So we tore down my Virginia Speed LS2 366" turbo motor today
10-03-2009, 10:09 PM
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So we tore down my Virginia Speed LS2 366" turbo motor today after the coolant and oil mixing failure a few weeks ago, I finally took the bullet back to shawn for failure analysis.
liners #3 and #5 cracked bad. combustion was leaking thru the liners and blowtorching the block. It was pretty violent
Funny thing was it took time to cause the damage we saw...the 7.99 was on a definately hurt motor 
cyl #3
cyl #5
torched deck
head gaskets were intact.
Slight leakage around the middle 4 cylinders...30+ psi is just too much cyl pressure for regular ARP std size head studs
on to the bottom end....
rod bearings were all PERFECT.
pulled the main caps...factory powdered metal caps held just fine at the ~1700-1800hp level. pinned mains did their job...no cap walk
thrust looks almost new after 40 passes....ATI has their sh%t together when it comes to keeping the converter from pushing on the crank
very minimal crank flex...completely normal for a traditional-counterweighted lightweight crank. It had some light wear on the center main bearings.
bottom line...the moroso pan and melling oil pump work well and showed no evidence of oil starvation...motor was ~8100 rpm at times...
obviously the block is trashed, so we'll be replacing with a used LS2 "****" block I found...plan is to resleeve with heavy-wall liners up the bore size to ~4.125...
liners #3 and #5 cracked bad. combustion was leaking thru the liners and blowtorching the block. It was pretty violent
Funny thing was it took time to cause the damage we saw...the 7.99 was on a definately hurt motor cyl #3
cyl #5
torched deck
head gaskets were intact.
Slight leakage around the middle 4 cylinders...30+ psi is just too much cyl pressure for regular ARP std size head studs
on to the bottom end....
rod bearings were all PERFECT.
pulled the main caps...factory powdered metal caps held just fine at the ~1700-1800hp level. pinned mains did their job...no cap walk
thrust looks almost new after 40 passes....ATI has their sh%t together when it comes to keeping the converter from pushing on the crank
very minimal crank flex...completely normal for a traditional-counterweighted lightweight crank. It had some light wear on the center main bearings.
bottom line...the moroso pan and melling oil pump work well and showed no evidence of oil starvation...motor was ~8100 rpm at times...
obviously the block is trashed, so we'll be replacing with a used LS2 "****" block I found...plan is to resleeve with heavy-wall liners up the bore size to ~4.125...
Last edited by Fireball; 10-05-2009 at 06:36 AM.
10-04-2009, 07:12 AM
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I didnt see much good news in this? The only good news I seen was motor going back together with more cubes. To make the car competive in the class. No matter what its still money lost. Fireball you keep given her hell...
10-04-2009, 08:16 AM
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There's definiate good news there. The oiling system is up to par. The main caps with the pins added are doing their job, the crank isn't showing any signs of flexing. The head gaskets with the double oring are holding fine for probably a 1600 hp build.
That's all good news to me, the factory liner, the one that was designed to hold a 400 hp factory motor, well I guess they can't take OVER FOUR TIMES THE POWER THEY WERE BUILT FOR. That I'm not surprised to hear, sucks that they failed, but what are you going to do.
Alot of good useful info there, at least for me
That's all good news to me, the factory liner, the one that was designed to hold a 400 hp factory motor, well I guess they can't take OVER FOUR TIMES THE POWER THEY WERE BUILT FOR. That I'm not surprised to hear, sucks that they failed, but what are you going to do.
Alot of good useful info there, at least for me
10-04-2009, 10:38 AM
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exactly...what we expected to fail...failed...we didn't do anything to strengthen the liners...so one would expect that to be the mode of failure...the fact that everything else was working well it what was amazing!
Last edited by Fireball; 10-05-2009 at 05:57 AM.
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10-05-2009, 09:17 AM
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This only makes yout 7.99 all the more impressive!
Things will wear out when you are pushing that mush power, especialy the engine. Not bad for the amout of power you were puting down through factory components!
Good luck with the new build!
Things will wear out when you are pushing that mush power, especialy the engine. Not bad for the amout of power you were puting down through factory components!
Good luck with the new build!
10-05-2009, 11:24 AM
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There is nothing wrong w/ that. It is nice to see the results either way and depending on the person, not everyone wants to talk when they broke the car. Run that 7.99 is damn impressive considering the conditions.
I do like the idea of 6 bolt provisions but I wonder if the pistons can handle the extra clamping force, that would be a good question to consider for the next season.
I do like the idea of 6 bolt provisions but I wonder if the pistons can handle the extra clamping force, that would be a good question to consider for the next season.
