Do bigger cams need more timing?

The bigger the camshaft, the more it really needs part-throttle timing at low engine speeds.

Does cam affect timing?

Advancing or retarding a camshaft's timing from its original "zero" position causes the valve events to happen either earlier or later in the engine's cycle. A camshaft that is advanced four degrees will cause each opening and closing event to occur four degrees of rotation sooner than before.

What does putting a bigger cam do?

A bigger cam will open the intake valve wider, allowing more fuel and air into the cylinder. The larger the cam, the more fuel that is let in.

What happens if you advance timing too much?

If the spark timing is initiated too early, the cylinder may experience detonation and potentially cause damage. If the spark occurs too late, the engine runs flat, makes less power, and may overheat.

What will retarding timing do?

Retarding the timing means the plug fires later in the compression stroke (closer to TDC). Retarding the timing can help reduce Detonation. However, if the spark happens too late, you will lose power.

Camshaft - High Lift and Duration - Increase Horsepower

What are the symptoms of advanced timing?

Engine knock

One of the earliest symptoms of a problem with the automatic timing advance unit is engine knock. Engine knock occurs when the air-fuel mixture is ignited before the optimum timing, causing uneven combustion to occur.

What makes a cam sound choppy?

Registered. LSA (lobe separation angle) determines the choppiness, it has to do with the overlap of when both valves are open, as in when the exhaust valve is closing and the intake valve is opening to pull fresh fuel in on the intake stroke after pushing out the burnt fuel. Most GM cams come on a 112, 114 or 116 LSA.

How much HP does a Stage 1 cam add?

Most Stage 1 type modifications are typically in the +10-15% power increase over stock. Stage 2: this is typically referred to an engine with a performance cam upgrade as well as the other components within a Stage 1 combination. A typical Stage 2 has generally +20-25% more HP than stock.

What happens if cam timing is off?

If the engine timing of the cam is off, your car will either be running rough or not at all. If the ignition timing is the problem, it isn't as easy to notice because it has four cycles: Intake valve sucks in air while fuel is delivered by the injectors. The fuel mixture is reduced.

Should I advance my cam?

One way to improve the low-speed torque on a camshaft with too much duration is to advance the intake lobe in relation to the exhaust. Advancing just the intake lobe opens and closes the intake valve sooner which is one way to help improve the low-speed torque.

Can Cam Timing cause low compression?

If the camshaft timing is very wrong, it can also cause the valves to hit the pistons and bend them in most engines, which will cause no compression in your engine. If you have low compression on all cylinders, it is definitely time to check the camshaft timing.

How do you prevent engine detonation?

Does camshaft affect compression?

Overlap causes a "scavenging effect" as the engine RPM increases. This is why performance cams "come alive" at higher RPMs. It's not "just" the cam making the power, it's the cam's scavenging effect working as the RPM increases which increases cylinder pressure (dynamic or effective compression).

What is a Stage 3 camshaft?

The Stage 3 cam is designed to work with some larger valves, port work, and upgraded carburetor or EFI system. This cam starts moving the power band a little higher in the RPM range (2500-6000). This is the biggest cam we recommend for a street application.

What is a Stage 4 camshaft?

The Stage 4 grind is a popular choice for those looking to delete DOD/AFM, or just add some pep to your trucks step. With great power gains and driving characteristics, this camshaft works well with 2800-3200 stall torque converters.

What will a Stage 1 cam do?

Stage 1 cam sets are used to give increased Torque output in the RPM range below the engine's Torque peak. More part-throttle Torque, better low RPM throttle response, and increased peak Torque will be produced by these cams. Peak horsepower may also be improved in some cases.

What is considered an aggressive cam?

Most cam with a duration of over 220ish with lift in . 570+ range are considered aggressive ? Hey Keith..

What makes a cam sound lumpy?

what makes the cam have that lumpy sound? The overlap of the exhaust valve closing and intake valve opening causes the engine to be inefficient at low speed which results in the lumpy idle. The closer the Lobe Seperation Angle the more the overlap, the more duration the more (typically) the overlap.

What do more aggressive cams do?

A more aggressive cam will change the way the valves to open and close in a manner to facilitate more air flow, but you need the intake and exhaust side up to snuff to benefit from it. The cam also needs to be profiled to augment the engine setup, not hurt it.

What causes pinking?

Knocking (also called knocking, detonation, spark knock, pinging, or pinking in spark ignition internal combustion engines) occurs when combustion in the engine fails to occur by propagation of fuel or air in the cylinder that causes the engine to discharge flame (or emits smoke).

Is Advance timing before TDC?

Timing advance is required because it takes time to burn the air-fuel mixture. Igniting the mixture before the piston reaches TDC will allow the mixture to fully burn soon after the piston reaches TDC.

Will advanced timing cause rich?

If you advance your timming you will have to richin the fuel mixture, if you retard the timming then you would have to lean out your carb for it to run best.

Will compression be low if timing is off?

Yes the valve timing must be correctly set for a valid compression test. Compression happens as the piston moves up during the compression stroke AND the exhaust & intake valves are closed.