Day at the track ended early...smoking engine….AOS?
03-21-2019, 12:13 PM
#31
Rennlist Member
Thread Starter
Well, my friend, I'm sorry to give the bad news, but if this is the yellow aero coupe - then the patient is done for. Just PM me where I can pick up the rusty, non-running hulk, leave the keys and pink slip on the seat and wave goodbye. I'll handle it from here...
<serious> Hope it goes ok. Sounds like a lot of oil got packed up in there, and overwhelmed the ability to separate, then dumped a bunch into the intake and through the top end.
<serious> Hope it goes ok. Sounds like a lot of oil got packed up in there, and overwhelmed the ability to separate, then dumped a bunch into the intake and through the top end.
03-21-2019, 04:08 PM
#33
Race Director
Did you pop the plenum apart to see if you have any oil pooled in the common oil pool points? If so, you may want to get that drained out - there's theoretically enough oil volume to hydrolock the engine, though smoky puffs is probably a much more likely result...
03-25-2019, 10:29 AM
#37
Rennlist Member
Thread Starter
Every now and then i saw a puff of smoke on the track coming out of a turn once or twice per lap....everyone said its aos...too much oil. so net track day i lowered oil level to half. Same symptom and kaboom on a long right sweeper. one of My rod bearing had disintegrated. Crank shaft for that piston was completely worn.
03-25-2019, 10:58 AM
#38
Every now and then i saw a puff of smoke on the track coming out of a turn once or twice per lap....everyone said its aos...too much oil. so net track day i lowered oil level to half. Same symptom and kaboom on a long right sweeper. one of My rod bearing had disintegrated. Crank shaft for that piston was completely worn.
03-25-2019, 03:08 PM
#39
Rennlist Member
Everyone answered your question already but FYI there was a TSB from Porsche on this about reducing the oil level from 9.25 to 8.75 and then performing a DME program to ensure the low oil light doesn't come on.
03-25-2019, 03:40 PM
#40
Rennlist Member
Every now and then i saw a puff of smoke on the track coming out of a turn once or twice per lap....everyone said its aos...too much oil. so net track day i lowered oil level to half. Same symptom and kaboom on a long right sweeper. one of My rod bearing had disintegrated. Crank shaft for that piston was completely worn.
What was determined that caused the bearing failure?
How many miles on the motor?
03-25-2019, 07:42 PM
#42
Rennlist Member
Thread Starter
yep, oil starvation was the cause on the 54k miles car. Of those miles probably 20% was track miles. it had no deep sump.
03-25-2019, 07:49 PM
#43
Rennlist Member
YES !! There was also a "new style" dipstick that was longer and the "full" mark was .5 liter lower and required a reprogramming of the cluster, to keep from overwhelming the AOS during high G forces. I think a better solution would have been keeping the oil out of the AOS in the first place. With all the track starvation issues that we are seeing, I'm wondering if SOME people are using the "new style " dipstick and programming and also lowering the level to half full, resulting in being a full liter low on oil?
03-26-2019, 03:22 PM
#45
Rennlist Member
Thread Starter
no....previous owner did most of those track miles....i had car since 47k for past 7 years....i have primarily been using car for track. over the four years everything has been replaced. time every mechanical thing has been replaced