Yup, 912iS also has a WOT setting with a spring should the cable/connection fail.
Yup, 912iS also has a WOT setting with a spring should the cable/connection fail.
Eddie Forward
Flying
SS7, 912iS, Garmin G3X
Thanks, Eddie, I didn't know the iS had a spring.
I'll be getting this throttle very soon. I'll be needing to pick a bunch of your brains.
I have the Mcfarlane throttle 2 cable setup on my 912 and it is smooth and works good ,But I had to go to allot lighter springs on the carbs.I just could not land the plane and work the flapperons at the same time.if you loosen off the friction so that you can control the RPM during landing then you can't let go of the throttle to work the flapperons without the springs pulling it to full throttle.
I went with the lightest springs that would pull the carb to full throttle with the cable Disconnected [which simulates a broken throttle cable].
I found that the Mcfarlane throttle Cables are stiff enough that they can push and pull the throttle without the aid of springs,but I put the light spring on for safety. My carbs stayed balanced with the lighter springs.
I love my McFarlane cable. It only takes light finger pressure to control the locking mechanism. I got rid of the springs. My carbs stay balanced and I just don't have any problems with the springs gone.
Friend had an SLSA from Kitfox (no McFarlane cable) and it came with no springs on the carbs. So, decided to try it on my airplane.
Love having vernier control on approach to landing. On mine, I can keep light tension on the locking mechanism, so I can either push/pull easily or use the vernier - which ever is most needed at the time.
This setup is so much better than the original.
Regards
Rodney
No ,I went with springs that I bought from Lordco automotive store,but last week as the temps started to be cold in the mornings I started having problems with it running rough on startup at idle.Put the carb mate to check carb balance and found that the springs were letting a tiny movement of the throttle arm at idle and I could not get it to balance at idle but balance was perfect above idol all the way to full power.Finally had to put the heavy springs back on to get it back in balance at idle and above.I hate the heavy springs though.
I would be suspicious that the throttle spring tension has ANYTHING to do with carb balance. Unless you have worn out carburetor linkage, the springs don't contribute to balance other than to seat both carbs on their respective stops.
Your Comment about the colder weather has implications though. When its cold, many pilots close the gap on the spark plugs to the minimum gap. This gives a nice solid spark and helps the "fire" burn immediately on those cold winter days.
Movement on the carburetor arm at idle would indicate loose linkage. could you send a close up pic of the carbs set up? I want to see the cockpit throttle position at idle and the carburetor arms at rest and under tension.
P.M. me if you cant upload the pics and I"ll get you my email.