OPM928

Happy Australia Day for those Down Under.

I'm currently planning an intake refresh and powder coat for an Organ Pipe 32V intake/cam covers.

There are several recommendations here on Rennlist to only use a recognised 928 experienced powdercoater (eg http://www.scott-yoo.com/other/intake.html which sounds eminently sensible, but that's a long way from here and I know others in Australia are happy with their PC jobs.

I thought I'd ask here if anyone in Australia has had a good experience with a local powdercoater (preferably in S.E Qld)?

Speedtoys

Just ask who would do a magnesium alloy. Has nothing to do with 928 experienced.

A good shop knows what you're talking about. The good plan is asking who is local, or calling and asking.

I found some "OMG NO!" and others "Ya, done right, we can work with that..."

JET951

We send all our magnesium alloy inlet manifolds & twin cam cam covers ( rocker covers ) be it 928S 1986 5.0L ( like you're one ) , 928S4 / GT/ GTS / 944S( cam cover & manifold) & 944S2( just cam cover) to HPC in Victoria

In the final finish ( after stripping & treatments ) we get the inside of the inlet manifolds done in their DF2 non wettable matrix coating ( quite important ) & we get the undersides of the cam covers in the same

On the outside , we get the silver appearance coating , looks just like when these cars were new all those decades ago

If you want to go one step further , we send as many of the engine bay mild steel components that when new were in the gold look chromate finish new , like engine lift brackets , accelerator linkages & brackets , nuts , bolts , washers , bonnet hinges & catches & bonnet hinges , air intake tube clamps , fuel pipes etc etc etc to be re-plated in the yellow gold Zinc plating ( different company )

In combo with the HPC restoration inlet manifold & cam covers , the engine bays in these cars come up looking fantastic

Note } HPC = High Performance Coatings

DeWolf

Pretty happy with mine.

OPM928

Looking good DeWolf. If lurkers are wondering, I've had some other conversations with DW about his intake - but no pictures until now! Where's the P-badge going?

Speedtoys - that sounds like a top tip that might help me decide between local or something a bit further afield. Speaking of which, JET951 - wow. I've just checked out your facebook page and would have to say your recommendation is definitely in pole position.

928Myles

OPM928
I sent mine to HPC in NZ and have been very happy with the job - no sign of issues several years later. I see their Aussie cousins have been endorsed above so your should be happy with them.

Myles

Adk46

I was going to suggest a desert yellow color, but it seems I misunderstood the question.

Dave928S

I rang HPC a few years ago inquiring specifically about 928's. They seemed to be unaware of the specific requirements for our parts, and they couldn't even give me a rough estimate of price. Perhaps I spoke to the wrong person, and you have a specific contact person, but I wasn't confident to use them based upon their lack of knowledge.

What preparation do you do before sending them off to HPC, and do you need to do anything when you get them back? .... in other words do they do 'everything'?

JET951

Hi Dave I think you went about it in a slightly too refined way , I do not think I have ever mentioned to the guy's at HPC that the inlet manifolds we send them , including the twin cam cam covers ( all magnesium alloy ) are from anything other than a Porsche , I have never ever bothered with the model or description or anything , I just mention what the material is ( what type of metal ) and what I want done in regards to the colours ( external ) needed

It was HPC who first put me onto what the DF2 non wettable matrix coating will do ( this is done on the inside of the manifolds & underside of the cam covers )

So as far as they are concerned , over the years they have refurbished lots of magnesium manifolds , be it from the M28 45/46 or the 928S4/GT/GTS and hundreds of twin cam covers , be it 944S , 944S2 , 928M2845/46 or the S4 / GT / GTS & all they know from what I have told them is that they are from a Porsche

They just want to know what the metal is & the rest just flows from there

JET951

Hi Dave I think you went about it in a slightly too refined way , I do not think I have ever mentioned to the guy's at HPC that the inlet manifolds we send them , including the twin cam cam covers ( all magnesium alloy ) are from anything other than a Porsche , I have never ever bothered with the model or description or anything , I just mention what the material is ( what type of metal ) and what I want done in regards to the colours ( external ) needed

It was HPC who first put me onto what the DF2 non wettable matrix coating will do ( this is done on the inside of the manifolds & underside of the cam covers )

So as far as they are concerned , over the years they have refurbished lots of magnesium manifolds , be it from the M28 45/46 or the 928S4/GT/GTS and hundreds of twin cam covers , be it 944S , 944S2 , 928M2845/46 or the S4 / GT / GTS & all they know from what I have told them is that they are from a Porsche

They just want to know what the metal is & the rest just flows from there

OPM928

Adk46, That would be funny - if that weren't the original colour already... Maybe those Germans were on to something.

To tie a few comments together - there is a HPC in Brendale (Brisbane) that may or may not have any affiliations to the Vic or NZ ones. They certainly share the Vic's dislike of an informative web site. I plan on giving them both a call soon. I'll report back my findings. Suffice to say all I'll be doing is dropping some key words from this thread and see how I go...

JET951

Just thought of something that could be of interest , sometimes we see magnesium alloy inlet manifolds & twin cam cam covers that have been on cars in poor condition ( lack of original protective paint ) and the car in question has been driven / parked / used in salt air conditions ( within 10 to 15 kms ) of the coast ( salt air ) for years & when these magnesium alloy parts are stripped back & all the corroded pits / craters caused by the magnesium alloy corroding to dust ( like a rotted out tooth ) these small craters / corrosion holes can not welded & they have to stay as is , all that can be done is the stabilisation of the very unstable metal

Dave928S

Thanks for the reply Bruce ... that explains the vagueness. Do they mask off the appropriate areas, and do you have to do anything at all when you get them back, other than double checking (clean/complete/etc) and bolting on?

Adk46

Regarding pits: the guy who is presently doing my intake/top end parts offered to smooth over my pitted water bridge nozzle with some kind of JB Weld, which he said would hold up during powder coating. The nozzle is aluminum, so not entirely relevant. Worst case for magnesium is that the JB Weld reacts with it, which starts to burn; you lose your manifold and the powder coater loses his shop. "Try product in inconspicuous area before using."

928Myles

Dave,
I get several parts done (Intake, cam covers, water bridge, thermostat cover, alloy expansion tank IIRC). Everything came back clean and needed no preparation before assembly. All areas that needed to be left uncoated were so. The NZ branch is familiar with 928's (They were doing one when I rang to inquire) so I had to proffer very little instruction other than colours.

https://rennlist.com/forums/attachme...er-coating.jpg

Myles