Listening to Car Talk the other day. A young woman calls in, asking whether
driving a short distance at 70 mph in 2nd gear could have blown her father's Volvo's engine.
Apparently she did this shortly after a long overdue muffler repair.
Tom and Ray say no, 70 mph/2nd gear didn't do it; happened as result of valves overheating from lack of backpressure from absent muffler.
Not sure about the backpressure issue, but I think that the 70mph/2nd gear certainly could have wrecked the engine.
It was a manual.
Story was that after she got the muffler repaired, she lost the loud exhaust note cue to shift, and left it in 2nd gear until she hit 70 mph.
I think it's safe to debunk the second explanation. Running w/o a muffler is not going to kill your engine. At least not quickly, maybe over a few years.
yep, not going to happen.
even if she did take it to the redline, i would think that the volvo would have a software rev limiter in there so she couldn't rev past the indicated redline. now if she took it all the way to redline in 2nd and then shifted into first quickly, then that's a different story...
2005 Volvo S60 T5 6-Speed. OEM Lip Kit. 4C. Short Shifter.(Daily)
1999 Acura Integra LS. PIC Coilovers. (Project)
2008 FSAE Autocross Car. GSX-R 600. Torsen LSD. Magnesium Wheels. Pullrod Suspension. (Restoration)
From my understanding, burnt valves are caused by the car running lean. Low backpressure can cause that in older cars, but in newer cars the computer should adjust.
Pish posh. Shitty Volvo.
The vette will do 90 in 2nd.
"It is impossible for the hotness gene to be present without the out of control spending gene coupled to it, unless of course the totally nuts gene is present" ~ steveny
2008 Mazda Mazdaspeed3
1995 Acura NSX-T
The KING of cheap ass wheels and tires... (per TURBO2GO)
I bet the lady is just a lazy shifter, I mean c'mon, even without the sound of a muffler, any driver who knows how to drive a stick knows when to shift. She's just making excuses.
Plus the story didn't mention anything about shifting gears other than staying in 2nd.
My conclusion is that it's just bad luck for her. A Volvo which had a long overdue muffler repair sounds like a pretty beat-up old car. The same could've happened to anyone in her shoes.
1998 NSX-T Kaiser Silver
Well-maintained engines don't just blow up. There has to be a cause. In the absence of any other explanation (e.g. no oil put back in during an oil change), and especially since there are indications of a shifting issue here, the cause is almost certainly a money shift.
NSX. Spread the word.