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tmclam
Joined: 09 Sep 2010
Posts: 4
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 Posted: Mon Aug 15, 2011 7:36 am Post subject: DErating a 0 320? |
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With avgas racing to $10/gal ,i wonder if pulling a big Facet carb mess[Heat box,orange hose,mixture control,etc.] off a Lyc. O 320 and replacing it wih something like the Sonex 120 HP Aerocarb/Aerojet throttle body device and happily cruising at 135 IAS.Saving $20-$30/Hr would suit me fine.
Are there any Farmers out there that have tried this?Have at it guys.Knowing fuel prices will climb,yet i am amazed how fast it reached $7 in many areas.
To a cleaner lower cowl area
Ted .
[quote][b]
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sstearns2(at)yahoo.com
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| Posted: Mon Aug 15, 2011 9:28 pm Post subject: DErating a 0 320? |
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If it were me I would pull the cylinders and have the heads ported and install 10:1 compression pistons. You would end up with 185-190 HP peak and the engine would be significantly more efficient at cruise power.
Scott
From: "tmclam(at)comcast.net" <tmclam(at)comcast.net>
To: kis list <kis-list(at)matronics.com>
Sent: Monday, August 15, 2011 8:36 AM
Subject: DErating a 0 320?
#yiv1559547544 p {margin:0;}With avgas racing to $10/gal ,i wonder if pulling a big Facet carb mess[Heat box,orange hose,mixture control,etc.] off a Lyc. O 320 and replacing it wih something like the Sonex 120 HP Aerocarb/Aerojet throttle body device and happily cruising at 135 IAS.Saving $20-$30/Hr would suit me fine.
Are there any Farmers out there that have tried this?Have at it guys.Knowing fuel prices will climb,yet i am amazed how fast it reached $7 in many areas.
To a cleaner lower cowl area
Ted .
[quote]IS-List" rel="nofollow" target="_blank">http://www.matronics.com/Naviganics.com" rel="nofollow" target="_blank">http://forums.matronics.com[/b][b]
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mantafs(at)earthlink.net
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| Posted: Tue Aug 16, 2011 4:52 am Post subject: DErating a 0 320? |
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Hi Ted,
I agree with Scott. Higher compression and porting will not only give you more peak power (not that you are interested in more power) but also help efficiency. I would also ceramic coated the piston tops, ceramic coat the ports and low friction coat the piston sides. On top of this I would also go to an electronic ignition. I think you will see a much bigger change in efficiency with this than with just changing from one type of carb to another type of carb. Even just going to the electronic ignition will produce a bigger fuel savings than changing the carb type. Real port fuel injection would be better but is expensive.
Keep in mind that you can always throttle back with any carb.
Mark
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richard_trickel(at)yahoo.
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| Posted: Tue Aug 16, 2011 10:12 am Post subject: DErating a 0 320? |
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Ted
I agree with Scott and Mark except one item. Anything you do wil cost money. Is this money spent wisely? Are you doing a rebuild anyway. How much do you fly in a year. Say you fly 100 hours and your fuel savings is $1 per hour.. It would take 2000 hours to recoupe the 2000 dollar mod. Throttle back for tool around the patch and have fun flying without the fus and down time
Rich
--- On Tue, 8/16/11, Mark Kettering <mantafs(at)earthlink.net> wrote:
[quote]
From: Mark Kettering <mantafs(at)earthlink.net>
Subject: Re: DErating a 0 320?
To: kis-list(at)matronics.com
Date: Tuesday, August 16, 2011, 12:52 PM
--> KIS-List message posted by: Mark Kettering <mantafs(at)earthlink.net (mantafs(at)earthlink.net)>
Hi Ted,
I agree with Scott. Higher compression and porting will not only give you more peak power (not that you are interested in more power) but also help efficiency. I would also ceramic coated the piston tops, ceramic coat the ports and low friction coat the piston sides. On top of this I would also go to an electronic ignition. I think you will see a much bigger change in efficiency with this than with just changing from one type of carb to another type of carb. Even just going to the electronic ignition will produce a bigger fuel savings than changing the carb type. Real port fuel injection would be better but is expensive.
Keep in mind that you can always throttle back with any carb.
Mark
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sstearns2(at)yahoo.com
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| Posted: Tue Aug 16, 2011 3:31 pm Post subject: DErating a 0 320? |
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I think for about $2000 net of selling the parts you could go to 10:1 pistons, port the heads and go to dual Emags assuming your comfortable doing the work yourself. Some mechanics will supervise your work for a reasonable cost which is the way i would go with my current skill set.
I bet you would save about 1 gal per hour in cruise and have a 20-30 HP reserve above the normal rating at sea level. I normally do not run above 25 inches which keeps the engine at or below its rated power. I run lean of peak with my 360 with this set up, but only at less than 20 inches of MP which is wide open at 10,000 feet or above. I get 170 KTAS at 8 gallons per hour at 10000 feet, even a bit better at 13500.
Like Rich said you have to balance the cost and benefit. You save gas but also add value and performance to the airplane. I really think a used 320 or 540 with these mods is the best value for a light airplane engine.
Scott
Sent from my iPad
On Aug 16, 2011, at 5:52 AM, Mark Kettering <mantafs(at)earthlink.net> wrote:
[quote]
Hi Ted,
I agree with Scott. Higher compression and porting will not only give you more peak power (not that you are interested in more power) but also help efficiency. I would also ceramic coated the piston tops, ceramic coat the ports and low friction coat the piston sides. On top of this I would also go to an electronic ignition. I think you will see a much bigger change in efficiency with this than with just changing from one type of carb to another type of carb. Even just going to the electronic ignition will produce a bigger fuel savings than changing the carb type. Real port fuel injection would be better but is expensive.
Keep in mind that you can always throttle back with any carb.
Mark
--
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