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Date: Fri, 18 Feb 2005 13:40:53 -0600
From: Jim Sower <canarder@frontiernet.net>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Return Fuel Line Sizes Clarification
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<... can drill them out to at least the ID of the 5/16 inch hose barb ...>

That's exactly what I did.  The drill turned out to be 1/64" smaller 
than the 1/4" I was shooting for, but I figure if works for Tracy, it'll 
work for me.  I could drill it out to 1/4" or even a tad bigger if I 
thought I really needed it, but then I'd be worried about structural 
integrity.
Jim S.

Bob White wrote:

>Thanks again Leon.
>
>That's a good point about the EFI pump outlet size.  I bought my pumps 
>from Tracy and they have 5/16 inch hose barbs on the inlet and outlet.  
>The outlet is threaded 3/8-24 so I ordered two AN-3 to AN-6 adapters 
>(two pumps).  Back in January Jim Sower reported finding them at XRP.  
>The AN-3 side only has a 1/8 inch hole, but since I'm using an 'O'-ring 
>to seal, not the cone, I can drill them out to at least the ID of the 
>5/16 inch hose barb.  If that's more than 1/4 inch, I will just drill 
>them at 1/4 inch.  It looks like I'm in good shape to just use a 
>standard EFI setup. 
>
>Bob White
>
>On Fri, 18 Feb 2005 20:24:10 +1100 "Leon" 
><peon@pacific.net.au> wrote:
>
>  
>
>>Hi Bob,
>>
>>Thanks for the comments.  Upon re-reading what I wrote,  I do need to
>>clarify what I wrote last post.  I should have been a little more succinct
>>in my statements,  as it sort of conveys a meaning slightly different to
>>that which I had intended.
>>
>>    
>>
><snip>
>  
>
>>The reason for this is that when you look at the OUTLET of most factory EFI
>>high pressure pumps,  the INSIDE diameter of outlet nipple on the pump is
>>quite tiny,  which is why I usually can get away with using 1/4" return
>>lines.  The ID of the pump output nipple is the thing that limits the flow
>>capacity of the whole system.
>>
>>    
>>
>
>  
>
>>Cheers,
>>
>>Leon
>>
>>
>>    
>>
>
>  
>
>><snip> 
>>    
>>
>
>  
>