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Re: the Fatal Flaw engine Empty

Re: the Fatal Flaw engine

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Thinking Re: the Fatal Flaw engine

Post  davidll1984 Tue Jan 04, 2022 12:08 pm

Today I received the Fatal Flaw engine from fredvon4  cheers  Re: the Fatal Flaw engine 16413110
I received at the same time a part to modify the engine a precision throttle control for it i was tinking To fit à medalion cylinder To it... And  Mom told son it's a gift for daddy My little boy was, I think, more excited than me, his eyes were on the engine that I had just unloaded from the box, and his eyes were   on the parts I had left the new package on the table Strange the package looks like a hottwheel package for him So he rushes to take the package run in the living room and then the inevitable happened boom explosions of little parts Shocked Doh! affraid  Re: the Fatal Flaw engine Img_2261
Let's say he likes to destroy the hotwheel package m'y o m'y No!  m'y boy Neutral I was able to save everything, I have all the pieces, I put the pieces back togetherRe: the Fatal Flaw engine 16413111
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Thinking Re: Re: the Fatal Flaw engine

Post  davidll1984 Tue Jan 04, 2022 12:29 pm

Unfortunately Sportman's new cylinder and piston does not fit the médalion engine crankcase  the sportman piston fit the engine but Not its cylinder it has no compression in the médalion cylinder as the piston is mutch smaler and taper but I have a piston that perfectly  fit the médalion cylinder wit super Good compression I only need one connecting rod a piston pin and a litle retainer clip Re: the Fatal Flaw engine 16413210Re: the Fatal Flaw engine 16413211
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Thinking Re: Re: the Fatal Flaw engine

Post  davidll1984 Tue Jan 04, 2022 7:56 pm

I tried to make a connecting rod but not perfect lets say i Will do bether wit the second one I will continue to work on this piece To repair the hole that I missed I could use a brass bushing The first time it's never perfect Laughing lol! Re: the Fatal Flaw engine 16413412
Re: the Fatal Flaw engine 16413410
Re: the Fatal Flaw engine 16413411 I knew it wouldn't be easy that's why I wanted it The higher the difficulty level, the better But I immediately wanted to have it because this engine model is different, that intrigued me It’s Not all the same parts its weird that with the .15 models, there is a difference between the parts of al the different models. Larger cylinder larger piston i dont understand that the rc aluminium exaust model is Not the same size as the rc ring ?? And the précision throttle control fit m'y sportsman .15 cylinder Who are too small tread To fit this rc médalion Huh...
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Thinking Re: Re: the Fatal Flaw engine

Post  fredvon4 Wed Jan 05, 2022 5:05 am

David long shot but check out and see if still for sale

https://www.rcgroups.com/forums/showthread.php?4014611-Cox-Medallion-15-Runner%21-Complete


ooops it sold already....sorry
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Thinking Re: Re: the Fatal Flaw engine

Post  davidll1984 Sat Jan 08, 2022 9:40 am

It is this piston model that I want to reproduce as closely as possible to the original that I can Also add some modification improvement to the original design Re: the Fatal Flaw engine Scree132
It is this model of piston which should be found in this engine
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Thinking Re: Re: the Fatal Flaw engine

Post  davidll1984 Tue Jan 11, 2022 5:24 pm

Due to the extremely cold temperature I was unable to work in the garage Here is the temperature indicated on my little duratrax thermometer -54°c Cold The fingers would stick on the handles of the lathe Re: the Fatal Flaw engine Img_2263
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Thinking Re: Re: the Fatal Flaw engine

Post  balogh Wed Jan 12, 2022 10:28 am

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Thinking Re: Re: the Fatal Flaw engine

Post  davidll1984 Wed Jan 12, 2022 6:06 pm

Huh... strange its Not there Not avalible ? Looks like he's already gone? I don't know it's strange no sale price
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Thinking Re: Re: the Fatal Flaw engine

Post  Oldenginerod Wed Jan 12, 2022 7:21 pm

davidll1984 wrote:Huh... strange its Not there Not avalible ? Looks like he's already gone? I don't know it's strange no sale price

That's Bernie's alternative eBay store so it might pay to contact him and ask why it was withdrawn.
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Thinking Re: Re: the Fatal Flaw engine

Post  davidll1984 Thu Jan 13, 2022 2:00 am

I sent a message but I don't know if it is still available  I would only use the piston I would like to find a piston alone no nead of a new cylinder m'y is new I was working on à conecting rod To day Re: the Fatal Flaw engine Img_2264
But if I can find the right piston I prefer to install the right part than to do wit what I can find that fit i found a enya .15 piston that fit Somehow in the cylinder but I would have to modify it a lot to be able to use it which is out of the question in the worst case I modify all the engine to use piston made of aluminum I am thinking of inserting a new sleeve I have measured it is possible and feasible but this cylinder is new and if i do this I'll swap it for an old broken rc .15 cylinder If anyone has an old broken and defective cylinder for a rc .15 mabe i have a new rc cylinder To trade Huh...  It's hard and almost impossible to find just a piston This is the kind of piece that we find in pairs That if I buy a replacement the cylinder will surely come with its piston so Huh... I think for now I'm going to put this engine aside and wait and see Small Cox Logo Huh... Babe Bee .049
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Thinking Re: Re: the Fatal Flaw engine

Post  Oldenginerod Thu Jan 13, 2022 3:21 am

davidll1984 wrote: I think for now I'm going to put this engine aside and wait and see Small Cox Logo Huh... Babe Bee .049

I think that's best. By rushing you may end up wasting a lot of time and possibly damaging irreplaceable parts. It may take some time, but I'm sure that if you are patient then you will eventually find the correct piston and rod.
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Thinking Re: Re: the Fatal Flaw engine

Post  davidll1984 Thu Jan 13, 2022 6:49 am

Posible one day mabe It's not like I don't have another engine to play with I got this engine at a good price, it's not that bad I found another new one that seems to be still available It’s sure that I’m not going to wait for years otherwise that's what I'm going to do my best to give her life no matter what hapen To it its just for the fun Very Happy
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Thinking Me tinking

Post  davidll1984 Fri Jan 14, 2022 10:57 pm

Well here we go again my brain hasn't stopped working on the problem of this engine with different pistons but a predominant idea that doesn't stop To come back I put it aside then come back as an obvious sign That I'm going to have trouble finding such a rare piece and that this cylinder must remain as it is So I decided to tempt to make a cylinder liner made of aluminum to insert inside a cylinder made of chrome plated brass from another engine which has nothing to do with Cox engines by the way It was while talking about these engines that the idea came But seemed wacky to me ... but I imagined it differently, in other words it was just a start The spark that started it all in m'y brain I also found some special points of this engine that I had never seen in this way a small simple modification
That I had never noticed on other smaller motors On the crankshaft a small notch which leads to the cavity this smaller part of the front the place for oil To lubricate crankchaft I wonder if another different medallion model has this little detail.??? Huh... Re: the Fatal Flaw engine 16422210
Re: the Fatal Flaw engine 16422211
I said to myself well that's what I needed to fill this cavity with pure Castor oil on the first start. I have this habit that came to me a long time ago I used to put a few drops of pure oil in the venturi then with the finger I blocked the air inlet I turned in the opposite direction several times then the excess I brought out and emptied it directly into the fuel bottle we can see that less oil comes out
Ok back to the main idea the idea is to build a new upgrade for these .15 I believe this could work well But I face several challenges the first is to make the treads of the base of the cylinder But nothing is impossible at this point I recovered some materials for the manufacture of this project   Re: the Fatal Flaw engine 16422213
      I also have another project in the shadows to hide from view an engine which will be very special I don't think anyone has seen this prototype engine at least not with this configuration of parts
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Thinking Re: Re: the Fatal Flaw engine

Post  davidll1984 Thu Jan 20, 2022 11:45 am

today the temperature allowed me to work in my garage I made some modifications To a .15 ae engine
She's made very thin now Re: the Fatal Flaw engine 16427011
Re: the Fatal Flaw engine 16427010
I even made a little video next the cylinder It will end in several video step by step Very Happy Small Cox Logo Babe Bee .049
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Thinking Re: Re: the Fatal Flaw engine

Post  davidll1984 Fri Jan 21, 2022 1:01 pm

Here is the cylinder in productionRe: the Fatal Flaw engine Img_2266
Re: the Fatal Flaw engine Img_2267
It will be bigger but lighter in the end Small Cox Logo Babe Bee .049 Very Happy
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Thinking Re: Re: the Fatal Flaw engine

Post  davidll1984 Wed Feb 02, 2022 12:04 pm

Today I have a good day to work on the new cylinder the temperature is warmer my garage is very poorly insulated only a smal section for the machine room is insulated I was able to drill the hole in the center and enlarge it with a boring bar its Not finish and it would already be over if I could receive the die faster i have received the handle die holder Re: the Fatal Flaw engine Img_2271
Re: the Fatal Flaw engine Img_2270
During this time the piece is stuck in the chuk to keep the geometry and Not of set the hole or the tread i have To made Perfect first time It's a long wait . Tired w/ Coffee Read
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Thinking Re: Re: the Fatal Flaw engine

Post  davidll1984 Fri Feb 11, 2022 10:45 am

Finaly in time Very Happy bounce cheers Re: the Fatal Flaw engine 16445910
We're going back to work, let's go, I'll make another video soon Clapping
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Thinking Re: Re: the Fatal Flaw engine

Post  davidll1984 Fri Feb 11, 2022 2:48 pm


Re: the Fatal Flaw engine Img_2273 Good progres To day Small Cox Logo Babe Bee .049 Eyebrows cheers
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Thinking Re: Re: the Fatal Flaw engine

Post  davidll1984 Sun Feb 13, 2022 3:19 pm

Let's say that I'm almost finished but there are still some details to be worked out I can't wait to test to see the result As I anticipated the engine should be lighter It's not finished but already lighter than the original Remaining holes to be drilled And the depth of cooling fins Re: the Fatal Flaw engine Img_2277
Re: the Fatal Flaw engine Img_2278
Re: the Fatal Flaw engine Img_2279
Small Cox Logo Babe Bee .049
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Thinking Re: Re: the Fatal Flaw engine

Post  davidll1984 Tue Feb 15, 2022 11:08 am

I'm almost done in this form the motor could run but I want To instal a tune pipe so y have To make a exaust collector I also have to find a shim for the Front trust washer Cause if I push on Back and forth it move its not good for the connecting rod Because it's not loose enough and has no ball joint at the end
Like the original cox engine has so far everything should be fine once finished I can't wait to test it Small Cox Logo Babe Bee .049 Smoking Eyebrows Re: the Fatal Flaw engine 16449411
Re: the Fatal Flaw engine 16449412
Re: the Fatal Flaw engine 16449410
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Thinking Re: Re: the Fatal Flaw engine

Post  davidll1984 Tue Feb 15, 2022 11:45 am

Re: the Fatal Flaw engine Img_2280
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Thinking Re: Re: the Fatal Flaw engine

Post  getback Wed Feb 16, 2022 5:40 am

I see you have ported the cylinder , do you have a fit that the liner want rotate ?Looking good ! Very Happy
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Thinking Re: Re: the Fatal Flaw engine

Post  davidll1984 Wed Feb 16, 2022 6:40 am

Yes the liner cant rotate Its lock in place with the screw of the motor head plus it is very tight To inserts Not just wit hand I am working on an exhaust system I would need a profille pipe I can use a car pipe for tests Another stage where I scratch my head Thinking what I can do to come up with a viable system that does something Several small modification not mentioned some Who would get too technical to explain The crankcase is original unmodified but everything else yes Re: the Fatal Flaw engine 16450110
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Thinking Re: Re: the Fatal Flaw engine

Post  cstatman Wed Feb 16, 2022 8:22 am

some well planned, beautiful machinework there. outstanding!
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Thinking Re: Re: the Fatal Flaw engine

Post  davidll1984 Sat Feb 26, 2022 1:02 pm

À Litle update on this engine Babe Bee .049 bounce cheers it work Clapping Ok ok no too hasty excitement I have to finish this just have the motor in one hand with the glow driver on the other But what I thought I don't know confused No! But let's say it's less worse than you might think As you can imagine it would be hard to do this without injury or damage. Doh! Let's say that a small injury on me is not serious On the other side the glow driver and the propeller Won't fix it on their own like me m'y thumb is ok Just a little burn cause I put my finger on the exaust hole i was trying to prevent the motor from gaining more rpm speed Never again is it too scary affraid That's not all I had to stop it with the other hand which held the glow driver firmly. Who finally stopped the engine Here the result of my very not brilliant ideaRe: the Fatal Flaw engine 16459011
Re: the Fatal Flaw engine 16459010
Razz But I'm very happy with the result anyway. It's not a small burn that will make me cry the prop on the other hand Doh! lol!
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