Author Topic: 1/3 Scale IHC Famous  (Read 12763 times)

Offline Admiral_dk

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Re: 1/3 Scale IHC Famous
« Reply #75 on: June 09, 2019, 10:06:15 PM »
Great result - you should be happy with that  :ThumbsUp:

Offline Martin Cottrell

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Re: 1/3 Scale IHC Famous
« Reply #76 on: June 10, 2019, 09:36:50 AM »
Marvellous pictures of your fabrication methods Toby. It is clear that you and your Dad are both very skilled craftsmen!

Martin.


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Online TobyTetzy

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Re: 1/3 Scale IHC Famous
« Reply #77 on: June 10, 2019, 10:19:58 AM »
Hello,
Thank you for your comments.
From time to time I still have air bubbles in the tires, especially in the big tires.
That's because I need 19ml material, but my syringe is only 20ml. If I press too much, the rest of the air from the syringe comes in the mold.
If I press too little, air will remain in the vent syringe at the other end of the mold.
I have already ordered larger syringes.
What do not you do for the hobby?
But it is always nice to see a finished result.

Greeting Toby

Offline Roger B

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Re: 1/3 Scale IHC Famous
« Reply #78 on: June 10, 2019, 12:58:47 PM »
Excellent work on the tyres  :praise2:  :praise2:
Best regards

Roger

Online TobyTetzy

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Re: 1/3 Scale IHC Famous
« Reply #79 on: July 06, 2019, 06:06:14 PM »
Hello,

This week I got a test print of the stickers for the IHC.
Unfortunately, the color on the transparent film is not thick enough.
More test stickers are in the works.

Greeting Toby

Online TobyTetzy

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Re: 1/3 Scale IHC Famous
« Reply #80 on: October 02, 2019, 06:38:45 AM »
Hi,
I have now got stickers that were printed on a white background.
It looks much better.
At the engines are still many little things to do that last a long time.
Greeting Toby

Offline b.lindsey

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Re: 1/3 Scale IHC Famous
« Reply #81 on: October 02, 2019, 07:15:34 PM »
The new decals look great Toby!!!

Bill

Online TobyTetzy

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Re: 1/3 Scale IHC Famous
« Reply #82 on: October 16, 2019, 11:43:59 AM »
Hi,
my dad finished the engines.
Here are some pictures and a video.
The clutch pulley works very well as well.
Unfortunately, the engine needs more ignitions to get back into Miss mode. It would be better if the engine would ignite only once.
I do not know why.
If someone has a hint for us, we would be very happy.

Greeting Toby

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

Offline MJM460

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Re: 1/3 Scale IHC Famous
« Reply #83 on: October 16, 2019, 11:56:08 AM »
Hi Toby, what a beautiful job by you and your father.  One to be really proud of.

Regarding the number of ignitions, my understanding is that as you load up the engine, it fires more often.  I wonder if the new engine plus the load from the water is just adding enough load to require the extra power strokes until things loosen up a bit.  It looks and sounds so good, it is hard to believe there is much wrong.  But I am sure that others with more experience in that area will be along soon.

MJM460

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

Offline Chipmaster

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Re: 1/3 Scale IHC Famous
« Reply #84 on: October 16, 2019, 11:59:18 AM »
That engine is superb.
Andy

Offline Admiral_dk

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Re: 1/3 Scale IHC Famous
« Reply #85 on: October 16, 2019, 12:24:28 PM »
Very beautiful engine and it runs nice too :praise2:

There are many factors involved, but it does not sound very powerful (I might be wrong) and it requires some power to accellerate those flywheels - and do not make them lighter, as it will not coast as well ....

You might have a slightly too strong inlet spring, that prevents it from breathing as well as nesessary.
 

Online TobyTetzy

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Re: 1/3 Scale IHC Famous
« Reply #86 on: October 16, 2019, 12:45:33 PM »
Hi,
thank you for the answers.

The engine does not have much power.
(It even has less power than the small 17.5 cc motor my father built before, which had only 20 Watts with a powered generator.)
The IHC runs but also with very low speed, about 700 U / min.
If I increase the speed, with stronger springs on the flyweights, it has more power.
But then it still needs 2, sometimes 3 ignition sequences until it comes in the state of miss.

I will discuss this with the inlet valve spring with my father.
Thanks for the hint.

Greeting Toby

Online awake

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Re: 1/3 Scale IHC Famous
« Reply #87 on: October 16, 2019, 04:52:20 PM »
Toby, I am a complete newbie to IC model engines, so take this with a grain of salt, but ... it looks/sounds to me as though the valve is cycling more often than the engine is firing - there might be a couple of cycles of the valve and then a pop. Especially towards the end, it often sounded like the engine only fired once on each hit, but it took two or three cycles of the valve to do so.

Regardless, absolutely beautiful work!

Offline Alyn Foundry

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Re: 1/3 Scale IHC Famous
« Reply #88 on: October 16, 2019, 08:07:45 PM »
Absolutely beautiful Toby, both you and your father should be proud.

Don't forget that at the moment the engine is " bedding in " and it's perhaps a little early to be tinkering.

However after a few hours you might find that a slight restriction in the air intake and with a little richer fuel mixture that you'll get a single hit with several misses in between.

As a point of note, hit and miss governing was only fitted to prevent the engine from going into destruction if the drive belt broke or became disconnected. Normally, under load ( working ) conditions they would fire every time.

Cheers Graham.

Offline Jasonb

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Re: 1/3 Scale IHC Famous
« Reply #89 on: October 16, 2019, 08:17:55 PM »
You should not expect much power from it as it is in the video, think of it like your car engine when sitting in traffic - it is just ticking over. Once loaded it will fire on every stroke and that is when the power comes in. For example if you had this driving a saw rig it would just tick over until some wood was fed into the blade which would put load on it and then the engine will pick up to drive the saw through the wood.

A slight reduction in the venturi diameter may help to get the correct mixture when the engine first misses

Right at the end of this video you can hear the engine fire on every stroke when I load the flywheel

t=26s
« Last Edit: October 16, 2019, 08:25:49 PM by Jasonb »