Smoking problem seems to be solved on GTSNAKE's car!
After some practical, systematic analysis, I have figured out that Tom's car was smoking due to the catch can's inlets being frozen.
The crankcase pressure was too high not allowing the oil to return into the oil pan.
I pulled the oil fill cap and momentarily removed the hoses at the front of the valve covers breather vent pipes and the car idled for 15 minutes without smoking.
All the drama for such a simple thing.........
I have already gotten Tom's permission to test drive the car with the new air intake piping when it's ready to go and the weather is appropriate.
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The slippery slope of modding any car often seems unavoidable.......... Just go turbos and avoid all the headaches! LOL!
Last edited by Paolo Castellano : January 25th, 2008 at 02:29 PM.
It's always the simple stuff. I put a throwout bearing in a car and it was still squealing. Turns out the crancase vent hose had collapsed, and the pcv vacuum was causing the rear main seal to squeal like crazy.
The top end of the motor could not breathe at all.
The pressure had to go somehwere, apparently it's easier to go out the oil pan drain bungs and into the oil drain lines and out the turbo oil seals than through a clogged by ice catch can inlet.
I am recommending some -12 breather on top of the valve covers like this:
I think the cross sectional volume of the -12 will be plenty to minimize crankcase pressure!
I apologize for the sloppy wiring in the last picture, the first two are what it looks like finished. Iliked the angle of the last pic though!
Wow, that's crazy. How did that much moisture accumulate in there to freeze them to the point they were occluded and I wonder why it did not melt when the car was running?
And here I thought the motor had exploded into a zillion pieces and killed everybody within a 10 block radius ,
I thought everything I read on the net was true..................
I have 3 twin turbo SRT Vipers in our shop with oil consumption and smoking problems.
The crankcase breather system seems to be part of the problem, but with the turbo's down below the engine I feel a oil scavange system is needed. Any thoughts?
I have 3 twin turbo SRT Vipers in our shop with oil consumption and smoking problems.
The crankcase breather system seems to be part of the problem, but with the turbo's down below the engine I feel a oil scavange system is needed. Any thoughts?
Dan Cragin
Dan, if the turbos oil drains are lower than the engine oil level in the oil pan, you will need a scavenge pump setup.
Mine are up high enough that allows the oil to drain by gravity like it has on Jody Gleason's car no problem.
Tom's car had a restriction for the crankcase pressure release.
It had to go somewhere, it went out the oil drain bungs in the oil pan blocking the oil returning to the oil pan.
I hope it is that simple Paulo - With what you describe having to remove the oil cap even to get enough crankcase ventilation I would immediately be concerned that as someone else mentioned there is a LOT of blowby going on... Also I think you mention it was smoking at IDLE? I guess I would still be concerned that it will still smoke under load/boost/higher RPMS even with improved venting. As you said, it sounds like you have a similar mounting location and oiling setup as other cars you have built and have not had this issue requiring extra crankcase ventilation, so I would be concerned that this car does indeed have a lot more crankcase pressure than the others. I think you mentioned having done a leakdown check on it already, but I would imvestigate further just to be sure.
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1996 Viper GTS UGR 78mm TT
1970 Challenger 572 Hemi
1975 Trailduster Convertible 440 (the tow vehicle!)
