To the best of my knowlage our engine blocks are Aluminum,
However, ZZP sells a brass fitting for an oil feed line for the LSJ.

I was thinking about the poltential for corrosion and looking at the
galvanic corrosion chart, brass + aluminum = bad news (corrosion)
Worse even, is that the brass fitting will cause the aluminum block to corrode.
If it was the other way round, youd simply need to replace the fitting, now were looking at, drilling out the hole, and taping it for a helicoil.

Perhaps I'm missing something.
But does anyone know where I can get this fitting in Aluminum?

Cobalt & Ion ---> ZZ Performance

 

There's all kinds of companies like Russel...heck, even Summit racing private labels aluminum fittings...Fittings and Hoses at SummitRacing.com: fittings, hoses, and lines for fluids

 

Ive searched extensivly for the correct fitting. Only place I could find it was ZZP.

Autometer sells adapters for 1/8" NPT but those are also brass.

None of the other oens I find are Male m12x1.75 to male -4AN

ZZP said that because of the size of the engine block, that galvanic corrosion
is a non-issue. Can anyone who knows alot more about corrosion then I do comfirm this?
Im inclined to beleive them, because I would imagein that if they did cause a problem
ZZP would have aluminum ones instead.

In the mean time Ill talk to google and see what comes up.

 

Ok I did some more research, and my findings from google confirm ZZP.
Galvanic series
This chart, and most that Ive found, show that Aluminum is more Anodic
then brass. However, when compareing the size of an aluminum block
to the size of a brass fitting...

We see that the corrosion would be negilable.

 

You're talking a very small fitting compared to some older cars that had aluminum heads and used copper radiator cores (with copper being the key element in a brass/bronze alloy) and those didn't run into severe issues even on older coolants. You shouldn't have any problems from one small fitting as long as you keep fresh coolant in the system which has corrosion inhibitors for things like this. Many coolant temp sensors which are about the same size are also made from brass and still used in both all-aluminum and bi-metal (aluminum head/iron block) engines.

Even if you were running near straight water in a race-only application I wouldn't worry too much about it. If you were talking something like a (completely non-feasible but just for example) brass cylinder head on an aluminum block I'd be much more concerned, but in this application that you're talking about I'd be even more concerned about the physical strength of an aluminum fitting after tons of heat cycles and the threads more prone to stripping than I would about it being made from brass.

 

Okay, thanks for the info. I started to feel better about it, until today, I was looking at an extra brass T fitting that I have.


When Looking at this today, after it being left in my living room, not excessivly humid or exposed to anything other then normal household air, I noticed when takeing the cap off, corrosion on the threads under the cap. But both are Brass. This somewhat worries me because I used an identical fitting to connect my Fuel rail to a hose for my fuel pressure sensor. Ill have to find another adapter or remove the thing entirly.

 

I'm trying to install an oil pressure gauge. I have ZZP's brass m12x1.75 to #4AN fitting. The only one I can find online is from ZZP and it's brass. So I would imagine that the presence of oil will help impede corrosion. But in the case of a "Brass" Cylinder head on an Aluminum Block, the Head Gasket would for the most part isolate the two metals anyway woudlnt it?
So Im ok to proceed with my oil pressure set up, ill have to give my fuel pressure setup another look at. I just need a block of metal with wich to make an all female M12x1.75 T fitting. or 2 female 1/8"NPT and 1 female M12x1.75