Maximum amperage of diesel injectors.

[mudnut]

G'day all. I am in the process of building an injector pulse tester.

I could buy one, but where is the fun in that? The circuit I am building is for non-direct injection petrol engines.

It uses a couple of 555 timers and a MOSFET which is rated at maybe 15 amps.

I know that the newer diesels use sequential and multi-stage injection patterns and so draw a very heavy current.

Since I am building this unit I may as well make it useful for any engine.

Could someone please let me know what the CRD injectors current rating is so I can select an appropriate MOSFET, fuses, clamps and cables?

[mudnut]

Bump. Anyone?

[the evil twin]

Bump. Anyone?

Have you googled the Bosch site?

[mudnut]

ATM I'm lucky to get to log on to the forum as I am on slowed data for another couple of days. What are the fuses rated at on the Injectors?

[the evil twin]

ATM I'm lucky to get to log on to the forum as I am on slowed data for another couple of days. What are the fuses rated at on the Injectors?

Wouldn't have a clue offhand but I doubt the pull anything like 15 amps, be only a couple of amps I reckon.
Gotta take Chewy the wonder dog for walkies before I loos a limb.
I'll see if i can find out anything and post up later on.

[the evil twin]

Well, couldn't be more wrong I spose...
Voltages and Currents are all over the shop depending on the site (lowest was 400 volts and 2 amp but I doubt that is correct for the CRD)
Bosch don't list the specs for the Nissan/Renault injectors, possibly because of commercial agreements but who knows

Best I could narrow it down to was Voltage 100V, current limited at 20 amps

[mudnut]

Thanks, ET. Much appreciated.

[Flex]

Most modern CRD injectors are piezo type i.e. they work more like a capacitor rather than a inductor (coil) They operate off a high voltage, usually around 300V. The ones in the ZD30 CRD are of this type. Also the injectors need to be "tuned" to the ECU as each injector parameters are slightly different (due to manufacture variation)

[mudnut]

Thanks. I'll have to have a goods look round before making any decisions. Cheers.

[Yendor]

Have you had a look in the workshop manual? It should at least give you the resistance of the injector.