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  #1  
Old 03-14-2007, 11:50 AM
MCA's Avatar
MCA MCA is offline
 
Join Date: Jun 2005
Posts: 693
Post IO-390 Web Site

I've added some new info about the IO-390 installed on my -7. Have about 130 hours on the plane/engine now. Also some info on comparing a Whirlwind 200RV with a Hartzel 7497 BA prop.

www.IO-390.com

Marc
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Marc Ausman
RV-7 980 hours, IO-390, VP-X (sold)
RV-8 (flying a friend's)
Thinking about low and slow backcountry build.

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  #2  
Old 03-14-2007, 12:32 PM
rgbewley rgbewley is offline
 
Join Date: Nov 2005
Location: Tulsa, OK
Posts: 202
Default IO-390 Updates

Hey Marc:

Thanks for the updates on your site. Thought you might want to know that we are doing a baseline dyno test on a factory AEIO-390 this Friday for MT to use in some vibration analysis. Not sure when the information will be made available to the public, but I would think it should be soon.

Best,
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  #3  
Old 03-14-2007, 01:36 PM
Sid Lambert Sid Lambert is offline
 
Join Date: Jul 2005
Location: North Atlanta
Posts: 1,120
Default Why so slow?

Great looking airplane.

Why do you think your cruise numbers are 20 kts lower than the other guys?

I'm considering the IO-390 and it'd be nice to get some close numbers on a few aircraft to help compare cost/speed.
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RV-7 Sold
RV-4 - Flying - O-320 Fixed Pitch - Red over Yellow

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  #4  
Old 03-15-2007, 04:37 AM
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garnt.piper garnt.piper is offline
 
Join Date: Mar 2005
Location: Australia
Posts: 152
Default The Mighty 390!

How are the oil temps now Marc? Earlier on you were just marginal? I keep an eye on your 'site, I just ground ran my TMX-390 in the Giles G-200. I've gone with a 13-row oil cooler with it's own inlet duct. Hope to fly soon.

I'd like to know what MT come up with prop-wise for acro on a 390, I've fitted a WW200C to mine, and I ordered the engine without counterweights to save weight. The engine without couinterweights, starter ring gear, carb/FI, or vac pump drive weighed 286lb.
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SAAA #727 (TC)
RV-4 VH-PIO ~600hrs
G-200 VH-OVR ~250hrs
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  #5  
Old 03-16-2007, 01:00 PM
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MCA MCA is offline
 
Join Date: Jun 2005
Posts: 693
Default -390

I have no idea why the plane is slower than it should be. It's still great to fly, but I just don't have time these days to really track it down - nor am I an aero expert who knows what to look for. Going to try a few small mods in April when the next annual is due.

Oil temps are fine now. Usually around 180 -190 in cruise. Can get up to 230 in climb in the Summer. Overall it doesn't have to be managed very closely.

As far as comparisons go, I'm hoping to do a side-by-side speed run with another guy who has a -390 in a -7 as well. Will post that when it happens, probably later in the year.
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Marc Ausman
RV-7 980 hours, IO-390, VP-X (sold)
RV-8 (flying a friend's)
Thinking about low and slow backcountry build.

VAF Advertiser - Aircraft Wiring Guide
Book to help with experimental aircraft wiring.
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  #6  
Old 03-16-2007, 06:07 PM
scott7A scott7A is offline
 
Join Date: Oct 2006
Location: Anaheim, CA
Posts: 16
Default

How about a speed comparison with a -7A?

Scott
N653S
IO-390 RV-7A
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  #7  
Old 03-20-2007, 04:52 PM
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MCA MCA is offline
 
Join Date: Jun 2005
Posts: 693
Default

Let's do it! PM with your info and I'll look you up next trip to LA. Or vice versa...

Marc
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Marc Ausman
RV-7 980 hours, IO-390, VP-X (sold)
RV-8 (flying a friend's)
Thinking about low and slow backcountry build.

VAF Advertiser - Aircraft Wiring Guide
Book to help with experimental aircraft wiring.
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