fiatfactory
Steve Cecchele
Nice work Brad, I really like the home made bell mouths :thumbsup: ...I never got the hang of the metal shaping thing in high school metalwork class...if your ever thinking of making more let me know and I'll put in my order for some to suit 44's (without a cut off rolled lip between the throats)
I would agree that more "top" clearance would be preferable, but if you have the box as tall as you can for engine cover clearance that's about as tall as it can be...as always most things about engine building and prep are about reaching a workable compromise.
One small thing I would change is the fact you have a flat air box top. If you loook at "factory" items, like the 124BC air box (even though that has it's own design compromises) the lid is usually domed or rounded above the carburettors.
The top being domed assists with the actual "ram charge" effect due to wave action, as the sound waves emitted from the open end of the inlet tract don't hit a surface that is 90 degrees to their travel... getting pedantic I know, but all these little things add up... and can make a noticeable difference, just like the result you got from changing to an airbox in the first place.
Your absolutely correct with the "stand off" comment too.
Rough (minimum) rules of thumb for airboxes, if anyone is interested, is approx 2 x throttle size top clearance above any air horns, and approx 3 x throttle size to the air inlet away from the closest carb opening, and approx 3 x engine capacity in total volume... but usually all these are limited by the available space.
SteveC
I would agree that more "top" clearance would be preferable, but if you have the box as tall as you can for engine cover clearance that's about as tall as it can be...as always most things about engine building and prep are about reaching a workable compromise.
One small thing I would change is the fact you have a flat air box top. If you loook at "factory" items, like the 124BC air box (even though that has it's own design compromises) the lid is usually domed or rounded above the carburettors.
The top being domed assists with the actual "ram charge" effect due to wave action, as the sound waves emitted from the open end of the inlet tract don't hit a surface that is 90 degrees to their travel... getting pedantic I know, but all these little things add up... and can make a noticeable difference, just like the result you got from changing to an airbox in the first place.
Your absolutely correct with the "stand off" comment too.
Rough (minimum) rules of thumb for airboxes, if anyone is interested, is approx 2 x throttle size top clearance above any air horns, and approx 3 x throttle size to the air inlet away from the closest carb opening, and approx 3 x engine capacity in total volume... but usually all these are limited by the available space.
SteveC