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1986 944 Turbo Loss of Compression

Engine

Vehicle Information: Model(924/944): 951; Year: 1986; Engine (type, size, modifications): 2.5 Turbo; Total Mileage: 86,000;

After a drivers education event last weekend, my 951 with 86K miles began to run rough and lacked power. My intial reaction was that it felt like only 3 cylinders were firing. There were no other obvious symptoms (smoke, high temperature, fluids mixing), and the car ran great at the event. My initial hunch was true, as the number 2 cylinder has absolutely no compression. The mechanic who diagnosed the problem indicated the valve could be hanging (damaged spring), or burnt, or broken. My first question is how could this happen? My car is not modified (stock boost), and was not run hard at the event (no redline or rev limiter). My second question relates to the repaire cost. I was quoted $1,500 (which included 16 hours of labor) to remove the head, replace the damaged valve, and re-assemble the motor. Is this a fair price? Finally, while the repair is being completed, should I consider other things such as rebuilding the whole head, replacing timing belts, etc.?

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