Quick Answer: What Is Initial Timing?

What is the correct timing for a Chevy 350?

The timing can vary between 2 and 12 degrees BTDC, the recommended spark plugs are different and even the plug gaps vary.

In most cases starting out with 12 degrees of initial advance is about right..

Does timing affect starting?

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.

What are the symptoms of bad timing?

Check out these symptoms of a bad or failing timing beltTicking noise coming from the engine. The timing belt is attached by way of a series of pulleys to the engine’s crank and cam shaft. … Engine won’t turn over. … Engine misfires. … Oil leaking from in front of the motor.

Can timing cause Dieseling?

Dieseling can occur for several reasons: … Similarly, hot vaporized oil gases from the engine crankcase can provide ample fuel for dieseling. Incorrect timing. An engine that runs too hot or too lean may produce an environment conducive to allowing unspent fuel to burn.

What rpm do you set timing at?

I like to set them up at about 3500 rpm for a typical street car. On the street with street gas you have to concern yourself with the worst case scenario which is heavy throttle detonation. You don’t gain anything with the timing fully advanced at 2000 rpm, but the engine will be closer to detonation under heavy load.

What is the difference between initial timing and total timing?

Initial timing refers to where the timing is set at an idle. This is also where you position the distributor when setting the timing. … For instance, a distributor may be set up to supply 21° of centrifugal advance. Total timing is the term given to the highest amount of advance.

How can I adjust timing without timing marks?

How to Set the Ignition Timing With No Timing MarksMark the spark plug wires for the cylinder number using a short piece of masking tape on each wire. … Rotate the engine clockwise and observe the valves on the number one cylinder. … Locate the number one spark plug wire on distributor cap and make a tic-mark of this position with a marker pen on the distributor housing.More items…

How do you set initial timing and total timing?

How is it set?Determine your desired total timing. … Set your Timing Light to your desired total timing.Start the engine. … Rev the engine past the point where your mechanical advance is fully engaged. … Watch the timing mark on the harmonic balancer using the timing light.More items…•

Can you set timing without 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.. tighten down the distributor..

Can timing cause hard start?

Hard Starting If ignition timing is incorrect and causes the spark plugs to fire too soon or too late, the fuel-and-air mixture will not be ignited at the proper time which will cause the engine to become difficult to start.

Does advancing timing increase 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 happens if you advance timing too much?

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.

How do you determine initial timing?

The amount of initial timing is determined by the amount of total timing required. The proper setting will also depend on the amount of Mechanical Advance provided by your distributor.