Pre combustors (new manufacturing)

[Jet A]

Got a call from the machine shop, stating two of my pre cups are cracked clear through. Need to find a good source for replacement. problem is, no one seems to make them or have them.

I came up with a solution...i think.

Why not make my own?

While i am at, why not upgrade the design?

Anyone attempted this? I have access to machines and tooling. Even a cnc if i really need it. Can this be done? What is the alloy, is there a better alloy for the job?

Looking for information pertaining to any or all of these questions

Thanks
DP

[zukgod1]

Interesting for sure.

I had a link for a supplier, I think it must be on my home computer though.

Someone will post up for ya.

As for the material type, I'm not sure. I wonder if tool steel would be robust enough, stainless maybe? I know back in my Toyota diesel days there was a stainless replacement available for thier IDI engine.

[Jet A]

Interesting for sure.

I had a link for a supplier, I think it must be on my home computer though.

Someone will post up for ya.

As for the material type, I'm not sure. I wonder if tool steel would be robust enough, stainless maybe? I know back in my Toyota diesel days there was a stainless replacement available for thier IDI engine.

a link to a manufacture would rock.

Seems like the two metal expansions rates would seriously seize or cause the precup to fall out.

Regardless,  i would rather buy them than make them.

[gigaz2]

I know you guys don't have a vw shop around every corner like we do, but why not buy them from VW?

I get everything from them.. rusted bolt? for a buck, I'll have them from VW, no worries.

[saurkraut]

Interesting for sure.

I had a link for a supplier, I think it must be on my home computer though.

Someone will post up for ya.

As for the material type, I'm not sure. I wonder if tool steel would be robust enough, stainless maybe? I know back in my Toyota diesel days there was a stainless replacement available for thier IDI engine.

My guess is Inconel

http://en.wikipedia.org/wiki/Inconel

[Jet A]

I know you guys don't have a vw shop around every corner like we do, but why not buy them from VW?

I get everything from them.. rusted bolt? for a buck, I'll have them from VW, no worries.

Cant buy them from VW. If you can...maybe you can get me a part number? Called my dealers, the said they are no longer avaliable. cant buy the head, cam, valves, nothin!

Inconel is good stuff, But i dont believe it does well in heat cycling, constantly being heated from 1400 to 600 would piss it off. This is just from memory...this could be 400 series stainless i am thinking of. Defintaly worth doing some research. Plus not setup to do that type of machining. I know for a fact that it gets work hardend something fierce.

But we will see....

[jtanguay]

yea inconel is pretty hard... you'd need special tools to machine that

[gigaz2]

sorry, too much part searches...
I know I saw them, just didn't remember where

Renault has them available on their parts program.

on the 1.6engine (F8M) there are two measures, 37.5 and 37.7mm (I don't have prices for that)

on the 1.9 engine (F8Q) only 37.5 and it costs 45€ each :O

[itzdshtz]

Here is the only place that I have found that still has pre-chambers, the only problem is that they are in Germany.

http://www.moto-szlif.pl/wirowe_de.htm

Give it a try.

Herman

[jimfoo]

I remember hearing they were Inconel as well. What do you need them for, 1.6, 1.9?

[subsonic]

http://vwdiesel.net/phpBB/viewtopic.php?t=6987

Got that from a canadian wholesale parts supplier distibuter.  Big one up there.  Tried to get some a while back, they said they had them but would not sell across border.

[Smokey Eddy]

Have you looked up Prothe? He might sell them. Or Mike... sorry i don't remember his full screen name for you to look him up someone may pipe up though.
I know they sell ... everything i think between them

[Jet A]

I remember hearing they were Inconel as well. What do you need them for, 1.6, 1.9?

1.6

Here is the only place that I have found that still has pre-chambers, the only problem is that they are in Germany.

http://www.moto-szlif.pl/wirowe_de.htm

Give it a try.

Herman

looks like they have them. But...i dont read, or speak german.

[gigaz2]

http://vwdiesel.net/phpBB/viewtopic.php?t=6987

Got that from a canadian wholesale parts supplier distibuter.  Big one up there.  Tried to get some a while back, they said they had them but would not sell across border.

thanks, I looked it up on ETKA, but the prechambers aren't on the picture.
my outdated soft says they cost about 14€ each from VW

I also searched for the 1.6 ones but no go

[myke_w]

I don't sell them either. I have no idea how you'd get them to stay in and trust them once they are out. My machine shop says they epoxy the ford truck ones in, but that's steel in cast iron, not aluminum like our setups.

FYI, many TD PC's I see have hairline cracks from heat, and as long as they aren't cracked all the way to the outside they are generally considered reusable. Though I always have them peened in anymore, just too many horror stories to take a risk.