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Engine basics => Engine set up tips => Topic started by: Leester on January 07, 2020, 12:05:31 PM

Title: 2002 NIB Brodak 40 spray bar
Post by: Leester on January 07, 2020, 12:05:31 PM

I just purchased a NIB 2002 Brodak 40. I was changing the needle from one side to another and noticed the spray bar has two holes drilled in it one across from the other ??? Is this defective spray bar or is it suppose to be like this ??
Thanks

Title: Re: 2002 NIB Brodak 40 spray bar
Post by: Leester on January 07, 2020, 01:30:00 PM

Not sure I follow what your saying. I've never seen a spray bar with the holes going threw front to back ??

Title: Re: 2002 NIB Brodak 40 spray bar
Post by: Leester on January 07, 2020, 03:14:43 PM

I've been educated on the two holer's (lol)

Thanks

Title: Re: 2002 NIB Brodak 40 spray bar
Post by: Peter in Fairfax, VA on January 09, 2020, 08:53:46 AM

Two hole spray bars (straight through drilling) are not that unusual, as this is what is supplied with a Fox .35. 

The basic concept is the venturi effect creates a vacuum that draws fuel through the spray bar.  There are a lot of opinions and observations about where the hole or holes should point, resulting in an opinion that the vacuum will draw out the fuel in many orientations. 

Peter

From Stuka stunt:

> RE: Fox 35 spray bar position"

It's supposed to be front and back, or, with the axis of the holes at right angles to the axis of the venturi. However, it really doesn't matter very much at all. I have seen them run perfectly well with one hole up and the other down.

Brett