G'day Everyone, As many of you will know I am OCD about sealing every tiny air leak in the Limbach engine bay compartment with silicone, aluminium tape and rubber cowl seals.
I have previously rigged up a water manometer in the cockpit with the tubes running to the top and bottom of the engine. It told me I was getting very good pressure difference but I didn't take much notice of the actual measurements. I think it was somewhere around 30cm. As well as the ram air going into the front of the engine the lower cowl is designed to "suck". We fitted a big scoop type bottom cowl which seems to suck pretty well.... particularly with the baffles tightly sealed with silicon. What I am wondering now is..... What is the effect of this extra suction at the back of the engine on the carbs and mixture? Maybe it is not much different to flying at altitude and the SU carbs altitude compensating ability can deal with it. Any fluid dynamics physics experts in this Dog group who can enlighten me? regards Rob Rob Thompson 0429 493 828
