Timing

Negative ignition timing vs valve exotherm temperature

Negative ignition timing vs valve exotherm temperature
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  • Vovich Mechanicovich
  1. Does advancing timing Increase temperature?
  2. What does negative ignition timing mean?
  3. What happens if ignition timing is too advanced?
  4. How do I know which ignition timing is best?
  5. Will car overheat if timing is off?
  6. How do I know if my ignition timing is too advanced?
  7. What should ignition timing be at idle?
  8. Is negative timing bad?
  9. What should timing advance be at idle?
  10. Will advance timing cause rich?
  11. Does advancing timing raise idle?

Does advancing timing Increase temperature?

Advancing ignition timing increases engine temperatures. As you increase towards MBT you get more power but temperatures may get so high that you melt a through the combustion temperature + compression increasing temperatures.

What does negative ignition timing mean?

I normally refer to ignition timing as "ignition timing advance". Eg degrees before TDC. So a negative value would be degrees after TDC. Eg -90 would fire 90 degrees after TDC. –

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 do I know which ignition timing is best?

That is typically 15-35 degrees before TDC (top dead center) of the power stroke depending on the engine speed. Best power is achieved when ignition timing is set to fire the spark ahead of time to reach that peak pressure at about 2 degrees after TDC.

Will car overheat if timing is off?

Late timing alone doesn't cause an engine to overheat by more than a few degrees, but when coupled with other problems, it can bring the engine temperature to a critical point.

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.

What should ignition timing be at idle?

As a rough guide, most engines will idle at around 10-20* of timing, so if you're simply trying to get the engine running, you could block change (select the cells and use the '=' key) the entire top left area to 15*.

Is negative timing bad?

Negative timing is not good, and can cause headers/ex manifolds to glow, or be too hot, and or super high EGT's. If it gets too bad, it can be bad on the seals in the head too.

What should timing advance be at idle?

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

Will advance timing cause rich?

Thanks!! 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 advancing timing raise idle?

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.

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