What Should Timing Be Set At On BBC?

What should my timing be set at?

Total timing is a combination of your initial timing (on the crank) and the amount of mechanical advance you get from your distributor.

Most naturally aspirated engines like a total timing of 34 to 36 degrees BTDC, (Before Top Dead Center) AKA “Advance”..

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.

How much vacuum advance is too much?

The maximum is about 14 degrees of vacuum advance. If too much advance is added, the engine will either start to knock or ping or perhaps it may surge slightly at very light throttle opening with high vacuum.

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.

What RPM set initial timing?

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.

How do you set the timing on a distributor 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..

How do you know if timing is 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.

How do I set timing on BTDC?

ProcedureRotate the engine to TDC on the Compression Stroke of the #1 cylinder. … Install the Degree Wheel on the crankshaft and set it to zero.Turn the crank backwards until the degree wheel reads 10 degrees BTDC.Align the distributor rotor with the cap location for the #1 spark plug wire.More items…•

What should the timing be set at on a 454?

The timing on stock 396, 402, 427 and 454 engines is 32-34 degrees total advance at 3500 rpm. This is for an engine with stock camshaft, heads, stroke, and a compression ratio of 10:1. The high-performance versions are slightly higher with a maximum advance of 38 degrees on premium fuel, if the camshaft warrants it.

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.

What are the symptoms of a bad timing?

Symptoms Of A Failing Or Broken Timing BeltYou Hear Odd Noises Coming From The Engine. … Your Check Engine Light Is On And Flashing. … Your Car Starts Hard And Occasionally Misfires. … You Notice A Loss Of Power And Your Car Runs Or Idles More Roughly Than Normal.

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.

How do you adjust the timing on a distributor?

To adjust your timing, all you need to do is turn the distributor housing one direction or the other, depending on whether or not you want to advance or move back the timing. If the rotor turns clockwise, you’ll advance the timing by rotating the distributor counterclockwise, and vice versa.

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.

What should timing advance be at idle?

In addition, the WSM says spark advance should be between 6 to 18 degrees BTDC at idle.

How do I set total time on BBC?

Shoot timing light at damper, and turn knob on back of gun (or push button) untill the line on damper lines up with the 0/TDC mark on timing tab… Now read the number the gun’s knob is sitting on… That is your total timing.

What happens if you advance timing too much?

With excessive advance, the engine will be prone to pinging and detonation when conditions change (fuel quality, temperature, sensor issues, etc). After achieving the desired power characteristics for a given engine load/rpm, the spark plugs should be inspected for signs of engine detonation.

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.