Question

[desertsubaru]

Could you take a disty from a sube that has points and put it in a EA82? My friends son is doing a project at his school about EMPs. Since my car dont have a ECU but does have electronic ignition that I know will fry. So I want to put points in it and do the test.

[GeneralDisorder]

You need a points distributor from an EA71 - the drive gear will need to be changed to the EA82 gear.

 

I'm not certain that EMP would hurt the normal hall-effect distributor though. Might cause the engine to miss slightly due to dispruption of the sensors magnetic field, but there's no IC's inside it so it shouldn't cause permanent damage. It's only "electronic" in the strictest sense - the hall-effect itself is requires a semiconductor to operate. But it's basically just an on-off relay for the coil.

 

EMP sensitive equipment generally needs to contain IC's that would be sensitive to large current flow.... the opto-electric CAS distributors from the FI cars would be fried, but plain carb "electronic" should be ok.

 

GD

[desertsubaru]

You need a points distributor from an EA71 - the drive gear will need to be changed to the EA82 gear.

 

I'm not certain that EMP would hurt the normal hall-effect distributor though. Might cause the engine to miss slightly due to dispruption of the sensors magnetic field, but there's no IC's inside it so it shouldn't cause permanent damage. It's only "electronic" in the strictest sense - the hall-effect itself is requires a semiconductor to operate. But it's basically just an on-off relay for the coil.

 

EMP sensitive equipment generally needs to contain IC's that would be sensitive to large current flow.... the opto-electric CAS distributors from the FI cars would be fried, but plain carb "electronic" should be ok.

 

GD

So there is no circut board to fry in the disty thats cool! Thanks GD once again you the man!

 

[GeneralDisorder]

Big enough EMP probably will destroy your clock circuit, and possibly the fuel pump control unit..... maybe other stuff like the power window controller, etc etc. Hard to say. All of them have IC's. Strictly speaking the ignition control should be fine though

 

GD

[desertsubaru]

Big enough EMP probably will destroy your clock circuit, and possibly the fuel pump control unit..... maybe other stuff like the power window controller, etc etc. Hard to say. All of them have IC's. Strictly speaking the ignition control should be fine though

 

GD

I forgot to ask about relays!

[GeneralDisorder]

Relays should be fine.

 

GD

[psylosyfer]

FYI a "hall sensor" as used in nipdens or hitachi distributers, really is immune to EMP it is actually a tiny leaf switch with contacts made of a magnetically sensitive material (probably any alloy containing enough steel) these contacts are sealed in a case axially (like two wires end to end with their ends overlapping) this creates a closed circuit, when the magnetic "ring" on the dist. shaft rotates close enough it "pulls" one lead away from the other

creating an "open" circuit. As the actuator "magnet ring" moves on the switch

snaps back to its closed condition. This on/off is the signal for the electronic control module to spark when needed (similar to points of old) Since the leads are sealed and barely flex,They are close to immortal as long as a massive over amperage is never passed through (enough to melt the contact). For some application's an optical sensor is used for basically the same type function. But in an environment where dirt could build up and block the passage of light, The hall sensor is a better choice.

Just thought someone might be interested, I don't know much! But I do know my profession (retired electrical engineer). Hope it's of some use.

The electronic ignition control unit is solid state and in theory sensitive to EMP, However, It is of an old simple design (basically a few transistors) and would take one enormous EMP to cause damage.

P.S. the relays are electromechanical hence immune to EMP.

[psylosyfer]

FYI a "hall sensor" as used in nipdens or hitachi distributers, really is immune to EMP it is actually a tiny leaf switch with contacts made of a magnetically sensitive material (probably any alloy containing enough steel) these contacts are sealed in a case axially (like two wires end to end with their ends overlapping) this creates a closed circuit, when the magnetic "ring" on the dist. shaft rotates close enough it "pulls" one lead away from the other creating an "open"circuit. As the actuator "magnet ring" moves on, the switch snaps back to its closed condition. Since the leads are sealed and barely flex.

They are close to immortal as long as a massive over amperage is never passed through (enough to melt the contact). For some application's an optical sensor is used for basically the same type function. But in an environment where dirt could build up and block the passage of light, The hall sensor is a better choice.

Just thought someone might be interested, I don't know much! But I do know my profession (retired electrical engineer). Hope it's of some use.

P.S. relays are electromechanical hence immune to EMP.