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Old 06-28-2020, 06:18 PM   #1
bugsmasher
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26cc Gas Engine Problem


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Can someone tell me what is wrong here? On the left is a CRRC 26 I flew a times. The carb mounts on the spacer diagonally making the throttle arm move properly in the horizontal. The engine on the right is a Turnigy (FTL) 26cc. On it the carb mounts in the horizontal making the throttle arm move in the diagonal. Why would the it be designed so that the throttle arm moves in the diagonal? How do I get around this? Any input would be appreciated.
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Old 06-28-2020, 07:00 PM   #2
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Re: 26cc Gas Engine Problem

I have the same engine and made a arm out of aluminium that I bolted on to the throttle arm with 2-56 screws.Then twist the end to horizontal and used a ball link connector I wish I could send a picture but don't have a camera
Hope this helps
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Old 06-29-2020, 02:21 PM   #3
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Re: 26cc Gas Engine Problem

I think I'm just going to try a flexible rod to a ball link. I just wonder what they were thinking when they designed the carb spacer to orient the carb that way.
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Old 06-29-2020, 05:01 PM   #4
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Re: 26cc Gas Engine Problem

They certainly were not thinking of model airplane drivers.

You will find that with most of these industrial origin piston port gasoline engines - Quadra and Zenoah from the very start are perfect examples - that the throttle linkage lined up perfectly with the carb for their intended usages, as in chain saws, weed whackers and so forth. Some did not.

In most cases, the solution for modelers was to bolt a 90 degree bellcrank onto the engine mount or crankcase and connect a linkage from that to the carb.

In the case of Zenoah, the carb insulator block was changed so that for the modelers, the linkage became a straight shot from the servo without the bellcrank.
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Old 07-01-2020, 06:55 PM   #5
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Re: 26cc Gas Engine Problem

That's it exactly. The carb spacer (insulator block) is what makes the carb orientation wrong. This is supposed to be a model engine though, not a weed eater engine. I looked to see if I could find a 3D file to print one that would orient it right but I didn't come across one. Maybe that's a money making opportunity. Anyway, the plane I'm putting it in already has a flexible cable. That should do it for 45 degrees.
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Old 07-01-2020, 07:01 PM   #6
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Re: 26cc Gas Engine Problem

Vogalsang, make a 90 degree intake for the Zenoah engines, sets the arm inline with the firewall, no bellcrank or flex cable needed.
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