550+rwhp too much for built engine

P

Ponyfreak

Registered
I think this is the first time I have seen a cast crank break. None-the-less it is why you use a steel crank if you plan on making some power.

I was in the car with John driving and it all came apart in 1st gear at 7000rpm. I thought it was a rod but noticed it never windowed the block, which is really unusual. Below are the suprising pictures that we took this week. This car was a solid 10 second car.

This is why the supercharger off of this car is up for sale.

http://mark8.org/users/ponyfreak/web/John car/engine/DSC06032.JPG
http://mark8.org/users/ponyfreak/web/John car/engine/DSC06034.JPG
http://mark8.org/users/ponyfreak/web/John car/engine/DSC06040.JPG
http://mark8.org/users/ponyfreak/web/John car/engine/DSC06042.JPG
http://mark8.org/users/ponyfreak/web/John car/engine/DSC06044.JPG
http://mark8.org/users/ponyfreak/web/John car/engine/DSC06045.JPG
http://mark8.org/users/ponyfreak/web/John car/engine/DSC06046.JPG
http://mark8.org/users/ponyfreak/web/John car/engine/DSC06050.JPG
 
Eesh, and I thought my car had problems!

What does the rest of the bottom end consist of? All stock stuff still?
 
Was this an old crank re-used for the build ?

Do you think 7k might have more to do with this damage than the RWHP level ?
 
Well you have popped more engines than anyone I know... Don't you think it is time for a "safe tune"?
 
I beam rods with ARP 2000 bolts, Diamond pistons, all ARP fasteners. This had nothing to do with a tune. It was the power that broke this crank combined with 7000 rpm's. If you aren't breaking stuff you are not going fast enough.
 
Joe:
Sorry to see all the broken parts, but adleast you brokem in big chunks. There's nothin wimpy about you guys. Hope you can make the meet at Detroit this August. Say Howdy to John for me!
 
550rwhp in a Mark VIII and plus that big T-Trim you can safely bet that motor was making well above 700 at the crank (spinning the blower, IRS, auto tranny etc).
 
Here are a couple more pictures. The block really broke in half.


DSC06065.JPG

DSC06053.JPG


DSC06054.JPG


DSC06055.JPG


DSC06057.JPG


DSC06059.JPG


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DSC06062.JPG
 
Nice one Joe. I can't say I have ever seen one that bad until now.
Did you break it at the track?
 
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