AA45 parabolic pipe set up

[Don Ferrette]

I'm doing a build and set up for a friend and was wondering what pipe length is working well on the AA 45 engine (angled carb) with the AA 45 parabolic pipe in riggers. Just trying to determine where the pipe mount needs to be approximately.

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[David Murany]

We ran them at 9 inches. I would suggest starting at 9 1/4.

 

[John Knight]

Don,

I have been inside of 9" to 9.5", Picco blackheads. I would use about 9 - 9.25" as a good baseline, same as David noted.

 

[Don Ferrette]

Thanks for the input, I'd still like to hear from anyone who has run this particular combo of motor and pipe.

 

[anthony_marquart]

I am running the same combo.. 9.5 is where I would probably start... it's where I will start my new build..

 

[Paul Traufler]

I used this setup (straight carb. version) and did the 9.5" and went down to just over 9". The AA pipe is nice but be careful it can dent pretty easy.

Paul

 

[anthony_marquart]

yep,.. mine has big dent on muffler section..

 

[brad nichols]

9 1/4 9 3/8 work for me with AA 45 with straight carb at 2500 feet.

Brad

 

[vision race boats]

To set the pipe mount 9" to 9.5" but as you know it will also depend on the prop, with a 1655 i found anything under 9 1/8 the boat started to slow down, to much loss of torque.

 

[Ted buckley]

Thanks for the input, I'd still like to hear from anyone who has run this particular combo of motor and pipe.

Don, I made my own pipe bracket & strap that mounts to the radio cover. Angle aluminum bar stock and strap material.

Bracket is measured @ 14-3/8" back from center of engine. Mount is 22mm long with 3 holes spaced @ 6mm on center.

Strap is 35mm long. This gives me telescoping for the pipe at anywhere from 8-3/4 to 9-1/2". It holds very tight. Hope this helps, unless you already found your answer.