|
Mike, a couple of points, first: if you are even considering a IO-360 you are building an older ES not the newer super ES correct? I mention this since the Super uses a 540 Continental 6 cylinder. Second: The Conti 6 or a lyc O or IO 540 weigh around 500# ready to operate. Those numbers are from the Lycoming web site and may be a bit optimistic. I would say at LEAST 500# for a 6 cylinder. So the 20B is still 50-90# lighter! The IO 360 weighs between 400-450# depending on configuration. A clean 13B setup and a IO-360 FWF are about equal in weight.
Bill Jepson
-----Original Message-----
From: ALVentures@cox.net
To: flyrotary@lancaironline.net
Sent: Wed, 7 Mar 2007 7:45 AM
Subject: [FlyRotary] Re: 20b vs. Renesis for Lancair ES?
So we have a data point.
20B FWF w/o prop ~425#
How much does a IO-360 weigh w/o prop, including fluids & radiators?
When comparing weights for liquid cooled you need to include the coolant and radiators, because the IO-360 needs neither. In both cases you generally do not include the oil. My estimates are that the IO-360 on a comparable FWF basis would be 40# less. But for the same power, you should compare to 265hp IO-540; which will be more than 425#.
Keeping the 20B installation down to 425# required custom lightweight induction, exhaust, oil pan, etc.
Al
How much does a 12b weigh w/o prop, including turbo/supercharger, fluids & radiators?
Mike LaFleur (dithering between 13b & 20b)
Al G dynoed his 20B at 295 hp @ 6800 RPM if I remember correctly. (might have been 285) Al chime in if you see this. The 20B is 50% bigger. (or 1/3 if you prefer) The engine simply doesn't have to be as highly stressed to produce power. For the ES GET THE 20B.
You remember quite correctly; 290 @6800 (sea level, std day, and all that). More important to me with 2.17 : 1 re-drive, it’s about 265 hp at 6300 (2900 at the prop), and 200 at an easy cruise rpm of 4800. That engine should go many hours at those conditions. If you want more horses, go with 2.85:1 re-drive.
All up FWF weight (w/o prop) is about 425# including coolant and radiators.
I have no first hand experience with the Renesis; but for an ES, I’d go with the 20B.
Al
|