647jc
Well Known Member
I'm installing the standard Van FAB on an O320 RV9A. Have read in the forums that just drawing in warm air from inside the cowl didn?t work very well so I purchased an EC100-020 heat muff from Wicks per forum recommendations. The muff fits over the exhaust crossover and the design is such that air must be ?sucked? through it.
I?ve noticed several pictures on the forum showing similar muff installations, some using Vans Carb Heat muff of similar ?sucking? design but then connecting the muff to the air box using Vans Carb Heat connector which has about a ?? standoff ?to allow hot air to escape when carb heat is not selected and allows full operation of lever opening alternate air door? according to Van.
For a pressurized muff installation the stand-off would definitely be desired but for a 'sucking' muff design the ? inch standoff would really impede the air box from sucking through the muff so I wonder if this combination of components is a very good idea. I?m thinking of using a regular tight fitting aluminum duct fitting on top of the air box but am concerned with interfering with the carb heat flap / door. I'm also concerned with restricting the engine breathing through a 2" scat tube when carb heat is fully applied.
Would be interested in comments and pictures of alternative installations.
I?ve noticed several pictures on the forum showing similar muff installations, some using Vans Carb Heat muff of similar ?sucking? design but then connecting the muff to the air box using Vans Carb Heat connector which has about a ?? standoff ?to allow hot air to escape when carb heat is not selected and allows full operation of lever opening alternate air door? according to Van.
For a pressurized muff installation the stand-off would definitely be desired but for a 'sucking' muff design the ? inch standoff would really impede the air box from sucking through the muff so I wonder if this combination of components is a very good idea. I?m thinking of using a regular tight fitting aluminum duct fitting on top of the air box but am concerned with interfering with the carb heat flap / door. I'm also concerned with restricting the engine breathing through a 2" scat tube when carb heat is fully applied.
Would be interested in comments and pictures of alternative installations.