Supertec SuperCrank

[Henry Schmidt]

It's finally here.

This is the new SuperCrank manufactured by Marine Crank for Supertec Performance. They are 66 mm stroke, 9 bolt crankshafts that fit 3.0-3.6 Porsche cases used from 1978 through 1998. They will also fit the twin turbo and GT3 cases. 66 x 95 = 2.8SS. These cranks allow Porsche engine builders to make high RPM (9200) engines that can take advantage of proper rod length to stroke ratios. The rod journal is designed to use GT3 titanium Pankls. They are avaiable in three different rod lengths, 127.8, 130 and 138mm. The cranks are made from certified E4340AQ alloy steel (chromoly). They are triple heat-treated and ion plasma surface hardened. The lightweight design incorporates a special high speed oiling system (some simple crankcase oil flow modifications required) and no crank plugs. As you can see, the crank is cross-drilled on each main journal so that every rod is lubricated directly from the main oil transfer galley. With a state of the art flyweight design, main and rod fillets made larger (RSR style) and the crank throws hollowed, the increase strength is unmatched by any previous designs. A side benefit of the hollow crank throws is lightness. The finished product is then dynamic balanced. At this time, we only have a 66mm but any stroke can be manufactured to meet all your wildest dreams. How about a 72.4 mm stroke? Alternatively, 78 mm for that matter?

[euro911sc]

Wow... I'm speechless!

Do you have any 2nds I can hand on the wall as art?

Best regards,

Michael

[930gt-40r]

I just glued my keyboard....

[jcge]

That is a work of art Henry....did I miss the price ?

[Henry Schmidt]

Originally Posted by jcge

That is a work of art Henry....did I miss the price ?

Just like gold, oil and all valuable commodities, these just keep going up. We got them yesterday and only have one left from the first batch. I'm saving it for a special project. The right customer with the right budget and the right vision.
What I want to build is a 102 mm bore by 66 mm stroke. A 9000+ rpm 3235 cc.

[Bobboloo]

That is a thing of beauty...

[Facey]

my goodness... 9000 + rpm 3.235L would be heaven... you going to turbo that? MFI?

all i need is the money henry and i'll be giving you a call (year one of PhD, so i'll be a while)...

[lucittm]

Henry,
How did they cross drill the crank with hollow rod throws? Can they bend light too? I bet it was a pain to balance...

How much does it weigh compared to a stock crankshaft of similar specs?

Thanks,
Mark

[Henry Schmidt]

Magic

The crank we used as a baseline for this design was the 935 3.0 crank. The cranks weigh 2lb less than a 935 crank. It's hard to compare dissimilar cranks but the SuperCrank uses a chrome-moly that is 30% more dense than the steel forging of the 935 factory crank and yet weighs less.

[JeremyD]

I was wondering when someone was going to do this (or similiar) leave it to Henry to push the envelope - Kudos to you! Now I just need to make more money.

[motorracer]

Hi the crank i have looks alot like it

[Henry Schmidt]

Nice looking crank. What's it for and who makes it?

[motorracer]

hi its for 3.3 turbo 75mm stroke i think cmw had it made

[dan67]

Henry gooood work the state of Art

[oliver07r]

Very very nice and very interesting Henri....

[jpahemi]

Henry:

Is the crank a forged piece? Knife edge??

Regards,
jp

[Henry Schmidt]

Originally Posted by jpahemi

Henry:

Is the crank a forged piece? Knife edge??

Regards,
jp

The cranks a billet and the fly weights are tapered. You could use the term "knife edged" but that term is misleading. Knife edge can refer to a sharpened leading edge or a taper on the entire flyweight.

[jpahemi]

Billet, that must be quite a pricey crank indeed...

[Henry Schmidt]

Originally Posted by jpahemi

Billet, that must be quite a pricey crank indeed...

In the overall scheme of things, the price is really reasonable for the highest level of craftsmanship.
Dave @Marine Crank charged us for his expertise not the status of the brand. Designed and manufactured in America not Germany.

Buying American is how we get the quality we demand.

[jpahemi]

Henry:

Are the OEM 911 cranks considered inferior to this crank? My understanding is the 911 crank is one of the better cranks produced...in the production car category.

jp