| Weekly
                Column Click & Clack Talk Cars
 By Tom and Ray
                Magliozzi
 Dear Tom
                and Ray: I was selling an old car that
                was starting to burn oil. One of the guys who
                looked at the car pulled the oil filler cap and
                the engine died immediately. He said a mechanic
                buddy told him that this is a test for bad
                compression. We tried it on his car, and it
                didnt miss a beat. I had never heard of
                this before. Is this a true test, and why does it
                work? - Rick. TOM: Hmm. Sounds good. But
                its baloney, Rick. RAY: Theres no
                relationship between the oil cap and the engine
                conking out. Unless the car in question is a
                Saab. TOM: For some reason,
                weve found that on many Saabs, when you
                remove the oil cap, the engine WILL stall. But
                thats just due to an engineering quirk that
                produces a massive vacuum leak when the oil cap
                is off. I have no idea if it was intentional on
                Saabs part. It is the only car I know of
                that does it. RAY: There might be other cars
                that do it, but were not in the habit of
                removing the oil caps from cars that are running.
                For one thing, theres never any need to.
                And for another, it always sends oil splashing
                all over my newly cleaned and pressed coveralls. TOM: However, what you CAN tell
                by removing the oil cap is whether the car has
                excessive blowby. Blowby is created when the
                rings wear out and lots of combustion gasses
                sneak by the rings and into the crankcase, where
                the oil is stored. RAY: If there are more
                combustion gasses in the crankcase than the
                ventilation system can expel, pressure builds up
                in there. When you remove the oil cap, you might
                smoke coming out. TOM: Thatd be a sure sign
                that youd want to avoid buying that car.
                Maybe thats what this guy had in mind.  
 RACINGBy Greg Zyla
 Sponsored by Curry Automotive
 Southern 500 Was a
                NASCAR Tradition Q: Greg, I just watched the
                500-mile race from Darlington, which was sold out
                and run under the lights for the first time. It
                was great. Still, I hear rumors of NASCAR
                eliminating Darlington from its schedule, if not
                in 2006, then in 2007. What are your feelings?
                 Sandy P., South Carolina A: Sandy, if ever there was a
                "right time" for race fans to push for
                the ultimate saving of the Darlington racetrack,
                now is the time. I feel that NASCAR should
                reinstate the Southern 500 on the date it should
                be run, Labor Day weekend. As for two races at
                the track, I dont see that happening, but
                the Southern 500 is the second most popular and
                respected race in the United States, behind the
                Indy 500. At this time, there really is no Labor
                Day Southern 500, as the date has been moved to
                May. First run in 1950 on the first
                superspeedway built for NASCAR stock cars,
                thousands jammed the Darlington facility and saw
                Johnny Mantz in a Plymouth take the win. You just
                cant treat legend and history the way
                NASCAR has over the past few years in this
                Darlington situation. It would be a major mistake
                to remove Darlington from the schedule, and even
                though the race was sold out with more than
                60,000 fans on hand, insiders say that Darlington
                is still one of the tracks that could get the
                "ax" in the future. |