While I was replacing the bolts, I took the small heat shield off that is protecting the injector wiring looms, cleaned it up, sprayed it with etch primer then painted it silver with wheel paint (which is what I also did to the heads of the high tensile forged bolts in the L/H engine mount casting, removing them one at a time).......
www.marshfasteners.com
The vast majority of the bolts are into captive steel nuts in the plastic plenum chamber or the car body and not into aluminium and as you point out water is needed on the others to create a corrosive electrolyte. This is not on a bike engine that gets wet regularly.......Warning noted, but I doubt that I will have problems in this case...I will check the few on the front of the engine in a few weeks and see if there is any corrosion developing....oh goody, stainless in an aluminium block. just add heat and water.
there is a reason they aren't stainless from the factory, galvanic corrosion is very real and not very easy to deal with. PO of my bike decided stainless exhaust bolts was a good idea. I've now replaced them, along with thread inserts and tig welding one of the bolt holes full and retapping.
Can Stainless Steel and Aluminum Be Used Together?
When aluminium makes contact with stainless steel fasteners, corrosion can occur. However, the two metals can be used together, read more!
bright zinc is a better idea, it won't last as long but it also wont cease itself in the hole.
(note, sorry if these sounds passive aggresive or troll like, it isn't meant to be, it's a genuine warning about why it's a bad idea).
I have these A2 stainless square nuts coming and they will replace the grubby steel one in the plastic plenum chamber.....all power to you Chief, was just a word of warning having been there more than once on both cars and bikes.
they do look much tidier than the scruff under my bonnet.
Hi Mika, I used flanged bolts as well but 'mine' don't have the serrations under the head....Moi John!
Been doing same with: M6 FLANGED HEXAGON HEAD BOLTS FLANGE HEX SCREWS A2 STAINLESS STEEL FULLY THREAD
No seperate washer needed, and flange 'plugs' moisture/corrosion on threads
