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Tool Talk Discussion Forum

Do you know???????? quiz

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old

12-07-2004 18:22:45




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Ok here it is you have 5 engines, 1-1 cylinder,1=2 cylinder, 1-4 cylinder, 1-6 cylinder, and 1-V8 how many times does the crank shaft turn for each cylinder to fire on each of these engines. Lets see how many of you guys are good machinics and how many are just getting there. I was asked theis about 40 years ago and I didn't get it right but they teacher said at least I was getting there. No cheating I'll tell you guys the answer after I get a few post back. By the way all the engines are 4 strokes.

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Nolan

12-09-2004 05:52:46




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 Re: Do you know???????? quiz in reply to old, 12-07-2004 18:22:45  
1-cylinder
Two complete revolutions to get through all the cycles, but arguably zero revolutions to get the cylinder to fire, if one starts at the begining of the ignition firing sequence.

2-cylinder, inline
One complete revolution. Doesn't matter if they are ganged plugs or not, since you asked about the cylinder firing, not the spark plugs. This is based on the first cylinder firing at the zero mark. It will take us two complete revolutions to make the first cylinder fire again.

2-cylinder, opposed cylinder, offset throw
Same as an inline, one complete revolution.

2-cylinder, opposed cylinder, combined throw
180 degrees on the close firing sequence, 520 degrees are the distant firing sequence.

2-cylinder, v configured, combined throw
This is an uneven firing engine, which can be configured two different ways on ignition firing. So, the answer depends on which side of the engine we start with, and how it fires. It can be as close as the angle seperation between the two banks. Or it can be as far as 720 degrees (two throws) minus the cylinder bank separation angle.

4-cylinder, inline
Described normally as 2 complete revolutions, though it can be argued that it is technically 1.5 revolutions if we start from zero with the first cylinder firing.

4-cylinder, opposed cylinders, offset throw
Same as inline 4.

4-cylinder, v arangement
See 2-cylinder v- discussion. Add in variable for which cylinder we start and end with, specifically if we are crossing the engine to do it or ending on the same bank.

V-8
Same as above.

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Ludwig

12-08-2004 13:39:51




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 Re: Do you know???????? quiz in reply to old, 12-07-2004 18:22:45  
Think about the distributor cap. It sends fire to every cylinder every rotation...
How does it get interrupted for the other stroke?



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big fred

12-08-2004 14:42:02




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 Re: Do you know???????? quiz in reply to Ludwig, 12-08-2004 13:39:51  
Distributor runs off the camshaft, Lud. Only turns half the speed of the crank.



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Ludwig

12-09-2004 11:43:46




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 Re: Do you know???????? quiz in reply to big fred, 12-08-2004 14:42:02  
Thanks, dunno how I forgot that one...



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Ray M41

12-08-2004 13:36:51




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 Re: Do you know???????? quiz in reply to old, 12-07-2004 18:22:45  
look at your single cylinder engine setup the next time you have it apart. It fires every time the piston is at the top, even in the exhaust stroke.



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john in la

12-08-2004 16:14:51




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 Re: Do you know???????? quiz in reply to Ray M41, 12-08-2004 13:36:51  
You are correct but you are going to really confuse the people that got the question wrong by telling them that.



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Ray M41

12-08-2004 18:58:48




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 Re: Do you know???????? quiz in reply to john in la, 12-08-2004 16:14:51  
I hear you.
There are single cylinder engines that have the magneto driven from the camshaft. In that case yes it would fire every second revolution on the power stroke.
I was refering to the common engine with the magnets embeded in the flywheel. The pickup coil only senses a magnetic tug. It has no way of knowing if it is the compression stroke or the exhaust stroke.
Now lets hear it from the John Deere folks to explain the pop/compression-pop/exhaust-intake/exhaust-intake/compression cycle.

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Jay (ND)

12-08-2004 08:18:04




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 Re: Do you know???????? quiz in reply to old, 12-07-2004 18:22:45  
Whew - I passed.

Now can I have my gold star?



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old

12-08-2004 08:35:52




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 Re: Do you know???????? quiz in reply to Jay (ND), 12-08-2004 08:18:04  
Sure but you have to pick it up your self, and when you do I'll even give you a pat on the back. LOL



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thurlow

12-08-2004 06:28:09




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 Re: Do you know???????? quiz in reply to old, 12-07-2004 18:22:45  
In (some) modern educational facilities, there are no wrong answers, i.e. everyone gets a ribbon; I like the way Butcher thinks..... ...



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MarkB_MI

12-08-2004 03:29:25




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 Re: Do you know???????? quiz in reply to old, 12-07-2004 18:22:45  
I'm astonished at the number of WRONG answers you got. Some of the posts gave the wrong answer after you already said what the right answer is!

Maybe you should stick to questions this crew can answer, like "How many times has Britney Spears been married?" These technical questions are just too tough!



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TWO

12-08-2004 06:36:45




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 Re: Do you know???????? quiz in reply to MarkB_MI, 12-08-2004 03:29:25  
MarkB, the answer is TWO!!!!


Dug



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john in la

12-08-2004 06:29:09




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 Re: Do you know???????? quiz in reply to MarkB_MI, 12-08-2004 03:29:25  
Yes very surprised at the answers.
He gives you the answer in the question. A piston has 2 strokes per crank turn. 1 up 1 down.
A 4 stroke would turn 2 times. Does not matter how many cylinders. If you have more than one cylinder you will have more than one fire per every 2 crank turns though.
A 2 cyl would fire 1 time on every turn. 1 will fire this turn and the other will fire the next turn.
A 4 cyl would fire 2 times per turn.
A 8 cylinder would fire 4 times per turn. So if you want to know how often a cylinder fires it would be.
1 cyl every 2 turns
2 cyl once every turn. #1 will fire one turn 1 and #2 will fire on turn 2
4 cyl. once every half turn
6 cyl once ever 1/3 turn
8 cyl once every 1/4 turn

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Scott Green

12-08-2004 03:27:05




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 Re: Do you know???????? quiz in reply to old, 12-07-2004 18:22:45  
I say the amount of cylinders doesn't matter. by the time the crank shaft turns two times , all the cylinders have fired. My answer is (2).



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LumbrJakMan

12-08-2004 03:09:07




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 Re: Do you know???????? quiz in reply to old, 12-07-2004 18:22:45  
The answer is simply 2 times for EACH cylinder . The engine can have as many cylinders as you want . But on a 4 Stroke engine , every other stroke will be a Power stroek , and thats when it fires . so the answer is 2 turns if the crankshaft .



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Ludwig

12-08-2004 13:36:08




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 Re: Do you know???????? quiz in reply to LumbrJakMan, 12-08-2004 03:09:07  
So if its 2 rotations for each cylinder the crank has to rotate 16 times to fire all 8 cylinders in a v8? You don't think that maybe all 8 cylinders would fire in 2 rotations?



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ugly duck

12-08-2004 02:26:57




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 Re: Do you know???????? quiz in reply to old, 12-07-2004 18:22:45  
hi,old
you asked how many revolutions the crank turns for each cylinder to fire.
In a four stroke engine all the cylinders will
fire in 720 degrees. 1 cyl = 2 turns 2 cyl = 1 turn 4 cyl = 1/2 turn 6 cyl = 1/3 turn 8 cyl = 1/4 turn for each cyl to fire

ugly duck



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ss

12-07-2004 20:18:06




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 Re: Do you know???????? quiz in reply to old, 12-07-2004 18:22:45  
The number of cylinders doesn't matter on a 4 stroke engine,The crankshaft has to turn four times per firing of sparkplug.. This is called the"POWER" stroke



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old

12-07-2004 21:14:07




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 Re: Do you know???????? quiz in reply to ss, 12-07-2004 20:18:06  
go back to the back of the class. WRONG



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Joe (Wa)

12-07-2004 20:37:06




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 Re: Do you know???????? quiz in reply to ss, 12-07-2004 20:18:06  
In a four stroke cycle, one stroke is completed each 180 degs of crank travel. That adds up to 720 degs or 2 complete revolutions of the crankshaft to complete all four strokes.

But you are half right the nr of cylinders does not matter. They all fire in two revolutions of the crankshaft in a normal four stroke engine.

Joe



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Butcher

12-07-2004 19:32:21




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 Re: Do you know???????? quiz in reply to old, 12-07-2004 18:22:45  
1/2 turn



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Butcher

12-07-2004 19:11:01




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 Re: Do you know???????? quiz in reply to old, 12-07-2004 18:22:45  
Only 1 time.



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old

12-07-2004 19:21:43




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 Re: Do you know???????? quiz in reply to Butcher, 12-07-2004 19:11:01  
Go back to the back of the class. Wrong



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Best Guess

12-07-2004 18:50:26




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 Re: Do you know???????? quiz in reply to old, 12-07-2004 18:22:45  
If I was Bill Clinton I would ask you what is your definition of "fire". I think john Deere 2 cyls. fire the spark plugs every revolution but there's only gas there to ignite every second revolution.



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old

12-07-2004 19:03:25




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 Re: Do you know???????? quiz in reply to Best Guess, 12-07-2004 18:50:26  
Yes there are those few odd ball engines that fire sort of funny. I'm takling about the normal ones LOL



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Bob

12-07-2004 18:42:43




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 Re: Do you know???????? quiz in reply to old, 12-07-2004 18:22:45  
EACH cylinder fires every second revolution.

After 2 complete turns, the 1 cylinder engine will have fired it's single cylinder.

After 2 complete turns, the 2 cylinder engine will have fired both cylinders.

After 2 complete turns, the 4 cylinder engine will have fired 4 cylinders.

After 2 complete turns, the 6 cylinder engine will have fired 6 cylinders.

After 3 complete turns, the 8 cylinder engine will have fired 8 cylinders.

(Assuming, as stated by you, that they are all 4-cycle engines.)

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old

12-07-2004 18:46:46




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 Re: Do you know???????? quiz in reply to Bob, 12-07-2004 18:42:43  
Bob your right and wrong unless you had a type-o



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Best Guess

12-07-2004 18:36:52




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 Re: Do you know???????? quiz in reply to old, 12-07-2004 18:22:45  
Twice



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Bob

12-07-2004 18:43:45




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 Re: Do you know???????? quiz in reply to Best Guess, 12-07-2004 18:36:52  
Dangit, Guesser! You type too fast! (Or I typed too much!)



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Bob

12-07-2004 18:46:05




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 Re: Do you know???????? quiz in reply to Bob, 12-07-2004 18:43:45  
And, I see besides typing too much, I make typo's. The "8" cylinder line should read:

After [[2]] complete turns, the 8 cylinder engine will have fired 8 cylinders.



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old

12-07-2004 18:45:16




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 Re: Do you know???????? quiz in reply to Bob, 12-07-2004 18:43:45  
YES I do



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mike brown

12-08-2004 05:21:37




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 Re: Do you know???????? quiz in reply to old, 12-07-2004 18:45:16  
Four stroke engines, cylinders fire every other revolution so the answer is two. the number of cylinders divides those two revs. into smaller parts as the number of cylinders increases.
Degrees of crankshaft rotation per power stroke: (inline cylinder arrangement)
one cylinder=720
Four =180
six =60
eight =90

two =180 then 540

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