Yes, one "blew", but I was driving it, so it had an excuse. IIRC, the s/c blew bits into the motor?
Funny, there is a somewhat parallel debate over on the Miata turbo forum on stud installs, loose or torqued down, and what lube if any on torquing any fastener. Corky Bell is a regular there. He wrote the bible on turbo motors, a knowledgable aero engineer to boot, Nate and John.
Corky uses Moly lube on the threads and washer and bolt head. I would too, if I could find it again. The torque value the wrench tells you is a crap shoot. They talk about preload "scatter" at the same torque value due to variability in the variables I noted above. Not quite random, but not very predictable either. Since the entire procedure is done to get a stated clamping load on the head and gasket, I try to reduce the effect of the variables, primarily thread and bolt head/washer friction. Oil the threads unless the book calls out dry.
What you are doing is preloading a relatively inelastic spring, the head bolt/stud plus gasket, to the required clamping force to withstand pressure and suction forces over kazillions of heat cycles in ambient temps ranging from 100+ down to damncold, for well over 3000 hours of use.
Intersting how small the world of cars is. Corky Bell is an old friend of mine from Dallas, TX days. Corky had a shop over on Ables lane and I was the Regional Vehicle distributor for Nissan Motor corp around thc corner. He wanted to Turbo My Nissan SX and we swapped cars for a week. I was driving his SX with a huge turbo on it,...up Stemmons Freeway the next day....it had NO WASTEGATE,...and a temporary boost gauge taped to the windshield......the theory was that I had to use my right foot to ensure that I didnt overboost the engine..........well, I did when I was passing several lanes of cars by reunion tower,....The big whooshof power was followed by that freakish silence while still doing 80 mph. I was sure I had grenaded the egine. fortunately, I had just blown the hose off between the turbo and intake manifold. I had to cross 4 or 5 lanes of traffic at speed with no engine power, power steering, or power brakes to get to the grass shoulder before I coasted to a halt. I was a suit and tie guy in those days,....there I was on Stemmons Freeway trying to get the boost hose back on with essentially no tools,...got it done somehow, and drove it back to the office very carefully (read: minimal boost), until I could get some tools and get the hose back on tight,.....then it was off and running again...it was a surprising car when you tipped your foot in it.
I never did have Corky Turbo the SX,...I decided to sell it and sell my 280 Z and buy a new 1979 280ZX black and gold limited edition as my next company car. It was the last car we had at the port that ran on regular leaded gas, so, I grabbed it. Every morning on the way in to the office, I had this LONG down hill of a new not yet open highway that I got to run on,.....there was no place for a cop to hide, so that was my daily max speed run every morning.....better than a cup of coffee.
