| Author | Message | ||
     Vsingle |
I am curious about the exact nature of a carb backfire on a Buell Blast. What is the mode of getting the combustion process on the wrong side of the intake valve? How does that happen? Is there more than one way it occurs? | ||
| Ezblast |
Das boot! | ||
| Vsingle |
How though? How does the burning air/fuel mixture travel backwards through the intake path? The intake valve is closed when the spark plug fires, even during full spark advance. Does the backfire ignition occur during valve overlap at the beginning of the intake stroke? | ||
| Gearheaderiko |
Uh, yes?! The backfire is not necessarily caused by spark. A "backfire" is generally an uncontrolled explosion of fuel. Better explained by someone else: http://en.m.wikipedia.org/wiki/Engine_knocking It could occur at any time (which technically wouldn't always be called a "backfire"). Sometimes through the carb, sometimes through the exhaust, sometimes contained in the cylinder. When It is caused by lean fuel its because there isn't enough fuel molecules pairing up with oxygen molecules to "fire" when "asked" to. A common occurrence when the engine is cold (or "Das Boot" is bad!). For me to try and explain engine theory beyond this is pointless. I won't do a good job and it will take forever!! | ||
| Gearheaderiko |
The above explanation hopefully answers your question about backfire when the spark is at the correct time. | ||
| Ezblast |
And still they argue. - Sigh..... EZ | ||
| Vsingle |
Who is arguing? | ||
| Gearheaderiko |
 | ||
| Vsingle |
Thanx 4 'splainin |
