Spark Plug reading Help Options

[tornik550]

I am in the process of tuning my carbs. I had been dealing with some significant rich running issues that I posted in a previous post. That issue is resolved. Now, I am able to drive the car however it seems to hesitate at cruising speeds (2500k rpm). Idle seems a little rough.

I am a novice at reading spark plugs. I am looking for opinions on this plug. The other plugs look the same except the white on the electrode only goes a little past the curve.

I should note that the timing was a bit too advance and has been dialed back a slight bit.

My guess- little too rich, too hot of spark plug and timing too advanced.


Setup info-
Dual weber 40 idf- recently sync'd
idle jet- 60
mains-145
air correction jets- 200
emulsion tubes- f11
vents 32
Spark Plugs- NGK BP7ES
Engine- 2.27l

I should also note that I have a lot of spark plugs laying around. Doe anybody know if a NGK BP8ES is hotter old colder than BP7ES (think its colder).

[VaccaRabite]

I am using nearly the same jetting on a 2056.

I think that your carbs may simply be too small. You may need to go up to 44s instead of 40s.

Also, are those plugs from idle, or from driving range? If the car idled at all before you pulled the plugs out, they are only showing you how your idle is. To see what your burn is under load, you have to turn off the engine while under load. Like going down the freeway, pull into a rest stop ramp, and turning off the motor while you are still moving under power, and seeing what the plugs look like.

Zach