After everyone gets these different variations fired up, I would like to see the different horsepower/weight figures.  I think it would help all future builders to get a consensus of what works best.  We saw weight and tunability as major factors here.

Greg Ward

 

Greg;

 

Would be interesting.  Because of so many other variations, and lack of dyno data; hp comparisons will be difficult.  I’ll ‘weigh in’ with mine. See photo.

 

I probably have the most compact intake manifold on a 20B, and it weighs 2.7 lbs.  The TWM TB, with fuel rail and injectors weighs 5.7 lbs. The fiberglass ‘airbox’ weighs about 1.5 lbs. Total induction sys – 10 lbs.

 

Under the SS baffle is an inconel manifold muffler (12.5 lbs) backed up by a secondary muffler (3.5 lbs); total exhaust system weight, with support bracket, 17.5 lbs.  Starts easily, no tuning issues. I run the EC2, but stage the primary; so start and below 16.5” MAP runs on the injectors in the TB – gives smoother idle.

 

My design emphasis was compact, lightweight.  This NA configuration, with stock 9.0 rotors, was run on the dyno, and produced the torque/hp curve (adjusted to standard day, sea level) attached.  My 2.17 redrive, and 3000 max rpm on the prop allows me to go to 6500 rpm; although my WOT runs at altitude have never exceeded 6300.

 

Plenty of power for my Velocity SE RG; which now has 150 hours in the air; with no glider time.

 

Al G