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Crew Chief
Join Date: Nov 2001
Location: Wilkesboro, NC
Posts: 1,678
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Smoking on Decellaration
I have a Problem with an 86 951 that is smoking when you let of the gas at higher RPMs (4500 and up).
I checked the Intercooler Pipes and they had a mixture of Oil and Water in them , so i replaced the Turbo (bad internal seals). Everything is dry now but it still smokes when you let of the Gas at high RPMs. It does fine if you keep the RPM lower. Is there an easy way to check if the Valveguides are worn ? The car has about 127000 miles on it and runs fine . Any other ideas ?
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Herbert B. GruppeB #093 Carolinas Region PCA Member National PCA Driving Instructor _______________ '71 911 RSR look '74 914 2.0 '76 911S Targa '83 930S Slantnose (13000 miles) '86 951 Prototype Testcar built in '84 (56000 miles) Serial #00014 '86 951 '87 944 "Life is short , drive Fast" |
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05-09-2005, 09:55 AM
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Registered
Join Date: Jul 2001
Location: Edmonton, Alberta, Canada
Posts: 4,530
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Definitely sounds like valve stem seals........ SUcking in the oil.
You can do leak down to diagnose.
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Alex - PCA Polar Region - Boxster Muncher 86' 944 Turbo - Megasquirt - 326 rwhp/340lbft @ 18 psi SOLD www.edmontonhomelife.com www.edmontonrealestate.ws |
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05-09-2005, 09:59 AM
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Registered
Join Date: Nov 2003
Location: Charlotte NC
Posts: 1,197
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how much oil in the airbox? Id do a compresion/leakdown asap.
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Current: 1973 914/4 project. FOR SALE |
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05-09-2005, 02:30 PM
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Crew Chief
Join Date: Nov 2001
Location: Wilkesboro, NC
Posts: 1,678
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No oil in the Airbox , i guess leakdown check is next .
Just trying to get it fixed to go to the PCA DE in Kershaw ( Carolina Motorsports Park ) in 2 weeks. Any other ideas?
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Herbert B. GruppeB #093 Carolinas Region PCA Member National PCA Driving Instructor _______________ '71 911 RSR look '74 914 2.0 '76 911S Targa '83 930S Slantnose (13000 miles) '86 951 Prototype Testcar built in '84 (56000 miles) Serial #00014 '86 951 '87 944 "Life is short , drive Fast" |
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05-09-2005, 03:05 PM
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Registered
Join Date: Nov 2003
Location: Charlotte NC
Posts: 1,197
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could be the valve stem seals, but id sure like to see those comression numbers.
Reason I ask, is that a 951 I had before had those same symptoms, turned out #3 was scored and had 90psi on the gauge. At High RPMs it was leaking from the crankcase vent and sucking the oil through the turbo. Not trying to scare you or anything...but id get on that test. Its just a little time consuming. Wont cost you a thing really.
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Current: 1973 914/4 project. FOR SALE |
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05-09-2005, 03:16 PM
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I was thinking rings or scoring or both. Smoking on aggressive high rpm acceleration is a sign of valve guides.
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Hugh - So Cal 83 944 Driver Person NOT a 'real' Porsche -- Its Better!!!! When was the last time you changed your timing and balance belts and/or cam chain and tensioner? New Users please add your car's year and model to your signature line! Never break more than you fix! |
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05-09-2005, 05:11 PM
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1983 Porsche 944 2.5 liter
