---------------------------------------------------------- Commander-List Digest Archive --- Total Messages Posted Mon 08/25/03: 6 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 11:52 AM - IGSO 540 B1A QUESTION (MOEMILLS@aol.com) 2. 02:25 PM - Re: IGSO 540 B1A QUESTION (Jerry Sprayberry) 3. 03:04 PM - Re: IGSO 540 B1A QUESTION (MOEMILLS@aol.com) 4. 05:18 PM - Re: IGSO 540 B1A QUESTION (CloudCraft@aol.com) 5. 05:35 PM - Re: IGSO 540 B1A QUESTION (css nico) 6. 05:36 PM - Re: IGSO 540 B1A QUESTION (MOEMILLS@aol.com) ________________________________ Message 1 _____________________________________ Time: 11:52:11 AM PST US From: MOEMILLS@aol.com Subject: Commander-List: IGSO 540 B1A QUESTION --> Commander-List message posted by: MOEMILLS@aol.com Fellow Commander drivers, If the sheet metal plate which is brazed onto the rocker covers comes loose and the intake rocker shaft comes out of its' stanchions the intake valve will no longer open. Obviously, that cylinder will not fire and the engine will run extremely rough as that cylinder is also getting two compression strokes in the four cycles. My questions is this: Should the engine go extremely rich with black smoke blowing out of the exhaust. This has happened to me two times. After having worked in the racing engine industry for 37 years I have a relatively good understanding of engines and I can't understand why the engine goes dead rich (even with the Simmonds pump). Also, the manifold pressure goes low which is understandable because the engine is so rich. Any help that anyone could give me in understanding this phenomenon would be greatly appreciated. Moe Mills N680RR ________________________________ Message 2 _____________________________________ Time: 02:25:49 PM PST US From: "Jerry Sprayberry" Subject: Re: Commander-List: IGSO 540 B1A QUESTION --> Commander-List message posted by: "Jerry Sprayberry" The Simmonds Fuel Control is Controlled by Oil Pressure, Has a little oil screen that has to be checked often. CloudCraft can tell us all, exactly how it works, Where are you Kieth? Are you coming to the Flyin? Jerry Sprayberry ----- Original Message ----- From: Subject: Commander-List: IGSO 540 B1A QUESTION > --> Commander-List message posted by: MOEMILLS@aol.com > > Fellow Commander drivers, > > If the sheet metal plate which is brazed onto the rocker covers comes loose > and the intake rocker shaft comes out of its' stanchions the intake valve will > no longer open. Obviously, that cylinder will not fire and the engine will > run extremely rough as that cylinder is also getting two compression strokes in > the four cycles. > > My questions is this: Should the engine go extremely rich with black smoke > blowing out of the exhaust. This has happened to me two times. After having > worked in the racing engine industry for 37 years I have a relatively good > understanding of engines and I can't understand why the engine goes dead rich (even > with the Simmonds pump). Also, the manifold pressure goes low which is > understandable because the engine is so rich. > > Any help that anyone could give me in understanding this phenomenon would be > greatly appreciated. > > Moe Mills > N680RR > > ________________________________ Message 3 _____________________________________ Time: 03:04:24 PM PST US From: MOEMILLS@aol.com Subject: Re: Commander-List: IGSO 540 B1A QUESTION --> Commander-List message posted by: MOEMILLS@aol.com Thanks, however, am familiar with the full rich condition when the oil pressure goes down, however, in this situation as soon as the intake rocker shaft is replaced and the intake valve opens properly again the fuel mixture goes back to normal. Moe ________________________________ Message 4 _____________________________________ Time: 05:18:18 PM PST US From: CloudCraft@aol.com Subject: Re: Commander-List: IGSO 540 B1A QUESTION --> Commander-List message posted by: CloudCraft@aol.com In a message dated 08/25/03 11:53:10 Pacific Daylight Time, MOEMILLS@aol.com writes: > If the sheet metal plate which is brazed onto the rocker covers comes loose > > and the intake rocker shaft comes out of its' stanchions the intake valve > will > no longer open. Obviously, that cylinder will not fire and the engine will > run extremely rough as that cylinder is also getting two compression strokes > in > the four cycles. > > My questions is this: Should the engine go extremely rich with black smoke > blowing out of the exhaust. Moe, This is a W.A.G., but since the IGSO-540 is a single point injection at the supercharger and in your scenario, one cylinder is not completing an intake stroke, it may be that an extra rich mixture is forming in the manifold. This mixture -- richer by "one cylinder's worth" is what could be causing the fogging and MAP drop. What happens if you manually lean at idle? Does it clean up? Really -- I've never come across this before -- a rich mixture NOT caused by an oil pressure problem and/or Simmonds problem. Captain Spray: Right now looks like I'll be working over that weekend of the Fly-In. We've hired a new copilot which would normally mean more free time for me, but he's fresh out of training and the All Mighty Chief Pilot as put me with him on all the up comming trips so I can give him his I.O.E. That's what I get for being the company I.O.E. guy. No rest for the wicked. My regrets to all; I would have enjoyed meeting some of the new members, seeing old members and my dear friends at Commander-Aero. Wing Commander Gordon. ________________________________ Message 5 _____________________________________ Time: 05:35:53 PM PST US From: "css nico" Subject: Re: Commander-List: IGSO 540 B1A QUESTION --> Commander-List message posted by: "css nico" But then again the pure of heart doesn't need rest, Chief. Nico ----- Original Message ----- From: Subject: Re: Commander-List: IGSO 540 B1A QUESTION > --> Commander-List message posted by: CloudCraft@aol.com > > In a message dated 08/25/03 11:53:10 Pacific Daylight Time, MOEMILLS@aol.com > writes: > > > If the sheet metal plate which is brazed onto the rocker covers comes loose > > > > and the intake rocker shaft comes out of its' stanchions the intake valve > > will > > no longer open. Obviously, that cylinder will not fire and the engine will > > run extremely rough as that cylinder is also getting two compression strokes > > in > > the four cycles. > > > > My questions is this: Should the engine go extremely rich with black smoke > > blowing out of the exhaust. > > Moe, > > This is a W.A.G., but since the IGSO-540 is a single point injection at the > supercharger and in your scenario, one cylinder is not completing an intake > stroke, it may be that an extra rich mixture is forming in the manifold. > > This mixture -- richer by "one cylinder's worth" is what could be causing the > fogging and MAP drop. > > What happens if you manually lean at idle? Does it clean up? > > Really -- I've never come across this before -- a rich mixture NOT caused by > an oil pressure problem and/or Simmonds problem. > > Captain Spray: Right now looks like I'll be working over that weekend of the > Fly-In. We've hired a new copilot which would normally mean more free time > for me, but he's fresh out of training and the All Mighty Chief Pilot as put me > with him on all the up comming trips so I can give him his I.O.E. > > That's what I get for being the company I.O.E. guy. No rest for the wicked. > > > My regrets to all; I would have enjoyed meeting some of the new members, > seeing old members and my dear friends at Commander-Aero. > > Wing Commander Gordon. > > ________________________________ Message 6 _____________________________________ Time: 05:36:16 PM PST US From: MOEMILLS@aol.com Subject: Re: Commander-List: IGSO 540 B1A QUESTION --> Commander-List message posted by: MOEMILLS@aol.com Wing Commander Gordon: Thank you for your valued advice. My thought was that the cylinder with the inoperable intake valve also was not using the boost from the mechanically driven supercharger, therefore, the air/fuel mixture should remain approximately the same. Best regards, Moe N680RR