What happened here?

[Gnology]

I seem to have a cold start issue now.

 

[TurboDave]

Hard to say if the pressure spike happened after the KABOOM, or before it...

I was going to mention that time frame. Could have been a backfire that spiked the MAP like that. Probably what broke the crank. Plus, it looks lean for running alky!

 

[TurboTnZ06]

I joined the club back in April 2001, 5000 rpm, 22#'s boost, pump gas. I broke everything but the head castings and intake. Converter bent, front cover cracked, never found 2 connecting rods (they were turned into powder I think), trans housing in multiple pieces. I looked under the car and saw a cam lobe sticking sideways out of the side of the oil pan.

 

[Gnology]

Thanks for sharing.

The a/f is a little richer than stated as the fuel energy constant is still at 1.0.

Also running 16lbs boost and 23 degs timing...been running fine with no knock for quite a while.

Previous blast below...
=============================================
C-Com for Windows REL B Data Log Export File
=============================================
Exported From.......: 444
Created.............: 12/13/2011 06:35 PM
Sample Rate (fps)...: 3.4
Total Frames........: 33
Total Time (secs)...: 9.718
Number of Cylinders.: 6
Injector Flow Rate..: 83.0
RPM Cell Size.......: 400
MAP Sensor..........: 3 BAR
=============================================

================================================================================================================================================================================================================================================================================================================================================================================================================
Elapsed Time Actual A/F Target A/F TPS (%) MAP (kPa) MAP (PSIA) Air Temp(*F) Coolant(*F) Battery (V) RPM Spark(*BTDC) BPW (mS) O2 Corr. (%) VE (%) MPH Learning Inj. DC (%) ESC Rtd (*) MPG BC TGT % Boost DC % MAP AE Delta TPS Delta MAP AuxOut2(MAP)
================================================================================================================================================================================================================================================================================================================================================================================================================
0.000 12.13 12.75 51 105 0.9 83.0 175.0 12.7 2650 30.75 5.5 8.6 85.2 7 0 12.2 0.00 0.5 100 100 0.00 2 0 1
0.327 11.88 12.69 58 110 1.8 83.0 175.0 12.6 2950 30.00 5.9 6.3 86.7 11 0 14.1 0.00 0.5 74 100 0.00 0 0 1
0.624 12.50 12.63 61 119 3.2 82.0 175.0 12.7 3250 29.25 6.5 2.3 90.6 14 0 17.6 0.00 0.8 74 100 0.00 0 0 1
0.936 12.38 12.44 61 131 5.7 81.0 175.0 12.7 3650 28.00 7.7 2.3 92.2 17 0 22.4 0.00 0.8 74 100 0.00 0 0 1
1.248 12.13 12.19 61 153 10.0 81.0 175.0 12.6 4200 26.75 9.3 2.3 89.1 21 0 30.2 0.00 0.5 74 100 0.00 0 0 1
1.544 12.38 12.00 58 185 13.6 81.0 175.0 12.6 4900 25.50 10.9 3.9 88.3 26 0 42.0 0.00 0.5 74 100 0.00 0 0 1
1.856 11.75 11.88 61 205 15.0 77.0 175.0 12.5 4800 23.75 11.8 6.3 85.9 31 0 47.5 0.00 0.8 74 100 0.00 0 0 1
2.152 11.63 11.88 62 209 15.7 73.0 175.0 12.5 4700 23.50 11.9 6.3 85.2 35 0 46.7 0.00 0.8 74 100 0.00 0 0 1
2.449 11.50 11.81 64 210 16.1 70.0 175.0 12.5 4700 23.00 11.8 4.7 82.8 40 0 46.3 0.00 1.0 74 100 0.00 0 0 1
2.745 11.88 11.75 66 211 16.1 68.0 175.0 12.4 4750 22.75 11.5 2.3 82.8 45 0 47.1 0.00 1.0 74 100 0.00 0 0 1
3.042 11.63 11.75 68 211 16.3 65.0 175.0 12.5 4950 23.25 11.6 1.6 83.6 49 0 48.6 0.00 1.3 74 100 0.00 0 0 1
3.354 11.75 11.75 71 215 16.3 64.0 175.0 12.4 4950 23.25 11.8 0.8 85.2 53 0 49.4 0.00 1.3 74 100 0.00 0 0 1
3.666 11.63 11.75 71 212 16.1 62.0 175.0 12.3 5100 23.00 11.9 0.0 86.7 58 0 51.0 0.00 1.3 74 100 0.00 0 0 1
3.978 11.63 11.75 73 212 16.3 61.0 175.0 12.3 5300 23.00 11.8 -1.6 85.9 63 0 52.2 0.00 1.5 74 100 0.00 0 0 1
4.274 11.75 11.75 74 215 15.9 61.0 175.0 12.3 5250 23.25 11.9 -1.6 87.5 66 0 51.0 0.00 1.5 74 100 0.00 0 0 1
4.570 12.13 11.75 75 212 16.1 60.0 175.0 12.4 5400 23.75 12.0 0.8 85.9 69 1 53.3 0.00 1.5 74 100 0.00 0 0 1
4.867 11.00 13.13 62 204 -7.2 60.0 175.0 12.3 5350 25.75 2.6 -0.8 53.1 72 0 51.0 0.00 58.8 100 100 0.00 0 0 0
5.163 8.38 14.81 0 27 -9.3 58.0 174.0 12.4 2500 26.75 0.6 0.0 45.3 73 0 1.2 0.00 59.8 100 100 0.00 0 0 0
5.475 9.63 14.56 0 48 -7.7 57.0 174.0 12.5 1750 29.50 1.3 0.0 50.0 73 0 2.0 0.00 59.8 100 100 0.00 0 0 0

 

[Amelio]

Holy crap Shawn! that sucks man I am sorry to see that......I suppose that is why you called me last night....sorry I missed your call.

That is some serious carnage.......I have broke an engine like that but not a Buick....it was a 455 Pontiac.

I am curios to know what failed.....I would not think that much damage would arise from a 17-18 psi pull unless that 26 psi spike happed prior to the break!

It could be that something was hurt and or weak prior to that pull.....that engine has been together 10 years and lots of track pulls......

I'm sorry man thats rough I do know what it feels like.....gimme a shout when you got some time.

 

[Gnology]

Thanks man and all who have responded. It does suck, but opens up a great opportunity to build another. This one lasted over 10 years, used to drive it to Bowling Green 1000 miles, bolt slicks on and run high 10s low 11's, bolt street tires back on and drive 1000 miles home. It did well.

I swear it felt like the transmission bell housing broke, then took out the engine...transmission in all twisted and stuff. Fun.

 

[SPOOLFOOL2]

Dang!

Sorry to hear this. Hope you get it back up and running soon.

Mike Barnard

 

[Gnology]

More carnage!

Maybe the transmission shop that installed the front pump and converter 1 week before this, had a mishap with the ds align dowel upon install and cracked the housing?..?..?