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dpfisher(at)scottsbluff.n
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 Posted: Tue Dec 26, 2006 9:55 pm Post subject: A Series Continentals |
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What is an A-80-8? Is it an A65 converted to 80hp?
Hi Steve,
Yes. An A-80-8 is an 80 HP brother of the A-65. They share most of the
same parts. The key differences are: high compression pistons and extra
oil holes in the rod caps, and the 80 HP engine develops its rated
horsepower at a higher RPM than the A-65. In addition you may also need a
larger carb venturi and a larger load jet. In my case, my field elevation
is 4000 ft. and engine performance degrades about 4% per 1000 ft. so all
my horses are Shetland Ponies and my 80 HP engine will only develop 67 HP
at 4000 ft. With this in mind , I made the venturi larger, ( 1 5/16 in.
), but used the standard A-65 load jet.
The conversion is not difficult. Just get a copy of the old original
Continental Parts/Repair manual. It calls out the differences between the
engines. I also balanced, ported, polished and blueprinted my
engine. Balancing is a good thing to do as you'll be running at a higher
RPM, but smoothing out the intake system may have been
counterproductive. According to Archie on the engines list, the 0-200 has
intake passages that are so large that they lose beneficial turbulance. I
assume the same may be true of the A-65 and A-80. Anything you can do to
clean up the exhaust system would of course be beneficial.
You may also need a different prop to get the most from the 80 HP engine.
Have fun!
Dave, 701 with A-80-8 Continental, 90% and holding!
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marinegunner(at)gmail.com
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| Posted: Wed Dec 27, 2006 6:01 am Post subject: A Series Continentals |
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Dave,
Thanks, I have the orig. continental repair/parts manual. Will study it this week. If the job is as easy as you say, I may change the engine before DAR time. If it appears that it will take me to long to get done (I am slow), I will get the airworthiness inspection done, fly off the airplane and then change the engine. We are at 2,600' +/-. The A-65 appears to be good for this airplane. I cannot hold the airplane with full throttle - unless it is tied down. Wants to "skip" on the pavement with the brakes held tight. That is at 2200 rpm. Gonna re-check/adjust the brakes tomorrow morning and see if anything changes.
--
Semper Fi,
Steven R. Hulland
CH 600 Taildragger
Amado, AZ
This and all other incoming/outgoing email, attachments and replies scanned prior to opening/sending and uses an external firewall to help insure virus free email and attachments.
[quote][b]
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kmccune
Joined: 22 Sep 2007
Posts: 577
Location: Wisconsin, USA
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| Posted: Tue Aug 25, 2009 3:21 am Post subject: Re: A Series Continentals |
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Any updates ?
Kevin
| dpfisher(at)scottsbluff.n wrote: | What is an A-80-8? Is it an A65 converted to 80hp?
Hi Steve,
Yes. An A-80-8 is an 80 HP brother of the A-65. They share most of the
same parts. The key differences are: high compression pistons and extra
oil holes in the rod caps, and the 80 HP engine develops its rated
horsepower at a higher RPM than the A-65. In addition you may also need a
larger carb venturi and a larger load jet. In my case, my field elevation
is 4000 ft. and engine performance degrades about 4% per 1000 ft. so all
my horses are Shetland Ponies and my 80 HP engine will only develop 67 HP
at 4000 ft. With this in mind , I made the venturi larger, ( 1 5/16 in.
), but used the standard A-65 load jet.
The conversion is not difficult. Just get a copy of the old original
Continental Parts/Repair manual. It calls out the differences between the
engines. I also balanced, ported, polished and blueprinted my
engine. Balancing is a good thing to do as you'll be running at a higher
RPM, but smoothing out the intake system may have been
counterproductive. According to Archie on the engines list, the 0-200 has
intake passages that are so large that they lose beneficial turbulance. I
assume the same may be true of the A-65 and A-80. Anything you can do to
clean up the exhaust system would of course be beneficial.
You may also need a different prop to get the most from the 80 HP engine.
Have fun!
Dave, 701 with A-80-8 Continental, 90% and holding! |
| | - The Matronics Zenith-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Zenith-List |
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