From: kenpowell@comcast.net
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: fuel injector prices
Date: Fri, 07 May 2004 02:08:32 +0000
Message-Id: <050720040208.23664.409AEFA00001F94400005C702200762302FF93939A88908F919A@comcast.net>

 

Judging from the predominance of big injectors and high fuel pressure among this group, it sounds as if you guys have all been indoctrinated by Paul Lamar (Bigger & More is Better!)  It just ain't so!  Remember, we are not pushing the limits of what the engine is capable of, and that's just the way it should be.

 

Tracy

 

Some folks say bigger is better; others say size doesn’t matter – but the reason we use the 550 cc/min injectors is because they come with the engine, and replacements are very spendy.

 

Al

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Take a look in the Mustang magazines:  38 and 42 lb injectors sell for between $295 and $395 for a set of eight.  So call it $200 for a set of 4 if you split the costs with someone else.  Brands vary, but are usually Bosch.  I'm going to start with 38 lb injectors at 38 PSI - should be good for about 230 HP at 80% duty cycle and 0.5 BSFC.  Would also be good for ~245 HP at 44 psi.  Note that if NA these will not be working very hard at cruise altitudes.  If turbo I would probably go with the 42's just to keep the duty cycle a little lower.

Ken P.