ignition check?

[mr.318]

anybody know how i can check my ignition system to see if it's up to par i've went to a smaller carb 600 runs good no black smoke but plugs still black sooty looking it has a moparperformance dist. orangebox chrome accel coil morso 8.5 wires moparcap an rotor champion plugs

 

[BJR Racing]

For that orange box you need the 1 ohm ballast resistor and the Accel Super Coil, and wire the Ign box through the new ballast and not through the old 4 prong ballast as this is not how this box should be wired. Look in the mopar engine manual in the ign. section.

 

[moper]

What BJR said. I verify the coil's getting the juice it should with a volt meter. If it seems low (under 9 volts) I'll figure out what's up with the wiring. The orange box pulls out timing at higher rpms too. An FBO or even the Std Ignition stock replacements do not, and IMO are better boxes. I'm not a big fan of Accel either. But if it's getting low voltage, no coil will work right.

 

[mr.318]

i've already got the 2 prong required ballast i bought the mopar kit when i swaped the points out came with everything it ran right before i've had this problem since i put the new heads on 202 an 168 vavles dose the bigger vavles dump more fuel? i don't know fixing to check coil i have a new stock one would it be better?

 

[BJR Racing]

The blackness/ or richness is comming from the port volume being larger, and the 318 bore can't use that much port volume and the velocity is slower due to larger ports and valves. Which when the port becomes too large the fuel ratio will be richer as the engines vacuum is lower and the signal to the carb is stronger which it thinks that the engine needs more fuel. Smaller ports that are more efficent will make more power and torque and will be easier to tune and use less fuel. This is why the factory made 2 sets of heads, one for the 273/318 and one for the 340/360. The only reason that they use the same heads on the 318/360 magnum engines now is because of the fuel injection systems. And they change the computers to adjust the amount of fuel that each engine recieves so that they can maximise hp and tq. and meet emmissions.

 

[rumblefish360]

And more of a reason to stick to a smaller skinny port for the 318.

When that fuel comes down the port, at a slow rate, the fuel can not break up as well if the port was thiner, and faster flowing. The larger droplets can not fully burn up and if they do, the black carbon is the result. Also what seems to be rich from the tail pipe could also result.

 

[mr.318]

coil checked out okay had a stock ecu so i changed the orangebox out drove it pulled plugs oh yes there greyish white i'll be putting my 750 back on i built this engine from an 90's 400 horse 318 article by steve duluzte not spelled right anyway just thought i'd throw that in