projected tip spark plugs

[muffinstew]

As long as the pistion isn't hitting the electrode, are projected tip spark plugs are benefical compared to regular plugs? I assume it leads to better efficiency having the spark closer to the piston?

This is for a Honda 200X three wheeler. Standard plug the D8EA and the projected tip the DPR8EA-9.

 

[72customdeluxe]

Yeah, I think the point is to just have the spark more exposed to the fuel/air mix. I would just buy the standard. Never know if you'll have clearance issues...

 

[tom slick]

You could try it but you're not going to gain anything. Projected tip plugs are to address specific problems in specific engines.

 

[Shannow]

The kernal of flame starts between the electodes, and spreads everywhere from that point.

A pentroof 4 valve, maybe no so much difference.

A wedge head 2 valve, and the gains will be that much greater, as the kernal is starting that much closer to the centre of volume (and the hot exhaust valve).

 

[Eddie]

Usually the engine engineers have fully researched this and have data to back up the OEM plug they recomend.

 

[mechtech2]

In cars, extended tip plugs are the norm.
They have multiple benefits.
You have a particular case where clearance is an issue.
If an extended tip is made for your vehicle, I'd use it.

 

[muffinstew]

Clearence isn't an issue. I have already been running them for about a month now.

 

[tom slick]

have you felt a performance gain?

200x was a cool bike back in the day. How many times have you jammed your knee into the bars when the kick starter kicks back?

 

[muffinstew]

Oh....I'd say about 10 or 15 times. And with a high compression Weisco piston it hurts even more. I learned to turn the handlebars to the left before kicking. As far as the seat-of-my-pants says...no but theoretically wouldn't it produce a more effient burn?

 

[mechtech2]

More efficient burn? Probably.
But it keeps a plug cleaner, as well. It allows a cooler plug to not foul. [ex tip]