X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Mon, 08 Sep 2008 15:30:14 -0400 Message-ID: X-Original-Return-Path: Received: from imo-m23.mx.aol.com ([64.12.137.4] verified) by logan.com (CommuniGate Pro SMTP 5.2.7) with ESMTP id 3118800 for lml@lancaironline.net; Sun, 07 Sep 2008 20:19:22 -0400 Received: from Sky2high@aol.com by imo-m23.mx.aol.com (mail_out_v38_r10.8.) id q.c1d.4a3cfcde (48576) for ; Sun, 7 Sep 2008 20:19:18 -0400 (EDT) From: Sky2high@aol.com X-Original-Message-ID: X-Original-Date: Sun, 7 Sep 2008 20:20:37 EDT Subject: Re: [LML] Fuel servo X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1220833237" X-Mailer: Unknown sub 34 X-Spam-Flag:NO -------------------------------1220833237 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Maurits, Advancing the timing is a mistake. You have increased base HP to above 100%. Advancing the timing is only a benefit at lower power because best power delivery is slower. A computer controlled electronic ignition might even retard the timing (on a curve) at the power you are attempting to make. More importantly, you are correct that you are probably running too lean. However, the RSA-10 is not a carburetor, thus "jet size" is not an appropriate concept. You must have the servo's flow adjusted at a facility capable of doing so. Grayhawk In a message dated 9/7/2008 5:09:29 P.M. Central Daylight Time, mvr7@hotmail.com writes: Hi all, I have a RSA-10 fuel servo on my IO540 that is in a Legacy and.recently I have done 3 modifications : 1) Added an inlet scoop which provides 2" more MP at 200knots 2) Turned up the RPM from 2700 to 2850 RPM 3) Advanced ignition timing by 2 degrees I now find I can not get EGT down below 1370 F. I think I am running too lean. I think it makes sense to increase the main jet size. Is this correct? If so, from what dia to what dia must it increase? If not, what is the solution? Maurits **************Psssst...Have you heard the news? There's a new fashion blog, plus the latest fall trends and hair styles at StyleList.com. (http://www.stylelist.com/trends?ncid=aolsty00050000000014) -------------------------------1220833237 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable
Maurits,
 
Advancing the timing is a mistake.  You have increased base HP to=20 above 100%.  Advancing the timing is only a benefit at lower power beca= use=20 best power delivery is slower.  A computer controlled electronic=20 ignition might even retard the timing (on a curve) at the power you are= =20 attempting to make.
 
More importantly, you are correct that you are probably running too=20 lean.  However, the RSA-10 is not a carburetor, thus "jet size" is not=20= an=20 appropriate concept.  You must have the servo's flow adjusted at a faci= lity=20 capable of doing so.
 
Grayhawk
 
In a message dated 9/7/2008 5:09:29 P.M. Central Daylight Time,=20 mvr7@hotmail.com writes:
<= FONT=20 style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 size= =3D2>
Hi all,
 
I have a RSA-10 fuel servo on my IO540 that is in a Legacy and.recent= ly I=20 have done 3 modifications :

1) Added an inlet scoop which provides=20= 2"=20 more MP at 200knots
2) Turned up the RPM from 2700 to 2850 RPM
3)=20 Advanced ignition timing by 2 degrees

I now find I can not get EGT=20= down=20 below 1370 F. I think I am running too
lean. I think it makes sense to=20 increase the main jet size. Is this
correct? If so, from what dia to wh= at=20 dia must it increase? If not, what is
the solution?
 
Maurits


 


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