My carb trumpets, now with filter sicks on, are very close to the inside of the bonnet carb one is more or less touching it. Question is being so close will they struggle to breath enough air, not sure whether to leave them as they are or cut a hole in the bonnet to let them breath better. What do you guys think is best?

[Edited on 9/4/10 by norfolkluego]

cut a hole, not only will air flow be restricted but it will be horrible hot air getting sucked in too!

I think you answered your own question

as a general rule;

the absolute minimum clearance between a trumpet and airbox(or bulkhead) is 30% of its total outside diameter (including radius part)

example:

50mm trumpet = 15mm minimum clearance.

- colin.

spend your time on doing a nice but in the bonnet. Engines only need three things to work and you may be robbing yours of one of the most important ones.

quote:

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Originally posted by norfolkluego
Question is being so close will they struggle to breath enough air

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you need 1 choke diameter's distance from the mouth of the trumpet to the nearest solid object as a minimum.

quote:

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Originally posted by smart51
you need 1 choke diameter's distance from the mouth of the trumpet to the nearest solid object as a minimum.

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