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Topic: Johnny Popper
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no photo

Unknow

Sat 08/05/23 03:41 PM

Is any one familiar with this term, it's a nickname.
And No, it's not a reference to the infamous
Mr. "Johnson", or "pop goes the weasel".
Riverspirit1111's photo

Riverspirit1111

Sat 08/05/23 04:05 PM

It vaguely sounds familiar but I can't place it
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Unknow

Sat 08/05/23 04:09 PM

I'm guessing that only a few are familiar with it.
hint: second profile pic. But why the nickname?
Riverspirit1111's photo

Riverspirit1111

Sat 08/05/23 04:15 PM

Hmmm... because it pops seeds? laugh
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Unknow

Sat 08/05/23 04:18 PM

Nope, but it could be used to pull a seed planter.
Riverspirit1111's photo

Riverspirit1111

Sat 08/05/23 04:20 PM

I think it's just a rouse to get women to look at your profile laugh tongue2

I'm assuming it's a John Deere? If so, that's where Johnny comes in. Haven't a clue about popper what
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Unknow

Sat 08/05/23 04:27 PM

Yes, the "Johnny" comes from John Deere.

Moto, PW, Slim, might know.
motowndowntown's photo

motowndowntown

Sat 08/05/23 05:20 PM

two-cylinder design made a distinctive sound that gave these tractors the nickname “Johnny Poppers.”

google is your friend
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Unknow

Sat 08/05/23 05:26 PM

Yes that is correct.... Google cheat :stuck_out_tongue_closed_eyes:.
So why do they make the particular sound?
It's because, 2 cylinder, 4 cycle,.....???

Google may not be so friendly with specific technical questions.
Edited by Unknow on Sat 08/05/23 05:44 PM
NotPay4Play's photo

NotPay4Play

Sat 08/05/23 08:20 PM

Or as I have heard it since I eas a kid "popping johny" precisely I wouldn't know. I would figure it could be a little back pressure by the off set of the timing. Kinda along the lines of the older harleys sounding at idle due to the twin carbs.
Edited by NotPay4Play on Sat 08/05/23 08:26 PM
motowndowntown's photo

motowndowntown

Sat 08/05/23 09:03 PM

I don't think Harleys ever had twin carbs. The reason they sound the way they do at idle is because of the way the crank shafts and firing order are set up.



And I would say that the "Popping Johnny" was a four stroke and "Popped" for the same reason a "hit and miss" engine does.
no photo

Unknow

Sat 08/05/23 09:28 PM

On 4cycle engines, it requires two full rotations of the crankshaft, 720°, to fire the cylinders, regardless of the number of cylinders. For a smooth running engine, the cylinders would fire equal degrees of rotation. 360° for 2 cyl, 180° for 4 cyl, 120° for 6 cyl, 90° for 8 cylinders.
The Johnny Popper cylinders fire somewhere around 3 1/2 ° apart, the old Harley engines are similar in that respect. When the cylinders fire that close, you hear "pop pop", delay of 716 1/2 ° crank rotation, then another "pop pop".
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Unknow

Sat 08/05/23 09:33 PM

I could be wrong on the 3 1/2°, been a long time since I've dealt with them, but for certain the cylinders fire very close together.
Ꮢ Ꭷ Ᏸ ɨ Ꮑ's photo

Ꮢ Ꭷ Ᏸ ɨ Ꮑ

Sat 08/05/23 11:33 PM

Dheere Dheer $e :tanabata_tree::seedling::seedling::tanabata_tree::leaves:

___:tractor:.............




Edited by Ꮢ Ꭷ Ᏸ ɨ Ꮑ on Sun 08/06/23 12:30 AM
Jaan Doh 's photo

Jaan Doh

Sun 08/06/23 02:55 AM

What lovely pics those are Robin...

In our little goat herder village in India, some farmers are still using bullocks cos they can't afford a tractor...

The goat herder inside me, wishes I had a tractor :tractor:...

I'd tractor around all the fields :joy: and chase the birds :bird:🤣

motowndowntown's photo

motowndowntown

Sun 08/06/23 09:10 AM


On 4cycle engines, it requires two full rotations of the crankshaft, 720°, to fire the cylinders, regardless of the number of cylinders. For a smooth running engine, the cylinders would fire equal degrees of rotation. 360° for 2 cyl, 180° for 4 cyl, 120° for 6 cyl, 90° for 8 cylinders.
The Johnny Popper cylinders fire somewhere around 3 1/2 ° apart, the old Harley engines are similar in that respect. When the cylinders fire that close, you hear "pop pop", delay of 716 1/2 ° crank rotation, then another "pop pop".


What about what's known as a "flat crank" as used in racing engines?

V8 engines vs straight 8s? v6 vs straight 6 etc.

Flat opposed cyl engines like old VWs or BMW bikes?
no photo

Etsin

Sun 08/06/23 02:04 PM

When one piston is at Top Dead Center and the other is 180° opposite at Bottom Dead Center, the pop pop pop pop you hear from a Johnny Popper is NOT left firing POP and right firing POP 180° later, the POP the human ear can recognize is the COMBINATION/ADDITION of BOTH firings (a quick 180° apart) followed by the relatively longer 540° coast cycle before the ear detects another POP. You don't hear POP POP then ---- ---- ---- (540°).
Rousseau's photo

Rousseau

Sun 08/06/23 03:15 PM


What lovely pics those are Robin...

In our little goat herder village in India, some farmers are still using bullocks cos they can't afford a tractor...

The goat herder inside me, wishes I had a tractor :tractor:...

I'd tractor around all the fields :joy: and chase the birds :bird:🤣


Rousseau's photo

Rousseau

Sun 08/06/23 03:16 PM

hello
no photo

Unknow

Sun 08/06/23 07:41 PM



On 4cycle engines, it requires two full rotations of the crankshaft, 720°, to fire the cylinders, regardless of the number of cylinders. For a smooth running engine, the cylinders would fire equal degrees of rotation. 360° for 2 cyl, 180° for 4 cyl, 120° for 6 cyl, 90° for 8 cylinders.
The Johnny Popper cylinders fire somewhere around 3 1/2 ° apart, the old Harley engines are similar in that respect. When the cylinders fire that close, you hear "pop pop", delay of 716 1/2 ° crank rotation, then another "pop pop".


What about what's known as a "flat crank" as used in racing engines?

V8 engines vs straight 8s? v6 vs straight 6 etc.Most engine designs follow the 720° divided by the number of cylinders. There are exceptions, the 1975 to 1977 Buick 231 v-6 was called an odd fire engine 120,90,150,120,90,150.That was due to the 90° block and opposing cylinders shared a crankshaft rod journal. 1978 and newer versions had individual rod journals, to get an even firing of 120°. GM & Ford inline 6, are even fire, guessing straight eights are even firing, oppoing cylinder engines (VW, Porsche, Corvair)... don't know.

Flat opposed cyl engines like old VWs or BMW bikes?