'74 260 Distributor Problems

[calliebrat]

This is Stacey in San Diego, CA.

Can someone give me the answer to this:

On the early Z motors L26 & L28 At what rpm's is the distributor in full advance? AND what is the degree of advance at this rpm?

Please e-mail me at: Staceyelcj@aol.com

Thanx! & Happy New Year!

The distributor on it now is a D6F3.

[Coastieee240z]

I wont email until I know I'm correct this will take research I think but isn't the vacuum advance designed to advance it as needed and therefore as more advancing would be needed as the higher the rpms are then full advance would theroreticaly be at redline no ? Or am I thinking wrong and it only has to do with throttle positioning ??

[biker]

hi Stacey

Depends on what else is done to the car e.g. camshaft, carbys.

It is a matter of experimentation to see where the car runs nicely. I set mine at 30deg at 3000rpm but it has a higher lift cam and i have a points dizzy.

Try it at 25deg at 3000 and work from there.

[beandip]

This is Stacey in San Diego, CA.

Can someone give me the answer to this:

On the early Z motors L26 & L28 At what rpm's is the distributor in full advance? AND what is the degree of advance at this rpm?

Please e-mail me at: Staceyelcj@aol.com

Thanx! & Happy New Year!

The distributor on it now is a D6F3.

I have read the info . but cannot varify the numbers . I have looked in my library and cannot find the sorce. However the total advance is , as I remember , achived at about 1600 RPm and is 13degs. So with a 10 deg. BTDC setting your total would be 23deg. The Centrifugal advance starts at about 500 rpm . I am using a later ZX dist. and I may be confusing the numbers slightly but this is close. I set my ignition on both the older 240 systime and the new one a 10 degs BTDC with no pinging . On your D6f3-01 dist. 1600 Rs you are maxed at 13 degs. I just found the figures in the book.

[beandip]

I wont email until I know I'm correct this will take research I think but isn't the vacuum advance designed to advance it as needed and therefore as more advancing would be needed as the higher the rpms are then full advance would theroreticaly be at redline no ? Or am I thinking wrong and it only has to do with throttle positioning ??

Partially correct. The vacume advance comes into play at lower RPMs. When the engine is turning in the 500 to 2000 range the mechanical advance hasent advance enough to provide the needed advance for power if you open the throttle , so the vacume advance takes over and provides the need advance. As soon as the RPM increase the mechanical systime takes over and provides what is needed. This is done with the springs and counter weights in the dist. . This advance curve can be adjusted with the use of different strength of springs. This needs to be done with the aide of a machiene that calabrates the this curve. This is what Biker was refering to , I believe.

[calliebrat]

Hey you guys- Thanx for the answers. From your input we have the answers to our questions. Greatly Apprieciated. Stacey