Discussion
Bosch for me - LR Part No PRC 6574 about £45 but found this while having a search http://www.thexmod.com/item_detail.asp?id=3829
Not sure if brand new/old stock or used
Cheers
Hamish
Not sure if brand new/old stock or used
Cheers
Hamish
carob said:
Been swaping the coil. Noticed there is a a wire coming from a small round unit that is fixed to the coil mounting bracket. Iam sure this wire was not fitted before can anyone tell me what it is for and were it should be fitted.
Cheers
Rob
Hi Rob, might possibly be a suppresor for the radio.Cheers
Rob
Chedder
Its primarily a suppression capacitor for radio interference and is connected from coil + to earth, thus:
It is also perceived to assist in rapidly collapsing the coil primary voltage for a sharper high voltage discharge.
For the record you may be interested in a description and purpose of all the ignition components.
The Basic Components and their Functions
From battery through to spark plug and beyond, these are the key components involved in generating the bright blue spark that ignites the awaiting air/fuel mixture and they must all work flawlessly for maximum engine efficiency.
A Battery in good condition, capable of lighting the blue touch paper even whilst churning a reluctant lump on a freezing cold day.
An Ignition Switch with four key positions: 1, Off, 2, Accessories, 3, Ignition On and 4, Cranking. The latter two positions both supply 12 volts to make the ignition circuit come alive.
A Distributor with three tasks. 1, Determine the exact moment during the cycle to generate a signal pulse to ignite the touch paper, 2, Route the resulting spark to the right firework, and 3, Advance the ignition timing according to either inlet manifold vacuum or engine speed.
A Vacuum Advance Module that senses manifold depression as soon as the throttle plate moves away from the idle position and advances the timing to capture maximum efficiency from the upcoming explosions at low engine speed, then passing over ignition advance responsibility to -
The Mechanical (Centrifugal) Advance Mechanism that uses bob weights and springs to control the amount of ignition advance according the engine speed and rate of acceleration.
A Magnetic Rotor with eight peaks produces a pulsing magnetic field adjacent to -
A Pick-up Coil that generates its own output (like an alternator, so not needing a voltage supply) to send a synchronised sine wave signal through its two electrical connections to -
An Amplifier Module already connected between Coil negative and earth that responds instantly to the incoming signal, switching a path to earth for the negative side of -
The Coil, not unlike a transformer, which converts the switched current from the battery into 30,000 volts capable of bridging gaps of up to15mm with a bright blue lightening strike.
A Condenser (or Capacitor) connected into the low voltage circuit across the coil/amplifier combo to suppress Radio Frequency signals otherwise destined upset in-car entertainment systems and offend un-neighbourly soap addicts watching their TV’s. It is also perceived to assist in rapidly collapsing the coil primary voltage for a sharper high voltage discharge.
A King Lead connects the high voltage terminal of the coil to the centre turret terminal of -
The Distributer Cap that receives and transfers the high voltage discharges to the -
The Rotor Arm which allocates the lethal sparks to one of eight turrets connected to -
The High Tension Leads with a particular internal impedance, resistance or other RF suppression characteristic, terminating at the prickly -
Spark Plugs where a flash of highly charged electrons ignite the expectant air/fuel mixture inside the combustion chambers, such that, under all the various engine conditions, its exact occurrence is determined by -
The Ignition Timing, not in itself a component, but a critical function, often maladjusted.
A Trigger Resistor connects signals generated at coil negative, to Pin 1 of the ECU to notify it the engine is running and please keep injecting fuel until these pulses cease.
The same signals from coil negative also go off to the Tachometer to indicate engine rpm and to the Cruise Control over-speed relay for engine protection if the Cruise ECU tries to accelerate the engine when the transmission or gearbox is disengaged.
It is also perceived to assist in rapidly collapsing the coil primary voltage for a sharper high voltage discharge.
For the record you may be interested in a description and purpose of all the ignition components.
The Basic Components and their Functions
From battery through to spark plug and beyond, these are the key components involved in generating the bright blue spark that ignites the awaiting air/fuel mixture and they must all work flawlessly for maximum engine efficiency.
A Battery in good condition, capable of lighting the blue touch paper even whilst churning a reluctant lump on a freezing cold day.
An Ignition Switch with four key positions: 1, Off, 2, Accessories, 3, Ignition On and 4, Cranking. The latter two positions both supply 12 volts to make the ignition circuit come alive.
A Distributor with three tasks. 1, Determine the exact moment during the cycle to generate a signal pulse to ignite the touch paper, 2, Route the resulting spark to the right firework, and 3, Advance the ignition timing according to either inlet manifold vacuum or engine speed.
A Vacuum Advance Module that senses manifold depression as soon as the throttle plate moves away from the idle position and advances the timing to capture maximum efficiency from the upcoming explosions at low engine speed, then passing over ignition advance responsibility to -
The Mechanical (Centrifugal) Advance Mechanism that uses bob weights and springs to control the amount of ignition advance according the engine speed and rate of acceleration.
A Magnetic Rotor with eight peaks produces a pulsing magnetic field adjacent to -
A Pick-up Coil that generates its own output (like an alternator, so not needing a voltage supply) to send a synchronised sine wave signal through its two electrical connections to -
An Amplifier Module already connected between Coil negative and earth that responds instantly to the incoming signal, switching a path to earth for the negative side of -
The Coil, not unlike a transformer, which converts the switched current from the battery into 30,000 volts capable of bridging gaps of up to15mm with a bright blue lightening strike.
A Condenser (or Capacitor) connected into the low voltage circuit across the coil/amplifier combo to suppress Radio Frequency signals otherwise destined upset in-car entertainment systems and offend un-neighbourly soap addicts watching their TV’s. It is also perceived to assist in rapidly collapsing the coil primary voltage for a sharper high voltage discharge.
A King Lead connects the high voltage terminal of the coil to the centre turret terminal of -
The Distributer Cap that receives and transfers the high voltage discharges to the -
The Rotor Arm which allocates the lethal sparks to one of eight turrets connected to -
The High Tension Leads with a particular internal impedance, resistance or other RF suppression characteristic, terminating at the prickly -
Spark Plugs where a flash of highly charged electrons ignite the expectant air/fuel mixture inside the combustion chambers, such that, under all the various engine conditions, its exact occurrence is determined by -
The Ignition Timing, not in itself a component, but a critical function, often maladjusted.
A Trigger Resistor connects signals generated at coil negative, to Pin 1 of the ECU to notify it the engine is running and please keep injecting fuel until these pulses cease.
The same signals from coil negative also go off to the Tachometer to indicate engine rpm and to the Cruise Control over-speed relay for engine protection if the Cruise ECU tries to accelerate the engine when the transmission or gearbox is disengaged.
honestjohntoo said:
Its primarily a suppression capacitor for radio interference and is connected from coil + to earth, thus:
It is also perceived to assist in rapidly collapsing the coil primary voltage for a sharper high voltage discharge.
For the record you may be interested in a description and purpose of all the ignition components.
The Basic Components and their Functions
From battery through to spark plug and beyond, these are the key components involved in generating the bright blue spark that ignites the awaiting air/fuel mixture and they must all work flawlessly for maximum engine efficiency.
A Battery in good condition, capable of lighting the blue touch paper even whilst churning a reluctant lump on a freezing cold day.
An Ignition Switch with four key positions: 1, Off, 2, Accessories, 3, Ignition On and 4, Cranking. The latter two positions both supply 12 volts to make the ignition circuit come alive.
A Distributor with three tasks. 1, Determine the exact moment during the cycle to generate a signal pulse to ignite the touch paper, 2, Route the resulting spark to the right firework, and 3, Advance the ignition timing according to either inlet manifold vacuum or engine speed.
A Vacuum Advance Module that senses manifold depression as soon as the throttle plate moves away from the idle position and advances the timing to capture maximum efficiency from the upcoming explosions at low engine speed, then passing over ignition advance responsibility to -
The Mechanical (Centrifugal) Advance Mechanism that uses bob weights and springs to control the amount of ignition advance according the engine speed and rate of acceleration.
A Magnetic Rotor with eight peaks produces a pulsing magnetic field adjacent to -
A Pick-up Coil that generates its own output (like an alternator, so not needing a voltage supply) to send a synchronised sine wave signal through its two electrical connections to -
An Amplifier Module already connected between Coil negative and earth that responds instantly to the incoming signal, switching a path to earth for the negative side of -
The Coil, not unlike a transformer, which converts the switched current from the battery into 30,000 volts capable of bridging gaps of up to15mm with a bright blue lightening strike.
A Condenser (or Capacitor) connected into the low voltage circuit across the coil/amplifier combo to suppress Radio Frequency signals otherwise destined upset in-car entertainment systems and offend un-neighbourly soap addicts watching their TV’s. It is also perceived to assist in rapidly collapsing the coil primary voltage for a sharper high voltage discharge.
A King Lead connects the high voltage terminal of the coil to the centre turret terminal of -
The Distributer Cap that receives and transfers the high voltage discharges to the -
The Rotor Arm which allocates the lethal sparks to one of eight turrets connected to -
The High Tension Leads with a particular internal impedance, resistance or other RF suppression characteristic, terminating at the prickly -
Spark Plugs where a flash of highly charged electrons ignite the expectant air/fuel mixture inside the combustion chambers, such that, under all the various engine conditions, its exact occurrence is determined by -
The Ignition Timing, not in itself a component, but a critical function, often maladjusted.
A Trigger Resistor connects signals generated at coil negative, to Pin 1 of the ECU to notify it the engine is running and please keep injecting fuel until these pulses cease.
The same signals from coil negative also go off to the Tachometer to indicate engine rpm and to the Cruise Control over-speed relay for engine protection if the Cruise ECU tries to accelerate the engine when the transmission or gearbox is disengaged.
So do i connect the spade connector to the positive on the coil?It is also perceived to assist in rapidly collapsing the coil primary voltage for a sharper high voltage discharge.
For the record you may be interested in a description and purpose of all the ignition components.
The Basic Components and their Functions
From battery through to spark plug and beyond, these are the key components involved in generating the bright blue spark that ignites the awaiting air/fuel mixture and they must all work flawlessly for maximum engine efficiency.
A Battery in good condition, capable of lighting the blue touch paper even whilst churning a reluctant lump on a freezing cold day.
An Ignition Switch with four key positions: 1, Off, 2, Accessories, 3, Ignition On and 4, Cranking. The latter two positions both supply 12 volts to make the ignition circuit come alive.
A Distributor with three tasks. 1, Determine the exact moment during the cycle to generate a signal pulse to ignite the touch paper, 2, Route the resulting spark to the right firework, and 3, Advance the ignition timing according to either inlet manifold vacuum or engine speed.
A Vacuum Advance Module that senses manifold depression as soon as the throttle plate moves away from the idle position and advances the timing to capture maximum efficiency from the upcoming explosions at low engine speed, then passing over ignition advance responsibility to -
The Mechanical (Centrifugal) Advance Mechanism that uses bob weights and springs to control the amount of ignition advance according the engine speed and rate of acceleration.
A Magnetic Rotor with eight peaks produces a pulsing magnetic field adjacent to -
A Pick-up Coil that generates its own output (like an alternator, so not needing a voltage supply) to send a synchronised sine wave signal through its two electrical connections to -
An Amplifier Module already connected between Coil negative and earth that responds instantly to the incoming signal, switching a path to earth for the negative side of -
The Coil, not unlike a transformer, which converts the switched current from the battery into 30,000 volts capable of bridging gaps of up to15mm with a bright blue lightening strike.
A Condenser (or Capacitor) connected into the low voltage circuit across the coil/amplifier combo to suppress Radio Frequency signals otherwise destined upset in-car entertainment systems and offend un-neighbourly soap addicts watching their TV’s. It is also perceived to assist in rapidly collapsing the coil primary voltage for a sharper high voltage discharge.
A King Lead connects the high voltage terminal of the coil to the centre turret terminal of -
The Distributer Cap that receives and transfers the high voltage discharges to the -
The Rotor Arm which allocates the lethal sparks to one of eight turrets connected to -
The High Tension Leads with a particular internal impedance, resistance or other RF suppression characteristic, terminating at the prickly -
Spark Plugs where a flash of highly charged electrons ignite the expectant air/fuel mixture inside the combustion chambers, such that, under all the various engine conditions, its exact occurrence is determined by -
The Ignition Timing, not in itself a component, but a critical function, often maladjusted.
A Trigger Resistor connects signals generated at coil negative, to Pin 1 of the ECU to notify it the engine is running and please keep injecting fuel until these pulses cease.
The same signals from coil negative also go off to the Tachometer to indicate engine rpm and to the Cruise Control over-speed relay for engine protection if the Cruise ECU tries to accelerate the engine when the transmission or gearbox is disengaged.
Rob
Yes, the white or black wire - it may be either - coming out of the centre of the condenser goes to coil + and the body of the condenser is connected to earth usually via a coil bracket fixing bolt.
Here is one connected in a different ignition system module showing the wire exiting from the centre of the condenser.
Here is one connected in a different ignition system module showing the wire exiting from the centre of the condenser.
carob said:
Hello Tony
Hows tricks lomg time no hear, hows the beastie?
Cheers for the advice, never noticed it before but also sure it was not fixed to anything just a wire with a spade conection on the end.
Cheers
Rob
Hiya Rob, the Wee Beastie is currently being recommisioned ready for its MOT at the end of the month, it hasnt seen tarmac since last Sept and now has a few electrical glitches and a sticky handbrake due no doubt to being left out in all weathers over the winter....but at least the bugger started!Hows tricks lomg time no hear, hows the beastie?
Cheers for the advice, never noticed it before but also sure it was not fixed to anything just a wire with a spade conection on the end.
Cheers
Rob
Looking forward to getting out it in again as now the sun has shown its face I'm getting withdrawal symptoms.
Congrats on the BAR, it sounds like it was a huge success, may get to participate next year with a bit of luck.
Tony
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