Why do some diesels have glowplugs and some not? - PeachParts Mercedes-Benz Forum

Shorebilly · #11 02-03-2007, 10:54 AM

Quote:

Originally Posted by Brian Carlton

In looking at the diagram for the prechamber, glow plug, and ball, you'll notice that the ball is probably 6-9 mm away from the tip of the glow plug. The tip resides in the air space between the bottom of the injector and the ball.

So, with the plugs on for 15 seconds, the capability of getting the ball to anything close to "hot" is non-existant. It's the airspace above the ball that gets most of the benefit from the glow plug. The fuel must pass through this space on its way to the ball. While the ball certainly helps with dispersion, it can't be the main source of heat to light the charge. The steel could never soak up enough heat within the short glow plug cycle.

I would think that the surface of the ball would pick up a bit of radiant heat in a small space.......and as you pointed out the air within the pre-combustion chamber would be warm/hot.......

Perhaps I am missing something, but that's how I thought this type of pre-combustion chamber works....perhaps I am mistaken, would you care to enlighten me???

SB