LTx blown motor horror story threads
#1
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LTx blown motor horror story threads
Hey guys,
So ive been waiting, planning, making sure I wasnt breaking the rules on LS1tech if I created a blown (LTX) motor thread with which gives members the free will to post their past & present state of blown LT motors. As for what would be interesting if members can post there story of their incidents, their diagnoses of the blown motors (which would include anything from valve-train failure, spun bearings, detonation, throwing rods, stupid misassembles, wrong geometry), and there conclusions of fixing (which more often than not would be LSx swaps ) They took the easy way out.
All forms of racing about their incidences would be fun to hear. 2 buddies of mine blew their motors this past week, 1 was a Lashway built Z06 with a 454 LS6 block, Livernoise top end (200 shot on pump gas) that spun #3 rod bearing a rear main bearing. 2nd one was a bone stock LS1 that dropped a valve.
You’ll learn just as much about a motor blow than you will with building your own motor..
Anyways
So ive been waiting, planning, making sure I wasnt breaking the rules on LS1tech if I created a blown (LTX) motor thread with which gives members the free will to post their past & present state of blown LT motors. As for what would be interesting if members can post there story of their incidents, their diagnoses of the blown motors (which would include anything from valve-train failure, spun bearings, detonation, throwing rods, stupid misassembles, wrong geometry), and there conclusions of fixing (which more often than not would be LSx swaps ) They took the easy way out.
All forms of racing about their incidences would be fun to hear. 2 buddies of mine blew their motors this past week, 1 was a Lashway built Z06 with a 454 LS6 block, Livernoise top end (200 shot on pump gas) that spun #3 rod bearing a rear main bearing. 2nd one was a bone stock LS1 that dropped a valve.
You’ll learn just as much about a motor blow than you will with building your own motor..
Anyways
#2
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Two instances. A cam bearing seized onto the cam journal as well as blowing a head gasket on the same setup within about 20 minutes after I got the car running. The other is I found out my valve geometry was wrong, went to check valve guides and found several that had more than .100" of play. All done by my own dumbassery. Lessons learned.
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Two instances. A cam bearing seized onto the cam journal as well as blowing a head gasket on the same setup within about 20 minutes after I got the car running. The other is I found out my valve geometry was wrong, went to check valve guides and found several that had more than .100" of play. All done by my own dumbassery. Lessons learned.
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May be the dumbest question but wouldnt hurt to ask, if anyone & if it is a possibility to blow a motor by a bad Opti? Assuming Opti’s can show any kind of ignition problem there is Pre-ignite, intake back-fire, wrong timing cause by the rotor, ect. Luckily mine I’ve havent ran into very many problems.
#14
My LTX blown-up story:
The head of the exhaust valve on the #2 cylinder broke off (NOT on a high speed run, steady state 55 mph) - it bounces off the piston a few times, shatters the piston into a million tiny pieces, radically bends the connecting rod, and then the wrist pins rips two places into the cylinder bore and hits coolant!
Less than fun!
But, as a happy post-script, my 355 is now a 383!
: )
The head of the exhaust valve on the #2 cylinder broke off (NOT on a high speed run, steady state 55 mph) - it bounces off the piston a few times, shatters the piston into a million tiny pieces, radically bends the connecting rod, and then the wrist pins rips two places into the cylinder bore and hits coolant!
Less than fun!
But, as a happy post-script, my 355 is now a 383!
: )
#15
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Oh I've got some good pics for this one
Shoppe (rolling blunderz) sets the shaft rockers after around 1500km break in and left the intake valve adjustment loose. When I got home heard loud ticking in the driveway and shut it down. Pulled the valve cover and found the adjustment but sitting near the drain back and a bit of smacking visible on the valve tip. Shoppe emails back saying "no need to replace retainers these are high performance parts they are built for abuse". Few days later dropped a valve at wot in 3rd.. I'm sure you guys can guess which of the 16 it was Retainer split. Carnage pics to come...
Shoppe (rolling blunderz) sets the shaft rockers after around 1500km break in and left the intake valve adjustment loose. When I got home heard loud ticking in the driveway and shut it down. Pulled the valve cover and found the adjustment but sitting near the drain back and a bit of smacking visible on the valve tip. Shoppe emails back saying "no need to replace retainers these are high performance parts they are built for abuse". Few days later dropped a valve at wot in 3rd.. I'm sure you guys can guess which of the 16 it was Retainer split. Carnage pics to come...
#16
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When I got my 95 it had been sitting outside with no intake for 4 years. When I got it home we drained 11qts of water out of the pan before ever seeing any oil.
For the hell of it we threw the intake back on and attempted to get it to run. The motor was stuck at first because water had been sitting in the #8 cylinder but when it finally broke loose she fired right up. It was making the most horrible noises I've ever heard but had 40psi of oil pressure. Shut it off and checked the rockers everything was fine so I figured it was a rod(s). Pulled the motor and it turned out to be the crank smacking the windage tray. Over time water sitting in the pan had froze and expanded bending the tray up into the crank. Believe it or not the crank was still smooth and within spec
For the hell of it we threw the intake back on and attempted to get it to run. The motor was stuck at first because water had been sitting in the #8 cylinder but when it finally broke loose she fired right up. It was making the most horrible noises I've ever heard but had 40psi of oil pressure. Shut it off and checked the rockers everything was fine so I figured it was a rod(s). Pulled the motor and it turned out to be the crank smacking the windage tray. Over time water sitting in the pan had froze and expanded bending the tray up into the crank. Believe it or not the crank was still smooth and within spec
#17
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When I got my 95 it had been sitting outside with no intake for 4 years. When I got it home we drained 11qts of water out of the pan before ever seeing any oil.
For the hell of it we threw the intake back on and attempted to get it to run. The motor was stuck at first because water had been sitting in the #8 cylinder but when it finally broke loose she fired right up. It was making the most horrible noises I've ever heard but had 40psi of oil pressure. Shut it off and checked the rockers everything was fine so I figured it was a rod(s). Pulled the motor and it turned out to be the crank smacking the windage tray. Over time water sitting in the pan had froze and expanded bending the tray up into the crank. Believe it or not the crank was still smooth and within spec
For the hell of it we threw the intake back on and attempted to get it to run. The motor was stuck at first because water had been sitting in the #8 cylinder but when it finally broke loose she fired right up. It was making the most horrible noises I've ever heard but had 40psi of oil pressure. Shut it off and checked the rockers everything was fine so I figured it was a rod(s). Pulled the motor and it turned out to be the crank smacking the windage tray. Over time water sitting in the pan had froze and expanded bending the tray up into the crank. Believe it or not the crank was still smooth and within spec
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Stock 350 LT1 with 72K miles threw a rod that hit the Cam seizing it and causing the Cam dowel pin to snap off, 1 cracked piston due to P2V contact, 5 pistons sustained hits bending the valves/pushrods.
Car just received LTs, new Opti and Tune by Tick Performance was loaded on a trailer and delivered to my wife in Florida. Threw Rod in 3rd gear not far down the road on the first drive... Still upset about it all.
Car just received LTs, new Opti and Tune by Tick Performance was loaded on a trailer and delivered to my wife in Florida. Threw Rod in 3rd gear not far down the road on the first drive... Still upset about it all.