AB 67 Pipe Length on Scale

[Rich Jones]

The attached link shows a picture of the pipe I'm going to use on my Phil Thomas 1/8 Scale T-5 Hull. I'm using a Picco Blue Head .67 motor. What would be a good pipe length from the glow plug to the weld? I would normally run a 67 between 11 3/4" and 12 1/4" but I've never used one of Andy's pipes. Also, I hear alot about stinger shims and all that. How necessary are these and what do they do?

Andy Brown Pipe

 

[Douglas P Shepherd]

The attached link shows a picture of the pipe I'm going to use on my Phil Thomas 1/8 Scale T-5 Hull. I'm using a Picco Blue Head .67 motor. What would be a good pipe length from the glow plug to the weld? I would normally run a 67 between 11 3/4" and 12 1/4" but I've never used one of Andy's pipes. Also, I hear alot about stinger shims and all that. How necessary are these and what do they do?
Andy Brown Pipe

Rich, I run the pipe @11 5/8 with a CMB and I think the .450 stinger bushing, Maybe start at 11 3/4. Smaller bushing when colder and larger bushing when temp is hoter. But I have nerver changed out. See on race Day Doug

 

[Hurricane]

I measure from the back of the motor right above the exhause and ran the Blue Head at 10 5/8"-10-7/8" on a heavy scale (about 21 lbs.) with a X457/3 or X460 on 55% or 60% fuel. That was with the smallest bushing installed. Also run it 10-1/2 to 10-3/4 on a 14 lbs. scale running the same fuel and props, but the CMB 67H. Likes the X457/3 or the Prather 250 best. The 8255 hull, 1982 U55 Oberto

 

[Rich Jones]

I measure from the back of the motor right above the exhause and ran the Blue Head at 10 5/8"-10-7/8" on a heavy scale (about 21 lbs.) with a X457/3 or X460 on 55% or 60% fuel. That was with the smallest bushing installed. Also run it 10-1/2 to 10-3/4 on a 14 lbs. scale running the same fuel and props, but the CMB 67H. Likes the X457/3 or the Prather 250 best. The 8255 hull, 1982 U55 Oberto

Thanks Guys, just about what I thought. The thing that throws me is this bushing. Do these come as a set or are they purchased individually. Are they hard to get at CMD? Anyone have a set they want to part with?

 

[Russell Bear]

Towards the end of this topic there is some information on the bushings...

http://www.intlwaters.com/index.php?showtopic=13849&hl=