The general guideline is the longer the airhorns are the more low rpm
power you'll get. Measure from intake valve to airhorn and you will get
about 18-20 inches on many engines with peak hp about 6000 rpm. The
ideal length for any engine will have to be determined by dyno tests. I
have seen curved airhorns on cars where space around the engine is a
problem.
Thomas
citerar Bryan Martin <bmartin@tlvengineering.com>:
> Hello All,
>
> Wanted to ask for input on air horn length considerations. I'm
currently
> running Mikuni 44's with my 2.0L which has a more aggressive cam and
> porting. I'm more interested in low end performance if that can be
> affected with air horn length.
>
> TWM has air horns listed for these carbs which are either 12mm, 38
mm, or
> 50 mm. I don't want to go longer than 50 mm since I'm going to
install a
> cold air box which will limit the length of the air horns I can use.
>
> Any input would be appreciated.
>
> Thanks,
> Bryan
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