X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [64.129.170.194] (HELO VIRCOM1.fcdata.private) by logan.com (CommuniGate Pro SMTP 6.0c1) with ESMTP id 5722503 for flyrotary@lancaironline.net; Tue, 21 Aug 2012 15:01:06 -0400 Received-SPF: none receiver=logan.com; client-ip=64.129.170.194; envelope-from=cbarber@texasattorney.net Received: from FCD-MAIL06.FCDATA.PRIVATE (unverified [172.16.5.23]) by VIRCOM1.fcdata.private (Vircom SMTPRS 5.1.1024.13396) with ESMTP id for ; Tue, 21 Aug 2012 13:59:42 -0500 X-Modus-BlackList: 172.16.5.23=OK;cbarber@texasattorney.net=OK X-Modus-RBL: 172.16.5.23=Excluded X-Modus-Trusted: 172.16.5.23=NO X-Modus-Audit: FALSE;0;0;0 Received: from FCD-MAIL05.FCDATA.PRIVATE ([fe80::809d:a06e:5913:452e]) by FCD-MAIL06.FCDATA.PRIVATE ([fe80::697f:d6aa:b87:78d8%17]) with mapi id 14.01.0379.000; Tue, 21 Aug 2012 14:01:44 -0500 From: Chris Barber To: Rotary motors in aircraft CC: Rotary motors in aircraft Subject: Re: [FlyRotary] Re: Turbo question. Thread-Topic: [FlyRotary] Re: Turbo question. Thread-Index: AQHNf85Uj1mTjMWJm02iOeGR3xSGmpdkntoC Date: Tue, 21 Aug 2012 19:00:29 +0000 Message-ID: <17F83AF7-F4E2-4319-8777-940ED48D2B96@texasattorney.net> References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Dave, thanks, I was hoping you would chime in.=20 Chris Sent from my iPhone 4 On Aug 21, 2012, at 1:54 PM, "Dave" wrote: > Just so everyone has a good visual, Chris is using the Mistral intake... = on the cast piece that includes the throttle body there are three bungs dow= nstream. When I was involved in his project, I plumbed two of those to the = A and B MP sensors and a third to a thermocouple to read manifold air temp/= charge temp. If this hasn't changed, then the readings are coming from down= stream of the TB. >=20 > Dave >=20 > On 8/20/2012 8:57 PM, Chris Barber wrote: >> I am taking the MP reading from the intake before the injectors but afte= r the turbo, pop off valve and intercooler, in that order. I only have a 3 = lb spring in the wastegate currently to control boost. Since I had a detona= tion issue a while back requiring a teardown to replace apex seals, likely = due to too low of octane fuel, I wanted to start with just a little boost a= t first. >>=20 >>=20 >>=20 >> Sent from my iPhone 4 >>=20 >> On Aug 20, 2012, at 8:42 PM, "Ed Anderson" w= rote: >>=20 >>> Chris, >>>=20 >>> Exactly where are you taking your manifold pressure from- >>>=20 >>> I presume it is after the turbocharger compressor - somewhere between = the turbo and the intake manifold OR at the manifold. >>>=20 >>> The only way I can make sense of your reading based on information prov= ided thus far is that you are taking your manifold pressure reading before = the turbocharger compressor inlet. Then the increased airflow caused by th= e turbocharger could cause the pressure drop before the compressor due to f= ilter or other restriction. >>>=20 >>> Even if you have a restrictive filter, the pressure on the compressor o= utlet side of the turbo, the turbocharger on pressure in your manifold shou= ld be higher than without the turbo. >>>=20 >>> You are not spinning your turbo backwards are you?{:>) >>>=20 >>> Ed >>> -------------------------------------------------- >>> From: "Chris Barber" >>> Sent: Monday, August 20, 2012 9:17 PM >>> To: "Rotary motors in aircraft" >>> Subject: [FlyRotary] Turbo question. >>>=20 >>>> As I have mentioned I have had what I think are incongruent readings r= egarding my manifold pressure (mp)and engine rpm. It seems I am getting qui= te low mp as I add power to higher rpm. >>>>=20 >>>> I am not well versed in this area but my thought is that as I add powe= r, even with slight boost (currently using a 3 lb spring in my wastegate) e= ventually my mp should raise a bit more. >>>>=20 >>>> Today I did some static test. I recorded engine RPM with the turbo ho= oked up and recorded the mp at 1000 rpm increments. Then I removed the turb= o plumbing from my intake and recorded the same info My results currently c= onfuse me. >>>>=20 >>>> With the turbo hooked up I am getting >>>>=20 >>>> RPM. MP inches >>>> 2000 - 14.0 >>>> 3000 - 15.5 >>>> 4000 - 19.3 >>>> 5000 - 21.6 >>>> 5700 - 24.5 (topped out) >>>>=20 >>>> With the turbo removed. >>>>=20 >>>> 2000 - 15.8 >>>> 3000 - 15.3 >>>> 4000 - 19.7 >>>> 5000 - 24.8 >>>> 5833 - 29.8 >>>>=20 >>>> Is this indicative of restriction in my plumbing? Perhaps in the inter= cooler? A dirty air filter? A bad pop off valve or a leak not allowing the= air pressure getting to the intake. Or???? >>>>=20 >>>> I am uncertain what other permitters I need to check and provide. I am= just starting my diagnosis in my Phase One testing. I only have 1.6 hours = in the air so far. I value ya'll's direction and input. >>>>=20 >>>> Heck, perhaps this is working properly but it just doesn't seem right/= comfortable. >>>>=20 >>>> Thanks folks. >>>>=20 >>>> Chris Barber >>>> Houston >>>> Velocity SE >>>> Rotary 13b turbo (?) :-) >>>>=20 >>>>=20 >>>>=20 >>>> Sent from my iPhone 4 >>>> -- >>>> Homepage: http://www.flyrotary.com/ >>>> Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/Li= st.html >>>>=20 >>>>=20 >>>> ----- >>>> No virus found in this message. >>>> Checked by AVG - www.avg.com >>>> Version: 2012.0.2197 / Virus Database: 2437/5211 - Release Date: 08/20= /12 >>>>=20 >>> -- >>> Homepage: http://www.flyrotary.com/ >>> Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/L= ist.html >> -- >> Homepage: http://www.flyrotary.com/ >> Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/Li= st.html >> . >>=20 >=20 >=20 > -- > Homepage: http://www.flyrotary.com/ > Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/Lis= t.html