stunthanger.com
Engine basics => Engine set up tips => Topic started by: James Holford on April 08, 2017, 06:34:39 PM
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Received this nice Torp .29 today. Excellent compression.
But what is that hole on the backplate?
(https://uploads.tapatalk-cdn.com/20170409/cff27d0e185cd806290222028657ca0c.jpg)
(https://uploads.tapatalk-cdn.com/20170409/154522856377166cc207fb2296a50911.jpg)
Sent from my SAMSUNG-SM-G891A using Tapatalk
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With my very limited knowledge in this old engine stuff, I would like to believe a fuel tank of some sort? Just a guess.
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So I just saw badbill's for sale post. It is NOT the same engine, but has what I thought attached?
http://stunthanger.com/smf/classifieds-92/for-sale-1947-torpedo-special-29/
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Should be threaded to take a fuel tank mounting screw, relief around edge would take a thin paper gasket that the tank edge sealed against. Looks like bolts were changed out to 4-40 to take self locking nuts.
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We use to drill a hole through the backplate and add a pressure tap for combat flying. It worked vey well. Easy to plug up when not using it. The 29-32 were good combat motors in there day.
Ed
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Jamie, I will send ya a P /M
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In the '50s, we ran the K&B 29 on pressure. As I remember, drill a #80 hole through the threaded tank mount. I found a "universal" needle valve with the proper threads to fit the backplate threads.
Used for stunt, with all tank vents closed. It's curious that it works, because crankcase pressure goes negative then positive each cycle. I guess there is a net positive pressure, which keeps the tank at a slightly positive pressure.