David-aviator
Well Known Member
This past Friday I showed up at the Barrett skunk works in Tulsa to watch the first start and run of the engine I bought from them.
Promptly at 9 am, the appointed hour, I was in the control booth when the engine was started for the first time. It came to life immediately and sounded great. Just a steady smooth rumble. As it warmed up, one of the guys gave it a close inspection for leaks and anything else not normal. Two small leaks were noticed, one at the oil temp sensor and another at an oil pressure line. The engine was shut down and after about 5 minutes started again. This time it passed the walk around inspection and the test was underway.
The program calls for the engine to run for one hour and thirty minutes. The first part is warm up and then gradual increase to a theoretical cruise condition at 2300-2400 rpm. Every conceivable parameter of the engine is readable in the control booth and recorded in a computer data base. The thing even computes and records BSFC during the entire run. The final part of the run is at full power and then a cool down before shut down.
I have some 8 pages of recorded data, most of which I have not yet deciphered. The system takes a reading every 60 seconds during the run. But perhaps the bottom line is a notation in the log...engine tested after assembly and found to produce 187 BHPc leaned to best power mixture of .51 lb/hp/hr. Not bad for a stock parallel valve Lycoming. Perhaps the difference is the pistons being balanced to within 2 grams, the crank being balanced on whatever that machine is they use to check its spin and the cylinder flow porting. The service at BPE is very satisfying, very professional. They know engines, period.
The engine is solid. The next challenge will be getting in installed and up and running on the RV. That begins this week and with any luck at all, I will be flying in a month or so.
Promptly at 9 am, the appointed hour, I was in the control booth when the engine was started for the first time. It came to life immediately and sounded great. Just a steady smooth rumble. As it warmed up, one of the guys gave it a close inspection for leaks and anything else not normal. Two small leaks were noticed, one at the oil temp sensor and another at an oil pressure line. The engine was shut down and after about 5 minutes started again. This time it passed the walk around inspection and the test was underway.
The program calls for the engine to run for one hour and thirty minutes. The first part is warm up and then gradual increase to a theoretical cruise condition at 2300-2400 rpm. Every conceivable parameter of the engine is readable in the control booth and recorded in a computer data base. The thing even computes and records BSFC during the entire run. The final part of the run is at full power and then a cool down before shut down.
I have some 8 pages of recorded data, most of which I have not yet deciphered. The system takes a reading every 60 seconds during the run. But perhaps the bottom line is a notation in the log...engine tested after assembly and found to produce 187 BHPc leaned to best power mixture of .51 lb/hp/hr. Not bad for a stock parallel valve Lycoming. Perhaps the difference is the pistons being balanced to within 2 grams, the crank being balanced on whatever that machine is they use to check its spin and the cylinder flow porting. The service at BPE is very satisfying, very professional. They know engines, period.
The engine is solid. The next challenge will be getting in installed and up and running on the RV. That begins this week and with any luck at all, I will be flying in a month or so.
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