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Author Topic:   Best plugs for 1993 Evinrude 88 SPL
Barnacle Bob posted 12-13-2006 08:43 AM ET (US)   Profile for Barnacle Bob   Send Email to Barnacle Bob  
Any thoughts on best spark plugs for my 1993 Evinrude 88 SPL. It is on back of my 1962 Nauset. Thanks.
jimh posted 12-13-2006 08:56 AM ET (US)     Profile for jimh  Send Email to jimh     
The recommended plug is a Champion QL77JC4 or QL82C. Recommended gap is 0.030-inch.
Barnacle Bob posted 12-13-2006 10:03 AM ET (US)     Profile for Barnacle Bob  Send Email to Barnacle Bob     
Jim, thanks... would you say those are the best? Friend is reccomending NGK


fourdfish posted 12-13-2006 10:31 AM ET (US)     Profile for fourdfish  Send Email to fourdfish     
Bob-I have tried them both and did not notice any difference.
The Judge posted 12-13-2006 03:54 PM ET (US)     Profile for The Judge  Send Email to The Judge     
Champion L77JC4 is the old number so try them first, usually cheaper and what is recommended in manual.
jschmidt63 posted 12-13-2006 06:06 PM ET (US)     Profile for jschmidt63  Send Email to jschmidt63     
Sorry I cant recommend plugs but I have the exact same motor (same year too) on my 70 katama. Its good to know other folks have it on whalers too. I recently had my motor serviced at Ace Marine in Stuarts Draft Virginia, the mechanic did good jop and replace the plugs too, runs allot smoother now in idle and all around.
jimh posted 12-13-2006 07:52 PM ET (US)     Profile for jimh  Send Email to jimh     
The difference between a QL-series spark plug and an L-series spark plug is the inclusion of a radio-frequency noise suppressor in the QL-series. Using the QL-series plugs will tend to reduce the amount of radio-frequency energy and noise produced by the ignition sparking of the engine. There are several reasons why you might want to reduce the amount of radio-frequency noise produced, and they all are based on the concept of interference.

There is obvious potential for radio-frequency noise generated from the engine ignition sparking to interfere with radio-frequency receivers near the engine. The boat's VHF Marine Band radio will be a prime target for interference. However, even if your boat does not have a VHF Marine Band radio, you may want to use the QL-series plugs.

Radio-frequency noise can also interfere with SONAR devices. It is quite common to see artifacts from the ignition sparking interfering with SONAR devices, particularly those which have a rasterized display of the signal.

Finally, there are other electronic devices in the engine itself which may be susceptible to being interfered with from strong radio-frequency noise signals. For example, electronic engine controls, particularly those which employ microprocessors, are susceptible to interference.

The only disadvantage to using the QL-series plugs is a slight reduction in the spark in the plug as compared to a non-suppressor plug, and also an increase in the cost of the plug. You can decide if the benefits outweigh the disadvantages in your particular installation. You can base your decision on the other equipment on the boat with which the ignition spark might interfere, and on the type of engine electronics you have, which may also be at risk to interference.

contender posted 12-13-2006 10:07 PM ET (US)     Profile for contender  Send Email to contender     
Jim is correct, the correct plug for the engine is a Champion QL77JC4 at .030, A/C also makes this plug (A/C = Arthur Champion), Autolite 2634, and NGK (do not know the number) I have used all the different plugs and have found no difference, Except the autolite seem to corrode faster on the outside of the plug than the others. I buy what I can get a deal on...good luck
Teak Oil posted 12-14-2006 12:11 PM ET (US)     Profile for Teak Oil  Send Email to Teak Oil     
I have tried Autolite, NGK and Champion just becasue those are what my particular auto store had at the time and I have noticed no difference either.
tpnaquin posted 12-14-2006 05:15 PM ET (US)     Profile for tpnaquin  Send Email to tpnaquin     
I have the 1996 88SPL with Champion QL-28C plugs....(not the same year or plugs). The odd thing here is I just got the rig back from the shop (water/ fuel pump replace , (and plugs) and they told me that I had the wrong plugs (I had NGK BP7HS).

Anyway, the motor seems as strong as an ox. *(Happy with that)*

I'm pushing a 17' (1986) Montauk with ease with this motor.

Just wondering... What prop are your turning with this motor?


Teak Oil posted 12-14-2006 06:34 PM ET (US)     Profile for Teak Oil  Send Email to Teak Oil     
I am running a 13.5" x 20" OMC Raker prop, but you will not be able to turn that much pitch unless you get a jackplate. Before that I ran a OMC aluminum 13x19 prop with great results for aluminum
jimh posted 12-15-2006 12:15 AM ET (US)     Profile for jimh  Send Email to jimh     
Please don't change the topic to propeller selection. Begin a new discussion when you wish to change the topic to something completely different.
jimh posted 12-15-2006 12:19 AM ET (US)     Profile for jimh  Send Email to jimh     
contender--"A/C = Arthur Champion"--that is very interesting trivia.

My OMC engine also used Champion QL77JC4 plugs. I have changed them twice in the last three years. They seem to work well. I have not had a problem with any failed plugs due to cracking.

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