 Smoke on Startup, 3.0 CIS six |
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| brilliantrot |
  May 15 2007, 08:37 PM
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#1
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Member  Group: Members Posts: 125 Joined: 27-April 07 From: Costa Mesa Ca. Member No.: 7,699  |
My dad is uprgading from his 912E to a 75 911s with a CIS 3.0 as an autocross car. He is doing this because he is tired of loosing to my 914 and because he cant mod the 912E due to Smog because it is a 76. My question is the motor puffs a rather large cloud of smoke out the exaust on startup concistantly hot or cold but has a totally clean exhaust while running and reving. What would cause this? the motor is supose to have about 30K on it and AASE Motors verifies that the wear on the engine looks to be about this milege while they were replacing the head studs. The only thing that i can come up with is that when the motor is not running some of the 11 plus quarts of oil sitting above the engine runs back filling up the bottom of the engine up to the pistons with some oil leaking past the rings. Is this possible? It makes sence to me because the oil tank gadge goes up (reads more oil) once the engine is started and the massive scavenge pump kicks in. Have any of you 914-6 guys experienced this? Would moving the oil tank to the front solve this? My dad is realy bumbed about this smoke because this engine alone costs more than the entire 912E. Makes one realy appriciate the simplicity and reliability of the T4. I do not know if it makes a difference or not but it is baised on a 3.2 case with the Carrera pump.
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| Series9 |
May 15 2007, 08:52 PM
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#2
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Lesbians taste like chicken. Group: Members Posts: 5,444 Joined: 22-August 04 From: DeLand, FL Member No.: 2,602 Region Association: South East States |
It's pretty common and is due to the observations you made about oil settling.
It should stop right after start-up. It it does, I wouldn't worry about it. |
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| brilliantrot |
May 15 2007, 09:46 PM
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#3
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Member Group: Members Posts: 125 Joined: 27-April 07 From: Costa Mesa Ca. Member No.: 7,699 |
Would moving the oil tank to the front of the car stop the smoke? If so, is it ok for the oil tank to be lower than the motor. Will this creat the need to purge the line of air? Will the engine take longer to get oil pressure if the scavenge pump has to move oil all the way to the front and back? Sorry for all of these noob questions but the puff of smoke makes the car some what unacceptable to drive other than as a race car and neithor my dad nor I have any experience with drysump engines.
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Posts in this topic
brilliantrot Smoke on Startup May 15 2007, 08:37 PM
9146986 Don't worry about it. Drive the car and enjoy... May 16 2007, 07:43 AM ConeDodger Tell your dad he has a bigger problem than the smo... May 16 2007, 09:45 AM sww914 Almost all of them do that. I would say all of the... May 19 2007, 10:26 AM brilliantrot ya.The smoke is not that thick but it is enough th... May 21 2007, 06:32 PM
rfuerst911sc You can also play around with different brands of ... May 22 2007, 05:06 PM |
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