My recent BMW V12 engine transplant... [Cobra replica with V12 twin-turbo] - BMW M5 Forum and M6 Forums General Sportscars See the DVD. This form also contains a BMW X6 and X5 Forum.

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post #1 of 29 Old 8th December 2009, 10:59 PM Thread Starter
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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...):

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 - - 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!

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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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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)

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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!

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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!

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