Quick question about distributors

SmokeyBbear · Post by **SmokeyBbear** » Fri May 13, 2011 5:21 pm

Just wondering if anyone knows it if it possible to put a older model distributor out of a carby feed model into a newer fuel injected model
I notice the differents is the older ones have a vaccume advance on the side and has two wires instead of four

littlewhiteute · Post by **littlewhiteute** » Fri May 13, 2011 7:58 pm

And why would you want to do that?

steptoe · Post by **steptoe** » Sat May 14, 2011 1:50 am

EA82 you thinking about? You could with at least the flapper style AFM version with the can on the side of the dizzy, different again from a carby dizzy. Would need to wire it up correctly and understand the whole service delivery of the dizzy could be different and or detrimental depending on the demands of the engine. I was planning to stake the advance internals of carb dizzy to run on my EA82T on LPG if need be at about 16 degrees fixed

RSR 555 · Post by **RSR 555** » Sat May 14, 2011 4:06 am

From my understanding (others please help here if I'm incorrect) of the EA82 EFI dizzy, is that the dizzy is set to something like 20deg BTDC and then the ECU adjust the timing to suit what the engine is doing.. i.e. under load, cruising, etc.. The ECU get a vacuum sense, throttle position sense, knock sense and other inputs then tells the coil when to fire. I believe the dizzy in the EFI only senses engine revolution and of course distributes the spark to the appropriate spark plug.

I think (IMO) your EA82 EFI engine wouldn't run on a carbied dizzy.

Gannon · Post by **Gannon** » Sat May 14, 2011 9:28 am

Yep RSR555 has it.

The carby dizzy with the vacuum advance has either points or a relunctor pickup, which produces the pulses for the coil.

The EFI dizzy has a disc with 360 slots and an a pair of photo diodes. The ECU uses this information (along with throttle position, rpm and engine temp to calculate the ignition timing and output to the coil.

Are you sure its your distributor that is faulty? there is very little that can go wrong with the EFI dizzy

Im assuming you have an 88 or 89 touring wagon?

steptoe · Post by **steptoe** » Sat May 14, 2011 12:42 pm

partially has it....

1. Sure to be a few different carby model dizzys over the years.....

2. Then there is the NA mpfi like in 85 Vortex, think it was flapper and vac can on its dizzy possibly not same as carby dizzy

3. And the dizzy in 85,86 mpfi turbo 3 plug ECU uses flapper afm, set to 20 dBTDC old school

4.Then the 4 plug ECU EA82T uses hot wire afm, these dizzies are as Paul describes above - no vac cannister or internal advance guts all ECU controlled . I'd say Paul is correct in that they are set with a base timing and lets ECU do the rest

Physically they will all fit I am certain. Hook up a standard ignition moduled dizzy to power and earth? you are likely to be able to provide a spark but to what performance you are about to find out I suspect.

What are you thinking about, may we ask?