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Minimum Idle RPM

D

DanP

MEMBER
Hudson, MA
I notice my idle RPM is a little high-- slightly over 800-- after replacing the carb. My mechanic is doing some final tweaks and was going to adjust that. I believe somewhere around 650 is about the minimum but wanted to confirm that that is what I should see.
 
Dan, We use 600-650 on wheels. I used to set mine as low as possible 450 - 500 when on floats to minimize idle thrust. 800 will almost keep a light super cub in the air! :lol:

sj
 
Yeah-- that is sort of what is happening to me! I settle down into ground effect and float for about 300 feet.

On the ground, I am having to ride the brakes while taxiing.
 
My stroker in my J4 will idle slow enough that the impulse will clatter. Idle below 500 rpm make a huge difference in landing distance. My yellow cub with the composite prop won't idle as low

Glenn
 
cubdriver2 said:
If it's too low it won't quit on final, it will quit as you touch down. But we all fly a safe height to touch down, right ;- )

Glenn
Click to expand...


Well, "as you touch down" is still "short" final I guess......... ;-) Not much of a problem with a SC or even a J3 but a real PIA in the J5A to be stuck in the middle of the runway w/o starter.....with a &^%^# Lear Jet benind you. BT/DT
 
n40ff said:
Well, "as you touch down" is still "short" final I guess......... ;-) Not much of a problem with a SC or even a J3 but a real PIA in the J5A to be stuck in the middle of the runway w/o starter.....with a &^%^# Lear Jet benind you. BT/DT
Click to expand...

Mine doesn't quit

Glenn
 
Mine is set about 500. I sometimes get that mag rattle. What is that, and does it cause any problems?

Jim
 
I turned mine up to 600-650. It had an unnerving tendency to quit when I closed the throttle on an mild uphill landing if I had the mixture a little lean.
 
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