Dash Pot?
06-25-2013, 04:38 PM
#3
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The injectors spray liquid gasoline, but the engine uses only gasoline vapor. A small amount of the sprayed gasoline clings to the inside of the intake manifold, but at steady state (driving down the road), that gasoline is evaporating as fast as it is getting replaced.
To go from idle to steadily running, it has to build up that thin layer of liquid gas. On a carbureted engine, you have an "accelerator pump." On a fuel injected engine, the injectors stay open a hair longer when the throttle opens.
But what happens when you slam the throttle closed? Not much air, but a bunch of liquid gas evaporating into the intake stream. So the mixture goes very rich, back fires through the exhaust, and ruins the air we breath. So all engines (carbureted or injected) have something to keep the throttle from slamming shut.
If you lose the dashpot, whenever you jump off the throttle you'll dump a bunch of unburned fuel into the exhaust, which isn't good for anything. You can get around it by always closing the throttle gently, but why worry about that when a little gadget will do it for you?
Yes, it's important. Now you know why.
To go from idle to steadily running, it has to build up that thin layer of liquid gas. On a carbureted engine, you have an "accelerator pump." On a fuel injected engine, the injectors stay open a hair longer when the throttle opens.
But what happens when you slam the throttle closed? Not much air, but a bunch of liquid gas evaporating into the intake stream. So the mixture goes very rich, back fires through the exhaust, and ruins the air we breath. So all engines (carbureted or injected) have something to keep the throttle from slamming shut.
If you lose the dashpot, whenever you jump off the throttle you'll dump a bunch of unburned fuel into the exhaust, which isn't good for anything. You can get around it by always closing the throttle gently, but why worry about that when a little gadget will do it for you?
Yes, it's important. Now you know why.
10-04-2013, 07:33 AM
#4
The injectors spray liquid gasoline, but the engine uses only gasoline vapor. A small amount of the sprayed gasoline clings to the inside of the intake manifold, but at steady state (driving down the road), that gasoline is evaporating as fast as it is getting replaced.
To go from idle to steadily running, it has to build up that thin layer of liquid gas. On a carbureted engine, you have an "accelerator pump." On a fuel injected engine, the injectors stay open a hair longer when the throttle opens.
But what happens when you slam the throttle closed? Not much air, but a bunch of liquid gas evaporating into the intake stream. So the mixture goes very rich, back fires through the exhaust, and ruins the air we breath. So all engines (carbureted or injected) have something to keep the throttle from slamming shut.
If you lose the dashpot, whenever you jump off the throttle you'll dump a bunch of unburned fuel into the exhaust, which isn't good for anything. You can get around it by always closing the throttle gently, but why worry about that when a little gadget will do it for you?
Yes, it's important. Now you know why.
To go from idle to steadily running, it has to build up that thin layer of liquid gas. On a carbureted engine, you have an "accelerator pump." On a fuel injected engine, the injectors stay open a hair longer when the throttle opens.
But what happens when you slam the throttle closed? Not much air, but a bunch of liquid gas evaporating into the intake stream. So the mixture goes very rich, back fires through the exhaust, and ruins the air we breath. So all engines (carbureted or injected) have something to keep the throttle from slamming shut.
If you lose the dashpot, whenever you jump off the throttle you'll dump a bunch of unburned fuel into the exhaust, which isn't good for anything. You can get around it by always closing the throttle gently, but why worry about that when a little gadget will do it for you?
Yes, it's important. Now you know why.
10-04-2013, 01:17 PM
#6
Did you read this?
The injectors spray liquid gasoline, but the engine uses only gasoline vapor. A small amount of the sprayed gasoline clings to the inside of the intake manifold, but at steady state (driving down the road), that gasoline is evaporating as fast as it is getting replaced.
To go from idle to steadily running, it has to build up that thin layer of liquid gas. On a carbureted engine, you have an "accelerator pump." On a fuel injected engine, the injectors stay open a hair longer when the throttle opens.
But what happens when you slam the throttle closed? Not much air, but a bunch of liquid gas evaporating into the intake stream. So the mixture goes very rich, back fires through the exhaust, and ruins the air we breath. So all engines (carbureted or injected) have something to keep the throttle from slamming shut.
If you lose the dashpot, whenever you jump off the throttle you'll dump a bunch of unburned fuel into the exhaust, which isn't good for anything. You can get around it by always closing the throttle gently, but why worry about that when a little gadget will do it for you?
Yes, it's important. Now you know why.
To go from idle to steadily running, it has to build up that thin layer of liquid gas. On a carbureted engine, you have an "accelerator pump." On a fuel injected engine, the injectors stay open a hair longer when the throttle opens.
But what happens when you slam the throttle closed? Not much air, but a bunch of liquid gas evaporating into the intake stream. So the mixture goes very rich, back fires through the exhaust, and ruins the air we breath. So all engines (carbureted or injected) have something to keep the throttle from slamming shut.
If you lose the dashpot, whenever you jump off the throttle you'll dump a bunch of unburned fuel into the exhaust, which isn't good for anything. You can get around it by always closing the throttle gently, but why worry about that when a little gadget will do it for you?
Yes, it's important. Now you know why.
10-04-2013, 11:32 PM
#7
Registered User
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