My recent BMW V12 engine transplant... [Cobra replica with V12 twin-turbo] - BMW M5 Forum and M6 Forums
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post #1 of 29 Old 8th December 2009, 10:59 PM Thread Starter
dukegrad98
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My recent BMW V12 engine transplant... [Cobra replica with V12 twin-turbo]

Greetings... I haven't visited the board in a couple years now -- I used to own an '03 E39 M5, which I have long since sold. I also own a replica of the Ford / Shelby Cobra, which killed an engine through oil starvation a year or so ago. It got me thinking back to this old post (where, incidentally, someone I've never heard of made some silly comments about kit assembly...):
https://www.m5board.com/vbulletin/e39...obra-pics.html

My favorite part of my old M5 -- naturally -- was the engine. So I bought another of BMW's well-known engines and set to work cramming it into a Cobra replica like our forum friend M5Cobra did. There was no M7 or M8, though, so I had to improvise and fabricate a bit...

The result is a twin-turbo V12 Cobra replica making 495hp and 580lb-ft of torque at the wheels. Assuming 15% drivetrain loss, that means I am seeing about 576hp and 683lb-ft at the crank. Boost is currently limited to under 11psi (intercooled). The M70 block and rotating assembly can supposedly take 15-16psi, but the 10mm torque-to-yield head bolts are the weak/limiting factor. Given that I can currently spin 315/35/17 drag radials in the first three gears, I'm not really searching for any more power at the moment. I am running this through a new-old-stock Getrag BMW 850CSi 6-speed gearbox and a 2.73:1 rear-end.

I realize this is off-topic, but this is the most logical place to share, and I figured a few of you would enjoy seeing a random application of a good BMW engine. Read more and see pics here:
Unveiled: Top Secret UBERCOBRA- New Vids pg 4 - FFCobra.com - Factory Five Racing Discussion Forum

Thanks for looking. Motor on.
Cheers, John
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post #2 of 29 Old 8th December 2009, 11:04 PM
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post #3 of 29 Old 8th December 2009, 11:27 PM
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post #4 of 29 Old 8th December 2009, 11:35 PM
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Wow. Congratulations on all the hard work finally paying off! Enjoy!

2002 Carbon Black BMW ///M5 (Black Extended Leather, Anthracite Alcantara, Titanium Trim, M-Audio with Enhanced Bass, PDC)
Conforti Shark Injected with M5Board Tune, CMS Custom Muffler Delete with OE Tips, AFE Pro Dry S air Filters, ACS rep CF Front Splitters, Flat Black Kidneys, Open brake ducts with Flat Black Brake Duct Rings, StopTech Sport Cross Drilled Rotors with Pagid Pads, F10 Inspired Painted Calipers, StopTech Stainless Steel Braided Lines, Shorty Clutch Stop, Lighted ZHP Knob, Euro lenses, Evo-X bi-xenon projectors, Custom Pure White Angel Eyes (Predator Ice housing and Rebel Tri-Star LED's driven by PowerPucks), LED Interior and License Plate Lights, Fogs color matched to HID's, Oil Pan Pad Heater for winter, Stant 82C T-Stat, 3M Clear bra on hood, Flat Black Style 65's on Potenza RE-11's, Style 66's on Conti Extreme WinterContact's for the other 6 months, Interstate MTP-H9 Battery, Boomerang Espion Alert LoJack, MKIV Nav with 2014 maps.

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post #5 of 29 Old 9th December 2009, 12:10 AM
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post #6 of 29 Old 9th December 2009, 12:17 AM
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Garage
That's putting a Duke education to use! Congrats!

"The E60 is the fastest, but the one I'd want to drive home would be the E39" -Evo Magazine (March '10)
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post #7 of 29 Old 9th December 2009, 12:30 AM
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Nice work! I'm a DukeGrad also.('92)

03 M5 Titanium Silver/Black Luxury/Burl Walnut
ESS VT 550 S/C 88mm pulley, Supersprint headers and Race cats, Eisenmann Sport Exhaust, Nick G / CES Motorsport tune,
Aquamist HFS-3 water methanol injection, Rogue SSK w/ RP Synchromax fluid, fog light delete,
H&R Springs, Dinan 17mm rear sway bar, TCD sway bar brackets, Ultimate Pedals, Euro Armrest,
Hardwired V1, Angel iBrights v.2, 6000K Low beams, 70W High beams,BSW Speaker Upgrade & 10" Sub

04 M3 Jet Black/Black Nappa/6 spd
Max PSI Turbo, Aquamist HFS-3 water methanol injection
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post #8 of 29 Old 9th December 2009, 12:35 AM
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Wow, thats amazing, great work. I can't wait to design and complete a project of this magnitude someday!

2001 ///M5 - SOLD
Eisenmann Sport | Supersprint headers | SuperSprint X-pipe | Ground Control | Stoptech ST-40 front brakes | Powerchip | Rogue 280mm clutch | JB Racing lightweight flywheel | Rogue short shift | Dinan rear Swaybar | OEM 9.5" all around with Star Specs | Cosmo Racing CAI | Opened brake ducts
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post #9 of 29 Old 9th December 2009, 01:05 AM
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post #10 of 29 Old 9th December 2009, 02:01 AM
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Sweet car and awesome project. Too bad you're a Duke fan
In all seriousness, that is an amazing project!

2008 Space Gray/Black Full Merino Leather/Alum. trim
Loaded - every option (minus heated steering wheel)
Interior:Hardwired Valentine One with Concealed Display, Blinder Xtreme M25 (J16) Laser Jammer, Bimmian Interior Xenon Lighting Kit and ///M Racing Pedals
Exterior: Hartge Front Spoiler Lip, Hartge Rear Diffuser, Vorsteiner Vented and Domed Hood (Double-Sided CF), Hamann Roof Spoiler, H&R Springs and 15% Tint
"Performance": RPI GT Section 3 Muffler, RPI GT Section I, ASR CAI, Evosport Power Pulley and Hybrid Rear Badge

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