Quick Answer: What Should Timing Advance Be At Idle?

Will advance timing cause rich?

Not enough timing advance will only cause knock if you are already running too rich causing knock.

So that kind of goes hand in hand.

Bear in mind that while a leaner mixture can allow more timing, a leaner mixture also creates more heat, causing that extra timing to make some knock..

Does timing affect air fuel ratio?

Altering the timing does not affect the AFR of the cylinder. The AFR from a carby is not able to be affected by whatever timing you put into a cylinder, it may be affected by the air flow change due to VE changing with timing etc but thats a different issue. That change is due to fuel curve considerations.

How do you set ignition timing by ear?

Timing by ear simply eliminates the sometimes tedious first step of getting the timing close. When I do mine, I set the idle to about 1500 rpm and rotate the distributor until I get maximum rpm. I then retard it slightly until I get a 100 rpm drop and then take it out for a test drive.

How do I know if my ignition timing is too advanced?

Symptoms of incorrect ignition timing are poor fuel economy, sluggish acceleration, hard starting, backfiring, or “pinging” or “spark knock”. Too little spark advance will cause low power, bad gas mileage, backfiring, and poor performance. Too much advance will cause hard starting and pre-ignition.

Will an engine run if timing is 180 degrees off?

If you are exactly 180 degrees out when the plug fires you will have open valves, which could get a bit messy as well as noisey since any unburnt fuel in the cylinder would get ignited. I can’t imagine it would even try to start since there is now way it would get any compression.

Is it better to run lean or rich?

Running lean can give you more power but to lean will blow your engine. Running too rich can also hurt your motor. Think of it when you are mixing gas for your weed wacker. It is always safe to add a little more oil than not enough to the mixture.

Does advancing timing raise idle?

If the base timing is retarded 5 degrees from spec the engine will become lazy, and harder to start. It will produce less power(torque) off idle and rev slower. Advance timing, and response increases, easier to start, more power(torque) off idle. … Some engines use the vacuum advance to advance timing at idle.

What should ignition timing be at idle?

Idle/staging is typically 55 degrees to ignite the cylinders with a rich idle mixture. Launch typically 50-53 degrees adjusted for an optimum power at launch. Sudden drop of the timing to typically 36 degrees, approx.

Can you set timing without a timing light?

to set your base timing without a light, you just turn the motor over in it’s normal direction of rotation until the mark lines up with where you want it.. loosen up the distributor and hook up a spare spark plug to the #1 plug wire.. turn the distributor until it sparks..

Should I advance my cam 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. … On the other hand, if the camshaft timing is retarded, the intake valve will close later (usually sometime during the compression stroke).

Can timing cause hard start?

Usually, hard starting occurs when the ignition timing is too advanced, not retarded. An overly advanced condition will cause backfire through the carb and overly retarded will cause backfire through the exhaust. If you are not using a timing light, I would recommend that you do so.

What should my timing advance be?

“Timing advance” refers to the number of degrees before top dead center (BTDC) that the spark will ignite the air-fuel mixture in the combustion chamber during the compression stroke. … Ideally, the time at which the mixture should be fully burnt is about 20 degrees ATDC.

Does advancing timing lean or rich?

Yet, while cruising at light throttle loads, igniting the charge early is exactly what occurs on a fuel-efficient hot rod with vacuum advance ignition timing. Leaner air/fuel mixtures, those that occur during idle and light throttle loadings, have a shorter burn time than rich air/fuel mixtures.

Does advancing timing Increase temperature?

It can also be seen that advancing the timing increases the peak temperature (see Fig. 16.18) achieved during combustion, but tends to decrease the release temperature, while retarding reduces the peak temperature but increases the release temperature.

What happens when engine 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.

What are the symptoms of bad timing?

Symptoms of a Bad or Failing Timing BeltYou Hear A Ticking Noise Coming From The Engine. … Your Car’s Engine Won’t Turn Over. … You Notice An Oil Leak Near The Motor. … You Experience Exhaust Issues. … Your Revs Start Acting Up.

Does vacuum advance work at idle?

Plugging your vacuum advance into a direct source will allow it to engage at idle, which is good for a number of reasons. Much like cruise conditions, engines run leaner at idle than they do under load. Again, this means the mixture burns slower and needs an earlier spark to optimize the burn.

Can timing cause lean?

If the timing is too low it might read falsely lean. But you would probably notice backfiring and powerloss by that time. Timing will not affect air fuel ratio.

What does advancing and retarding timing do?

Advancing or retarding the cam pushes the centerline of the camshaft to one side or the other of the crankshaft centerline. This changes the Timing of the valve opening and closing events, in relation to the position of the piston in the cylinder.

What does it mean to advance timing?

Advancing the timing means the plug fires earlier in the compression stroke (farther from TDC). Advance is required because the air/fuel mixture does not burn instantly. It takes time for the flame to ignite the all the mixture. However, if the timing is advanced too far, it will cause an Engine Knock.

What happens if ignition timing is too advanced?

If ignition timing is too far advanced, it will cause the fuel-and-air mixture to ignite too early in the combustion cycle. This can cause the amount of heat generated by the combustion process to increase and lead to overheating of the engine.

What will too much timing do?

Too much timing can cause serious engine damage, so it’s best to be an informed tuner. … If the spark occurs too late, the engine runs flat, makes less power, and may overheat. This discussion will focus on a typical distributor-equipped street engine running pump gas.

How much ignition timing is too much?

There is no such thing as too much ignition timing. The terminology for petrol engines with spark plugs is degrees before top dead centre, or degrees after top dead centre. So the question comes down to – too much retardation, or too much advance. Retarded ignition would not enable the engine to achieve maximum rpm.