Author Topic: Bugatti Typ 50 1/4 Scale model  (Read 73576 times)

Offline Vixen

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Re: Bugatti Typ 50 1/4 Scale model
« Reply #225 on: March 03, 2018, 09:16:32 PM »
Hello Michael

In my book, the flat electrode is prefered to a sharp pointed electrode.

The air around the spark becomes ionised and the next spark finds the path of least resistance, which is never the path of the previous spark. If you were able to view the tip of the electrode you would see the train of sparks progressing around the outside of the broad (flat) electrode. With a pointed electrode, the spark's options are limited.

Other may disagree, then you have to decide yourself.

Mike
It is the journey that matters, not the destination

Sometimes, it can be a long and winding road

Offline Art K

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Re: Bugatti Typ 50 1/4 Scale model
« Reply #226 on: March 03, 2018, 11:13:19 PM »
Michael,
The water pump looks great. I was looking at it trying to figure out the flow direction but could only go one direction. Can't help with the spark plug question.
Art
"The beautiful thing about learning is that no one can take it away from you" B.B. King

Online Roger B

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Re: Bugatti Typ 50 1/4 Scale model
« Reply #227 on: March 04, 2018, 06:49:29 AM »
I agree with Mike, a flat surface with a relatively sharp edge. A spark will start more easily from a sharp point or edge, hence the rounding off of high voltage components. A needle point in a spark plug will get very hot and erode rapidly as well as being a potential cause of pre ignition.
Best regards

Roger

Offline michelko

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Re: Bugatti Typ 50 1/4 Scale model
« Reply #228 on: March 04, 2018, 07:45:54 AM »
Thanks for your suggestions and wisdom. I will go with the flat tip.
@art: it is a centrifugal pump. These can only work in one direction. Pressure side is directed to the side cover of the block.

Michael
« Last Edit: March 04, 2018, 09:19:43 AM by michelko »

Offline michelko

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Re: Bugatti Typ 50 1/4 Scale model
« Reply #229 on: March 04, 2018, 09:17:23 AM »
Took some time to start with the new batch of plugs because i converted my mill to beltdrive.
I didnīt liked the annoying noise of the gears.

Here are some pics from the manufacturing.
At first i sawed the big Piece of macor apart like a cake. Bill provided me with some 25mm round bars.
To get as much as possible out of the Stock i used these process. It gave me nine pieces.
second step was making them round.
And then giving them the desired shape.


« Last Edit: March 04, 2018, 09:21:23 AM by michelko »

Offline Vixen

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Re: Bugatti Typ 50 1/4 Scale model
« Reply #230 on: March 04, 2018, 10:00:33 AM »
Nice start on the new batch of spark plugs. You did well in getting nine pieces out of the big piece of Macor.

Can you post a drawing of the proposed spark plug design?

Mike
It is the journey that matters, not the destination

Sometimes, it can be a long and winding road

Offline michelko

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Re: Bugatti Typ 50 1/4 Scale model
« Reply #231 on: March 04, 2018, 03:01:07 PM »
AAARRRGH,
just destroyed two blanks.
First  broke one of t these stupid Little 1mm drills. Couldnīt get it out of the blank without breaking the makor. :'(

Second one i machined a wrong Dimension because i was unconcentrated and  had already the first Desaster in mind.
 :hammerbash:

@Mike: here is a cut pic from the new design. Donīt mind the Separation line in the pic, the Isolater s just one Piece.

Michael

Offline Vixen

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Re: Bugatti Typ 50 1/4 Scale model
« Reply #232 on: March 04, 2018, 03:41:17 PM »
AAARRRGH Michael, I feel your pain. Bummer

Be cool, take it easy. Things will work out just fine from now onwards

So you are using the same design as before, except now it will be a one piece insulator.

Mike

It is the journey that matters, not the destination

Sometimes, it can be a long and winding road

Offline michelko

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Re: Bugatti Typ 50 1/4 Scale model
« Reply #233 on: March 04, 2018, 04:37:43 PM »
Another difference is the shape of the ground electrode

Michael

Offline michelko

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Re: Bugatti Typ 50 1/4 Scale model
« Reply #234 on: March 05, 2018, 09:58:57 AM »
Hi,
here are the new plug parts.
Little treasure chest  ;)

Michael

Online Roger B

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Re: Bugatti Typ 50 1/4 Scale model
« Reply #235 on: March 05, 2018, 10:30:46 AM »
Splendid  :praise2: I hope that they are successful  :wine1:
Best regards

Roger

Offline michelko

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Re: Bugatti Typ 50 1/4 Scale model
« Reply #236 on: March 05, 2018, 11:01:51 AM »
Splendid  :praise2: I hope that they are successful  :wine1:

believe me i too

Michael

Offline Vixen

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Re: Bugatti Typ 50 1/4 Scale model
« Reply #237 on: March 05, 2018, 11:47:16 AM »
Hello Michael,

It looks like you have eight little gems in your treasure chest. Bravo.

Mike
It is the journey that matters, not the destination

Sometimes, it can be a long and winding road

Offline michelko

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Re: Bugatti Typ 50 1/4 Scale model
« Reply #238 on: March 07, 2018, 08:37:47 AM »
Hi,
after i finished the plugs i made another test run yesterday.
I think this is the best Batch of plugs that i made till now.
Engine was running realy nice with very low idle.
But i noticed an other old Problem from that i thought it has gone.
The ignitionbox has big Problems with noise from the sparks.
I saw rpm Spikes up to 17000 upm while running near idle.
This is causing missfiring and after some minutes the plugs where again wet.

I am thinking of using a analog ignition System  with a transitor, single coil and a Distributor

Michael

Online Roger B

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Re: Bugatti Typ 50 1/4 Scale model
« Reply #239 on: March 07, 2018, 09:17:27 AM »
Are your coils solidly connected to the engine block? There must be a good return path for the spark current.
Best regards

Roger

 

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