car burning oil ever since new engine..~2 qts. per 1000 miles!
12-16-2004, 10:04 PM
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car burning oil ever since new engine..~2 qts. per 1000 miles! i took the ls1 block and had it honed and put the 383 assy. in it approx 7000 miles ago.. i know that any engine consumes oil the first few hundred miles..but in 7000miles the rings should definitely be seated with no oil burning.. the car only smokes when i get on it hard, or at least thats the only time i see any smoke..anyone got any ideas? i know that the 99s had a tsb on the factory rings but of course i replaced those with new ones when i replaced the rotating assembly...so anyone that has any ideas just let me know thanks.
12-16-2004, 10:24 PM
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If it smokes when you start it after it has been sitting a while its the valve seals.
I had some leaking seals on my old motor and it smoked at start up and high rpms...don't know if it was the seals or something else. I never really worried about it.
When I took the motor apart all my rings looked fine.....I am pretty sure it was the valve seals.
Could be that is smoking all the time and it just takes high rpms to burn enough to see.
I had some leaking seals on my old motor and it smoked at start up and high rpms...don't know if it was the seals or something else. I never really worried about it.
When I took the motor apart all my rings looked fine.....I am pretty sure it was the valve seals.
Could be that is smoking all the time and it just takes high rpms to burn enough to see.
12-16-2004, 10:46 PM
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not sure but that is the same thing my mechanic friend asked me...how would i find out? its a 99 ls1 so i guess whatever came stock on it..not sure though. anyway. like i said its only at high rpms and it is also burning 2qts to every 1000miles or so..i wouldnt think that it would be the valve seals if it is burning that much without me noticing it on the startup..i had a blazer with bad valve seals on it and it smoked everytime i started it up and it didnt burn hardly any oil so i am not sure but the pcv system is def. something i need to check into.. just dont know how.. thanks for the info guys. keep the opinions coming. thanks
12-17-2004, 08:57 AM
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well the stock pcv lets oil sneak into the intake but damn man not anywhere near enough to burn 2 quarts every 1k miles, i mean you gotta be running bad valve seals along with bad rings and a seriously messed up pcv system to burn that much, i got badly seated rings, and the stock leaky pcv system and i still don't burn 2 quarts per 1k miles. more like 1 per 1k or so.
12-17-2004, 09:51 AM
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Originally Posted by Reboot
I went through 1qt every 400 miles last year when I had bad valve seals. I replaced them and stopped burning oil.
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12-17-2004, 10:24 AM
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gm makes a fixed orifice pcv valve for gen 3 engines that is supposed to help on the oil consumtion, it is a resdesigned part. u can only get it at the dealer. i would also do a leakdown test on all cylinders and if the results of that are inconclusive i would start with that pcv vavle and a new set of valve seals. if the car isn't leaking anything.
12-17-2004, 10:39 AM
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Originally Posted by zamboxl
holy jesus man did all of your seals decided to self destruct all of a suden, lol wow never thought you could burn so much on bad valve seals
That was back when Patriot used those crappy teflon seals.
12-18-2004, 11:44 PM
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thanks guys..probably do a leak down test..then maybe replace valve seals...will check on the fixed orifice pcv valve.. keep any opinions you might have coming..thanks.
12-20-2004, 08:04 AM
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Anyone read the latest High Performance Chevy? Somewhere in there, there's a comment from one of the editors about an exchange that took place between him and a machinist doing an LS1 block.
The machinist had honed it with torque plates and measured the bore. All was perfect. He released the torque plate and measured again and the bore was seriously out of spec. He put the torque plate back on and all was fine.
At some point I believe someone measured a stock block without plates and it measured consistent top to bottom....which means it wouldn't with the heads torqued. Obviously it was so bad that it warranted a surpised call to the guy and a mention in the magazine (although I can't remember how far out it was).
The moral of the story? It looks like the LS1 might be more susceptible to deforming under head torque than most other engines. Based on the measurements of the engine block detailed in the magazine, there would be no way to get good ring seal on the motor without using torque plates.
I've always considered torque plates an almost must-have for a performance buildup, even on iron big-blocks. I'm going to consider honing with torque plates gospel now, at least with the LS1/LS2 blocks.
The machinist had honed it with torque plates and measured the bore. All was perfect. He released the torque plate and measured again and the bore was seriously out of spec. He put the torque plate back on and all was fine.
At some point I believe someone measured a stock block without plates and it measured consistent top to bottom....which means it wouldn't with the heads torqued. Obviously it was so bad that it warranted a surpised call to the guy and a mention in the magazine (although I can't remember how far out it was).
The moral of the story? It looks like the LS1 might be more susceptible to deforming under head torque than most other engines. Based on the measurements of the engine block detailed in the magazine, there would be no way to get good ring seal on the motor without using torque plates.
I've always considered torque plates an almost must-have for a performance buildup, even on iron big-blocks. I'm going to consider honing with torque plates gospel now, at least with the LS1/LS2 blocks.
Especially with an Aluminum block!
12-20-2004, 03:10 PM
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All engines, and yes, that means all, should be honed with torque plates and main caps on. Once bolted on it will distort the LS1 block and it will give you a diffrent reading. So when you bolt on the heads and cap it will not properly seal. As far as the CHP article goes, I read that too, but c'mon most of you guys knew this before this came out, right?
12-20-2004, 03:53 PM
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Originally Posted by moyam01
As far as the CHP article goes, I read that too, but c'mon most of you guys knew this before this came out, right?
Brad
12-20-2004, 04:04 PM
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i had no idea...and obviously the machine shop didnt either..i guess ill just keep pouring oil into the bad boy...? i really cant afford to pull it back out and have things redone..should i just keep putting oil in it or will it keep getting worse?
