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| RX-7 2nd Gen Specific (1986-92) RX-7 1986-92 Discussion including performance modifications and technical support sections. |
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| RX-7 2nd Gen Specific (1986-92) RX-7 1986-92 Discussion including performance modifications and technical support sections. |
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Thread Tools | Display Modes |
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11-20-2012, 03:22 AM
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RCC Contributor
Join Date: Feb 2008
Location: Grand Rapids, Michigan
Posts: 530
Rep Power: 18  |
Increased smoke on deceleration is a classic symptom of blown oil control rings. I'm not very knowledgeable in regards to turbos though, so there may be something related to that whole system.
If it is the oil control rings, you can get very good results with Lucas Heavy Duty Oil Stabilizer. My old 12a was leaving a smoke screen, which was 95% alleviated by running a quart of the Lucas in the oil. Put about 30k miles on that motor until it coughed up an apex seal at 213,000 miles. I still use Lucas in my current motor just as a preventive measure... .
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"Learn from the past, or it will become your future...." '85 GS 12a + LSD/Sterling carb/Respeed coilovers/Respeed front swaybar/Respeed adj. rear spring perches/Illuminas/Bilsteins on rear AutoX vids @ http://www.youtube.com/user/Kentetsu1 |
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11-21-2012, 11:55 AM
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Lifetime Rotorhead
Join Date: Apr 2010
Location: Elkton, MD
Posts: 874
Rep Power: 16 |
Well here's a picture of the plugs. No evidence of wet oil anywhere when I pulled them. Probably hard to tell in these pictures, but color of deposits is a black to brownish and have a sooty texture to them - running my finger over them it feels like 1000 grit sandpaper, and some of the carbon residue transfers easily to my fingers. What do you guys think? Probably should pull the DP to take a peek at the turbo turbine wheel next.
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11-21-2012, 02:15 PM
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#3 | |
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RCC Addict
Join Date: Mar 2008
Location: Honolulu, Hawaii USA
Posts: 1,813
Rep Power: 19 |
Spark plugs looks pretty good...
Blame is starting to shift toward the turbo turbine section. Just to eliminate the easy stuff... Stock turbo drain assembly? If it's been replaced, what size fittings and hose? Relocated drain point back into sump? PCV system still intact? -Ted
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reted_2000@yahoo.com Technical Advisor FC3S Pro http://fc3spro.com/ Quote:
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11-21-2012, 04:12 PM
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#4 | |
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Lifetime Rotorhead
Join Date: Apr 2010
Location: Elkton, MD
Posts: 874
Rep Power: 16 |
Quote:
PCV is fully intact and verified to work per FSM procedure. I did have to modify the stock turbo drain to solve an interference problem with my RA OMP adapter. It uses -10 hose & fittings, retains the stock return point on the front cover and is routed almost the same as stock. Compared to stock, it takes a bit of an arc away from the block, but the plumbing has a downward slope the whole way back to the front cover. This thread has a photo of it, see post #6 http://www.rotarycarclub.com/rotary_...ad.php?t=14945 |
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