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/cgi-bin/YaBB.pl General Category >> Rubber Side Down! >> Spark per revolution? /cgi-bin/YaBB.pl?num=1445035696 Message started by DesertRat on 10/16/15 at 15:48:16 |
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Title: Spark per revolution? Post by DesertRat on 10/16/15 at 15:48:16 How many spark(s) per revolution do/does our bikes fire off per revolution? |
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Title: Re: Spark per revolution? Post by thumperclone on 10/16/15 at 15:54:16 one spark per one rev |
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Title: Re: Spark per revolution? Post by DesertRat on 10/16/15 at 16:02:54 thanks thumper :) |
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Title: Re: Spark per revolution? Post by Drestakil on 10/19/15 at 17:19:46 One spark for every 2 revolutions. |
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Title: Re: Spark per revolution? Post by justin_o_guy2 on 10/19/15 at 17:46:25 Every time the piston goes up. Just like a lawnmower. The mechanical stuff to fire the plug only when it's time is expensive. It's just wasting a spark.. |
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Title: Re: Spark per revolution? Post by DesertRat on 10/19/15 at 18:07:41 is it 1 or 2? I'm trying to hook up a one wire tach to check my idle rpm's and NEED that data for setup. |
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Title: Re: Spark per revolution? Post by Dave on 10/19/15 at 18:31:18 7B4D5A4C4B5E5456530E3F0 wrote:
Wrong....the ignition trigger is on the crank, and it tells the coil to spark every time the crank get to TDC. It doesn't know what the cam is doing, it just sparks every time the piston is at the top of the bore. |
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Title: Re: Spark per revolution? Post by Drestakil on 10/19/15 at 19:56:50 Then I guess you all have found another error in the Clymer Manual on page 69. I tend to believe the manual on this one. Edit: Page 215 -216 "The signal generator consists of a raised tab on the alternator rotor and a pickup coil attached to the alternator cover the alternator rotor is turned by the crankshaft,..." |
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Title: Re: Spark per revolution? Post by verslagen1 on 10/19/15 at 20:07:54 6452455354414B494C11200 wrote:
Would you mind reciting the exact phase, I seemed to have missed it. |
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Title: Re: Spark per revolution? Post by Drestakil on 10/19/15 at 20:14:16 6C7F6869767B7D7F742B1A0 wrote:
Would you mind reciting the exact phase, I seemed to have missed it.[/quote] I was referring to the diagram that shows 1 spark per rev. I'll admit that I don't know if the crank and the alternator are geared 1 to 1. |
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Title: Re: Spark per revolution? Post by Kris01 on 10/19/15 at 20:43:52 Read that paragraph again. The signal generator consists of a raised tab on the alternator rotor and a pickup coil attached to the alternator cover next to the alternator stator coil assembly. As the alternator rotor is turned by the crankshaft, the raised tab passes by the pickup coil and a signal is sent to the ignitor unit. Every time it makes 1 full revolution, a spark is generated. |
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Title: Re: Spark per revolution? Post by verslagen1 on 10/19/15 at 21:00:32 7B4D5A4C4B5E5456530E3F0 wrote:
Well, if you're going to take that diagram literally, take my word for it... the exhaust valve closes. |
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Title: Re: Spark per revolution? Post by Dave on 10/20/15 at 04:21:49 6D5B4C5A5D4842404518290 wrote:
7B4D5A4C4B5E5456530E3F0 wrote:
The rotor for the alternator is bolted directly to the left end of the crankshaft. It has to turn in a 1/1 ratio.....they are "united"! Every time the crankshaft turns the ignition system is triggered to produce a spark.....there is a spark made with every rotation. 1 spark for every revolution of the crankshaft. |
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Title: Re: Spark per revolution? Post by thumperclone on 10/20/15 at 04:49:48 this topic reminds me of the oil wars |
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Title: Re: Spark per revolution? Post by Dave on 10/20/15 at 05:26:33 524E534B564354454A494843260 wrote:
I know how to settle this: 1) Remove the spark plug and timing cover. 2) Place a 17mm socket and breaker bar on the right side of the crankshaft through the timing hole, and rotate the crankshaft until the TDC lines up. 3) Place the spark plug back into the wire connector and hold it tightly in your left hand. 4) With your right hand turn the ignition on, then using your right hand rotate the crankshaft brisky. 5) Record if you twitch violently on every revolution....or only once every two revolutions! ;) |
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Title: Re: Spark per revolution? Post by Drestakil on 10/20/15 at 05:32:05 4559445C415443525D5E5F54310 wrote:
Not really. I'm willing to admit that I was wrong. It happens quite a bit. Like when I used to think that 1 + 1 always equals 2. Nope, not in every case. |
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Title: Re: Spark per revolution? Post by Dave on 10/20/15 at 05:43:04 I can think of a way to resolve this somewhat peacefully. 1) Remove the spark plug and timing cover. 2) Place a 17mm socket and breaker bar on the left end of the crank through the timing cover access hole, and rotate the cranshaft until the timing marks are aligned...this is where the piston is at the top of the stroke. 3) Put the spark plug back into the wire, and grip the spark plug tightly in your left hand. 4) With your right hand turn on the ignition - then note the position of the breaker bar handle. Rotate the crankshaft briskly, and then take notice of whether you twitch violently with every rotation of the crankshaft - or just every 2nd rotation! ;) |
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Title: Re: Spark per revolution? Post by DesertRat on 10/20/15 at 06:47:00 665D5047565A41475C545946350 wrote:
I'm so NOT doing this, NOPE, NOPE, NOPE ... someone else can be the guinea pig. Maybe one of the young kids?!? |
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Title: Re: Spark per revolution? Post by old_rider on 10/20/15 at 06:48:22 That's just plain mean Dave ;D :o ;) I'm really sensitive to electric shock.... I would prolly pee my shorts every time it came around LOL :o |
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Title: Re: Spark per revolution? Post by justin_o_guy2 on 10/20/15 at 10:25:39 I knew a guy who was having lawnmower trouble . Didn't think it was getting spark. He pulled the wire, hollered at one of the kids, got him to hold it and yanked the cord. What he DIDN'T know was, his wife was watching through the kitchen window. Too bad no one had a stopwatch to time her from the window to in front of him. Probably had to refinish the floor,, |
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Title: Re: Spark per revolution? Post by Dave on 10/20/15 at 10:44:23 My uncle was working on a 1910 Stoddard Dayton car he has. It had not run in years, and he wanted to check the compression before he got too far along. The car has those massive spark plugs, and his compression gauge was the kind that has the big rubber tip and you have to hold it in the hole tightly. He had my aunt hold the compression gauge in the hole....while he grabbed the crank and turned the engine over (2 years before Charles Kettering developed the electric starter and put it in a Cadillac). Unfortunately he had the ignition switch on, and my aunt happened to be touching the spark plug wire while holding onto the gauge.....and the magneto made a spark and got her good. About 10 years has passed since that day - but if you bring up the subject she will still cuss like a sailor for a few minutes. |
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Title: Re: Spark per revolution? Post by justin_o_guy2 on 10/20/15 at 10:54:30 Magneto. = small bolt of lightning. |
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Title: Re: Spark per revolution? Post by Ultimafuego on 10/20/15 at 11:33:33 While I was in magneto class in my aviation school we used to hook up mags with impulse couplers to steel stools and waited till someone sat down. Kinda like a capacitor except you have to rotate it. Then across the room they go. |
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Title: Re: Spark per revolution? Post by Drestakil on 10/20/15 at 15:12:47 That shock is supposed to be good for snake bites but it's not a theory I'm overly anxious to test. |
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Title: Re: Spark per revolution? Post by Kris01 on 10/20/15 at 18:54:21 5563746265707A787D20110 wrote:
Ya gotta 'splain that one! |
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Title: Re: Spark per revolution? Post by justin_o_guy2 on 10/20/15 at 20:06:17 I think he got someone pregnant. 1+1=3... |
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Title: Re: Spark per revolution? Post by Drestakil on 10/21/15 at 05:12:30 5D647F652627160 wrote:
Ya gotta 'splain that one![/quote] It depends on what you're adding. If you have 1 pile of dirt to your left and 1 pile of dirt to your right, that's 2 piles of dirt. 1 and 1 equal 2. If you add the piles of dirt together, you end up with 1 bigger pile of dirt. 1 pile of dirt + 1 pile of dirt equal 1 pile of dirt. In this case, the only way 1 and 1 equal 2 is if you don't add them together. |
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Title: Re: Spark per revolution? Post by Drestakil on 10/21/15 at 06:12:22 Another thing I was taught wrong in grade school is that saying, "I'm sorry" is the same as saying, "I apologize." That's not true at a funeral. |
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Title: Re: Spark per revolution? Post by thumperclone on 10/21/15 at 06:40:35 6A515C4B5A564D4B5058554A390 wrote:
I know how to settle this: 1) Remove the spark plug and timing cover. 2) Place a 17mm socket and breaker bar on the right side of the crankshaft through the timing hole, and rotate the crankshaft until the TDC lines up. 3) Place the spark plug back into the wire connector and hold it tightly in your left hand. 4) With your right hand turn the ignition on, then using your right hand rotate the crankshaft brisky. 5) Record if you twitch violently on every revolution....or only once every two revolutions! ;)[/quote] ;D as a kid did something like that with a lawn mower |
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Title: Re: Spark per revolution? Post by Kris01 on 10/21/15 at 11:19:29 Drestakil, I love your analogies! ;D |
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Title: Re: Spark per revolution? Post by runwyrlph on 10/21/15 at 16:42:30 My Dad tells a story about a neighbor who used to have a truck with a flathead 4 cylinder engine (sparkplugs in a line across the top). This guy was known for being extra tough... Sometimes he'd show off by grounding all 4 plugs with his hands to stall out the running engine. It brought tears to his eyes, but he'd do it. I knew him when he was in his 80s and I was in my 20s- I would not have wanted to cross him! |
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Title: Re: Spark per revolution? Post by DesertRat on 10/21/15 at 19:31:14 7B6C727C7C70661F0 wrote:
that's one tough SOB :-? |
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