Author Topic: a very small 4 stroke engine : 1.35cm3  (Read 10546 times)

Offline Zephyrin

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Re: a very small 4 stroke engine : 1.35cm3
« Reply #45 on: March 16, 2021, 08:41:19 AM »
Hi,
nothing new in the future carburettor Roger : a simple 2 needle model carburettor with an air valve that moves as it rotates and decreases the fuel intake while closing the air, a little bit smaller.
For miniaturization, I look carefully at your posts!

Offline Johnmcc69

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Re: a very small 4 stroke engine : 1.35cm3
« Reply #46 on: March 16, 2021, 03:14:47 PM »
 :ThumbsUp:
 Looking good Zephyrin!

 What did the final gear ratio work out to be?

 John

Offline Zephyrin

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Re: a very small 4 stroke engine : 1.35cm3
« Reply #47 on: March 17, 2021, 10:28:33 AM »

Thanks John !
 This diesel shunter drags at about 50 km/h on the track, so 265 rpm for its 1 m wheels; value which has to be kept on the Gauge 1 scale model (1/32), that is 300 rpm (which gives an actual speed of 2 km/h on the model with 34 mm dia wheels).
Therefore, a 15 times reduction of the engine speed (4800/300) should be in the right range.
This is what I got with a fixed reduction of 6, followed by a variable reduction on the friction drive of about 3 to 0.9 ( about 1.5 at the middle), and a final reduction of 1.66 on the loco's axles.
I would clearly prefer faster locos...but unrealistic for the trains buffs at the club

Offline Johnmcc69

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Re: a very small 4 stroke engine : 1.35cm3
« Reply #48 on: March 20, 2021, 06:09:12 PM »
 :ThumbsUp:
 Thanks Zephyrin!

 John

Offline Zephyrin

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Re: a very small 4 stroke engine : 1.35cm3
« Reply #49 on: September 12, 2021, 11:20:55 PM »
Hi,
We had the authorization to meet us at our model railroad club, (thanks to a anticovid vaccination certificate !) and of course we ran our steam locomotives...

i took the opportunity to start the engine of my little "diesel" shunter and run it some laps on the track...
I was waiting for doing these runs for several months !

<a href="https://www.youtube.com/watch?v=QoGXdqTmF0U" target="_blank">http://www.youtube.com/watch?v=QoGXdqTmF0U</a>

<a href="https://www.youtube.com/watch?v=VwDeO6ktf7A" target="_blank">http://www.youtube.com/watch?v=VwDeO6ktf7A</a>

I was very happy to show her to colleagues, and happy too with her performance too...
even if I had to add an extra wagon to carry the bulky HT coil and battery, my electronic ignition planned to be housed under the bonnet being still not at its best !

« Last Edit: September 27, 2021, 10:40:13 AM by Zephyrin »

Offline RReid

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Re: a very small 4 stroke engine : 1.35cm3
« Reply #50 on: September 13, 2021, 12:19:02 AM »
That looks and runs great, Zephyrin. Very glad you finally got the chance! :ThumbsUp:
Regards,
Ron

Offline crueby

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Re: a very small 4 stroke engine : 1.35cm3
« Reply #51 on: September 13, 2021, 12:33:10 AM »
Fantastic!!   :praise2:

Online Kim

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Re: a very small 4 stroke engine : 1.35cm3
« Reply #52 on: September 13, 2021, 05:12:43 AM »
Wow!  I'll say!  That little guy just buzzes around the track like nobody's business!  You SHOULD feel quite good about this!

Kim

Offline Roger B

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Re: a very small 4 stroke engine : 1.35cm3
« Reply #53 on: September 13, 2021, 07:40:25 AM »
Excellent  :praise2:  :praise2:  :wine1:
Best regards

Roger

Offline Zephyrin

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Re: a very small 4 stroke engine : 1.35cm3
« Reply #54 on: September 13, 2021, 09:26:31 AM »
thanks for the appreciations..
i really enjoyed this "public test run" at the club.

https://photos.app.goo.gl/hc6CcCxBbx1GbPTu6

I have to think to the next model,  a new project or finishing an unfinished ones at least ?

Offline john mills

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Re: a very small 4 stroke engine : 1.35cm3
« Reply #55 on: September 13, 2021, 09:53:45 AM »
great engine looks good towing the wagons
John

Offline Admiral_dk

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Re: a very small 4 stroke engine : 1.35cm3
« Reply #56 on: September 13, 2021, 11:15:57 AM »
Looks like you could not ask for more - did you have to do a lot more fine tuning to achive this performance ?

Offline MJM460

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Re: a very small 4 stroke engine : 1.35cm3
« Reply #57 on: September 13, 2021, 01:49:52 PM »
Hi Zephyrin, congratulations, that is running beautifully.  Thanks for the video.

MJM460

The more I learn, the more I find that I still have to learn!

Offline Zephyrin

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Re: a very small 4 stroke engine : 1.35cm3
« Reply #58 on: September 13, 2021, 06:49:08 PM »
Hi,
Yes it is exactly that, this model is finished for me ! 
Maybe I should ask to a fellow at the club to make a neater video at a next meeting.
the engine is not that complicated, very conventional design, its just the small size to fit under the cockpit (?) that make some parts difficult to machine.
most of the things went well when I leaved my electronic ignition !

Offline Johnmcc69

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Re: a very small 4 stroke engine : 1.35cm3
« Reply #59 on: September 14, 2021, 01:30:04 AM »
 :NotWorthy:
Magnificent!
 Very well done & glad to see it on the track!

 John
 

 

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