Crossfire plugs?

[Dusthawk]

Here's a thought, this being a Hemi type cylinder with the plug directly over the middle of the piston, is there someone, like Bosche, who makes a cross fire type plug for it? That negative electrode really does block alot of the spark, reducing efficiency. I found Bosche makes a crossfire plug for my Camaro and had an immediate jump of 30HP in the 2.6L V6. I would think the crossfire would be ideal for this application.

 

[seadoosnipe]

Crossfire?

No.....don't think trying to add any more heat to the heads is such a good idea. Remember, with this being a 2-cycle engine, the ignition temperature plays an important role in not burning everything. You need to have a little left over for lubrication.......

 

[kustomkarl]

Actually if you get the proper heat range plug for the application it will work. Just don't go up or down in heat range. Fuel consumption drop isn't that good compared to the cost of the plug...they are expensive. It balances out until you foul a plug, than your upside down in cost with the added expense of replacing plugs again.

 

[seadoosnipe]

Hemi?

I don't think it's really that much like a hemi head, but there are hotter plugs out there you can run. I just don't think the small amount of horsepower you'd gain is worth the additional wear and tear on the gaskets. There is a red rubber type gasket that seals the water jacket at the cylinder at the spark plug......

 

[kustomkarl]

Uh no it's not a hemi...it is just not that shape to be a hemispherical head.

 

[Dusthawk]

okay, maybe Hemi was the wrong word, I meant it in the manner of the plug being in the middle top of the combustion chamber.

 

[ScubaDoo]

That actually sounds like a 2 stroke engine.....oh yea it is...silly me.

 

[dieselman]

The new HEMIS have 2 plugs per cylinder and fire one plug on compression and at the same time one on exhust on a different cylinder like 1-6 2-5 ect. this is what is called crossfire or waste spark and is for emmission so the hemi would pass the EPA testing. The plugs you are talking about are called splitfire and like said in the post above are not good in a 2 stroke but will help in a 4 stroke or so thay claim.

 

[Dennis]

Split Fire

I knew a guy who tried the splitfire plugs in his 1996 Yamaha 700 and found that there was no advantage in using them and that they were a total waste of money.

DAWG

 

[Dusthawk]

well, honestly, I don't know the name of the plug, but it isn't split fire, those are garbage.

The ones I am talking about have either 2 or 4 ground electrodes that conform to the insulator and stop level with the end of the insulator. This leaves the spark gap completely open to the combustion chamber from any angle and promotes a more complete burn of fuel. I am going to find out if there is a plug designed for SeaDoo that cross references with the plugs I have in it now. With a little research, I can determine proper heat range and everything.

 

[kustomkarl]

Dusthawk I believe the brand of the plug is called CrossFire...like Champion , or Ngk...I know the ones your talking about.

 

[Dusthawk]

This is the type plug I meant to describe. They have 2 versions, this one with 4 negative electrodes, and one with 2. Thay are the platinum +2 and +4

 

[kustomkarl]

That's the one's I thought you were talking about.

 

[93'XP]

This is the type plug I meant to describe. They have 2 versions, this one with 4 negative electrodes, and one with 2. Thay are the platinum +2 and +4

those are Bosch plugs, i put a set of the 2+platinums in my 94' ford 460 and it made a huge difference, but if i run them in my mustang it runs like crap, so it only works good in some applications, for $9 a plug i dint think it is really worth it, but if someone tries it then we will all learn if those are a good choice for plugs

 

[Dusthawk]

The bad news is that Bosch doesn't make a plug compatible with by Doo. I brought my plugs down to the part store and went through the Bosch book but no cross references showed up.

 

[seadoosnipe]

Ngk

I'd recommend the standard NGK plugs from the manafacturer, unless your building a mod. There is no need for the extra expense, when there will not likely be a noticable difference.

 

[Dennis]

Ngk Plugs

Yeah, I agree with SEADOOSNIPE. It's probably best to stick with the NGK spark plug. Alot of people have tried different type spark plugs looking for a "noticable difference" only to find out the only "noticible difference" was a hole burned in a piston!!!

DAWG

 

[kustomkarl]

NGK is a recomended plug because it is the correct heat range.

 

[seadoosnipe]

Other plugs....

If you want to, you can X reference your plug to the Bosch, Champion and Denso line of plugs. Although the NGK plug is best because of it being a number one leader in resistance plugs, you can cross to another.
But as Karl has said, you may not be able to cross to the split fire etc....due to the heat ranges...........

 

[kustomkarl]

Heat range is key here....too hot and you have piston ash trays for the coffee table...
Karl

 

[seadoosnipe]

To cold!

And to cold, you'll be wasting a lot of money out the tail pipe....so very important that you match the plugs with the engines output.....:agree:

 

[kustomkarl]

I think I got to get me one of those tail pipes for my seadoo...Then we could start a trend... uh oh, give me an energy drink or 4 and watch out, my fingers are on fire... I liky the NOS energy drinks..

 

[manicmechanic]

Hole in piston!

I've had many customers bring in their skis with no compression.....just to find out, they weren't running the NGK plugs.....take off the head, and low and behold, there is a hole in the piston!...............use the recommended plugs for your ski.

 

[kustomkarl]

:agree: That's being right on!!
Karl

 

[manicmechanic]

Very important!...

Also, it's very important that if a salesman is crossing your plugs for you, make sure they are resistor plugs........if not, you'll get interference in your CDI module.