How does ignition timing affect temperature?

How does ignition timing affect 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. Effect of ignition timing on temperature–crank angle diagrams.

How is valve timing and ignition timing different?

Cam timing is VALVE timing. Ignition timing is SPARK timing. If your engine likes 36 degrees of total timing, then that’s where you set the timing at, whether the cam is 2 degrees retarded, 4 degrees advanced, or straight-up, it makes zero difference because neither have anything to do with each other.

What is negative ignition timing?

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.

Is negative ignition timing bad?

When you first nail the gas it can cause knock or at least the engine thinks it heard a knock. If the negative corrections are sustained or increase as the RPM goes up that is bad for power production.

What should ignition timing be at idle?

between 5-20 degrees
Most engines have between 5-20 degrees of ignition advance at idle. This is referred to as initial timing.

What should timing advance be at idle?

Most engines have between 5-20 degrees of ignition advance at idle.

What rpm do you set timing at?

Rev the engine past the point where your mechanical advance is fully engaged. (Usually, 3,000 – 3,500 rpm will do it.) Watch the timing mark on the harmonic balancer using the timing light. Rotate the distributor until the timing mark lines up at zero with the light.

What happens when the timing of ignition is too far advanced?

[&Ignition&] [&timing&] which is too far advanced will leave the flame in contact with the piston, valves and heads for a longer duration on each combustion cycle because the valve train controls when the [&exhaust&] opens and [&ignition&] [&timing&] doesn’t [&change&] that end of the process.

What should the ignition timing be for nitro fuel?

Nitro fuels run a lot more fuel volume and, as a result, need more timing. Example: For a blown alcohol engine on low percentages of nitro at a low level of enrichment, 40 degrees of timing was typical. On high percentages of nitro at a high level of enrichment, 55 degrees of timing was typical.

Which is the best ignition timing for a blown gasoline engine?

Example: For blown gasoline at around 2 atmospheres, 28 degrees of ignition timing is common for best power. For the same blown engine on alcohol at a richer mixture, 32 degrees of timing is common. Example: One methanol combustion engineering test measured a 22% reduction in methanol flame speed for a 19% increase in fuel enrichment.

When was electronic control of ignition timing introduced?

Electronic control of ignition timing was introduced a few years later in 1975-’76 with the introduction of Chrysler’s computer-controlled “Lean-Burn” electronic spark advance system. By 1979 with the Bosch Motronic engine management system, technology had advanced to include simultaneous control of both the ignition timing and fuel delivery.