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THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCH996 3.4 blown engine
Leading reported evidence
Run 25k miles
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
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0
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1
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Read evidence and context
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Performed · outcome unconfirmed
PS: The late Carlitos's 3.4 ran for 25k miles with a blower and is still racing today (without the blower) with 110k mles on the original, untouched motor.
Leading evidence: 'Run 25k miles' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check may have shown more' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Performed · outcome unconfirmed · Original poster
After doing the work, I made the mistake of starting the car before I lowered the car to make sure everything ran right.
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Suggestion · Original poster
I was changing the coil packs and plugs on the passenger side.
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Performed · outcome unconfirmed
PS: The late Carlitos's 3.4 ran for 25k miles with a blower and is still racing today (without the blower) with 110k mles on the original, untouched motor.
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Recent problem I need some guidance on.
I was changing the coil packs and plugs on the passenger side. I jacked up the car from right rear, pretty high. After doing the work, I made the mistake of starting the car before I lowered the car to make sure everything ran right. So, car was tilted heavily to the driver's side. Because of the car's tilt, I guess the 6cyl was starved of oil (being the highest elevated cylinder) and the engine basically grenaded. Towed the car to my shop and 6 piston is no longer connected to the crank.
Is it really possible in this scenario that the engine really blew up of the cylinder being oil starved?
Man thats awful. Sorry to hear. Must have really been on its side to starve for oil. I have run mine many times on jack stands with no problems. You may want to contact Jake at Flat6 and ask.
You seriously started your car, with one side up on jack stands? Not smart in the least, but while it may have been a factor, it would not normally grenade an engine. it culd only be up so high, or you couldn't have gotten in the car to start it. But yes, if it was oil starved (for whatever reason), that could easily happen.
I don't see how the piston & or rod is no longer connected to the crank. Spun rod bearings enough to lockup the crank maybe. How long did the engine run in this postion??
Surely pics and details will follow. Either way its a CEF and very bad for the OP. I truly am sorry but see if the engine can be saved before you give up.
Sucks this happened to you. I doubt that it was slanted made much difference. That would imply that every time you would start your car on an incline there is a risk of engine blowing up?! From what i can see your car was supercharged at one point and you track it pretty hard, that might have done some damage.
Sometimes just starting it can cause this.
How many times does this need to be posted? Hope he does so.
Impossible, remember the thread where we were assured SC'ing an M96 caused no problems or risks?
I find this HIGHLY unlikely... if that was the case then why wouldn't your engine grenade when on a race track? For example, Daytona's steepest angle is about 31 degrees... that's pretty steep! While starting a car on jacks is not a safe way of doing maintnenance, I doubt if it caused your issues. Sorry for the bad luck...
Tom
If the oil pickup was not picking up oil then a bad chain of events could be triggered .One result could be heat and ultimately a failed rod bolt .Not knowing the angle of the car and where the oil pickup was in relation to the oil pool it's only speculation without facts .
Sorry for your misfortune.................
fpb, you really think that could happen? I suppose if it were a steep enough angle, huge clearances, long enough time, maybe. I know water will do it quickly but oil????? Im being serious.
Not funny, oh well, maybe a little funny.
Thanks for the feedback.
Some answers:
- Road Atlanta and Roebling do not have any camber like Daytona and others.
- Ironically I did a few Auto-x with the VF supercharger, but ripped it off and did a big project taking the car back to stock with just intake, full fabspeed exhaust and tune.
- According to my indy the 6 cylinder's piston is not connected to the crank anymore. Crazy issue they had not seen before. being disconnected, it was burning fuel in the cylinder and caused other issues. Crazy and unfortunate.
I've snapped rods in half before so that's not unheard of. The motor sounds rebuildable so don't run it anymore. Cases are expensive these days....
PS: The late Carlitos's 3.4 ran for 25k miles with a blower and is still racing today (without the blower) with 110k mles on the original, untouched motor. The trans just recently broke a shift fork but the internals all looked good. He rebuilt it of course....
Plenty of people own these cars and live/park on the steep streets of San Francisco. Even parking at odd angles. Seems difficult to believe that that was the cause.
[QUOTE=KrazyK;10275757]fpb, you really think that could happen? I suppose if it were a steep enough angle, huge clearances, long enough time, maybe. I know water will do it quickly but oil????? Im being serious.
I had a Harley throw me on the ground and jump on me once. After it broke my leg it slid up an embankment so that the engine was heads down and the oil flowed/got sucked up under one piston, it blew the cylinder base flange off when it tried to compress the oil under the piston, cracked the case too.
That engine was dry sump. We figured the scavenge pump was out of the oil in the bottom of the case at the pickup so it just pumped all of the oil out of the tank and POOMP goes the engine. (that is kinda what it sounded like) Only took ~20 seconds. That oil was hot though.
You would think that with the opposing pistons there would be enough room to "slosh" the oil back and forth? I don't know how or what any oil would get compressed against under the piston in these engines.
I know that in the early 3ltr air-cooled engines the oil could get trapped in the cases and foam and overheat. Porsche redesigned the screen around the pickup to address that.
Pic of the car at an angle? I've had vehicles at much steeper angles under operation than on jack stands and
never
had starvation issues. I'm willing to bet there is another reason for the failure.
Hence the "seems odd" comment. Maybe it was a combo of the SC, bad AOS, engine on side? This thread has convunced me not to lift my car to work on it. I will be using a low profile creeper.
To the OP; could you take some photos of the engine while you disassemble?
Asked shop about CEL error and suggested coil pack and plug change to see if it fixed. swiched dist cables between 5&6 to see if error code moved to cyl 5. Only jacked up one side to do work.
I'm summing it up to bad day. Problem was in the works. Compression check may have shown more. live and learn. May get compression tool for future use.
It matters because the story and the pictures don't add up. 20 years ago, when I was learning how to work on cars, made the same mistake but it only resulted in a spum connecting rod bearing. I was driving that car when the oil filter and the bypass tube got plugged. Thing don't add up here, would be nice to know the real story.
We had a meet and greet with Jake and Charles (And Tony Callas of Excellence) last night and one of the points passed on to us is that idling is the WORST state for an M96 because of low oil pressure @ idle. If there was a preexisting condition - the lower oil pressure wasn't helpful...
