lowroller

OK I got one for you guys. I recently did the Dlidfis ignition trick on my 82 rx7. And I heard advancing the timing 20 degrees leading and 12 degrees trailing would give me the most power. .. So I went out and bought an inductive timing light with a 0/60 advance dial. .. OK so My leading is set to 20 degrees advanced and my (front) trailing is set to 12 degrees advanced. next I took the light and checked both leadings both of them were firing on the mark. then I went to check the front trailing bam it was firing on the mark... When I went to check my rear trailing I couldn't even see the mark on the pulley I played with the dial but I couldn't get the mark on the pulley to show up anywhere from 0/60 degrees. So I'm guessing when the rear trailing is firing the notch on the pulley is on the bottom cause I'm not seeing it anywhere.................................now I took my cap off and saw that the trailing points were pretty badly worn down. Any ideas cause this doesn't make any sense to me

j9fd3s

the leadings fire together, but the trailings wont. the front one should be on the mark, and the rear should be somewhere else. the 20degrees of advance is at 4000+ rpms btw



mike

Smog Fighter

If you were to make a mark on the opposite side of the pulley (180*), you would

see the rear trailing fire on that mark only. The reason why you don't have both

leading and trailing firing simultaneously is one rotor will have un-burned Air/fuel

mixture exposed to the trailing plug while the other is firing for power.

The Leading plugs on the other hand have burned gasses exposed to one while

the other is firing for power. The extra spark doesn't take as much energy to

jump the gap and will have a kind of cleaning effect on the electrodes (in theory).



Also, make sure to set your timing light to 2 cycle before using the dial to set

timing. Most timing lights are set up for 4 cycle piston engines that fire every

other TDC of the crankshaft. If your timing light doesn't have a 2/4 cycle switch,

then you need to set the dial to ****!!!

Smog Fighter

I will update my thread on timing.



Set dial to double what your desired timing is to be. set rpm to 4000 or so, then

twist distributer to achieve your correct timing.



sorry for the expletive above



Raul