Thomas...!!!!!


I am looking forward to seeing the Beng's base fitted to your M90 engine.



from Connecticut,


Gil
Title: Re: bangood Hit and Miss engine, flywheel grub screws?
Post by: RedRyder on August 07, 2019, 06:32:23 am
Thomas, the screws are not always easy to get the wrench inserted all the way. Sometimes it helps to put a little extra effort into holding the wrench straight and with a little pressure holding it all the way in. Some of the screws have something resembling loctite on them. Removing the lower piston ring also helps allow better and more complete lubrication. Mixing Coleman fuel or a pure fuel (with no ethanol and all the other poisons in automotive fuel) about 20 to 1 with Marvel Mystery Oil is a good idea.
Best of luck with it.
Title: Re: bangood Hit and Miss engine, flywheel grub screws?
Post by: hitnmiss on August 08, 2019, 09:07:00 am
Hello everybody,
I have not made any further attempts with the screws so far.
But I filled the hole on top of the base with JB-Weld and epoxy filler and than filed and sanded the surface.
Here is a picture with the engine on top of it.
[attachimg=1]
Next, the holes for fixing the engine have to be drilled.

Kind regards
Thomas
Title: Re: bangood Hit and Miss engine, flywheel grub screws?
Post by: Stoker on August 08, 2019, 09:22:30 am
That looks superb sitting atop that pedestal!
Title: Re: bangood Hit and Miss engine, flywheel grub screws?
Post by: hitnmiss on August 08, 2019, 10:26:05 am
Maybe it's a little bit to large  ???
But there is enough space inside for the batteries and the ignition system.

Kind regards
Title: Re: bangood Hit and Miss engine, flywheel grub screws?
Post by: hitnmiss on January 05, 2020, 02:49:55 am
Hi there,
after showing the raw base for my hit and miss engine from Banggood here some time ago, I can now report some progress  :)
All required holes are drilled and threads are cut to fit the switch and the tank.

[attachimg=1]

The base is painted in gun metal gray, with a matte 2k topcoat.
The motor is fixed with stainless steel studs and threaded sleeves inside the base.

[attachimg=2]

[attachimg=3]

Ignition and batteries are mounted on an aluminium plate inside the base, which is screwed onto these sleeves.
The wires leading from the reed contact to the ignition system are led down through a hole in the base.
Unlike the blue engine here not a Hall sensor, but a reed contact is used (two instead of three wires)

[attachimg=4]

[attachimg=5]

[attachimg=6]

Almost all screws on the engine are exchanged for hexagon bolts.

[attachimg=7]

[attachimg=8]

Maybe some time in the future I will add a nice generator and mount everything together on a wooden base, but there is no time for that now.

Kind regards,
Thomas
Title: Re: bangood Hit and Miss engine, flywheel grub screws?
Post by: St Paul Steam on January 05, 2020, 06:42:19 am
Wow, you have really sourced just the right base for you Hit-N-miss engine, that should be replicated all over the place.
Title: Re: bangood Hit and Miss engine, flywheel grub screws?
Post by: CBWho on January 05, 2020, 07:30:13 am
Your base fits like a glove! Very well done!
Title: Re: bangood Hit and Miss engine, flywheel grub screws?
Post by: txlabman on January 05, 2020, 08:32:20 am
Excellent project!

Thanks for a nice detailed build thread.
Title: Re: bangood Hit and Miss engine, flywheel grub screws?
Post by: RedRyder on January 05, 2020, 08:32:32 am
That is a superb upgrade...!!!


Thanks for the update!


Gil
Title: Re: bangood Hit and Miss engine, flywheel grub screws?
Post by: Nick on January 05, 2020, 10:53:32 am
Very nice improvements Thomas  8)
Title: Re: bangood Hit and Miss engine, flywheel grub screws?
Post by: rodnoc on January 05, 2020, 04:34:34 pm
Thomas, very nice mods!  Does the new base have enough weight to keep the engine from jumping?
Title: Re: bangood Hit and Miss engine, flywheel grub screws?
Post by: hitnmiss on January 06, 2020, 02:10:44 pm
Hi,
I slowed the engine down by lengthening the springs a little bit and the base has some rubber under its feet.
So there is no jumping around any more.

Kind regards,
Thomas
Title: Re: bangood Hit and Miss engine, flywheel grub screws?
Post by: 70Rcode on January 09, 2020, 02:42:08 am
Hi Thomas,..you can fix the grub screw problem by tapering down grinding a sae 3/32" size allen/hex wrench until it just fits.Those grub screws are semi-stripped rounded out plus the 2mm wrench is a bit undersize, but the "customized" 3/32"" will work real good. Good luck wirh you well done engine mods project.
Title: Re: bangood Hit and Miss engine, flywheel grub screws?
Post by: hitnmiss on January 11, 2020, 03:32:00 am
Hi and thanks for your hint.
I will try this out.

Kind regards,
Thomas
Title: Re: bangood Hit and Miss engine, flywheel grub screws?
Post by: 70Rcode on January 11, 2020, 12:08:14 pm
Taper down the 3/32" kinda just to fit the grub screw at the wtench tip &  turn either direction while applying strong downward pressure into the screw while turning. Worked for me after i had exhausted all other efforts.
Title: Re: bangood Hit and Miss engine, flywheel grub screws?
Post by: hitnmiss on January 16, 2020, 01:04:04 pm
Hi and thanks again.
As imperial size wrenches are difficult to get here locally, I ordered one on ebay.
I will report back when I got it and have customized it.

Kind regards
Thomas
Title: Re: bangood Hit and Miss engine, flywheel grub screws?
Post by: 70Rcode on January 16, 2020, 05:34:20 pm
Hi Thomas, ..as mentioned by Stroker, don't get the hex wrench  hot..i used a fine tooth flat file and filed all 6 sides of the 3/32" wrench in a Slight tapered wedge shape until the tip just fit into the grub screw. Then, after tapping wrench down for max seating & applying hard downward force, Slowly turn that sucker counter-wise & you should feel it break lose without slipping or rounding anything off. Good luck with your process, tom