atb

Agreed. Not trying escalate anything beyond the discussion that's going on, poor choice of words on my part.

GregBBRD

Great. I really enjoy the "new" Rennlist. The ability to discuss ideas and talk about experiences calmly and without attacking someone is much better than what I have observed, in the past. (The thread about Greg Grey's parts is the exception to this...I think people have gone way too far on this thread!)

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.

Tom. M

I don't know how you guys can discount the use of Amsoil gear lube in the transmissions...that has to be what is saving them No?.

ptuomov

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?

Fastest928

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.

atb

Yeah, for a NEW thread.

GregBBRD

Great! I'm just the lucky one to get the only 2 crappy ones. I can live with that....but don't expect me to ever try to build an engine out of a 3rd one...just don't have the time to play that game. I've probably talked to a few dozen people that want me to built them an engine from one of those cranks, but I always decline. If I build it and it turns to crap, because of a "soft" crank, I'm the one that gets blamed....that's the game I don't want to play.

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.....

Fastest928

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!

Dennis K

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


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

heinrich

That crank and those pistons are too gorgeous! Whose heavily-decorated arm lol!!

atb

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?

9x8

Dedicated crank throw = "opposite" (or "boxer") engine.
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.

IcemanG17

WOW great pics......that is one sweet engine.......serious stacks of $$$$$$ went into that engine too

svp928

Keyed lifters with a curved upper surface- thats how to get an "effectively" larger base-circle for more aggressive cam profile.. COOL, man!

Thanks Dennis!

danglerb

My understanding is that DLC, Diamond Like Coating, is in reference to the cost.