Speedys inline twin

[Speedy]

I'm thinking long term, if I would have the use for the spiral.
The quotes on price was for plug 14.30 canadian spiral point 21.81

I to think the cheap will be fine, I'm assuming it would work on steel if I ever needed to? Since its the glow plug thread I might have a use for that down the road.

 

[sssfox]

This may help with your decision:

http://www.gjhall.co.uk/em/uploads/docs/08b253b7d6edbf1c40f849888df04207.pdf

 

[Speedy]

Thanks! Great read for me, I feel the cheaper one will do everything ill need.

 

[gus]

Thanks! Great read for me, I feel the cheaper one will do everything ill need.

Hi Speedy,

Spiral Taps are expensive and tends to break when used like a straight flute tap which we normally turn forth and back.Spiral taps best used ,clamped in drill press chuck and turned all the way through by hand. Use Tapmatic Oil.
Same tapping oil has one version for all metals except Aluminium. They also have a version for Aluminium.But kerosene is fine.

1/4 x 32 tpi UNEF taps are available from aeromodel shops.Bought mine from such shop in Singapore.Cost me US$10.

My Glow Plug Engine is progressing well.

 

[Speedy]

thanks Gus.
with abit of shopping I probably could have found it elsewhere but for some reason its slightly harder to locate.

here are more pics I took while building.


crank done, transfer ports 18degrees l/r for timing (hope I did that right!)

crank case done

all slides in happily, have binding on the section of the crank that has the ports. maybe need to run the reamer in it again or file more out of the crank not to sure

 

[gus]

Hi Michael,

Please keep posting fotos as you go.

Now looking out for V2 engine plans. Radial will be tough for my limited machine tool capacity.

 

[Speedy]

much thanks and appreciation goes out to member stevehuckss396 he kindly threaded the cylinders for me.

finished the case off by drilling and tapped for the carb.
I cut the crank pins, but evidently a mistake was made. need to go back and re measure. anyhow thats for the weekend.

the carb seems to be happier in this position, either way I need to do some trimming to make the carb open fully, disadvantage hard to tune with no finger room

just to show the other option involving more trimming then the other and slightly harder to make it servo operated. but on the other hand way easier to tune
I hate decisions.

 

[Speedy]

it runs, needs some tweeking.
not sure its hitting strong on the second cylinder.

ball bearings to come.

[ame]http://youtu.be/2a3W_FjaEVk[/ame]

 

[Brian Rupnow]

That is really neat!!! I would like to know more about it.---Brian

 

[stevehuckss396]

Well what's next?

Or this!

Just kidding. I'm glad everything worked out for you.

 

[WiKKiDWidgets]

I think that Budweiser is next. Great job Speedy.

 

[Speedy]

a celebratory drink does sound like a good idea

thanks for all the kind comments guys, this is my first engine and I am proud of it

Steve, I landed a tap so I am up for making more engines with these cox cylinders, its addicting.
where did you get plans for the radial? that is great idea!

I am thinking of putting ball bearings in the front and rear.
I want to also get the engine anodized so its not done just yet.

 

[stevehuckss396]

where did you get plans for the radial? that is great idea!

It's my own design.

 

[Speedy]

very nice. I cant imagine making my own designs just yet. sometime I hope.

I still seriously want to start your little demon, I have ways to go but its high on my list.

 

[gus]

You are my hero. You make it look so easy.

Gus is still trying to get his FireFly started and spin.Looks like a major rework or more likely start from scratch. Make too many errors.I.C. engines are not as forgiving as steam engines with certain critical fits.

 

[Speedy]

That is really neat!!! I would like to know more about it.---Brian

hi Brian. the author Jerry James has these plans published for free. he also has a inline 4 and working on a v4.

the cylinders and piston/rod come from hobby motors, the old 1/2a cox .049s. they fire 180deg from each other. I think it was the perfect starter engine

thank you Gus.
far to kind, your engine is far more labour intensive all I did here was make a bottom end, your doing the whole deal! it will fire up