willydewey
Joined: 24 Sep 2014
Posts: 53
Location: Guildford Surrey United Kingdom
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 Posted: Tue Sep 12, 2017 6:02 am Post subject: VENTILATION IN FLIGHT & POSITIVE CABIN PRESSURE |
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I recently returned from a summer trip to Germany and Austria in G-IANI
wonderful trip but temperatures at 2000 ft rose in the cockpit to 44 deg C
and CO2 from the exhaust bothered me most of the time..
When on the ground the 914 was a problem to start probably by fuel being evaporated in the carbs and consequential vapour lock
I have the Standard NACA vents (broken but open) but these didnt work at all well. Ian gave me a Mecaplex vent which unfortunalty doesnt match the curve of the screen and maybe it would if fitted foul the locking handle.
During the winter months I would like to redress the situation and would be grateful for advice, in screen vents for example. Is it feasible to block or restrict the entrance where the flap drive enters the fuselage? If this is possible the CO2 problem might improve
Any help or tips much appreciated.
I do have the vapour return line installed back to the tank as required by the LAA and was recently checked and a logbook entry made.
Once started from cold the 914 ran faultlessly even in those high temperatures Both cylinder head and oil temperatures were within limits.
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