Hey guys i have a '79 rx7 with a heavily ported 13b 6 port with an IDA Weber. The car has taken along time to build considering im away at college and the car is back at my folks place (400 miles away). Ok here is my question my car likes to run about 8 degrees more timing then she can start on. So my buddy suggested that we split the leading and trailing spark and use the trailing spark as a retarded timing to start the car. Then turn off the trailing spark and use the lead spark to run the car. Has anyone done this before? If so what would the wiring diagram look like? Yes i have checked the dizzy for correct timing and the appropriate tooth line up. Any thoughts?

 

[QUOTE=Cory Hanson;11451887]Hey guys i have a '79 rx7 with a heavily ported 13b 6 port with an IDA Weber. The car has taken along time to build considering im away at college and the car is back at my folks place (400 miles away). Ok here is my question my car likes to run about 8 degrees more timing then she can start on. So my buddy suggested that we split the leading and trailing spark and use the trailing spark as a retarded timing to start the car. Then turn off the trailing spark and use the lead spark to run the car. Has anyone done this before? If so what would the wiring diagram look like? Yes i have checked the dizzy for correct timing and the appropriate tooth line up. Any thoughts?[/QUOTE

There's no way your running too much timing that will not allow you to start on a stock dizzy.
I have a locked dizzy on my race car and had the timing at 38 degrees and it started with no problems. On a unlocked dizzy the timing is much lower on start up because of the centrifugal advance mechanism so timing increases with rpm. I have actually turned the dizzy past the end slot by notching it out to allow more timing and my engine had no problems starting up. You have some other problem like low compression, dizzy not stabbed properly( off one or two teeth), or an ignition problem.

Have you checked your timing with a timing light on crank up? And if so how much is your timing?

 

My dizzy is also locked and this is a track only car. I have checked the timing with a timing light and have taken it to two rotary specialty shops in the area. So i know the dizzy it spot on. It has been a year and a half sense i have been able to look at the car so i cant remember what the latest timing was. I had one shop tell me it was because of my port shap and length although, you maybe right with there being something else wrong with the ignition though. The dizzy was swapped to get away from the points to the standard mid 80's with the duel igniters. Could i be having problems with my leading spark not firing? Thankyou ultimatejay

 

Your best bet is to go with a direct fire ignition. In doing so you will have much more and greater spark adding to better response and more fun to drive!