Quote:
Originally Posted by turbochad
I was thinking about the purpose of stock shield as I was doing this, maybe incorrectly. It seemed to me that the stock shield isn't designed to protect the engine from the cat's heat since the shield sits under the cat and not between the cat and the engine. I was thinking that the stock shield is designed to protect the rear tire from the cat's heat and keep heat in the cat from being lost to passing air under the car. The hotter the cat, the better the emissions. It always seemed strange to me that the cat heat shield is more of a skid plate.
The new cat is smaller than the stock one and is now a ways away from the rear tires. there is enough clearance to do a valve adjustment without removing the cat pipe. A heat shield is probably a good idea regardless. A couple of tabs and a curved piece of sheet aluminum should do it.
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Exactly. PAG left out the engine shield. They were more concerned with burning the LR tire and setting dry grass on fire than the engine soaking more heat from the cat. Operating temp of a typical cat under normal conditions is about 900-1500ºF.
Sherwood