Random newbie engine questions
09-06-2006, 07:13 PM
#1
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Random newbie engine questions Hey guys,
As many of you, especially GuitsBoy, may know, I have this thing where every once in a while I have to ask those questions that everyone else seems to automatically know the answers to when they're as into the hobby as most of us are. Well, it's one of those times again where I have to ask these things. Here's one of my patented numbered lists that I've become so good at making...
1) This one has been bothering me for a while. When you have detonation in your engine, it's because the A/F mixture is detonating before the spark on its own due to a combination of the heat and the compression. If it's detonating before the spark, then why does retarding the timing of the spark cure detonation?
2) In a carbeurated engine does the A/F ratio stay relatively constant no matter what RPM or throttle it's at? If not, how does it vary?
3) What were the other questions that have been bothering me all day that I suddenly can't remember? I'm sure I'll post them up soon.
As many of you, especially GuitsBoy, may know, I have this thing where every once in a while I have to ask those questions that everyone else seems to automatically know the answers to when they're as into the hobby as most of us are. Well, it's one of those times again where I have to ask these things. Here's one of my patented numbered lists that I've become so good at making...
1) This one has been bothering me for a while. When you have detonation in your engine, it's because the A/F mixture is detonating before the spark on its own due to a combination of the heat and the compression. If it's detonating before the spark, then why does retarding the timing of the spark cure detonation?
2) In a carbeurated engine does the A/F ratio stay relatively constant no matter what RPM or throttle it's at? If not, how does it vary?
3) What were the other questions that have been bothering me all day that I suddenly can't remember? I'm sure I'll post them up soon.
09-06-2006, 08:44 PM
#2
Originally Posted by Gauge
Hey guys,
As many of you, especially GuitsBoy, may know, I have this thing where every once in a while I have to ask those questions that everyone else seems to automatically know the answers to when they're as into the hobby as most of us are. Well, it's one of those times again where I have to ask these things. Here's one of my patented numbered lists that I've become so good at making...
1) This one has been bothering me for a while. When you have detonation in your engine, it's because the A/F mixture is detonating before the spark on its own due to a combination of the heat and the compression. If it's detonating before the spark, then why does retarding the timing of the spark cure detonation?
2) In a carbeurated engine does the A/F ratio stay relatively constant no matter what RPM or throttle it's at? If not, how does it vary?
3) What were the other questions that have been bothering me all day that I suddenly can't remember? I'm sure I'll post them up soon.
As many of you, especially GuitsBoy, may know, I have this thing where every once in a while I have to ask those questions that everyone else seems to automatically know the answers to when they're as into the hobby as most of us are. Well, it's one of those times again where I have to ask these things. Here's one of my patented numbered lists that I've become so good at making...
1) This one has been bothering me for a while. When you have detonation in your engine, it's because the A/F mixture is detonating before the spark on its own due to a combination of the heat and the compression. If it's detonating before the spark, then why does retarding the timing of the spark cure detonation?
2) In a carbeurated engine does the A/F ratio stay relatively constant no matter what RPM or throttle it's at? If not, how does it vary?
3) What were the other questions that have been bothering me all day that I suddenly can't remember? I'm sure I'll post them up soon.
2. Carbs are usually decently accurate as air flow changes, except for during transients. There are other mechanical elements that help add extra fuel when the air flows faster than fuel flow can catch up. Check out http://en.wikipedia.org/wiki/Carburetor for more than you probably wanted to know.
3. The answer is eleventy billion. I too forgot the question.
09-06-2006, 09:45 PM
#3
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4) How exactly do you define a misfire? Simply no fire at all?
5) Can you give me a real specific definition of a spun bearing? Since I believe that bearings inside the engine are typically two parts, I assume they simply rotate around, but what makes that such a problem?
5) Can you give me a real specific definition of a spun bearing? Since I believe that bearings inside the engine are typically two parts, I assume they simply rotate around, but what makes that such a problem?
09-07-2006, 08:58 AM
#5
4) Yes...
5) Normally a bearing will stay in place as stated above, and the journal rides on a cushion of oil. If you take that cusion of oil out of the picture, now you have contact and friction. This chews up the bearing surface and usually results in teh contact spinning the bearings out of the original position it was installed in. The contact chews up the bearings resulting in metallic flakes in the oil.
5) Normally a bearing will stay in place as stated above, and the journal rides on a cushion of oil. If you take that cusion of oil out of the picture, now you have contact and friction. This chews up the bearing surface and usually results in teh contact spinning the bearings out of the original position it was installed in. The contact chews up the bearings resulting in metallic flakes in the oil.
