V4 crossflow differences

[EdwardNigma]

Re: V4 crossflow differences

I've come across a couple other threads in here that suggested the (Q)L77JC4 was an acceptable alternate for that motor, but I'm not an expert. I expect my dealer is going to put whatever the right plugs for it are in it when they do the tuneup.

 

[Dhadley]

Re: V4 crossflow differences

The (Q)L77JC4's are fine for that motor, no problem. Don't assume the dealer will put the right ones in. Double check and make sure he uses Champion only.

 

[87Aggie]

Re: V4 crossflow differences

Mr. Hadley, will the ...JC4's change performance in any way - better/worse idling for example?

 

[Chinewalker]

Re: V4 crossflow differences

The L77JC4s are good all-around plugs and in my experience idle better than surface gap plugs. The surface gap plugs are generally recommended for sustained high speed operation...<br /><br />- Scott

 

[87Aggie]

Re: V4 crossflow differences

Thanks Scott, I may try the ...JC4s. I'm trying to improve the idle somewhat on mine - gap em at .040 I suppose?

 

[Texasmark]

Re: V4 crossflow differences

Well you OMC guys, Merc has used surface gap for as long as I can remember so there must be something to them....using them now and at least back to '89 (my last engine).<br /><br />Mark

 

[Dhadley]

Re: V4 crossflow differences

Nobody is saying you can't use them in an E/J. I've just never seen an advantage and they're expensive. And you can't compare a Merc ignition system to an OMC. It's no secret the Merc ignition is hotter.