Mountain plane

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EzyBuildWing

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Joined
Sep 23, 2009
Messages
196
Location
Sydney NSW Australia
Dragonfly, but fit with with twin new Polini Thor 303 pushers..... around 600 lbs of static-thrust..... near vertical climb-out, and hover.... ultimate STOL !!!
Maybe trounce Steve Henry, and on a shoe-string budget!
 

jac

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Joined
May 18, 2013
Messages
78
Location
Gore, Southland New Zealand
With regard to cam failures, over the last decade or two with deletion of ZDDP etc from oils had much of the racecar industry scratching their heads. One simple fix has been to cut a small groove in the lifter bores to squirt a jet of oil at the cam lobe just before it comes into contact with the lifter face, a little difficult to arrange on those engines that use a lifter with a mushroom type head as that interferes with the oil jet, maybe a good reason for manufacturers to change to a non -mushroom style lifter. Most of the cars I now work on are older 60's/70's models and are used in a similar environment to the aircraft with lots of parked up time and so far the results have been no failures in the cam dept. Yes Im aware of other fix's like the EDM drilled lifters, but they dont seem to be bulletproof and when you think about it the oil discharge from them is not at the critical point needed on the cam lobe.
 

Dana

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Joined
Apr 3, 2007
Messages
9,779
Location
CT, USA
With regard to cam failures, over the last decade or two with deletion of ZDDP etc from oils had much of the racecar industry scratching their heads. One simple fix has been...
Or on any older engine, continue to run oils with zinc. I used Valvoline Racing Oil (contains ZDDP, marked for off road use only) in the Mosler (half VW) engine in my Fisher.
 

Pops

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Jan 1, 2013
Messages
9,003
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USA.
Or on any older engine, continue to run oils with zinc. I used Valvoline Racing Oil (contains ZDDP, marked for off road use only) in the Mosler (half VW) engine in my Fisher.
Can't buy any Valvoline Racing Oil in my local area. There is even a Race shop in town and they don't sell it.
 

Brünner

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HBA Supporter
Joined
Apr 12, 2020
Messages
118
Location
Beer country
I can attest to what's written there.
A small flight school near me has a 172N with that beast and the owner/operator has told me that he's been very happy with it (his own words). The plane flies very frequently, the engine receives a quart of oil before the first start up and gets warmed up for 5 minutes after that - or whenever it cooled down.
 
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