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paulmillner
Joined: 09 May 2007
Posts: 21
Location: Berkeley, California
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 Posted: Thu Mar 03, 2011 11:47 am Post subject: ROP to baby the engine? |
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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
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_________________
Paul Millner, Berkeley CA [OAK] |
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rvmills(at)sbcglobal.net
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| Posted: Thu Mar 03, 2011 12:43 pm Post subject: ROP to baby the engine? |
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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
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