Still trying to figure out my problems with my setup. (weber 45dcoe, racing beat exhaust, other mods listed in sig...) Anyways I changed my timing as far as my dist would go to the retarded position and the car seemed to run better...

So im curious as if I changed the dist by 1 tooth if it can affect how cleanily the a/f mixture is actually burned and maybe this is the solution to my rear rotor plug fouling in 10 minutes problem?

 

oh and another question to retard the timing by 1 tooth would you turn to the next tooth clockways or counterclock ways?

 

counterclock. I had this same thing though different setup. I was actually detonating it was so far advanced. I retarded it quite a bit before the sound went away.

 

Have you visually checked for spark on all plugs? Just checking.

 

Changing timing affects both rotors. If you have one set of plugs fouling in a rotor and not the other, it's not the timing. It is either ignition/spark to that rotor, bad plug/wires or that side of the carb is not adjusted the same as the other. These are things that can be adjusted, addressed from the outside of the motor. The other possibility is a bad oil control ring in the fouling rotor.

 

You just confused me here let me quote you, "plugs fouling in a rotor and not the other, it's not the timing" and then you said, "It is either ignition/spark to that rotor" but isn't that timing?

I am confident that the oil control rings are good cause the engine has 30, 000- 40,000 on a rebuild. I am also confident the car is getting spark to the rear plugs because I have pulled the plugs with the car running and noticed a dramatic decline in engine performance... The engine is close to perfect if it wasn't fouling up those plugs...

 

The simple answer to your question is no. Changing timing will affect both rotors identically. Timing just determines the "time" when the spark is delivered during the compression cycle ( or towards the end of it ideally ).

Plug fouling is cause by 2 things ( well basically ); too much fuel or too little/late spark. Since your only seeing fouling on the rear plug then either that rotor is getting more fuel than the front or its getting a bad spark compared to the front rotot.

If I remember right, you had a fouled up a/f jet on the rear or left side of your carb. Try changing the bad jet with the good jet and see if the fouling now happens on the front rotor. If it does, the its the jet. Should be a simple test since it only takes 10 minutes for it to foul.