---------------------------------------------------------- RV-List Digest Archive --- Total Messages Posted Thu 03/03/11: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 11:47 AM - ROP to baby the engine? (Paul Millner) 2. 12:43 PM - Re: ROP to baby the engine? (Bob Mills) ________________________________ Message 1 _____________________________________ Time: 11:47:30 AM PST US From: Paul Millner Subject: RV-List: ROP to baby the engine? I have 10:1 pistons, so I choose to run ROP and pay a little extra in fuel for the cooling (just one technique) Of course, that 50 ROP cylinder is running at the highest intracylinder pressure (ICP), so likely to be the hottest and most stressed. Paul ________________________________ Message 2 _____________________________________ Time: 12:43:35 PM PST US From: "Bob Mills" Subject: RE: RV-List: ROP to baby the engine? Paul, This technique is only used above 8-10K, and well below 75%. What you're saying is correct on ICP, so I watch closely at which altitudes/power settings I lean like this (mentioned in the previous post, apologies if I didn't state it clearly enough). I probably should undertake the GAMI program, so I can get them all at 100 ROP together when I'm running at power. Oh, and I didn't say I run ROP to baby the engine, I do it for additional cooling (the 50 ROP argument is noted though). I race this plane, and run the motor at high power a lot...but don't lean it there (at low altitudes at least). She's my baby, but she likes to run. I know the debate rages on LOP flying, and I have no issues with LOP operations whatsoever. I was just told not to do it in a 10:1 motor, so I eat the extra cost on gas and run ROP (mostly in the 100+ ROP range, per Deakin's recommendations). With a different motor, I'd be a LOP flyer too. Perhaps the caution on hi comp motors and LOP is unfounded, and I'm not trying to start a debate, but I'm just staying on the ROP side with this motor (and I do pay attention to the red zone!) :-) Cheers, Bob -----Original Message----- From: owner-rv-list-server@matronics.com [mailto:owner-rv-list-server@matronics.com] On Behalf Of Paul Millner Sent: Thursday, March 03, 2011 11:17 AM Subject: RV-List: ROP to baby the engine? I have 10:1 pistons, so I choose to run ROP and pay a little extra in fuel for the cooling (just one technique) Of course, that 50 ROP cylinder is running at the highest intracylinder pressure (ICP), so likely to be the hottest and most stressed. Paul ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message rv-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/RV-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/rv-list Browse Digests http://www.matronics.com/digest/rv-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.