X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from EXHUB003-3.exch003intermedia.net ([207.5.74.110] verified) by logan.com (CommuniGate Pro SMTP 5.2.16) with ESMTPS id 3888134 for flyrotary@lancaironline.net; Fri, 16 Oct 2009 09:39:49 -0400 Received-SPF: none receiver=logan.com; client-ip=207.5.74.110; envelope-from=jwhaley@datacast.com Received: from EXVMBX003-5.exch003intermedia.net ([207.5.74.45]) by EXHUB003-3.exch003intermedia.net ([207.5.74.110]) with mapi; Fri, 16 Oct 2009 06:39:13 -0700 From: Jeff Whaley To: Rotary motors in aircraft Date: Fri, 16 Oct 2009 06:39:12 -0700 Subject: RE: [FlyRotary] Re: where's the missing power? Thread-Topic: [FlyRotary] Re: where's the missing power? Thread-Index: AcpOD+Qq0hxodJZmRvi5cpkZV9MqFQAVOIYa Message-ID: References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: en-US Content-Type: multipart/alternative; boundary="_000_C03ABB0A7362B84BB53D544B3C305E0E015365470A4DEXVMBX0035e_" MIME-Version: 1.0 --_000_C03ABB0A7362B84BB53D544B3C305E0E015365470A4DEXVMBX0035e_ Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable Hi Mike, FWIW I have the same cut-down (Mazda) throttle body as you do and = a similar looking intake - mine differs in that it sits ontop of the dynami= c chamber and there is a RAM air scoop for cold air. When I first started r= unning my engine, the top end static rpm was also limited, IIRC it was 5700= rpm; I did not repitch my ground-adjustable prop. I suspected that my igni= tion timing was not quite right, so I follwed the manaul setup supplied by = Lynn and found the timing to be way off - after resetting it to 35 BTDC as = per the EC2 instructions the top end rpm was now 6130 rpm, with RD1C. Jeff ________________________________ From: Rotary motors in aircraft [flyrotary@lancaironline.net] On Behalf Of = Mike Wills [rv-4mike@cox.net] Sent: Thursday, October 15, 2009 11:21 PM To: Rotary motors in aircraft Subject: [FlyRotary] Re: where's the missing power? Sorry for my absence on a topic I started. My nephew had a skateboarding ac= cident last weekend and is in the hospital in a chemically induced coma unt= il his brain swelling is under control. And I thought car powered airplanes= were dangerous. Stay away from skateboards. Tracy - My mixture monitor shows stoich at full throttle. I suspect an airf= low issue rather than fuel. Al - my vacuum gauge is located in the plenum directly behind the throttle = plates. Lynn - I agree that the TB inlet is horrible and needs a bell mouth. The in= let is also pretty obstructed by the cowl which isnt visible in the pics I = sent. I think I'll make an attempt to clean this up some and see if it gets= me anywhere. If not I'll live with it for a while. Kelly - always tough to determine if the problem is an engine issue or if t= he load is simply too much for the engine to overcome. I'm going to experim= ent with the shallow dive several have suggested and see what happens. Mike ----- Original Message ----- From: Bill Bradburry To: Rotary motors in aircraft Sent: Tuesday, October 13, 2009 4:21 PM Subject: [FlyRotary] Re: where's the missing power? Since you have the vacuum gauge, this article will help you use it for trou= bleshooting. http://autospeed.com/cms/A_2393/article.html Bill B ________________________________ From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Beh= alf Of Al Gietzen Sent: Tuesday, October 13, 2009 7:22 PM To: Rotary motors in aircraft Subject: [FlyRotary] Re: where's the missing power? I dont have a regular manifold pressure gauge, just an industrial type vacu= um gauge ( I really gotta get an MP gauge). Anyway, the vacuum gauge was in= dicating 4" of vacuum. Where are you measuring the 4=94 vacuum? If it is near the ports it is no = unusual; if it is out before the runners; something is wrong. Al --_000_C03ABB0A7362B84BB53D544B3C305E0E015365470A4DEXVMBX0035e_ Content-Type: text/html; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable
Hi Mike= , FWIW I have the same cut-down (Mazda) throttle body as you do and a simil= ar looking intake - mine differs in that it sits ontop of the dynamic chamb= er and there is a RAM air scoop for cold air. When I first started running my engine, the top end static rpm was al= so limited, IIRC it was 5700 rpm; I did not repitch my ground-adjustable pr= op. I suspected that my ignition timing was not quite right, so I follwed t= he manaul setup supplied by Lynn and found the timing to be way off - after resetting it to 35 BTDC as per = the EC2 instructions the top end rpm was now 6130 rpm, with RD1C.
Jeff 
From: Rotary motors in aircraft [fl= yrotary@lancaironline.net] On Behalf Of Mike Wills [rv-4mike@cox.net]
Sent: Thursday, October 15, 2009 11:21 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: where's the missing power?

Sorry for my absence on a topic I= started. My nephew had a skateboarding accident last weekend and is in the= hospital in a chemically induced coma until his brain swelling is under co= ntrol. And I thought car powered airplanes were dangerous. Stay away from skateboards.
 
Tracy - My mixture monitor shows stoic= h at full throttle. I suspect an airflow issue rather than fuel.
 
Al - my vacuum gauge is located in the= plenum directly behind the throttle plates.
 
Lynn - I agree that the TB inlet is ho= rrible and needs a bell mouth. The inlet is also pretty obstructed by the c= owl which isnt visible in the pics I sent. I think I'll make an attempt to = clean this up some and see if it gets me anywhere. If not I'll live with it for a while.
 
Kelly - always tough to determine if t= he problem is an engine issue or if the load is simply too much for the eng= ine to overcome. I'm going to experiment with the shallow dive several have= suggested and see what happens.
 
Mike
----- Original Message -----
Sent: Tuesday, October 13, 2009 4:21= PM
Subject: [FlyRotary] Re: where's the= missing power?

Since you have the vacuum gauge, this article will he= lp you use it for troubleshooting.

 

 http://autospeed.com/cms/A_2393/article.html

 

Bill B

 

From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Al Gietzen
Sent: Tuesday, October 13, = 2009 7:22 PM
To: Rotary motors in aircra= ft
Subject: [FlyRotary] Re: wh= ere's the missing power?

I dont have a = regular manifold pressure gauge, just an industrial type vacuum gauge ( I r= eally gotta get an MP gauge). Anyway, the vacuum gauge was indicating 4" of vacuum.

 

Where are y= ou measuring the 4=94 vacuum?  If it is near the ports it is no unusua= l; if it is out before the runners; something is wrong.

 

Al

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