85 3.6 V-8 OMC Correct Spark Plug Gap...

[VELOCITOY]

...using Champion L77JC4 821 M ...?...I can't frikken remember...030..040..?.And since I have your attention..lol..is there a better plug.?..I have had good luck with the Champs, but am curious...Thanx...:o

[perfmarine1]

...using Champion L77JC4 821 M ...?...I can't frikken remember...030..040..?.And since I have your attention..lol..is there a better plug.?..I have had good luck with the Champs, but am curious...Thanx...:o

.030 all OMC 2 stks. that motor been updated to QL78YC/L78YC according to champion.1985-1997 V-8 300hp

[VELOCITOY]

...I thank you Perf1...and will look into the Q/L78YC thing...what is the "pre-fix" number on those.?..The L77JC4's are 821M.?.. my guy at my parts place commented on the 821M designation being a change.?..Thanx...

[Riverratt]

If you are running the vro you want the QL

[VELOCITOY]

...no VRO...what is the diff on QL & L ..?..with/without VRO..?.very curious now...like the useful factoids...thanx..

[Riverratt]

QL is a suppressor plug which is recommended if you run a vro for less interference with the alarms.

[seahorse]

Not only just for RFI problems, the suppressor sparkplug (it's not a resistor plug) with the Q in the prefix is needed for the correct operation for most larger OMC CDI motors. A suppressor as opposed to a resistor, consists of a small coil of wire inside the plug that looks like a ballpoint pen spring and it helps block the AC component of the ignition system without degrading the DC spark across the gap. Without the suppressor, often a slight miss occurs as the spark duration is shorter than with the Q series. With a 5000 ohm resistor plug, the spark energy is diminished somewhat. Electrical engineers can talk about the effects of suppressors and electrical energy all day long, but this is just a basic explanation of what occurs in the OMC ignition systems that are designed for the Q type plugs.

[VELOCITOY]

...wow..thanx for the info...