You might be experiencing Detonation if...................

[turbodave231]

Customer's engine. I knew it was bad news when the flywheel turned and the balancer didn't!

 

[longball]

Wow! That's pretty severe damage.....don't think you're going to be able to buff that out......

 

[TurboBuRick]

Stock cranks are time bombs.

 

[BEATAV8]

Cool Pics

Wow never seen fretting on main cap 1

 

[jhanson1750]

Looks like #5 has self clearanced for a stroker setup..... wow that is a bad day.
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[turbodave231]

These main caps are by far the worst fretted caps I've ever seen on a BV6. It had two billet main caps which were loose and sloppy in the register.

 

[psycho6cyl]

What kind of power was he pushing? I feel for him

 

[notacarlo]

Welcome him to the DOTC club for us.

 

[lrayzer]

The value of a good used block just went up.....
From now on I bet the earbone ( hearing detonation), connected to the rightfoot-bone ( causing detonation) will be more closely linked the the wallet-bone ( paying for detonation)

 

[Pronto]

That's nasty! Is there a know cause for this other than operator error?

 

[TTipe]

These main caps are by far the worst fretted caps I've ever seen on a BV6. It had two billet main caps which were loose and sloppy in the register.

Dave I just wonder if the steel caps were used second hand? If so they may not achieve the required interference fit in the registers.

 

[turbodave231]

Wayne, the caps fit properly at one time..... The detonation caused the registers to open up as the caps danced around!!

I'll bet that the block is cracked thru the mains. But I won't spend the time to magnaflux inspect.....the block is toast.

Engine was burning E-85. I am guessing the problem(s) were caused by a poor tune, unpredictable fuel quality and a heavy right foot.

Stock crank, rods and cast pistons didn't help the situation. Forged parts would not survive this beating either. But they wouldn't end up in the pan in little pieces.

 

[jdpolzin]

Yowsa!! Need to teach that boy how to tune!

 

[turbo nasty]

BOOM....I was expecting to see crack out form the mains threaded holes..Its cracked somewheres I bet.

 

[87chrisss]

Interesting you mention unpredictable fuel quality, i personally have tested 100's of batches from my local pumps. Never had one bad batch? Alway's seem 85% or a bit more on the tester. There isnt fuel left in the tank? Test it.

 

[dr_frankenstein]

agh its fine, hose it up with some WD-40 slap on some JB weld and lets go racing!

 

[turbodave231]

I like E-85, but from my experience, it can vary greatly in alcohol content. I've tested e-85 from a few of the local pumps and I've seen 60% to over 85% alcohol. In my area of the country, I know it varies! It might be multiple suppliers or some other factor I'm not aware. Other areas, like FL........I can't comment.

I would be very concerned about the percent of alcohol content if I were using E-85 as a race fuel or ran the engine on the edge of detonation (real aggressive tune). I would probably buy VP or Sunnoco E-85 if I were going to use it as a race fuel. It would be more expensive than pump fuel, but the quality would be predictable.

For use as a street fuel, E-85 is probably a great option. Again, I wouldn't be running the tune on the edge in a street application either

An old top fuel racer once told me:"Race fuel is the cheapest thing you will put in your race engine" That advice rang true and has always stuck in my mind.

 

[tbone87]

How much boost was on it?

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[750H.P.V6]

Dave,

That's a pretty sad case, looks like you'll be starting from scratch on the short block. Proof positive that anyone can turn up the boost but not everyone knows how to tune.

Neal

 

[lrayzer]

That was a failure to lift, when the engine was giving bad mojo feedback, I have heard some people just cannot feel or recognize/hear detonation.
I ran a 12.5 SBC on the street for years along with numerous other old school combo's yeah, I can feel it.
Still hate it for the owner, makes for a shitty day.