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2.5L race motor build picture

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.
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Chad Plavan
911ST Race Car/2.5L SS Race Motor #02
1972 911T- Numbers matching- Restoring to stock
2011 Porsche Spyder Wht/Blk/Carbon Fiber Buckets/6-Speed (Sold)
2016 Elan NP01 Prototype racecar- Chassis #20, #02
Old 10-24-2004, 01:47 PM
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Another of the internals.
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Chad Plavan
911ST Race Car/2.5L SS Race Motor #02
1972 911T- Numbers matching- Restoring to stock
2011 Porsche Spyder Wht/Blk/Carbon Fiber Buckets/6-Speed (Sold)
2016 Elan NP01 Prototype racecar- Chassis #20, #02
Old 10-25-2004, 08:50 AM
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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.
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Old 10-25-2004, 08:54 AM
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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.
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Old 10-25-2004, 09:01 AM
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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
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Chad Plavan
911ST Race Car/2.5L SS Race Motor #02
1972 911T- Numbers matching- Restoring to stock
2011 Porsche Spyder Wht/Blk/Carbon Fiber Buckets/6-Speed (Sold)
2016 Elan NP01 Prototype racecar- Chassis #20, #02
Old 10-25-2004, 09:12 AM
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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.
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Chad Plavan
911ST Race Car/2.5L SS Race Motor #02
1972 911T- Numbers matching- Restoring to stock
2011 Porsche Spyder Wht/Blk/Carbon Fiber Buckets/6-Speed (Sold)
2016 Elan NP01 Prototype racecar- Chassis #20, #02

Last edited by Plavan; 10-25-2004 at 09:34 AM..
Old 10-25-2004, 09:22 AM
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looks great!

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
Old 10-25-2004, 10:46 AM
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Hmm... Not sure, but these Aase guys have been doing it for awhile without any failures. Good question though.
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Chad Plavan
911ST Race Car/2.5L SS Race Motor #02
1972 911T- Numbers matching- Restoring to stock
2011 Porsche Spyder Wht/Blk/Carbon Fiber Buckets/6-Speed (Sold)
2016 Elan NP01 Prototype racecar- Chassis #20, #02
Old 10-25-2004, 10:51 AM
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just enough to be dangerous!

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
Old 10-25-2004, 01:57 PM
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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.
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Chad Plavan
911ST Race Car/2.5L SS Race Motor #02
1972 911T- Numbers matching- Restoring to stock
2011 Porsche Spyder Wht/Blk/Carbon Fiber Buckets/6-Speed (Sold)
2016 Elan NP01 Prototype racecar- Chassis #20, #02
Old 10-25-2004, 03:11 PM
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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.
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Old 10-25-2004, 04:07 PM
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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.
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Chad Plavan
911ST Race Car/2.5L SS Race Motor #02
1972 911T- Numbers matching- Restoring to stock
2011 Porsche Spyder Wht/Blk/Carbon Fiber Buckets/6-Speed (Sold)
2016 Elan NP01 Prototype racecar- Chassis #20, #02
Old 10-26-2004, 07:32 AM
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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
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Old 10-28-2004, 08:10 PM
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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
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Chad Plavan
911ST Race Car/2.5L SS Race Motor #02
1972 911T- Numbers matching- Restoring to stock
2011 Porsche Spyder Wht/Blk/Carbon Fiber Buckets/6-Speed (Sold)
2016 Elan NP01 Prototype racecar- Chassis #20, #02
Old 10-28-2004, 08:13 PM
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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
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Old 10-29-2004, 10:23 PM
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Al,
Let's see your motor build thread soon
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Chad Plavan
911ST Race Car/2.5L SS Race Motor #02
1972 911T- Numbers matching- Restoring to stock
2011 Porsche Spyder Wht/Blk/Carbon Fiber Buckets/6-Speed (Sold)
2016 Elan NP01 Prototype racecar- Chassis #20, #02

Last edited by Plavan; 10-30-2004 at 06:13 PM..
Old 10-30-2004, 07:59 AM
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Coming to a BBS near you soon.
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[B]Current projects: 69-911.5, Previous:73 911X (off to SanFrancisco/racing in Germany).77 911S (NY), 71E (France/Corsica), 66-912 ( France), 1970 914X (Wisconsin) 76 911S roller..off to Florida/Germany
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Old 10-30-2004, 10:23 AM
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OOOOOOOOO , me likey, so pretty!
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Old 10-30-2004, 10:54 AM
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More Porsche porn. Almost there!
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Chad Plavan
911ST Race Car/2.5L SS Race Motor #02
1972 911T- Numbers matching- Restoring to stock
2011 Porsche Spyder Wht/Blk/Carbon Fiber Buckets/6-Speed (Sold)
2016 Elan NP01 Prototype racecar- Chassis #20, #02
Old 10-30-2004, 06:10 PM
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Looks great Chad! Lets do some dicing on friday at Willow before the next event!
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Old 11-01-2004, 07:30 AM
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