blue smoke??

[shelbyville]

Every now and then I get a puff of blue smoke when I start the car. It's not much, just a puff, and it happens when the car has sit for some time. It's a '05 GT with 22000 mostly highway miles. Someone told me I may have messed up the valves with the SLP's since I lost the backpressure when I installed them.

[TheClassic]

Is there a certain degree of inefficiency with low back pressure? Yes. Are your valves toast at this point, not necessarily so, but you are well on your way to serious issues if you don't compensate for the loss of backpressure in other areas of the engine. The blue smoke is a sign or wearing/worn valve guide seals.

Here is a great tech article from Flowmaster on engine building and creating a homeostatic neutrality between increases and decreases in backpressure. I would recommend you read it and consider the ramifications of the loss of backpressure to the life of your engine.

http://www.flowmastermufflers.com/backpressure.html

[BOSSY500]

So your saying that by adding exhaust components on these 3V Mustangs you are damaging the engine?

[BOSSY500]

Originally Posted by TheClassic

Is there a certain degree of inefficiency with low back pressure? Yes. Are your valves toast at this point, not necessarily so, but you are well on your way to serious issues if you don't compensate for the loss of backpressure in other areas of the engine. The blue smoke is a sign or wearing/worn valve guide seals.

Here is a great tech article from Flowmaster on engine building and creating a homeostatic neutrality between increases and decreases in backpressure. I would recommend you read it and consider the ramifications of the loss of backpressure to the life of your engine.

http://www.flowmastermufflers.com/backpressure.html

And what about the ever popular pypes mid muffler system? Will the straight through design like that deliver the same results?

[gtgtgt2005]

I first noticed it with my buddies 07GT. We were leaving for a show and a good puff came out. I noticed mine did it once with my stock pipes and cans. It was only that 1 time though. I have been keeping a close eye on it and it hasn't happend again as far as I can tell. I had a jlt-cai with a sct-x2 93 oct tune when I noticed the smoke. Since I have added Pipes violator cans and still haven't noticed it since that 1st time. My car is parked for the winter and only gets started every couple of weeks. The last time was this past Fri.Jan.25. It had sat for a month or so prior to that. Still no smoke.