Update notes to 2014 manual, 1100 – Camshaft group

Builders,

If you are the owner of a 2014 conversion manual, below are some short notes on the 1100 – Camshaft group section. I have written about these details in the last 3 years, but they are presented here in summary form, please update your manuals and notebooks accordingly:

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2017 commentary:

In the last 3 years we have sold about 150 “1100-WW cam kits”, (Group 1100 cam kits on shelf.) they also went into every complete motor I built and into all of the Weseman’s “EIB” (engine in a box) kit engines. Buying one of these gets you every part from Group 1100, but it also makes sure your thrust washer on the cam is tight. In the last 3 years I have had 7 or 8 builders come to a college thinking that I was going to be OK with them assembling a motor with a wobbly thrust washer. They were not correct. Engines at Colleges and events I host,are assembled to my standards, because it is important to make things better, not good enough.

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http://shop.flycorvair.com/product/1100-cam-shaft-kit/ is the link to the products page.

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1101- an OT-10 is still a good cam, and it works, but our dyno testing in 2016 at a professional shop confirmed that our 1100 cam was a slight edge in an aircraft motor.

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1102- in 2014, I had some tolerance for thrust washers which rotated on cams. In the time since, I have concluded that since we know how to make them tight, and they undoubtedly left the factory tight, we should always make them so now. If they are tight, it precludes any conversation about “how loose is too loose?” which is exactly what I don’t like as an attitude about building engines.

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1103- no change

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1104- Clark’s standard gears are still acceptable for use, and their timing marks remain consistently accurate. Their “fail Safe” gears were once made in the US and were billets, but they are not made here now, and they are no longer from billet material. They still work, but I pushed about 10 off cams with loose washers in the last 3 years, and they don’t grab a cam much tighter than a stock replacement gear, and they are apparently made of the same material. My preferred cam gear is the California Corvairs US made billet gear.

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1105- Some HT-817s are now made in Mexico. I have seen no quality difference, but to stay with American products our 1100ww cam kits come with Summit Racing lifters, which are made in the US.

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1106- no change

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1107- no change

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Thank you, wewjr.

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About William Wynne
I have been continuously building, testing and flying Corvair engines since 1989. Information, parts and components that we developed and tested are now flying on several hundred Corvair powered aircraft. I earned a Bachelor of Science in Professional Aeronautics and an A&P license from Embry-Riddle Aeronautical University, and have a proven 20 year track record of effectively teaching homebuilders how to create and fly their own Corvair powered planes. Much of this is chronicled at www.FlyCorvair.com and in more than 50 magazine articles.

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