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  #21  
Old 11-30-2014, 07:54 AM
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Nuisance Nuisance is offline
 
Join Date: Feb 2006
Location: Pagosa Springs, CO
Posts: 130
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So, what about a 540?

Where is John Harmon when we need him?

Seriously, I keep wondering about this. Seems like the perfect airframe, just like a Piper Dakota.
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  #22  
Old 12-21-2014, 05:47 PM
bbstanfield bbstanfield is offline
 
Join Date: Nov 2014
Location: Bandera, TX
Posts: 1
Default Engines & Fuel Options

Hello everyone. New to VAF. Flew demo RV-10 with Mitch Lock earlier this month. Is there any thought to fuel? Engine notwithstanding I see new fuel being tested and GA diesel piston engines coming on line. Looks like I'll be setting up for a RV-14 in two years. Makes me wonder about possible options out of Oregon. I'd hate to invest in a new plane only to change engines before it's economical.

Then again in another 20+ years I'll probably be too old anyway. I've not seen anything on this. Am I thinking too much or it already addressed?

Loved the RV-10 demo. Plane has smaller engine than kits and is far beyond my little C-150! Based on similarity I can see how a two seat RV-14 will be perfect for our needs. Not quite the same as jets but for my pocketbook and needs, hard to beat.

Not sure about tilt forward canopy, no baggage door, etc. but will take advantage in time. So far I see few items to kill it for us. Compared to factory birds, I like!
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  #23  
Old 12-21-2014, 06:58 PM
kamikaze kamikaze is offline
 
Join Date: Jun 2014
Location: Ottawa, ON, Canada
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The RV-14 is designed around the IO-390, which is 100LL only ... though if the fuel industry and the FAA do manage to come out with 100+ octane no-lead fuel replacement, you'll be OK.

Otherwise the experimental engine manufacturers will sell you something similar that will take mogas, such as the XP-400 with lower compression, I believe.

Not sure what might exist as far as diesel options for the -14 ... the CD-200 is likely too heavy ... the SMA it's based on is 430 pounds to the IO-390's 310 ...
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  #24  
Old 12-22-2014, 08:07 PM
Mike H Mike H is offline
 
Join Date: May 2014
Location: Savannah
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Quote:
Originally Posted by kamikaze View Post
The RV-14 is designed around the IO-390, which is 100LL only ... though if the fuel industry and the FAA do manage to come out with 100+ octane no-lead fuel replacement, you'll be OK.

Otherwise the experimental engine manufacturers will sell you something similar that will take mogas, such as the XP-400 with lower compression, I believe.

Not sure what might exist as far as diesel options for the -14 ... the CD-200 is likely too heavy ... the SMA it's based on is 430 pounds to the IO-390's 310 ...
If 100LL went away tomorrow without a suitable replacement you would be able to install lower compression pistons in you're IO-390 or angle valve IO-360 and burn Mogas. When lycoming was developing the IO-390 the marketing data and press releases stated that they would be making a Mogas compatible version that was to be rated at 190 HP. Prior to purchasing my engine I spoke with a Lycoming engineer on the phone for about a half hour and asked him about the Mogas version. He said they did not go into production of the Mogas compatibe version due to the power to weight ratio. He said it was more economical to purchase and install a parallel valve 180 or more HP engine that would weigh less than the derated IO-390, and because of this they did not see a market for the lower output version. I did ask him if the low compression Pistons were available and he said they were not currently, but that if a situation arose such as the discontinuation of 100LL then they may make them available, or many of the custom engine shops can make some suitable low compression Pistons.

I honestly don't see 100LL going away anytime soon and when it does there will be a suitable replacement. I am all for running Mogas, which I did almost exclusively in the two LSA aircraft I owned, but the reality is when you actually go somewhere with you're airplane the chances of you finding Mogas at an airport is slim to none and you will end up burning AvGas anyway.

I really thought long and hard regarding the 100LL fuel requirement of the IO-390 before deciding to build a -14A, but I decided that the extra cockpit room and the much improved landing gear of the -14 were a much larger advantage than being able to burn Mogas during local flights.
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  #25  
Old 12-23-2014, 06:39 AM
kamikaze kamikaze is offline
 
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Although I've had my doubts in the past, at this point I'm fairly confident we'll get a 100LL replacement as well ...

That's a good point about changing the cylinders ... I mean it's still a good chunk of change (Lycoming IO-390 cylinders are NOT cheap!), but it's an out should you need it. And indeed, if your IO-390 is experimental, you can put 3rd-party cylinders ... surely someone will want to fill that void were it to occur ...

Looking at my horizon for building, I might actually be able to hold off on an engine buy until 2018, assuming PAFI keeps to their schedule ... or at least we'll have a much better idea of where that stands ... same logic would apply to anyone in the planning stages of building a 14 ...
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  #26  
Old 12-23-2014, 08:13 AM
Mike H Mike H is offline
 
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Quote:
Originally Posted by kamikaze View Post
Although I've had my doubts in the past, at this point I'm fairly confident we'll get a 100LL replacement as well ...

That's a good point about changing the cylinders ... I mean it's still a good chunk of change (Lycoming IO-390 cylinders are NOT cheap!), but it's an out should you need it. And indeed, if your IO-390 is experimental, you can put 3rd-party cylinders ... surely someone will want to fill that void were it to occur ...

Looking at my horizon for building, I might actually be able to hold off on an engine buy until 2018, assuming PAFI keeps to their schedule ... or at least we'll have a much better idea of where that stands ... same logic would apply to anyone in the planning stages of building a 14 ...
You just need to change the Pistons to change the compression ratio, not the entire cylinder.
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  #27  
Old 12-23-2014, 12:14 PM
kamikaze kamikaze is offline
 
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Right, that makes more sense
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