X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail-bw0-f224.google.com ([209.85.218.224] verified) by logan.com (CommuniGate Pro SMTP 5.3.2) with ESMTP id 4124088 for flyrotary@lancaironline.net; Sat, 13 Feb 2010 13:58:39 -0500 Received-SPF: pass receiver=logan.com; client-ip=209.85.218.224; envelope-from=lehanover@gmail.com Received: by bwz24 with SMTP id 24so1503267bwz.9 for ; Sat, 13 Feb 2010 10:58:03 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:date:message-id:subject :from:to:content-type; bh=rtaDu6zJIH8jBpznnHzH+T4GY6S3YRQFamGfvt0rZSk=; b=TrxSOAj2FELvNw994Q01JT6TUgtbbOvslIbWQl+Claxd6ZaMJnTVYmGh1yhQbtTTv9 4qt6rK279blUCvQXT0yVrb4RxL3GDCxXj5Puj7kBLqBCeZ28SUktRf+A5glaESzEDAJR idzRb7xYm3M9W2jcLAP6vFGYxXPkAo38CPFgY= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:date:message-id:subject:from:to:content-type; b=hJMByHPRP/3C63puyFxj6kqrmAbgd9Pql/cYw+k7fr47QegvP7ncW78e2mWBlthy5u vbCHv3atiCdFHwUnBqj3XMPf+hdGCmM7QqCLg3JFHc3A4KgPL04PhOIORcwuhChkl0q8 MQCTDWn6iiEtnnxNKS/HVd3rRZMAn5QyUx0rU= MIME-Version: 1.0 Received: by 10.204.129.82 with SMTP id n18mr1865639bks.132.1266087483614; Sat, 13 Feb 2010 10:58:03 -0800 (PST) Date: Sat, 13 Feb 2010 13:58:03 -0500 Message-ID: <1ab24f411002131058p21411b21r68d051e398e73b10@mail.gmail.com> Subject: Injector position From: Lynn Hanover To: flyrotary@lancaironline.net Content-Type: multipart/alternative; boundary=0015174765c0b72762047f7ff6e1 --0015174765c0b72762047f7ff6e1 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable Jeff, you will probably get a number of views on this topic. There are those who believe injecting the fuel nearer the TB (further from the intake ports) will give better mixing of air and fuel and more importantly more time for the fuel to turn from liquid droplets to vapor/ga= s therefore better efficiency. There are others that believe whatever mixin= g benefit you get you lose something because now there is a longer run with metal walls to cause the fuel to adhere to the walls and not mix as completely. Like most things probably a bit of validity to both views. I have tired it both ways. I had a 75mm TB and four injectors sitting approx 18=94 from the intake ports. I could not tell if there were any increase in efficiency or power =96 there may have been but with the limitation of my instrumentation you just could not tell whether there was or not. It certainly wasn=92t significant. However, what I did encounter was if I suddenly opened the throttle, the engine would bog or hesitate =96 the engine never stopped, but I found tha= t this used up more seat cushions on a go-a-rounds {:>). So I went back to putting the primary injectors in the block and secondary injectors as close as I could get to the intake ports. I personally like this arrangement. YMMV. My 0.02 worth Ed Ed Anderson All of that plus: Throttle body injection (became a universal term like Kleenex) was used early on, when GM and others couldn't bring themselves to buy a license from Bosch for electronic fuel injection, so they came up wit= h a single big injector planted in the bottom of what they knew how to do. Build carburettors. So the throttle body and the (single big) injector were in the same place. Not as good as real fuel injection, and, not as good as = a well tuned carburettor. And still GM went under. Now typical close in injectors (low and medium speed?) are now in the block or head casting and the out injectors (high speed?) are just a few inches out from the head. Now, the throttle body is dry and contains only an air control valve and some sensors like airflow and throttle position. Lynn E. Hanover Mearly 67 years young. --0015174765c0b72762047f7ff6e1 Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: quoted-printable

Jeff, you will = probably get a number of views on this topic.

=A0

There are those= who believe injecting the fuel nearer the TB (further from the intake port= s) will give better mixing of air and fuel and more importantly more time f= or the fuel to turn from liquid droplets to vapor/gas =A0therefore better e= fficiency.=A0 There are others that believe whatever mixing benefit you get= you lose something because now there is a longer run with metal walls to c= ause the fuel to adhere to the walls and not mix as completely.=A0 Like mos= t things probably a bit of validity to both views.

=A0

I have tired it= both ways.=A0 I had a 75mm TB and four injectors sitting approx 18=94 from= the intake ports.=A0 I could not tell if there were any increase in effici= ency or power =96 there may have been but with the limitation of my instrum= entation you just could not tell whether there was or not.=A0 It certainly = wasn=92t significant.

=A0

However, what I= did encounter was if I suddenly opened the throttle, the engine would bog = or hesitate =96 the engine =A0never stopped, but I found that this used up = more seat cushions on a go-a-rounds {:>).=A0 So I went back to putting t= he primary injectors in the block and secondary injectors as close as I cou= ld get to the intake ports.=A0 I personally like this arrangement. YMMV.

=A0

My 0.02 worth

=A0

Ed

=A0

Ed Anderson

=A0

All of that plus: Thr= ottle body injection (became a universal term like Kleenex) was used early = on, when GM and others couldn't bring themselves to buy a license from = Bosch for electronic fuel injection, so they came up with a single big inje= ctor=A0 planted in the bottom of what they knew how to do. Build carburetto= rs. So the throttle body and the (single big) injector were in the same pla= ce. Not as good as real fuel injection, and, not as good as a well tuned ca= rburettor.=A0And still GM went under.

=A0

Now typical close in = injectors (low and medium speed?) are now in the block or head casting=A0an= d the out injectors (high speed?) are just a few inches out from the head. = Now, the throttle body is dry and contains only an air control valve and so= me sensors like airflow and throttle position.

=A0

Lynn E. Hanover

Mearly 67 years young= .

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