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bobair8(at)msn.com
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 Posted: Wed Mar 11, 2009 5:51 pm Post subject: Converting IO-360 to O-360 |
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<?xml:namespace prefix="v" /><?xml:namespace prefix="o" /><![endif]--> For what it is worth, the GlaStar kit I bought partially completed came with an engine that started out as a Lyc IO-360-A1A and was converted by an overhaul shop to an O-360-"A1A". Because of the conversion, it is no longer a type certified engine and can only be used in experimental airplanes.
In addition to swapping out the fuel injection for a carburetor, it appears that they changed out higher compression pistons, which if memory serves are domed and produce about 8.7:1 compression to flat-topped pistons that provide 8.5:1 compression.
Why do it? Two reasons: the original owner was an older gentleman who wasn't familiar with fuel injection/was more comfortable with carbs and, more importantly, "bumps" would have had to be added to the cowling to provide sufficient clearance for the fuel injector tubes -- a lot of fiberglass work.
The engine was originally built in the mid-1960's and the log books are incomplete. But it has run strongly for the past ~170 hours. My best guess is that it puts out about 180 HP, which is plenty of power for my plane.
Best regards,
Bob
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Rhonda(at)bpaengines.com
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| Posted: Thu Mar 12, 2009 5:14 am Post subject: Converting IO-360 to O-360 |
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If they put 8.5:1 in it, that means they also changed the cylinders to parallel head taking it from 200 hp to 180 per your assumption. You cannot use the flat 8.5:1 piston in the angle head cylinder.
Rhonda Barrett-Bewley
From: owner-lycomingengines-list-server(at)matronics.com [mailto:owner-lycomingengines-list-server(at)matronics.com] On Behalf Of r falstad
Sent: Wednesday, March 11, 2009 8:51 PM
To: lycomingengines-list(at)matronics.com
Subject: Re: Converting IO-360 to O-360
For what it is worth, the GlaStar kit I bought partially completed came with an engine that started out as a Lyc IO-360-A1A and was converted by an overhaul shop to an O-360-"A1A". Because of the conversion, it is no longer a type certified engine and can only be used in experimental airplanes.
In addition to swapping out the fuel injection for a carburetor, it appears that they changed out higher compression pistons, which if memory serves are domed and produce about 8.7:1 compression to flat-topped pistons that provide 8.5:1 compression.
Why do it? Two reasons: the original owner was an older gentleman who wasn't familiar with fuel injection/was more comfortable with carbs and, more importantly, "bumps" would have had to be added to the cowling to provide sufficient clearance for the fuel injector tubes -- a lot of fiberglass work.
The engine was originally built in the mid-1960's and the log books are incomplete. But it has run strongly for the past ~170 hours. My best guess is that it puts out about 180 HP, which is plenty of power for my plane.
Best regards,
Bob
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