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.
What should the timing be on a production engine?
A standard production engine has to run acceptably well over a wide range of operating conditions, poor fuel, towing of trailers/caravans etc. and yet still deliver good economy and flexibility. Consequently the engine is tuned to give good low down performance and will use conservative timing and fuelling settings.
What happens to ignition timing as engine speed increases?
As the engine speed (RPM) increases, the time available to burn the mixture decreases but the burning itself proceeds at the same speed, it needs to be started increasingly earlier to complete in time. Poor volumetric efficiency at higher engine speeds also requires increased advancement of ignition timing.
What’s the best static timing for an engine?
To achieve this the engine pulley needs to be marked at TDC (most already are), at the position for desired static timing (between 10 and 20 degrees depending on cam) and at the maximum advance position.
When to change ignition timing for maximum power?
Optimum timing from a fixed (locked) ignition advance occurs at only one engine speed. Ignition timing is too advanced at engine speeds below that and not advanced enough at engine speeds above that. Changing the timing value up or down changes the engine speed up or down for the optimum ignition timing.
What’s the best timing for a supercharged car?
Suspecting elevated boost levels, we started out with very conservative timing values. As with the turbo testing, the supercharged motor also featured an air-to-water intercooler and race fuel to eliminate any chance of detonation. Starting at 15 degrees of total timing resulted in peak numbers of 462 hp and 453 lb-ft of torque.
What’s the ignition timing for a Drag Race Engine?
Ignition timing is a tuning tool for professional Top Fuel drag race engine builders. The spark advance in a 10,000+ hp nitro-burning engine is typically as follows: 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.
How does engine speed affect the timing advance?
The engine speed operating range affects where the timing is the best. Increasing the timing advance raises the high-end power, reducing the low-end. Decreasing the timing advance raises low-end power, reducing the high-end.