Anyone use Vernier Control for Carb Ht?

[bjustus]

My RV-4 carb heat works back off partly due to ram air pressure against the door. My first -4 did the same thing. Has anyone used a vernier control for carb heat to stop this, or any other ideas?

Thanks,

- Brett

[dan]

Van's sells a relatively cheap control knob/cable that is "detented" if you will. Is that the one you're using already?

http://www.vansaircraft.com/cgi-bin/...product=bowden

Just thinking about light & simple solutions, alternatives to heavier & more expen$ive parts.

[petehowell]

I had the same issue and went to a button lock cable. It works great. Install required a slightly larger hole in the panel.

Button lock

[Chino Tom]

I agree with the button lock. No issues for 9 years.

[bjustus]

Originally Posted by dan

Van's sells a relatively cheap control knob/cable that is "detented" if you will. Is that the one you're using already?

http://www.vansaircraft.com/cgi-bin/...product=bowden

Just thinking about light & simple solutions, alternatives to heavier & more expen$ive parts.

What I have has little rings that you can hear rubbing as it is pulled in and out but just not enough friction to override the airflow against the air door.

Is that what this one does or is there one specific detent point that you set or engage somehow?

Definitely appreciate the help including the time you and Pete took to look up the links and post your suggested solutions!

[RV8N]

I've always heard that carb heat should either full on or full off. Maybe we should talk about reasons to use only partial carb heat?

Karl

[gasman]

THIS WORKS GREAT...... http://www.aircraftspruce.com/catalo...ledashctrl.php
AND YOU CAN CHANGE THE KNOB. IT HAS A 1/4" SHANK WITH A ALLEN SET SCREW.

YOU CAN ALSO GET THIS AT NAPA AUTO PARTS.

[Ron Lee]

I don't often use carb heat so I was wondering why the knob went in. I never considered air pressure.

[LifeofReiley]

Originally Posted by RV8N

I've always heard that carb heat should either full on or full off. Maybe we should talk about reasons to use only partial carb heat?

Karl

LOP Configurations can require partial carb heat.

[RV8N]

Originally Posted by LifeofReiley

LOP Configurations can require partial carb heat.

OK... I guess my next question now is: Are you comfortable running LOP on a carburated engine?

I have a factory Bendix fuel injection (IO-360A1A) and my injectors need to be matched before I would even consider LOP.

Karl