-
#45
by
truckinwagen
on 03 Feb, 2010 09:50
-
inconel(the generally accepted alloy for the precups) does contain some iron, but not much.
certainly not enough to be magnetic enough to notice, and not enough to rust.
one of its properties, in fact, is resistance to corrosion.
I have never seen a rusted precup, and I recently got a pile of junk heads a guy had sitting in his backyard for years that had rust on the valves, and corrosion on the aluminum so bad that I just threw them away(all the valves seized, and all the nuts rounded from rust)
might be a fair bet that your 1.5 had them replaced with steel ones at some point in its life before you got it.
-Owen
-
#46
by
Rabbit on Roids
on 03 Feb, 2010 09:59
-
inconel(the generally accepted alloy for the precups) does contain some iron, but not much.
certainly not enough to be magnetic enough to notice, and not enough to rust.
one of its properties, in fact, is resistance to corrosion.
I have never seen a rusted precup, and I recently got a pile of junk heads a guy had sitting in his backyard for years that had rust on the valves, and corrosion on the aluminum so bad that I just threw them away(all the valves seized, and all the nuts rounded from rust)
might be a fair bet that your 1.5 had them replaced with steel ones at some point in its life before you got it.
-Owen
every one of my 1.5s had the same kind. all magnetic. but the head is still bolted down on my TD engine, so i cant say for sure if those are magnetic. but the ones i have for sure are.
it has a dimple, and a B7 mark, normal OEM marks i think.
and another thing. the engine i pulled this from, was only ran for 80k miles, by one owner. and he never had anything done to the engine. then a lifter commited suicide and wiped out the head. so i knocked the 6 valves and 4 prechambers out of it and trashed the rest. this engine had some sort of weird head gasket i had never seen before. most of these i pull apart have victor or fel pro gaskets in them. but this one was quite a bit different. im thinking it was the stock VW gasket.
maybe 1.5's came with some other sort of material for the precups?
-
#47
by
rodpaslow
on 03 Feb, 2010 10:15
-
The one I had I used a rare earth magnet (fairly strong magnet) and had no pull to the precup what-so-ever. This is a 92 1.6 td head.
-
#48
by
Rabbit on Roids
on 03 Feb, 2010 10:25
-
like i say, i have no way to test my td cups right now, the head is still on the engine and i dont feel like tearing it down.
-
#49
by
Smokey Eddy
on 03 Feb, 2010 11:24
-
Wikipedia FELLA's
Inconelat most 10% Iron. not much. But look at all the other elements in there...
Chromium at up to 23% is only slightly less magnetic than Iron.
also, the machining section is a good read.
You might be able to make steel precups if the steel had a high carbon content and was extra hardened, age hardened then work hardned once or twice before it started to warp.
-
#50
by
Rabbit on Roids
on 03 Feb, 2010 11:26
-
owen was saying that he thinks someone swapped out my cups for steel ones, so that leads me to believe that they already make them out of steel.
-
#51
by
Smokey Eddy
on 03 Feb, 2010 11:32
-
My link doesn't work?
I'm using iExplorer at work ... that's probably the problem
the whole wiki page is a good read. Especially the Uses section.
-
#52
by
Smokey Eddy
on 03 Feb, 2010 11:33
-
if you click the link, it doesnt go anywhere, if you paste it to your browser, it works fine.
fixed.
-
#53
by
Rabbit on Roids
on 03 Feb, 2010 11:46
-
it was a good read. opened my eyes to some of its other uses. and it makes sense. ive always wondered what they make jet engine turbines out of. they are basically a big, fire breathing turbo anyway...
-
#54
by
truckinwagen
on 03 Feb, 2010 12:05
-
well prothe is selling new heads with magnetic precups, so they have to come from somewhere.
just because it has iron in it does not mean it will be magnetic, it is all about how the alloyed metals interact.
a quick search shows that some inconel is magnetic, and some is not.
-
#55
by
rodpaslow
on 03 Feb, 2010 13:01
-
I don't want to get too rapped up in inconel, but the one I have is a brownish, tan color which makes sense due to alloy. Ones I have in a cheap head I bought don't have the brownish color so I'm sure they're steel. Have these steel items like you've (anyone?)had held up fine?
I bought what I think are NA ones off the somba as suggested in this topic from Lloydminister as I'm not far from the guy being in Saskatoon. Hopefully they will fit my good TD head or the cheap one I bought. I'd prefer to use the TD head but it seems where I am no one can get them. I've checked VW and several other repair and engine rebuilders - no luck finding one TD precup!
-
#56
by
Rabbit on Roids
on 03 Feb, 2010 14:23
-
I don't want to get too rapped up in inconel, but the one I have is a brownish, tan color which makes sense due to alloy. Ones I have in a cheap head I bought don't have the brownish color so I'm sure they're steel. Have these steel items like you've (anyone?)had held up fine?
I bought what I think are NA ones off the somba as suggested in this topic from Lloydminister as I'm not far from the guy being in Saskatoon. Hopefully they will fit my good TD head or the cheap one I bought. I'd prefer to use the TD head but it seems where I am no one can get them. I've checked VW and several other repair and engine rebuilders - no luck finding one TD precup!
thats because they use the same size precups as 1.5's. 1.6 n/a engines use different ones than td engines. 1.5 precups will fit in a td head, they are the same diameter, but i dont think they are the same volume.
-
#57
by
1oldcj
on 03 Feb, 2010 15:47
-
Any news on new ones yet? (not the aaz ones)
-
#58
by
NintendoKD
on 03 Feb, 2010 20:56
-
No intent of a thread jack, but I would still be interested in aaz ones, I kinda need some. And for everyone else, I hope there is some news for their precups as well.
-
#59
by
rodpaslow
on 04 Feb, 2010 07:59
-
I bought the ones off the Samba and received them yesterday. They fit my TD head (TG) and they are a hard steel of some type, they are not the same as the ones I removed from my TD head. I will post the part number as they are VW/Audi, I'm not sure where the guy that had them received them from.
These are a bit loose in the head. Do you use a bit of the green loctite and dimple them in place or something else so they don't come out?