Attention: TDR Forum Junkies 
GAmes
TDR MEMBER
Today's paper had an article in it from the world famous car repair guys. A gal wrote in asking if a hole in her muffler was going to cause any hazards to the car or her family.
RAY; Let's start with the car. Any hole in the exhaust system reduces the back pressure in the cylinders, the closer to the front of the car the hole is, the more the back pressure is reduced. And without sufficient back pressure, the exhaust passes by the valves faster, which makes the valves run hot. If they run hot enough, they can melt. And that'll cost your husband a cool $1000.
TOM; While the valves are unlikely to burn out while you're driving around town, it certainly can happen on, say, an 1,100 mile trip.
So look out all you guys with free flow, muffler-less exhaust systems. Forget that over temps will melt the pistons. According to the Magliozzi brothers all those fast moving exhaust gasses are going to melt you valves anyway. :-laf :-laf :-laf
RAY; Let's start with the car. Any hole in the exhaust system reduces the back pressure in the cylinders, the closer to the front of the car the hole is, the more the back pressure is reduced. And without sufficient back pressure, the exhaust passes by the valves faster, which makes the valves run hot. If they run hot enough, they can melt. And that'll cost your husband a cool $1000.
TOM; While the valves are unlikely to burn out while you're driving around town, it certainly can happen on, say, an 1,100 mile trip.
So look out all you guys with free flow, muffler-less exhaust systems. Forget that over temps will melt the pistons. According to the Magliozzi brothers all those fast moving exhaust gasses are going to melt you valves anyway. :-laf :-laf :-laf
