Looks good Bob

I met Bill Alexander and got to see and fly his CH750 this weekend.  His 912s installation is first class and includes the Rotax intake manifold.  He did not have to cut or modify the manifold to fit his aircraft, and he also has the manifold set up to use cold filtered air from a NACA scoop that he grafted into the left side of the cowl.  Bill also welded a lightweight shrould that straddles the muffler and supplies warm air to the carb heat valve on the Rotax tubular intake manifold.  Bill's set up is great because his engine is breathing cool ambient temp air which helps make full power, it also runs much quiter because the intake manifold is a great intake noise silencer, and he has carb heat when he needs it, and can turn it off when it is not required.  Did I mention that his set up looked as good as any factory installation that I have ever seen?

Allan

This is Conrad Watters engine setup. I fly as an Advanced Ultra Light Aircraft in Canada, and do not have either the Rotax 912 intake pipe or this type of carb heat. If registered as Experiment or Amatuer Built in Canada you can fly with a higher gross weight, but MUST have carb heat regardless of weather the engine / cowl configuration. I watched the engine install with the 1st Rotax 912S in a CH750 "Catnip" built at Can-Zac and that is where I observed the Rotax intake having to be cut apart , rotated and re-welded to fit under the cowls. Is your intake pipe Rotax supplied or after market via Zenith? Its funny that Rotax "tuned intake pipe" guarantees a full 100 hp when used with the Rotax stainless exhaust, but what Rotax does not say is that the use of K&N conical air filters instead of the intake of the $1,200 pipe actually dynos at 105 hp. Its mis-representation through omission to sell the pipe.

It may make 105 HP on the dyno sucking cold air without being confined in a cowling, but I bet you loose some power by not having a cold air induction, then there is the issue of always having carb heat with the coolant heated carbs, not to mention having more hoses and clamps to possibly leak coolant.

Just as important as the horse power numbers is the ability of the Rotax 912S to swing a 72 inch dia. prop for STOL performance. Other engine manufactures claim more horse power, but their crank shafts can only swing a 64 inch dia prop, and must spin it at faster rpm. I have Rotax 912 engines... never had any issues with either of them. 

Bob ,what are the sensors on the intake bolt just above the heads?

and where did you get a adaptor for the fuel pressure guage   metric to NPT?

Tracy, those are heating elements that are part of an engine preheating system.

Tat is a Tanis engine preheater on Conrad's engine. I have a Reiffe heater on my CH750. The Reiffe has a 100 watt element expoxied to the bottom of engine block, and 50 watt gear clamp style heater around the oil tank on the firewall (dry sump engine). The red cube is a fuel flow sensor and round grey sensor is a manifold pressure sensor.