17prospective buyer

I was browsing eBay for exhaust stud kits for our cars out of curiousity and i saw some aftermarket SS studs with locking nuts (no washer). Immediately spotting the issue of SS into aluminum for any length of time, i asked the seller/manufacturer about the product:

9090666 sent a message about PORSCHE 928 16 V
EXHAUST STUD
KIT-- STAINLESS #350418792827
Dear charger440rt,

I noticed these
are not cadmium plated. This is very important seeing as the
928 engine is
almost entirely aluminum/alusil, won't these studs corrode?

Thanks

The Reply:
Dear 9090666,

Stainless does not corrode

John Martin
MMS &
Accessories

Just thought i'd share it, as pointless as it may be.

Ducman82

i have used them for lots of stuff of diff cars. good people.

how long would it take for the corrosion to happen any way?

Podguy

I just bought a stainless steel rod from McMaster and cut it into studs. Was that a bad idea? It seemed to work just fine and now I have all stainless hardware on the exhaust system including the EGR valve mounting bolts. Given how rusty everything was on the exhaust this seemed like a decent solution.

17prospective buyer

I thought you guys would react differently to this. You guys are usually meticulous aren't you?? I remember the time i suggested radiator alternatives to the stock Behr unit and people acted like i just kicked their dog. The thing i was thinking of was long term corrosion... sure it may be fine for a year or two but from what i've read the galvanic reaction welds the dissimilar metals together. Which could turn into a costly pair of unsalvageable heads. However, could it be true that the corrosion only happens with poor quality SS?

Bill Ball

My recollection is that stainless fasteners into aluminum isn't that bad. Aluminum in stainless corrodes a lot more. There is some metallurgical explanation for the difference. Still, cad plated would be better.

hacker-pschorr

There is a big difference between discussing various materials for fasteners and shoe-horning in a radiator from a Pontiac.

17prospective buyer

Shoe horning or not... it can and will be done.

hacker-pschorr

Good for you!! Nobody said it couldn't be done. Friend of mine has a big block Olds Toranado drivetrain in a 50's Beetle.

No matter how you slice it or justify it, still going to be considered a hack job by most. If you don't care, then go ahead.

Just like some people who feel it's ok to cut holes in the fender to make clutch jobs easier.

GlenL

That makes me ill. A real man would pull the engine.

928mac

Rob Edwards

I pulled the engine and it was still a huge pain in the ***. What does that make me?

17prospective buyer

I pulled the motor by myself... Hacker-IMO there is a huge difference in what you said. I'm talking about fitting a radiator that will use most of the stock mounting methods. I pulled my motor without any cutting/breaking (apart from the usual expendables that disintegrate when you touch them), i don't think it's that hard if you're methodical about it. I think it will be a nice clean job personally.


No hard feelings Hacker, to each his own.

Podguy

Bill,

The cad plated studs I took out were a mess. From what I understand is cad plating is obsolete due to toxicity to humans. The plating company I took the hardware to uses zinc and then cromate to duplicate the look of cad. They also offer bright zinc plating.

danglerb

I'd love to get a solid answer from somebody that actually knows metal etc., but pretty clearly the 928 seems to have some unique corrosion issues.

dogleg

17 p b. why did you have to pull your motor.IIRC your car was $10k and in pretty good shape?