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[Logic]

Originally Posted by freebeard

The 06-20 video was helpful. I now am convinced the prechamber is filled efficiently, but now I have to worry about how it is exhausted. As per usual, my basis for understanding is a carburated flat four. So I can see the dual spark plugs because that's common practice in aviation, but I don't see how to deal with the hot spot created in the head that wants additional cooling.

Anaconda: The Educational Version.

How it's exhausted:
This may help?
Get a bottle. Fill it wit smoke and blow over the opening at different angles, keeping nozzle to valve/s angle in mind. A mirror will help.

What hot spot? Below the exhaust valve?
Sharp points?

Look into combustion chamber softening and Somender Singh Grooves.
They are discussed elsewhere here.
Interesting is the density the gas in the squish area can reach!

I NB that a spark plug's J electrode has a good number of 'sharp' points where pre-ignition may well get started.
Strangely no one has thought to take to them with sandpaper. (shim stock to protect the other electrode)
I've never gone high compression so it's just been a thought so far. pgfpro..?
That may be my simplest anti knock idea yet now I think about it again!?

[freebeard]

What hot spot? Below the exhaust valve?
Sharp points?

The one in the Maserati video at ?t=491

[Logic]

Originally Posted by freebeard

The one in the Maserati video at ?t=491

Ah.
Well that's a nice to have but unless pgfpro has had his chambers metal 3D printed with water cooling chambers incorperated he gets away without them.

He is able to use mixtures so lean that they burn 'cold' vs the usual 'too hot' thx to the turbo/s and fine pressure control and pre heating!
He does have water injection fitted, but I don't know if that just 1 big nozzle pre intake manifold, or 4 carefully positioned injectors aimed toward the chambers.

As he goes with water dissolved in his gasoline (or thinners), ethanol, methanol power mix I assume it's one big injector..?

Again; NB my 'round the sharp corners on the sparkplug's J electrode then buff/polish it' idea..!
Plug thread/s exposed to the chamber is also out. As are the 90 deg corners of the cylindrical bit.
I THINK that may be my best (easy, cheap) pre-chamber anti knock idea yet!?

It's these 90 degree type sharp corners that get/stay hottest and originate knock.
Think of it this way:
Try make a metal plate red hot with a lighter.
Not going to work, but if the plate has a nice pointy corner, preferably with a machining burr; you may well get that to glow...

(Hmmm! Ive just had another idea, but a picture is worth a thousand words that hardly anyone will read and/or understand...
I'll work on a picture. Gotta get back into CAD!
I let that ball drop when TurboCAD changed the game completely with their 'new' windows version)