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riffelj
Joined: 20 Apr 2009
Posts: 14
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 Posted: Fri Jan 29, 2010 8:15 am Post subject: Input Needed on Engine Selection: 0-320 vs. 0-360?, which mo |
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Brett,
I initially planned to install an O-360 in my RV7A because I'd flown behind them in my two previous airplanes and been happy with them.
After talking to a lot of folks, I changed my mind and went with an IO-360 w/ a constant speed prop. Yes it cost more - but this was the only plane I was ever going to build. While the RV6/7 flys fine on a 320 (a friend has one - and he wishes he'd gone w/ a 360), most have 360s. When you fly with other RVs (and you will), you'll have difficulty keeping up w/ a 320. And when you (or your family) sells, it'll be more difficult with a 320.
With an IO you'll get better fuel distribution and (maybe) more even CHTs. With a reasonable EIS (a MUST HAVE - mine's a Grand Rapids 4000), you'll be able to fly Lean Of Peak - which I understand is not recommended with just carburation. My RV7A will cruise 160+kts at about 8.5-9 gph. I haven't ran the numbers, but I'd guess being able to run LOP over a couple years will pay back the IO up-cost in fuel savings.
I shopped for engines/props - a LOT. I chose AeroSport http://www.aerosportpower.com/prices.htm#NewEngines after a friend mentioned them - and I talked w/ Bart and Sue at OSH. Ask around - they KNOW their stuff and their reputation is Very Good. Their prices are more than competitive - but most of all, their warranty is better than Vans/Matt./Lyc./etc. (it starts with 1st flight - not some period after the engine ships). They did what they promised - and were more than helpful thru the install (They no-charge shipped an extra throttle lever when I had cowl clearance issues and worked thru some fuel injection servo re-plumbing as well as my ECI cylinder recall).
I chose 2 PMags with the automotive plugs option after a lot of shopping - and I'm delighted with the choice. (they've been flawless; checkout the cost of plugs! - and timing takes 2 minutes!). AeroSport adjusted the price since I wasn't using the included mags. I recommend that you Stay Away from vacuum pumps!
As you know, making choices is the most difficult part of building (other than coming up with the $$s). I've re-done some of the choices I made along the way - everyone does. But it's REAL expensive to change your mind on the engine/prop. Choose wisely.
Good Luck - and keep plugging.
"Jerry" Riffel
RV7A: 120+ hrs
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aerobubba(at)earthlink.ne
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| Posted: Sat Jan 30, 2010 9:43 pm Post subject: Input Needed on Engine Selection: 0-320 vs. 0-360?, which mo |
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Howdy-
You might consider one of Bart's O/IO 375's. It has the same footprint as
an IO-360, but you can get 195 hp out of it with car gas or another 10 or
15 hp (I forget which) if you go higher compression and 100LL.
The way he flow matches the injectors, one should be able to operate the IO
version significantly leaner than with a typical carb installation. The IO
would also allow sustained inverted flight, for those who like that sort of
thing 
Just one more data point
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