Parts porn: pics of a GTS crank & S4/968/beyond pistons
#46
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#47
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Like I said, I completely respect what Devek did, in the past. He's always seemed like a stand-up guy, to me. I've read all the problems that people claim to have had and crap like that, but I have very limited personal experience, so this is all just "ugly rumors" to me. Certainly he has his opinions and I have mine...which should be a good thing, in the development world. No one person is going to know everything.
I just happen to think that things have evolved, in the past 10 years.
Last edited by GregBBRD; 08-13-2009 at 04:52 AM. Reason: Too tired to think properly.
#49
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That's a really good question. I am also wondering at how much risk these transmissions really are on street tires. I understand that if one catches air with slicks on track and lands with full throttle open on a 600 ft-lbf engine, the tranny's going to give. But how about with taking off from a traffic light with street tires?
#50
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Greg,
DEVEK cranks were not made from Chinese steel. It was considered for cost reasons but rejected due to potential quality issues. I have been working in China for over 25 years and know their heavy industries well. Don't assume.
To date, none of the 50 or so Devek cranks has "broke", although one did develop a surface crack when Don ran his engine out of oil but kept spinning the engine at 6K. Broke everything else though!
No engine builder ever complained of a soft crank journal.
You are the only one.
DEVEK cranks were not made from Chinese steel. It was considered for cost reasons but rejected due to potential quality issues. I have been working in China for over 25 years and know their heavy industries well. Don't assume.
To date, none of the 50 or so Devek cranks has "broke", although one did develop a surface crack when Don ran his engine out of oil but kept spinning the engine at 6K. Broke everything else though!
No engine builder ever complained of a soft crank journal.
You are the only one.
#52
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Greg,
DEVEK cranks were not made from Chinese steel. It was considered for cost reasons but rejected due to potential quality issues. I have been working in China for over 25 years and know their heavy industries well. Don't assume.
To date, none of the 50 or so Devek cranks has "broke", although one did develop a surface crack when Don ran his engine out of oil but kept spinning the engine at 6K. Broke everything else though!
No engine builder ever complained of a soft crank journal.
You are the only one.
DEVEK cranks were not made from Chinese steel. It was considered for cost reasons but rejected due to potential quality issues. I have been working in China for over 25 years and know their heavy industries well. Don't assume.
To date, none of the 50 or so Devek cranks has "broke", although one did develop a surface crack when Don ran his engine out of oil but kept spinning the engine at 6K. Broke everything else though!
No engine builder ever complained of a soft crank journal.
You are the only one.
Like I said, things evolve over a period of 10+ years, and that's a good thing.
Just as a point of reference, how many of those 50 cranks do you suppose are actually in engines that are running, today? Not sitting in a garage, in a car that never gets driven, because of various reasons, but actually running and being used, in anger....on a daily basis? Not sitting on a shelf, waiting for someone's "pipe dream" to come true?
I sure have a tough time counting past a hand full.....
#53
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It would be good to see that mystery soft DEVEK crank and its measured journal hardness (Rc) number, and of course, its newly discussed cousin. Knowing that the journals are hardened before final grinding makes me a bit suspect...but anything is possible.
Did Taylor machine do the balancing...? Who can I talk to about it?
I am guessing all but 6 are running, assuming you have two that are not in use, and I still have my cranks.
Please send those "few dozen" folks my way, I will gladly build the engines for them!
Did Taylor machine do the balancing...? Who can I talk to about it?
I am guessing all but 6 are running, assuming you have two that are not in use, and I still have my cranks.
Please send those "few dozen" folks my way, I will gladly build the engines for them!
#54
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OK, time for some seriously hardcore parts ****. (Larry Flynt might think twice about publishing these) Here are some pics I took of the 4.0L RSR motor that was in the Brumos Porsche Daytona Prototype that won the 24hrs of Daytona this year.
DLC coating on cylindrical lifters
![](http://www.jeepvideos.com/mpeg/pics/090816-historics/DSC_0042web.JPG)
Keyed lifter bores for cylindrical lifters
![](http://www.jeepvideos.com/mpeg/pics/090816-historics/DSC_0043web.JPG)
ITB
![](http://www.jeepvideos.com/mpeg/pics/090816-historics/DSC_0044web.JPG)
![](http://www.jeepvideos.com/mpeg/pics/090816-historics/DSC_0046web.JPG)
Just a little duration on these cams
![](http://www.jeepvideos.com/mpeg/pics/090816-historics/DSC_0049web.JPG)
Gun-drilled cams
![](http://www.jeepvideos.com/mpeg/pics/090816-historics/DSC_0053web.JPG)
Another shot of lifters
![](http://www.jeepvideos.com/mpeg/pics/090816-historics/DSC_0054web.JPG)
Piston in steel liner (I think so they could run 102.7mm pistons & push displacement up to 4.0L. Previous gen 3.8L Cup motors use Nikasil?)
![](http://www.jeepvideos.com/mpeg/pics/090816-historics/DSC_0058web.JPG)
Heads
![](http://www.jeepvideos.com/mpeg/pics/090816-historics/DSC_0061web.JPG)
Del West Ti valves w/ beryllium-copper seats?
![](http://www.jeepvideos.com/mpeg/pics/090816-historics/DSC_0062web.JPG)
![](http://www.jeepvideos.com/mpeg/pics/090816-historics/DSC_0067web.JPG)
Intake plenum
![](http://www.jeepvideos.com/mpeg/pics/090816-historics/DSC_0070web.JPG)
2-ring pistons w/ DLC pin. 346.6 grams!
![](http://www.jeepvideos.com/mpeg/pics/090816-historics/DSC_0073web.JPG)
Main bearings
![](http://www.jeepvideos.com/mpeg/pics/090816-historics/DSC_0076web.JPG)
Pankl Ti rods
![](http://www.jeepvideos.com/mpeg/pics/090816-historics/DSC_0087web.JPG)
Crank
![](http://www.jeepvideos.com/mpeg/pics/090816-historics/DSC_0088web.JPG)
Small end
DLC coating on cylindrical lifters
Keyed lifter bores for cylindrical lifters
ITB
Just a little duration on these cams
Gun-drilled cams
Another shot of lifters
Piston in steel liner (I think so they could run 102.7mm pistons & push displacement up to 4.0L. Previous gen 3.8L Cup motors use Nikasil?)
Heads
Del West Ti valves w/ beryllium-copper seats?
Intake plenum
2-ring pistons w/ DLC pin. 346.6 grams!
Main bearings
Pankl Ti rods
Crank
Small end
#56
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Okay, I feel stupid asking but I'm going to do it anyway.
How long have 911's had a dedicated crank throw for each rod?
Have they ever been paired like in a V motor?
How long have 911's had a dedicated crank throw for each rod?
Have they ever been paired like in a V motor?
#57
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Paired = "V"-engine; even when cylinders are in fact opposed.
For example, testarossa engine is a 180° ("flat") V-12.
More here: http://en.wikipedia.org/wiki/Flat_engine
Porsche 911 engines always were of boxer type AFAIK.