<div style="margin-bottom: 12pt"><span style="font-size: 14pt">When working on a carb, i have always made sure that the diamond slit in the spray bar was pointing at the intake manifold on four strokes and the crank on two strokes. I'm questioning that now.

I've been looking at Walbro carbs for a gas conversion and I ended up with a couple barrel carbs. The slit in the spraybar on them is 90 degrees from what I've been doing. Seeing that they are fixed iin those carbs, IE not movable or removable, it must be part of the design of the carb. After seeing this, I dug out my old "Elementary Fluid Mechanics by JohnK.Vennard&rdquo; text book and</span><span style="font-size: 14pt">looked up "Flow about Immersed Objects". The attached photos are two figures from the book on flow around a cylinder, IEa spray bar. They indicate the lowest pressure is at the 90 degrees to the flow.This would give the best fuel draw.So, it looks as if I&rsquo;ve been doing and recommending a faulty alignment of the spray bar.</span></div><span style="font-size: 14pt">Comments?

Don</span>