2.5L race motor build picture

[Plavan]

There will be more to follow. But this is all I have right now to post. The thing looks sweet. I can't wait! More to come.

[Plavan]

Another of the internals.

[Andras]

Hi Chad,

A couple of quick questions:

1. The case looks very clean and almost as if you'de had it media blasted. I've never seen an 911SC case this clean. Hpw'd you do it?

2. Are those Pelican Parts chain holders? I did my engine without them, and had to "fish" out the chains when I rotated the engine. These must make the work very easy?

3. Whose studs are they? I used the factopry 993 studs on the exhaust, but mine were not yellow like yours.

[jpnovak]

Pretty. I love a clean engine. What method did you use on the case? Wire bursh and solvent?

Andras, I think he is using an early Al case, not an SC case.

the studs have been yellow zinc(or cad, I can't quite tell from the pic) coated.

[Plavan]

Andras,
The case was hot tanked and cleaned really good. The aluminum cases will clean up nicely. Allan at Aase did a great job cleaning it up. I think that media blasting a case would cause way to many problems. I do not know of anyone that would recommend that. All that "stuff" would get everywhere you do not want it.
I media blasted the inside of my race car. I had sand coming out a year after. My first time out in the new race car it was like a sandstorm in Iraq. When the race was over the whole tub of the car looked like a beach. I removed probably 5 pounds or more of sand that first run, 4 the next and so on.

Those are the basic chain/rod holders. Should be very similar to what is sold on this site.

The studs are OEM Porsche that were zinc coated with all the other hardware (engine tin bolts etc). We sent these off to get them coated. It will look great when its all finished

[Plavan]

For reference- This is the exact same case when it was being built by a previous mechanic a few years back. It is no where near as clean as it is now. There is a big difference. Some guys take pride in their work. Some others just want to get it done.

[Jeff Jagusch]

Hi Chad,
The photos look very nice, I'm starting on a similar project.
I just wanted to get your thoughts on zinc plating the studs.
I understand that the plating process can lead to Hydrogen embrittlement. I realize that careful baking after plating can eliminate this, but I'm not sure it's worth the risk on such a critical part?
They do look nice though!

????

Jeff

[Plavan]

Hmm... Not sure, but these Aase guys have been doing it for awhile without any failures. Good question though.

[Jeff Jagusch]

Hi Chad,
I talked to our QC guy at the fastner company we represent.
We need a plating expert to chime in.....
My understanding is that to have parts plated, they are first cleaned with HCL. This lets Hydrogen get into the steel.
The parts must be baked after plating to remove the Hydrogen. The baking must be done within a specified timeline.
He also told me that as the hardness increases, the parts are MORE suseptable to embrittlement. Anything over Rc30 needs to be baked. I suspect the studs are much harder than that.
I'm not saying that you have ruined your studs, but depending on the plating shop and their quaility control?????

Maybe I'm all wet as well???

I don't mean to come off a a jerk, just find this stuff interesting, as I am planning a similar rebuild, and love the look of your engine, but would hate to see you have a problem that could cause a failure.

Jeff

[Plavan]

Allan may chime in here. They sent them off to be zinc coated. They have done it in the past. I'm not worried because they do it all the time.

[jgparker]

I've never heard of a steel head stud breaking, except in the case of a thrown rod. I doubt the plating would make a difference.

[Plavan]

I went by the shop yesterday. Allan hot tanks the case then uses a pneumatic wire brush under the parts cleaner solvent. Then cleans it again. Nice super shiney clean case.

[keitho64]

Chad
Sorry if this has been covered but I would love to know the details of this buildup. What is the case, rods, pistons, cams and heads that you are using?

Thanks

[Plavan]

No problem. Here they are.
The internals: 1967 alum case bored out spigots, piston squirters, oil bypass mod, bearing mod, Std/Std counterwieghted 2.0L crank, 2.0L rods, ARP rod bolts, Carrera oil pump, Boat tailed, Mooned cylinders, 89 MM Mahle cylinders replated, 89mm J&E pistons 10.5:1, GE80 profile cams, Stock 2.7 valves, Heads ported and polished, 37mm intake, 39mm exhaust, CIS ports welded up, EBS racing springs with ti retainers, 46mm PMO carbs with their new super tall manifolds, plus all new zinc dipped hardware and powder coated goodies

[al lkosmal]

Chad,
that looks awesome. Want you to know that i'm putting the JE's to good use. Also i've been out in the garage wirebrushing the case of my 2.7 rebuild. It's almost as shiny as yours.

Al

[Plavan]

Al,
Let's see your motor build thread soon

[al lkosmal]

Coming to a BBS near you soon.

[BigD9146gt]

OOOOOOOOO , me likey, so pretty!

[Plavan]

More Porsche porn. Almost there!

[126coupe]

Looks great Chad! Lets do some dicing on friday at Willow before the next event!