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Old 09-18-2013, 09:55 PM   #1
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Default Oil, burned oil

Ok, i've been watching the forum for a long time and this is the first serious post.
So i have a 99 1.6 miata(yeah i know im in europe and is imported from japan, rhd yes ,anyways) i've been running a tiny turbo for 2 years a GT1752 at 6 psi. No problem at all except some minor overheating on high ways due to stock rad and the hot temperature of Cyprus. In june i replaced the baby turbo with a Gtir one t28 , and changed oil from 15w40 to 10w40, even on first starts was smoking from the exhaust, white smoke.after a few miles turbo gave up, and a loooot of white smoke, rebuilded it.. the same... Got a new one installed, the same again. This happens at WOT , i put a restrictor 1.3 mm and then 1 mm didn't help. It seems that is the piston rings...it smells a lot of burned oil and the dipstick proved it too. Any opinion and advice would be appreciated. ( made a lot of miles in case you think would have oil in the exhaust from the previews turbo) ..
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Old 09-18-2013, 10:00 PM   #2
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do compression and leakdown test and get the facts, not opinions
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Old 09-18-2013, 10:02 PM   #3
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do compression and leakdown test and get the facts, not opinions
Compression is good was checked...
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Old 09-18-2013, 10:03 PM   #4
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what were the numbers for each cylinder?
also more importantly
what were the leakdown numbers for each cylinder?
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Old 09-18-2013, 10:11 PM   #5
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what were the numbers for each cylinder?
also more importantly
what were the leakdown numbers for each cylinder?
About 135-140 each cylinder. I don't remember exactly it was made 3 weeks ago.
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Old 09-19-2013, 01:09 AM   #6
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That's not good. At all lol
Unless you did it wrong or something. And it sounds like you're another one of those careless kids that wants to just throw out a vague question onto the forum and then speculate about it without any real troubleshooting.
The point of a compression test is to specifically identify variation in pressure between cylinders. So you need absolutely precise numbers for each for it to be worth a crap. Similar situation with leakdown, but a bit different.

So either do both tests correctly and get a really good indication of what the problem is, or keep wasting time on the internet with people thousands of miles away from you trying to guess what is happening.
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Old 09-19-2013, 10:30 AM   #7
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About 135-140 each cylinder. I don't remember exactly it was made 3 weeks ago.
Thats low on all cylinders but could be because you didnt hold the throttle body open or have a really long hose on your tester.
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Old 09-19-2013, 11:19 AM   #8
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Or if he lives at high altitude (5,000 + ft), those numbers would be okay.
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Old 09-19-2013, 11:20 AM   #9
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That's not good. At all lol
Unless you did it wrong or something. And it sounds like you're another one of those careless kids that wants to just throw out a vague question onto the forum and then speculate about it without any real troubleshooting.
The point of a compression test is to specifically identify variation in pressure between cylinders. So you need absolutely precise numbers for each for it to be worth a crap. Similar situation with leakdown, but a bit different.

So either do both tests correctly and get a really good indication of what the problem is, or keep wasting time on the internet with people thousands of miles away from you trying to guess what is happening.
Thanks for your answer but i aint trying to take your time i just wanted some help because as you can see the test was made 3 weeks ago and i've be trying to figure out what was the problem with the car. I didnt ask to tell me what my car has but an opinion that might help me...
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Old 09-19-2013, 11:21 AM   #10
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Thats low on all cylinders but could be because you didnt hold the throttle body open or have a really long hose on your tester.
The test was made by a mechanic and this is what he told me. I'll do it me though now.
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Old 09-19-2013, 11:35 AM   #11
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The test was made by a mechanic and this is what he told me. I'll do it me though now.
say wahhh???
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Old 09-19-2013, 11:39 AM   #12
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say wahhh???
Lol. Mobile phone typing. Ignore it!
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Old 09-19-2013, 12:34 PM   #13
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Weird. Two mentions of a GT17 turbo in two days.
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Old 09-19-2013, 12:42 PM   #14
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Weird. Two mentions of a GT17 turbo in two days.
Its not the standard Garrett naming scheme, its a saab 9-3 turbo. Seems to be able to be pushed to about 220whp.
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Old 09-20-2013, 10:19 AM   #15
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I'm going to guess cracked piston rings due to the larger turbo swap. What are you using to control fuel and spark?
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