[chrisp]

Greetings,
Does anyone have any info on a dizzy, number D612-52? I have a 71 with an L-28 and this is the distributor that is currently installed. The manual does not list this distributor number so I am guessing at the point gap and timing specs.

Thanks


Chris

 

[gboone]

Chris,
I'm pretty sure that all the original distributors on the L28's were electronic. The '75 thru '78 were different from the '79 thru '83. The modules were remote on '75 thru '78. The modules are mounted on the dizzy housing on '79 - '83. I'm looking at making up some electronic distributors of the '79 - '83 type, for the 240Z (L24 or L28 equipped) if you're interested.

The number you're providing does not resemble the #'s on '79 - '82 type electronic distributor. But if it's a '75 - '78 type, it should not have points. Typically the idle timing for an L28 should be set at 10 BTDC.

Gary

 

[jerja]

It was installed on the 71. The centrifugal advance is 24 degrees at 2830 RPM at the crankshaft.

 

[chrisp]

Thanks,

I guess that the point gap and static timing would be the same as shown in the book for a 71. The point gap is .018 and the static timing would be 17 btdc.


Chris

 

[jerja]

17 degrees will be too much initial advance. You want about 32 to 34 total advance (initial + centrifugal). Try setting the initial advance at 8 degrees.

The point gap should be .0177 to .0217.

Dwell angle should be 35 to 41 degrees.

If you want more initial advance the distributor centrifugal advance will have to be recalibrated to provide lees centrifugal advance. Then you provide more initial advance so that the total is still 32 to 34 degrees.

The Datsun L series engine will have a large drop in torque due to excessive ignition timing before detonation begins. I have witnessed this on numerous dyno runs on my 240.