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12-05-2013, 04:28 PM
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Join Date: Dec 2011
Location: North Carolina
Posts: 94
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Quote:
Originally Posted by RVbySDI
yes, the fuel is really forward of CG. Everything stays within CG range until it gets down to 2 gallons. Anything 2 or less with a fully loaded plane pushes past the aft limit.
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Thanks Steve thats good info. thats what I was thinking just claryifing.
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12-05-2013, 05:32 PM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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If you are making the (I)O-320, 340, or 360 decision on a blank piece of paper (Meaning you didn't already own an O-320.), here are a few items to consider. (and the thought process I went through a few years ago.)
The -320 is a great engine and the thing we RV builders forget is that is was designed as an engine for a four place draggy plane like a C-172. When fitted to a light and clean airframe like an RV, it will provide amazing performance!
The (I)O-340 stroker kit that ECi sells is based on a certified engine and was an intermediate step while Lycoming developed the (I)O-360. As soon as the -360 came out, the -340 was dropped. Should ECi go out of business, 340 support will go with them. Also, the -340 is the most expensive of the three engines discussed here.
The (I)O-360 is only a few pounds heavier than an O-320 and is slightly more expensive but produces 11% more power.
Here is the spreadsheet I put together back when I had to replace my original engine. All the numbers, other than price, came from ECi, and the prices are from 2009.
..............O-320..........O-340.....................O-360
...........(CR 8.5:1)....(CR 8.3:1)....Delta....(CR 8.5:1)....Delta
Price......$15,900........$16,500.......4%.......$ 16,400........3%
HP...........164...............174..........6%.... ......185..........11%
Weight.....240...............240..........0%...... ....244............2%
in Lbs
__________________
Bill R.
RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
SC86 - Easley, SC
www.repucci.com/bill/baf.html
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12-06-2013, 10:48 AM
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Join Date: Aug 2005
Location: Pasadena CA
Posts: 2,484
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But since the 340 is based off the 320, just with a different crank/rod set, if ECI goes out of business and for some reason you need a crank, you can put a 320 crank right back in. All the other parts are pretty much stock Lyclone parts, including 320 pistons.
I'm a fan of the idea, may or may not make it in my airplane, but its a good one.
__________________
Stephen Samuelian, CFII, A&P IA, CTO
RV4 wing in Jig @ KPOC
RV7 emp built
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12-06-2013, 11:04 AM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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Quote:
Originally Posted by osxuser
But since the 340 is based off the 320, just with a different crank/rod set, if ECI goes out of business and for some reason you need a crank, you can put a 320 crank right back in. All the other parts are pretty much stock Lyclone parts, including 320 pistons.
I'm a fan of the idea, may or may not make it in my airplane, but its a good one.
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Yes, that is true, but you will also have to replace your prop, (adjust/replace?) your carb/FI, and redo your flight testing while you put it back into Phase 1 for five hours.
Not the end of the world but still a consideration.
__________________
Bill R.
RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
SC86 - Easley, SC
www.repucci.com/bill/baf.html
Last edited by N941WR : 12-06-2013 at 11:08 AM.
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