Capacitive Discharge?
01-05-04, 05:31 PM
#3
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Capacitive discharge (CD) ignitions are commonly used for racing applications where the engine must operate at high RPM. The spark output of a CD system is characterized by a relatively short but very intense spark that is well matched to the requirements of high performance engines.
01-05-04, 06:13 PM
#4
84SE-EGI helpy-helperton
A capacitor is a place to store energy before it is released, in this case, in the form of a high heat spark to ignite air/fuel in the engine.
Capacitive discharge is the ignition system that uses a standard coil and a computer controlled system to route this high energy electrical charge into a capacitor to wait for 'triggering' by the ignition system. The capacitor is able to be recharged very quickly, allowing for a repetitive high-energy spark - much moreso than what you'd get out of a standard inductance coil which is charged up and releases it's energy, then must recharge fast enough to give the next spark required.
On many engine types, inductance coils (like those on your driver's side fender well) cannot recharge to high levels fast enough to keep up at high rpm's which leads to the power output trailing off as you exceed the ability of the coils to provide a hot spark. A CDI system will be able to recharge the capacitors faster than a coil, keeping up with the engine even into the stratospheric rpm range of some peripheral ported engines.
CDI is a little more expensive to install than a standard coil system, being computer controlled instead of 'distributor' and ignitor controlled, but yields much higher performance. As a homologation of these two designs, some engines use a mix of the best features of coils and CDI by placing a coil on top of each spark plug which is charged and ignited on it's own.
It's basically just a way to get a hotter, higher-energy spark to the air/fuel mixture to burn gas faster, more efficiently, and in the process generate more horsepower.
Capacitive discharge is the ignition system that uses a standard coil and a computer controlled system to route this high energy electrical charge into a capacitor to wait for 'triggering' by the ignition system. The capacitor is able to be recharged very quickly, allowing for a repetitive high-energy spark - much moreso than what you'd get out of a standard inductance coil which is charged up and releases it's energy, then must recharge fast enough to give the next spark required.
On many engine types, inductance coils (like those on your driver's side fender well) cannot recharge to high levels fast enough to keep up at high rpm's which leads to the power output trailing off as you exceed the ability of the coils to provide a hot spark. A CDI system will be able to recharge the capacitors faster than a coil, keeping up with the engine even into the stratospheric rpm range of some peripheral ported engines.
CDI is a little more expensive to install than a standard coil system, being computer controlled instead of 'distributor' and ignitor controlled, but yields much higher performance. As a homologation of these two designs, some engines use a mix of the best features of coils and CDI by placing a coil on top of each spark plug which is charged and ignited on it's own.
It's basically just a way to get a hotter, higher-energy spark to the air/fuel mixture to burn gas faster, more efficiently, and in the process generate more horsepower.
01-06-04, 12:22 AM
#5
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MSD = multible spark disharge, instead of hitting just once it hits multible times , whish believe me u they will , on top of throwing a 6'' spark, ask me how i know!
the multible spark disharge is well suited to the rotary due to it s propensity to miss especially while warming up, if you dont like putter youll like msd, btw the msd box is overkill, i run gm hei modules and two blaster2 msd coils and im very pleased, and the scope pattern lookes awesome
the multible spark disharge is well suited to the rotary due to it s propensity to miss especially while warming up, if you dont like putter youll like msd, btw the msd box is overkill, i run gm hei modules and two blaster2 msd coils and im very pleased, and the scope pattern lookes awesome
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