damn ignition....few ???'s

[skata]

what can a guy do to eliminate ignition problems? :evil:
it seems that if something is slightly not perfect with the ignition, that it wont work right.

if my plugs get a few hundred miles on them, i will get a slight high end sputter or ignition break-up. if i throw in new plugs, all is good again for a little while.
fwiw i have L35 heads and i use ngk ur6. i also have a new msd distributor and wires and coil. i even have a msd 6A box that i removed and problem still exists.

could the problem be that i need to run a hotter plug like a ur5? i never really boost more than 15psi or run race gas. could the colder plug(ur6) be getting fouled if it's not getting hot enough? does that even make sense? :-?

one other thing i thought of, could there be a voltage drop at the distributor when the rpms are increased, possibly due to insufficient factory wiring? would i be able to run another positive feed to the distributor to make sure i have no voltage drop?

somebody sell me a complete individual coil setup please.

 

[Matthew Little]

coil

coil

I would think the coil is most of your issue, I have the same setup, and the higher voltage coil will burn up a cap and rotor in no time. Use cr42ts plugs also.

 

[Captain Morgan]

well, if its the MSD Blaster #8226 coil, then thats probably not the issue. As far as plugs, im no expert, but I use the UR5's and they kick the crap out of the CR42TS's not only in firing but in longevity as well.

 

[Mad Mike]

If your engine is stock you should run the UR5's. Of course use a quality cap an rotor like Conrad's. What's your fuel pressure set at?

 

[skata]

If your engine is stock you should run the UR5's. Of course use a quality cap an rotor like Conrad's. What's your fuel pressure set at?

my engine is not stock. its been built up and i also run a bigger turbo and injectors. my fuel pressure is at 43# if i remember right.

i was reading the ngk webpage:
http://www.ngksparkplugs.com/techinfo/spark_plugs/techtips.asp?nav=31000&country=US

i'm guessing that i need to run a hotter plug(ur5's), cause i'm not really driving my truck hard most of the time, which could possibly cause my plugs to foul because of reduced cylinder temps. add the fact that i run a 160 t-stat and that helps produce reduced cylinder temps.

here is a quote from the ngk site

If the tip temperature is lower than 500°C, the insulator area surrounding the center electrode will not be hot enough to burn off carbon and combustion chamber deposits. These accumulated deposits can result in spark plug fouling leading to misfire.

my plugs dont get as black as the one in the pic, but the backside of my plugs(facing towards the head) get kinda black like that.

i still dont like the fact that if a plug is a little fouled that it will misfire. i'd like an ignition that would fire a oil soaked, carboned deposited plug.

 

[tytom]

If they are fouled it can be b/c of too cold a heat range but more likely from running rich for some reason. The MSD is a pretty darn good ignition and will fire even when some of the electrode is eroded but fouled plugs wont fire right even if You hook them up to a nuclear power plant.