My wife Amy wrote about the latest mod we have made to our SJ cowl and plenum setup. I have done some local and cross country flights and are happy with the results.
My biggest problems before the new plenum and larger rings was I could not do a quick turn in warm conditions that we have in FL. without climbing out at a fast airspeed 140-150 kias with full power and keep #5 and #6 CHT under 400f and oil temp under 220f.
After a stop with 100 OAT, we were able to climb at 130 kias and keep the CHT's around 390f and the oil at 205f. At cruise at 8000-10,000' ROP or LOP I could
keep CHT's 380-390f and oil temp at 195f, burning 16gal/hr ROP at 184 ktas and LOP at 11.5 gal/hr at 173 ktas.
As Amy stated, we have louvers on the bottom and sides of the cowl and have opened up the bottom of the cowl for more exit area. It is very important to seal around the plenum and the engine, and have a smooth transition from the rings to the ramp for the baffles.
I have 1 slick mag and 1 EIS EI. I feel the EI is a must for running LOP smoothly.
Sam is all about helping out if ya have a problem so give him a call; and call or email me if ya have any questions. Blue Skys Barry
My biggest problems before the new plenum and larger rings was I could not do a quick turn in warm conditions that we have in FL. without climbing out at a fast airspeed 140-150 kias with full power and keep #5 and #6 CHT under 400f and oil temp under 220f.
After a stop with 100 OAT, we were able to climb at 130 kias and keep the CHT's around 390f and the oil at 205f. At cruise at 8000-10,000' ROP or LOP I could
keep CHT's 380-390f and oil temp at 195f, burning 16gal/hr ROP at 184 ktas and LOP at 11.5 gal/hr at 173 ktas.
As Amy stated, we have louvers on the bottom and sides of the cowl and have opened up the bottom of the cowl for more exit area. It is very important to seal around the plenum and the engine, and have a smooth transition from the rings to the ramp for the baffles.
I have 1 slick mag and 1 EIS EI. I feel the EI is a must for running LOP smoothly.
Sam is all about helping out if ya have a problem so give him a call; and call or email me if ya have any questions. Blue Skys Barry