by Sean Griffin » 11 months ago
Tried to measure my return line restrictor/orifice this afternoon - its smaller than a 1mm drill bit. Will take some Oxy cleaning rods, on next visit - one will fit & I can get back to you with a more accurate dimension.
by Roger Lee » 11 months ago
Making the jet size too large could cause a bypass of too much fuel in certain circumstances. Why not leave well enough alone since it's been this way for decades and worked just fine. There needs to be safety margins in things we do and if you increase the jet size you may be on the edge of having a fuel issue when limits are reached.
Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-349-7056 Cell
by Jeff B » 11 months ago
Hi Roger,
Sean is not looking to increase the jet size. He is thinking his current return line orifice may be too large, creating a pressure drop under a full throttle climb. He is planning on reducing it to the specified #35 jet size (.35mm) if he finds that it is larger than that now.
by Roger Lee » 11 months ago
Ah, Okay.
The jet size should be stamped on the jet.
Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-349-7056 Cell
by Bill Hertzel » 11 months ago
The 912 ULS installation Manual mentions the "Integrated Orifice (Pilot Jet 35)" in Chapter 73-00-00, Page 11, Figure 7.6
Page 12 describes the Orifice as 0.5mm (0.0197")
Bill Hertzel
Rotax 912is
North Ridgeville, OH, USA
Clicking the "Thank You" is Always Appreciated by Everyone.
To receive critical-to-safety information on your ROTAX Engine, please subscribe to |
ROTALK NEWS Episode 5
Rotax-powered Sling aircraft from The Aircraft Factory, the AVMAP Navigation and engine monitoring system, and the Rotax powered Tucano Experimental and Light-Sport Aircraft.
ROTALK NEWS Episode 4
ROTAX's 915iS-powered Aquila A211 test aircraft, the Scheibe SF-25C Falke (first-ever 912-equipped aircraft!) and ROTAX factory in Gunskirchen, Austria.
ROTALK NEWS Episode 3
Michael Smith's Rotax-Powered Searey Circumnavigation, the amazing Rotax-Powered Lockwood Aircam and Anthony Caere's chimpanzee rescue operations.
This website uses cookies to manage authentication, navigation, and other functions. By using our website, you agree that we can place these types of cookies on your device.
You have declined cookies. This decision can be reversed.
You have allowed cookies to be placed on your computer. This decision can be reversed.
This website uses cookies to manage authentication, navigation, and other functions. By using our website, you agree that we can place these types of cookies on your device.