Turbocharged '92 BMW 525i *Updated
#142
Re: Turbocharged '92 BMW 525i *Updated
The pistons are now ceramic coated with TechLine Cerakote CBC1 coating - was fairly painless, though
getting it to spray through one of various guns was a challenge. One piston was either not aluminum oxide
blasted enough or had some oil still on it, and it had a small spot that bubbled, and is going to be re-coated.
Otherwise, they came out real well!
They had a slight little "lip" to the finish since they were masked then sprayed. Using a yellow scotchguard pad, the lip is
easily removed with very little rubbing (it isn't bonded to metal so it moves from the object).
Here is a pic with slight lip:
All cleaned up:
getting it to spray through one of various guns was a challenge. One piston was either not aluminum oxide
blasted enough or had some oil still on it, and it had a small spot that bubbled, and is going to be re-coated.
Otherwise, they came out real well!
They had a slight little "lip" to the finish since they were masked then sprayed. Using a yellow scotchguard pad, the lip is
easily removed with very little rubbing (it isn't bonded to metal so it moves from the object).
Here is a pic with slight lip:
All cleaned up:
#144
Re: Turbocharged '92 BMW 525i *Updated
I finally have something that might be considered "home made turbo" style!
I soda blasted (baking soda + water @ high pressure) my cyl head as I mentioned before, and now doing head assembly I wasn't satisfied that all the soda was out with hosing the head down over and over. So, boil me up 3 pots of water, and turn the bath tub to HOT, and till it up!
after doing this three times letting it air dry after each, I am satisfied that all of it is dissolved (soda dissolves, in time, in water).
Prior, if I hosed the head down/out, I would let it dry and see some white residue where the water ran out... and it bugged me to think there might be ---- in the head. So, taken care of!
I soda blasted (baking soda + water @ high pressure) my cyl head as I mentioned before, and now doing head assembly I wasn't satisfied that all the soda was out with hosing the head down over and over. So, boil me up 3 pots of water, and turn the bath tub to HOT, and till it up!
after doing this three times letting it air dry after each, I am satisfied that all of it is dissolved (soda dissolves, in time, in water).
Prior, if I hosed the head down/out, I would let it dry and see some white residue where the water ran out... and it bugged me to think there might be ---- in the head. So, taken care of!
#145
Re: Turbocharged '92 BMW 525i *Updated
for the engine i was going to build before i ran out of time, i took the head to a self car wash place and hammered it with degreaser and waterblaster alternately, worked a treat, then just a good spray of crc/wd40 to stop the corrosion happening, and you are away. nice hot tanking though :-)
#146
Re: Turbocharged '92 BMW 525i *Updated
Originally Posted by fe3tcourier
for the engine i was going to build before i ran out of time, i took the head to a self car wash place and hammered it with degreaser and waterblaster alternately, worked a treat, then just a good spray of crc/wd40 to stop the corrosion happening, and you are away. nice hot tanking though :-)
Soda blasting is SO good though, it was worth the pain.
#148
Re: Turbocharged '92 BMW 525i *Updated
Originally Posted by fe3tcourier
i did read what you wrote. was just suggesting another alternative, got a link to something about doing that? i'm curious.
fred.
fred.
It just so happens my friends shop has an enclosed soda blasting cabinet - I spent an hour figuring out how it worked and then another 1 hr blasting. There's not much to it - the concept behind the soda is that as the baking soda hits the head at high velocity it blows apart, so it's actually a chemical reaction versus being a straight abrasive.