New Pre Chambers Available?

[myke_w]

So - I know this has been asked before but I figured I'd stir the topic since it's been a while.

Does anybody have any news leads on new prechambers?

[arb]

So - I know this has been asked before but I figured I'd stir the topic since it's been a while.

Does anybody have any news leads on new prechambers?

Seams like some enterprising individual might start casting them from HMS-1011 or some other air-melt super alloy ;-)  (Ni Cr Co)

[Turbinepowered]

I know I'd be willing to pay $15-$25 each for good new prechambers... less is better, but that's about where my max price has to sit. I would buy plenty, though...

[arb]

I know I'd be willing to pay $15-$25 each for good new prechambers... less is better, but that's about where my max price has to sit. I would buy plenty, though...

When I made this type of metal (certified version) it was sold for $100 per pound in 1985. They had a "Renee" (french for reborn I was told) version for much less. The castings and machining (grinding not turning) would be the real cost.

If you could get an accurate 3D CMM of the chambers inside & out, molds could be made easily from stereolithograchic processes
 http://www.stereolithography.com/

There are many casting companies out there to do the casting
http://www.thomasnet.com/products/castings-plaster-mold-process-12421202-1.html

[Turbinepowered]

I know I'd be willing to pay $15-$25 each for good new prechambers... less is better, but that's about where my max price has to sit. I would buy plenty, though...

When I made this type of metal (certified version) it was sold for $100 per pound in 1985. They had a "Renee" (french for reborn I was told) version for much less. The castings and machining (grinding not turning) would be the real cost.

That mean I'm pinching pennies too tight and need to loosen up on cost? :p

[tSoG-84bit]

A club member is a damn fine machinist. Get me prints, and I'll see if his shop can quote a run of them. 100 units? 1000? It's a small shop, but well equipped, so I can't imagine it'll be cheap, but I'll see. He was gonna try and reverse engineer some super nozzles for me, but I've yet to find a NOS unit that he can work from.

[stomperz71]

Crazy Question I have!!

When you talk prechambers, what are you refering to? I just removed my head and was told if theirs cracks in the prechambers its junk!

Thanks

[Possum79]

Pre chambers are the round things in this picture below the valves. Has a littel hole in it. Its where the injectors squirt into. all the fuel and air "swirl" around and then get compressed and go boom. ha. they also go by swirl chambers hence the "swirl"

[stomperz71]

Thank you for that!

Would that be the same as precups? I've heard that term used also.

Now are the cracks obvious? Where would they be? The only cracks I seen on my head were between the valve seats.

[rabbid79]

The terms precups and swirl chambers are somewhat sononymous.  In the VW "swirl chamber", the fuel is directed toward the outer wall of the chamber creating a swirling motion.  In a "precombusion chamber", the fuel is directed pretty much toward the center of the chamber and doesn't create a distinct swirl.  I believe the older IDI Mercedes-Benz engines use this technique.

As for the "precup cracks", they generally go between the valve recesses and the swirl chambers.  Sometimes they're in the swirl chamber inserts themselves.

[myke_w]

A club member is a damn fine machinist. Get me prints, and I'll see if his shop can quote a run of them. 100 units? 1000? It's a small shop, but well equipped, so I can't imagine it'll be cheap, but I'll see. He was gonna try and reverse engineer some super nozzles for me, but I've yet to find a NOS unit that he can work from.

If that's the case I'd be glad to send him some good ones to copy?

[rabbitman]

I'm pretty sure topline makes their own pre chambers, they make heads,cams, valves all that stuff for these diesel's so I wonder if someone could pull some strings and just buy a bunch of pre chambers?

[myke_w]

Thanks for the tip - I just got off the phone with topline and I may be doing business with them for the chambers. I'll update the thread when I have more info.

[arb]

Thanks for the tip - I just got off the phone with topline and I may be doing business with them for the chambers. I'll update the thread when I have more info.

Looking forward to the info :-)

[burnt_servo]

I'm pretty sure topline makes their own pre chambers, they make heads,cams, valves all that stuff for these diesel's so I wonder if someone could pull some strings and just buy a bunch of pre chambers?

if they make their own heads , could it be possible that  the precups only fit their heads and not oem vw heads ?