Notices
928 Forum 1978-1995
Sponsored by:
Sponsored by: 928 Specialists

Powder coating = engine rebuild

Thread Tools
 
Search this Thread
 
Old 02-07-2016, 10:22 PM
  #46  
Jherriott
Rennlist Member
 
Jherriott's Avatar
 
Join Date: Mar 2010
Location: Toronto, Ontario
Posts: 662
Received 5 Likes on 4 Posts
Default

One of those SeeSnake Micro Inspection Cameras from Home Depot or something similar from a plumber buddy would be good before the final button up of the intake...
Old 02-08-2016, 07:47 AM
  #47  
stuartph
Pro
 
stuartph's Avatar
 
Join Date: Nov 2002
Location: UK
Posts: 552
Likes: 0
Received 0 Likes on 0 Posts
Default

I had a report carried out on an oil sample from my old gt , showed silicone in it , guess that's what the company used for media blasting on the intake , oh dear
Old 02-08-2016, 11:26 AM
  #48  
Imo000
Captain Obvious
Super User
 
Imo000's Avatar
 
Join Date: Aug 2003
Location: Cambridge, Ontario, Canada
Posts: 22,846
Received 337 Likes on 244 Posts
Default

Can these parts be successfully powder coated without media blasting them?
Old 02-08-2016, 12:11 PM
  #49  
bureau13
Rennlist Member
 
bureau13's Avatar
 
Join Date: May 2014
Location: South Florida
Posts: 3,478
Received 55 Likes on 42 Posts
Default

The old finish seems on mine seems to be flaking off itself so easily, I can't imagine the rest of it will be hard to remove, but I haven't actually tried it yet...

Originally Posted by Imo000
Can these parts be successfully powder coated without media blasting them?
Old 02-08-2016, 04:33 PM
  #50  
kmascotto
Rennlist Member
 
kmascotto's Avatar
 
Join Date: May 2012
Location: Ontario Canada
Posts: 1,111
Received 0 Likes on 0 Posts
Default

I took the coating off my intake with 2000psi of water pressure
Old 02-09-2016, 08:20 AM
  #51  
Adk46
Rennlist Member
 
Adk46's Avatar
 
Join Date: Aug 2014
Location: Adirondack Mountains, New York
Posts: 2,398
Received 310 Likes on 161 Posts
Default

I'm standing by for the return of my intake with these items. I may chuck up the brush in a cordless drill and whip it, whip it good.



Old 02-09-2016, 09:58 AM
  #52  
Imo000
Captain Obvious
Super User
 
Imo000's Avatar
 
Join Date: Aug 2003
Location: Cambridge, Ontario, Canada
Posts: 22,846
Received 337 Likes on 244 Posts
Default

With this much risk, I wouldn't take a chance power coating anything in the intake path.
Old 02-09-2016, 10:38 AM
  #53  
Adk46
Rennlist Member
 
Adk46's Avatar
 
Join Date: Aug 2014
Location: Adirondack Mountains, New York
Posts: 2,398
Received 310 Likes on 161 Posts
Default

Originally Posted by Imo000
With this much risk, I wouldn't take a chance power coating anything in the intake path.
The risk is in not knowing the risk, or failing to take it seriously enough.

My coating guy is going to blank off the openings. He's going to wash it afterwards anyway. Twice. I'm going to wash it again, and inspect it thoroughly.

I had an experience many years ago with grit in the works. A clumsy mechanic broke off a spark plug and pieces fell down inside. He used an air line to blow it out, but the intake valve happened to be open on that cylinder so the grit blew into the intake. All four cylinders got chewed up. The shop denied that this is how it happened, but there was no other way. Change spark plugs = new engine? No, but there's a special need to be careful with spark plugs that some may not recognize.
Old 02-09-2016, 11:45 AM
  #54  
WallyP

Rennlist Member
Rennlist Site Sponsor

 
WallyP's Avatar
 
Join Date: Jun 2001
Location: Acworth, GA
Posts: 6,469
Likes: 0
Received 11 Likes on 11 Posts
Default

I removed the factory top-coat on my '90 GT intake with plastic scrapers. Took less time than trying in vain to remove abrasive from hidden parts of the intake. Rattle can molten silver wheel paint looked good enough for me.

In my opinion, the risk isn't worth the reward...
Old 02-09-2016, 12:45 PM
  #55  
GregBBRD
Rennlist
Basic Site Sponsor
 
GregBBRD's Avatar
 
Join Date: Feb 2005
Location: Anaheim
Posts: 15,221
Received 2,458 Likes on 1,460 Posts
Default

Too much "here's the way I did it, therefore it must be correct".

The point is simple. Regardless of your methods, who does it, how it is done...anything left in the intake system goes directly into the engine and can cause damage.

Make sure your intake is perfectly clean.

Done.
__________________
greg brown




714 879 9072
GregBBRD@aol.com

Semi-retired, as of Feb 1, 2023.
The days of free technical advice are over.
Free consultations will no longer be available.
Will still be in the shop, isolated and exclusively working on project cars, developmental work and products, engines and transmissions.
Have fun with your 928's people!





Old 02-09-2016, 02:19 PM
  #56  
Speedtoys
Rennlist Member
 
Speedtoys's Avatar
 
Join Date: Sep 2010
Location: Boulder Creek, CA
Posts: 13,582
Received 1,034 Likes on 623 Posts
Default

Originally Posted by Imo000
With this much risk, I wouldn't take a chance power coating anything in the intake path.
Why not..Porsche did..and they had to CLEAN it.


Amazing all of the hysterics over this..if you miss "cleaning" in any motor assembly step, you're asking for a problem.

Just CLEAN things...
Old 02-09-2016, 02:24 PM
  #57  
bureau13
Rennlist Member
 
bureau13's Avatar
 
Join Date: May 2014
Location: South Florida
Posts: 3,478
Received 55 Likes on 42 Posts
Default

Is that factory finish really a powder coat? I'm surprised it flakes off so badly, even after this much time, if it is...

Originally Posted by Speedtoys
Why not..Porsche did..and they had to CLEAN it.


Amazing all of the hysterics over this..if you miss "cleaning" in any motor assembly step, you're asking for a problem.

Just CLEAN things...
Old 02-09-2016, 08:28 PM
  #58  
Jherriott
Rennlist Member
 
Jherriott's Avatar
 
Join Date: Mar 2010
Location: Toronto, Ontario
Posts: 662
Received 5 Likes on 4 Posts
Default

I'm curious now about the factory intake. Does it have ANY kind of coating on the inside of the intake? So, in other words... are these people removing and recoating the insides of the intake because the factory did? Or is the problem the poor procedure of the removal of the exterior coating that leads to debris stuck on the inside?

My car was already done by Alex "Ghandi" Gandeski; the previous owner. In any other case I might be worried... but if any or you know Alex... You know it's CLEAN! :P

Jase.
Old 02-09-2016, 09:14 PM
  #59  
Speedtoys
Rennlist Member
 
Speedtoys's Avatar
 
Join Date: Sep 2010
Location: Boulder Creek, CA
Posts: 13,582
Received 1,034 Likes on 623 Posts
Default

Originally Posted by bureau13
Is that factory finish really a powder coat? I'm surprised it flakes off so badly, even after this much time, if it is...
Even if its just paint...it flakes because the metal the intake is made of..doesn't like things stuck to it once it gets contaminants in it.

But either way..it was cast in sand, and then _cleaned_.

It's not that hard, it just needs done. WAY too much doom and gloom in here over cleaning something.

Some versions are harder than others, and will just require being blasted a different way.
Old 02-09-2016, 09:15 PM
  #60  
Speedtoys
Rennlist Member
 
Speedtoys's Avatar
 
Join Date: Sep 2010
Location: Boulder Creek, CA
Posts: 13,582
Received 1,034 Likes on 623 Posts
Default

Originally Posted by Jherriott
I'm curious now about the factory intake. Does it have ANY kind of coating on the inside of the intake? So, in other words... are these people removing and recoating the insides of the intake because the factory did? Or is the problem the poor procedure of the removal of the exterior coating that leads to debris stuck on the inside?

My car was already done by Alex "Ghandi" Gandeski; the previous owner. In any other case I might be worried... but if any or you know Alex... You know it's CLEAN! :P

Jase.
The S4+ intake, at least, was coated, and flakes off..you'll be missing some if you have one and pull it.


Quick Reply: Powder coating = engine rebuild



All times are GMT -3. The time now is 11:07 PM.