What is bucking?

[ABMLS3]

I've been searching up a lot about cams and I've seen people talking about bucking, what exactly is that? I think I have a clue but I'm not really sure. Can someone explain

[motorhead]

Turn up you volume. you'll get the picture.

[Muddflap]

If you have an M6 the best example I can give you is to just ease out on you clutch and not give any throttle. Just let the car roll if you are on flat ground or a slight incline you will feel the car surging/buckling. With a bigger cam you will feel this at higher RPM's as well. Sometimes up to 1600-1800 rpm's. so to prevent this at low speeds you have to work your clutch alot so it doesn't buck and people looking will just think you don't know how to drive a standard. To some this is very annoying. To others they know how to slip and ride the clutch to prevent this and its not an issue.

[hunter1660]

Not smooth...as in riding a horse vs. riding a bucking bronco

[ABMLS3]

So it's basically the car surging while your driving which makes it like bounce?

[Muddflap]

Yes

[ABMLS3]

Okay thanks

[PalmerGA]

Originally Posted by hunter1660

Not smooth...as in riding a horse vs. riding a bucking bronco

Of course, when you put the cam to work by getting on the pedal, it'll smooth out.

Man - that Caddy was ready to rock!

[christianchevell]

bucking is caused by the car warming up and trying to get the air fuel mixture right....its different from lope which is caused by cams...This videos shows cars which are cold and trying to operate and they do not have the carburation used on many cars...in the old days you had a spring which would be a thermostatic operation part enclosed on the top of the intake that operates a rod going to the butterfly on the carburetor holding it in a position until the car warmed up and the spring expanded as metal does with heat allowing the carb to flow more air to the gas.....yes this effectively chokes it.....( these still come on many carburetors ) And there were and are manual chokes but you cannot just change a jet in a carb or just want to jump out and turn a screw on the carb every time to turn the car on because you are running a high performance engine cold that is surging. Large cammed cars engines have a definitive lope and do surge from being cold........ But it is not just due to the cam's radical design or who would want one...... its from being cold...... Our cars have a computer to effective limit the amount of surge...or bucking if you want to call it that by controlling the air fuel mixture to be more in line with a cold engine. A warmer engine atomizes the gasoline better, as with carbureted cars the jets that control the fuel flow are a set size and cannot adjust like a pressurized fuel system such as individual fuel injectors controlled by computer......... SO cold air and a cold engine make it hard for the car to atomize the gas and less able to use the gas it has supplied to itself through the jets of the carburetor until the engine warms up..... On my old hot rods I would always have to adjust the carburetors for hot and cold weather (also to make the idle right in rpm's), turn screws to alter the flow through the jets .......( or turn up flow for colder denser air by turning the screw out ,or hotter less dense air requires turning the jet mixture screw in to make less gas flow) thus maintaining a good idle.
Just a little something from a old hot rodder................ I would have to adjust my engines carburetors twice per year for summer or winter driving if lucky. Usually 1/2 a turn for a carter afb type or holley per screw per primary ( the screw is really a pointed bolt limiting the fuel flow through a channel in the carburetor which is the jet) and fuel jets take time to change in a carburetor thus the need for the engine to warm up or the person driving to get out and make a slight adjustment to the carb to make the car not surge like in the video then they would want to return the carb to its original position after the car is warmed up. That is the sound of the surging you hear in the video not someone bucking as the bucking is caused by the surging if they do not have the car warmed up and it causes rushes of power as the engine cycles through the having the wrong to the right amounts of fuel as it tries to purge the extra gas in the combustion cycle when it has extra gas being cold then it is hard to control the clutch when the car surges with power off and on and off and on........... Like someone who does not know how to use a clutch. Like a bucking bronco. Many old rodders would do a neat trick with putting a spark plug in the exhust pipe connected to coil in the trunk that's fed power by a switch in the cab to ignite extra unspent gas making flames shoot out the exhaust, some would even do it with the engine warm by a really small interruption of the engines plugs firing to make even more unburnt gasoline come out the exhaust, ( small is like a few revolutions at 600-700 rpm). Well enough rambling, happy motoring

[AdamEL]

Originally Posted by christianchevell

bucking is caused by the car warming up and trying to get the air fuel mixture right....its different from lope which is caused by cams...This videos shows cars which are cold and trying to operate and they do not have the carburation used on many cars...in the old days you had a spring which would be a thermostatic operation part enclosed on the top of the intake that operates a rod going to the butterfly on the carburetor holding it in a position until the car warmed up and the spring expanded as metal does with heat allowing the carb to flow more air to the gas.....yes this effectively chokes it.....( these still come on many carburetors ) And there were and are manual chokes but you cannot just change a jet in a carb or just want to jump out and turn a screw on the carb every time to turn the car on because you are running a high performance engine cold that is surging. Large cammed cars engines have a definitive lope and do surge from being cold........ But it is not just due to the cam's radical design or who would want one...... its from being cold...... Our cars have a computer to effective limit the amount of surge...or bucking if you want to call it that by controlling the air fuel mixture to be more in line with a cold engine. A warmer engine atomizes the gasoline better, as with carbureted cars the jets that control the fuel flow are a set size and cannot adjust like a pressurized fuel system such as individual fuel injectors controlled by computer......... SO cold air and a cold engine make it hard for the car to atomize the gas and less able to use the gas it has supplied to itself through the jets of the carburetor until the engine warms up..... On my old hot rods I would always have to adjust the carburetors for hot and cold weather (also to make the idle right in rpm's), turn screws to alter the flow through the jets .......( or turn up flow for colder denser air by turning the screw out ,or hotter less dense air requires turning the jet mixture screw in to make less gas flow) thus maintaining a good idle.
Just a little something from a old hot rodder................ I would have to adjust my engines carburetors twice per year for summer or winter driving if lucky. Usually 1/2 a turn for a carter afb type or holley per screw per primary ( the screw is really a pointed bolt limiting the fuel flow through a channel in the carburetor which is the jet) and fuel jets take time to change in a carburetor thus the need for the engine to warm up or the person driving to get out and make a slight adjustment to the carb to make the car not surge like in the video then they would want to return the carb to its original position after the car is warmed up. That is the sound of the surging you hear in the video not someone bucking as the bucking is caused by the surging if they do not have the car warmed up and it causes rushes of power as the engine cycles through the having the wrong to the right amounts of fuel as it tries to purge the extra gas in the combustion cycle when it has extra gas being cold then it is hard to control the clutch when the car surges with power off and on and off and on........... Like someone who does not know how to use a clutch. Like a bucking bronco. Many old rodders would do a neat trick with putting a spark plug in the exhust pipe connected to coil in the trunk that's fed power by a switch in the cab to ignite extra unspent gas making flames shoot out the exhaust, some would even do it with the engine warm by a really small interruption of the engines plugs firing to make even more unburnt gasoline come out the exhaust, ( small is like a few revolutions at 600-700 rpm). Well enough rambling, happy motoring

That's great knowledge!

I was just doing some research on here earlier tonight on this same subject. I've noticed when I first take my SS on the road each morning, it will buck in 1st and sometimes 2nd gear. But only on the very first time I shift. But after that first initial shift through to 4th, it never does it again. So I've had to take off pretty slow in the mornings to let it get woken up. I saw on here where tons of people said they had the same issue. And several guys answered back saying that it was just the engine warming up. Makes sense to me. That's a big ass engine. She needs a little time to wake up in the morning... Just like me!

[ChrisBlair]

Originally Posted by christianchevell

bucking is caused by the car warming up and trying to get the air fuel mixture right....its different from lope which is caused by cams...This videos shows cars which are cold and trying to operate and they do not have the carburation used on many cars...in the old days you had a spring which would be a thermostatic operation part enclosed on the top of the intake that operates a rod going to the butterfly on the carburetor holding it in a position until the car warmed up and the spring expanded as metal does with heat allowing the carb to flow more air to the gas.....yes this effectively chokes it.....( these still come on many carburetors ) And there were and are manual chokes but you cannot just change a jet in a carb or just want to jump out and turn a screw on the carb every time to turn the car on because you are running a high performance engine cold that is surging. Large cammed cars engines have a definitive lope and do surge from being cold........ But it is not just due to the cam's radical design or who would want one...... its from being cold...... Our cars have a computer to effective limit the amount of surge...or bucking if you want to call it that by controlling the air fuel mixture to be more in line with a cold engine. A warmer engine atomizes the gasoline better, as with carbureted cars the jets that control the fuel flow are a set size and cannot adjust like a pressurized fuel system such as individual fuel injectors controlled by computer......... SO cold air and a cold engine make it hard for the car to atomize the gas and less able to use the gas it has supplied to itself through the jets of the carburetor until the engine warms up..... On my old hot rods I would always have to adjust the carburetors for hot and cold weather (also to make the idle right in rpm's), turn screws to alter the flow through the jets .......( or turn up flow for colder denser air by turning the screw out ,or hotter less dense air requires turning the jet mixture screw in to make less gas flow) thus maintaining a good idle.
Just a little something from a old hot rodder................ I would have to adjust my engines carburetors twice per year for summer or winter driving if lucky. Usually 1/2 a turn for a carter afb type or holley per screw per primary ( the screw is really a pointed bolt limiting the fuel flow through a channel in the carburetor which is the jet) and fuel jets take time to change in a carburetor thus the need for the engine to warm up or the person driving to get out and make a slight adjustment to the carb to make the car not surge like in the video then they would want to return the carb to its original position after the car is warmed up. That is the sound of the surging you hear in the video not someone bucking as the bucking is caused by the surging if they do not have the car warmed up and it causes rushes of power as the engine cycles through the having the wrong to the right amounts of fuel as it tries to purge the extra gas in the combustion cycle when it has extra gas being cold then it is hard to control the clutch when the car surges with power off and on and off and on........... Like someone who does not know how to use a clutch. Like a bucking bronco. Many old rodders would do a neat trick with putting a spark plug in the exhust pipe connected to coil in the trunk that's fed power by a switch in the cab to ignite extra unspent gas making flames shoot out the exhaust, some would even do it with the engine warm by a really small interruption of the engines plugs firing to make even more unburnt gasoline come out the exhaust, ( small is like a few revolutions at 600-700 rpm). Well enough rambling, happy motoring

My '70 Buick has a high lift cam in the 462 and its carbureted but with my electric choke, she never bucks

My '12 1SS does this sometimes though, cold, warm, doesn't matter. My '07 Solstice GXP did it before the upgrade, too