Paul-

   Looking at my fuel pumps, I see that they are designed to use flexible
   hose, using a clamp.  The intakes on each can be removed & an AN style
   fitting substituted, but the outputs look like they cannot be modified.

   Can you recommend a part number from McMaster Carr for appropriate
   hosing from the pumps to the fuel rail?  I'm not wild about using hose,
   but don't see that I have a choice.  I'd like to order all the fuel
   system bits today or tomorrow so I can start installing it over the
   weekend.

   Mark

   That is a very unfortunate part about those MSD pumps. I wish I could
   find a high pressure fuel pump with all AN fittings.
   High quality small hose clamps are the main problem. Looks like
   smooth bore
   Miniature Machine Screw Hose clamps 53175K62 looks the best.
   Careful what you buy in the hardware. Store some clamps are made from
   mild cheap steel.

   I would get the U-build SS braided Teflon in 5/16 or 13/32
   ID. You will have to get some or measure the barb carefully
   to get the right size. 52515K13 or 14


Interesting -- are you moving away from the constant-tension clamps
you've recommended in the past?  Or, is this a size thing where constant
tension clamps aren't available at this small size?

Mark & Mark

In the case of 1/4 inch and 3/8 inch hose barbs the ratio of the ridge
(for lack of a better word) height to barb dia really does not call
for a constant torque clamp even if they were available in
this size which I don t think they are. The expansion and contraction
with temp. of a hose barb in this diameter would be in the .0005 inch
range I suspect. Also if your fuel is 220 F you got other, more serious
problems.

I'll stick with the constant torque hose clamps in the 1 3/8" dia.
to 1 1/2" dia. water plumbing sizes.

Paul Lamar

The Rotary Engine NewsLetter. Powered by Linux.
ACRE NL web site. http://www.rotaryeng.net
Copyright 1998-2005 All world wide rights reserved.