Throttle binding

[scsmith]

Originally Posted by WingnutWick

Yep, it does....here’s a photo.

I think you might have mis-understood the point. The cable connection to the throttle lever on the quadrant must be below the pivot so that when you advance the throttle lever, it pulls the cable.

If you attach the throttle cable to the lever above the pivot of the quadrant, then when you advance the throttle lever, it will push on the cable.

Oh, and as RocketBob said, the cable attachment to the throttle arm on the carburetor is usually with the cable end threaded and a clevis fitted to the end of it. The clevis pin goes through the throttle arm on the carburetor with a cotter pin.
McFarlane makes really good throttle cables. When I need to replace my green Vans-supplied cable next time, I will get one from McFarlane.

[airtractor8]

It may be just me but that throttle cable setup is giving me the shivers just looking at it
I would not use that type of cable on the throttle. I have seen that type bowden choke cable style break. Why not stop, take a step back and make some safety improvements while you have the cowls off.

Look into installing the proper quadrant that would push the cable instead of pulling it, and using short direct cables that connect to the carb from the back side.
https://www.vansaircraft.com/cgi-bin...oduct=quadrant and... https://www.vansaircraft.com/cgi-bin...uct=ctq-cables

As the others have said why not change the cable out to the correct length push pull throttle cable from Spruce or Mcfarlane with threaded ends on both ends to mount clevis or rod end fittings. You will find it will work much smoother than the choke cable style and especially if you drill the quadrant lever ABOVE the pivot and re route the cable to push rather than pull to advance the throttle. You will have to fashion a cable support bracket to hold the cable end near the REAR of the carb but that is not too difficult(add the mixture cable to it as well while you're at it). Vans may even sell one you can modify to fit this engine ( everything has to be modified to fit this engine!)

The mixture cable attachment is hard to see in the photo but looks to be a bugnut arrangement with a nyloc nut securing it to the bottom of the arm? This is a big no no in the Heat/Oil/Fuel environment under the cowling.The bolt is also too short with the nut at the end of the thread. Use a metal lock or better still castellated nut with cotter key.
I do use this type of cable and the bugnut arrangement you show on your throttle cable on my own mixture cable but mitigate the risk of cable breakage by using a mixture return spring from a Robinson R22 Helicopter. If the cable breaks or comes loose the spring pushes the mixture arm to full rich. Search for "Mixture Control Safety Spring" Part # A071-2 = Spring and associated hardware. It was a Service Bulletin for Robinson in 1984. https://robinsonheli.com/wp-content/...2/r22_sb41.pdf

Good Luck

Flying a H2AD in an RV6 for 14 years and luvn it.

[Walt]

Originally Posted by airtractor8

It may be just me but that throttle cable setup is giving me the shivers just looking at it
I would not use that type of cable on the throttle. I have seen that type bowden choke cable style break. Why not stop, take a step back and make some safety improvements while you have the cowls off.

Ditto that

[WingnutWick]

Hey guys - all great info and suggestions! It also confirmed what I was thinking about it to begin with. Again, we just got this plane and these cables were re-done right before hand due to binding and nothing mentioned in the pre-buy about the fact that they are basically the same connectors I used to use in model RC airplanes.

I am in the process of getting everything dialed in on this new plane and done correctly and this is one of them. I will be converting the connection to above the pivot (hopefully there is enough space - otherwise I'll change the quadrant), and use all appropriate cables and hardware as per your suggestions.

Thank you all for the input!

Much appreciated!

-Charles

[gasman]

Originally Posted by WingnutWick

Yep, it does....here?s a photo.

To reduce confusion, I was talking about the cable connections at the quadrent.

[WingnutWick]

Yes - I'm tracking that. Drill a hole above (if there is enough room) the pivot on the quadrant side inside the cockpit above the pivot to make it a direct push pull and replace the cables with legitimate cables and connections.

I think the pivot is right there at the top of the cover so I may have to modify it all and move the actual pivot lower if that's a possibility. Otherwise some sort of bell crank or throttle armature to reverse the throw inside the engine bay.

Thanks all!