vanster

If you are considering an intake refresh, also consider the perils of powder coating
Getting all of the media out of the intake can be challenging and sometimes fatal.
No captions required

Randy V

Yours?

That's a shame.

jeff spahn

I like the hand rubbed finish on the pistons. The lower weight rings must increase piston speed and reduce time to redline?
Oh, and sorry for your loss.

Adk46

My intake is out for powder coating right now. They guy talked about how he would be masking off the openings, and also cleaning. I was planning to do my own cleaning, but I will now take it even more seriously. Thanks for posting this.

James Bailey

Sadly far from being the FIRST such event....I recall several !! But then again I used to hear from thousands of 928 Owners most of whom had problems !

davek9

Do you know what type of cleaning was performed before assembly?

James Bailey

not enough......

vanster

I scrubbed it with mineral sprits, towels, compressed air for about and hour.
I'm under the impression that the 86.5 5.0 motors with the long no flapper manifolds have more hidden area's for media to hang out in. Best bet is to mask it first, have a conversation with the shop that is doing it.
Makes painting it with a rattle can look like a better bet

Lizard928

Sorry to see/hear.
One has to make 100% sure there are zero particulates left.

I don't mask off any of it, as if you mask it, it is more likely you aren't going to take the time to ensure everything is 100% out.

bureau13

Well that's settled....rattle can it is for me!

Don Carter

I did my 86.5 about 5 years ago and haven't noticed any issues yet. As I remember most pieces were very straight forward to clean. I put a lot of time into cleaning them, but it sounds like you did too. Maybe I should look at the cylinders with my inspection camera.

How many miles did you put on it before the issues were noticeable?

bureau13

This is blast media, from the cleaning process? Or something from the actual powder coating process? If the former, which media did you use?

vanster

According to Greg it's the blast media as he found a grey slurry in the oil then he put a camera down the hole.
It ran good for the first 150 miles then it turned pear shape

zekgb

Is there corresponding damage to the cylinder walls? Was the damage consistent in all cylinders?

I'm pretty sure my powder coater didn't effectively mask the driver's side plenum, and this is what was coming out even after four wash/brush/rinse cycles. I finally had to put my hand inside the plenum and feel the backside of the #5 runner to find where most of it was hiding. I also found media at the base of the vacuum port which didn't come out without manual persuasion with a brush.


Seeing your pictures will prompt me to triple check that I got everything before I seal my engine back up.

Simon928

That sucks man, my sincere condolences. If it happened to me I would probably slink away quietly in shame and never tell anyone, but props to you for informing the community about the cause and the consequences. I can almost guarantee that this info will save some engines from suffering a similar fate in the future.