|
|
Lynn Hanover wrote:
1) The engine is a Bruce Turrentine built. Turbo housings and high
>> compression NA rotors. No porting.
>> >> 2) The exhaust is a true 2 - 1 header with equal length primaries.
>> I'm a little sketchy on dimensions but my recall is 1 3/4" primaries,
>> 32" long and equal length into a Burns merge collector 2 1/2".
>> Muffler is 4" behind the collector, 2 1/2" inlet and outlet, 28"
>> long, 4 1/2" diameter. It's a spiral flow design, homebuilt, with a
>> relatively large straight tube through the middle. I dont believe it
>> presents any significant restriction. Internals are Inconel and it
>> was in good shape when I had it off the airplane a couple of weeks ago.
Your exhaust system sounds to be near perfect. I would not suspect problems there.
Perhaps TDC mark may be in error. Actual ignition advance between 20 and 25 degrees?
Poor inlet shape on TB. Needs trumpet bell. F/A around 12.7. EGTs 1600 to 1675?
Lynn E. Hanover
Or poor inlet shape on the intake tubes leaving the plenum, or one other possibility....
The normally aspirated 2nd gen engines were from 135-160 hp. You mentioned that it performs better than your old 160 hp Lyc; maybe you're already getting all there is, short of a 2.85 redrive and retuning the intake.
Charlie
|
|