Throttle pushrod on Magnum 52 4stroke
#1
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Throttle pushrod on Magnum 52 4stroke
The darn throttle arm is directly behind the motor just a tad off to left of center. To far off from the side of the mount for a doulbe arm setup. cannot access from behind through the firewall due to tank in way. U shape rod will be to large a U shape to be effective w/out bending. I'm stuck. I dont want ot use ball links as i've have them vibrate off before which is not a good thing.
#2
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RE: Throttle pushrod on Magnum 52 4stroke
You run your linkage to a arm on the side of your motor mount then back to you throttle arm, it is a relay linkage.
Larry k
Larry k
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RE: Throttle pushrod on Magnum 52 4stroke
you can also rotate the carb on most magnum 4 strokes. most times this will move the arm far enough to the side to clear the tank.
#5
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RE: Throttle pushrod on Magnum 52 4stroke
I'll look into rotating the carb.. didnt know that could be done.. I have used the dubro relay arm deal but wont work in this case. Arm is direclty behind the motor.. way to far of of line with the beam of the mount on which the secondary arm mounts.
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RE: Throttle pushrod on Magnum 52 4stroke
ORIGINAL: KitBuilder
I'll look into rotating the carb.. didnt know that could be done.. I have used the dubro relay arm deal but wont work in this case. Arm is direclty behind the motor.. way to far of of line with the beam of the mount on which the secondary arm mounts.
I'll look into rotating the carb.. didnt know that could be done.. I have used the dubro relay arm deal but wont work in this case. Arm is direclty behind the motor.. way to far of of line with the beam of the mount on which the secondary arm mounts.
I had the same problem with this engine in my Sig 4*40 but I made the Dubro relay arm work. It's late here but I'll try to get a picture of the setup in the morning and post it. It took a little figuring but I got it to work very well.
Cheers,
Andy
#7
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RE: Throttle pushrod on Magnum 52 4stroke
Oldtyme.... I would appreciate the pic.. .I'm in a holding pattern on this at the moment hoping I get an epiphany on how to get this to work. I'm a bit fussy on my throttle setups liking to have finite control over the entire range.
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RE: Throttle pushrod on Magnum 52 4stroke
ORIGINAL: KitBuilder
Oldtyme.... I would appreciate the pic.. .I'm in a holding pattern on this at the moment hoping I get an epiphany on how to get this to work. I'm a bit fussy on my throttle setups liking to have finite control over the entire range.
Oldtyme.... I would appreciate the pic.. .I'm in a holding pattern on this at the moment hoping I get an epiphany on how to get this to work. I'm a bit fussy on my throttle setups liking to have finite control over the entire range.
Andy
#9
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RE: Throttle pushrod on Magnum 52 4stroke
I typically make a double dog leg push rod to a Z-bend at the carb,, then use a good ez connector at the servo.
Basically you come out the firewall, 90 degree bend, then another 90 bend to the carb connection,, all the adjustment is at the servo. that set up has worked well for me in several airplanes. If you really need a pic I can pull the cowl off my kingfisher, I need to redo the fuel lines anyway
good luck
Basically you come out the firewall, 90 degree bend, then another 90 bend to the carb connection,, all the adjustment is at the servo. that set up has worked well for me in several airplanes. If you really need a pic I can pull the cowl off my kingfisher, I need to redo the fuel lines anyway
good luck
#10
Thread Starter
RE: Throttle pushrod on Magnum 52 4stroke
I undersand what your saying.. but I think the distance between my 90 degree bends will be to great causing a bit of flex. I;ll play with a couple options tonight and see how it goes. I dont know if Iwould trust an ez connector on anything glow due to vibration, but thats just me. I've get them all over on my electrics
#12
RE: Throttle pushrod on Magnum 52 4stroke
I have stopped using solid rods for throttle, instead, I use flex wires and I can route the link as needed to avoid obstacles like tanks ans whatever. The pic from jknox is great. I would just change the solid rod for flex cable.
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RE: Throttle pushrod on Magnum 52 4stroke
KitBuilder,
Photos are in progress. I had trouble with my camera and software so my wife, who is an excellent photographer took the pictures and is working on them now. I will post them shortly and if you wish you can email me at [email protected] and I will email them to you as well. I didn't forget you and have been frustrated at the problems I've been having this morning. My wife can also put them in a pdf if that will work as well.
Andy
Photos are in progress. I had trouble with my camera and software so my wife, who is an excellent photographer took the pictures and is working on them now. I will post them shortly and if you wish you can email me at [email protected] and I will email them to you as well. I didn't forget you and have been frustrated at the problems I've been having this morning. My wife can also put them in a pdf if that will work as well.
Andy
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RE: Throttle pushrod on Magnum 52 4stroke
OK KitBuider............here ya go!! I used the DuBro 4-stroke linkage kit and this setup works quite well.
Regards,
Andy
Regards,
Andy
#15
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RE: Throttle pushrod on Magnum 52 4stroke
I have the same engine and I used a thin piece of music wire in an antenna tube, essentially making a flex wire connection. It doesn't take any torque to operate the throttle, so the flexible connection works fine.
#16
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RE: Throttle pushrod on Magnum 52 4stroke
Thanks for the info... Oldyme.. I've always been wary of those ez-links on high vibration setups. I've got them in my electrics only at this point. I'm working through it all.... .. my arm at WOT is right against the firewall and I switched to a more flexible connection that l'll support along the way. I've got the tank in place and once this is done the construction is over and it's on to covering.
My baby!
My baby!
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RE: Throttle pushrod on Magnum 52 4stroke
ORIGINAL: KitBuilder
Thanks for the info... Oldyme.. I've always been wary of those ez-links on high vibration setups. I've got them in my electrics only at this point. I'm working through it all.... .. my arm at WOT is right against the firewall and I switched to a more flexible connection that l'll support along the way. I've got the tank in place and once this is done the construction is over and it's on to covering.
My baby!
Thanks for the info... Oldyme.. I've always been wary of those ez-links on high vibration setups. I've got them in my electrics only at this point. I'm working through it all.... .. my arm at WOT is right against the firewall and I switched to a more flexible connection that l'll support along the way. I've got the tank in place and once this is done the construction is over and it's on to covering.
My baby!
I've been using EZ links for over 30 years and have never had a problem on any of my glow applications. I don't do electric.........real planes make noise. Is that a Balsa USA Sopwith Pup.............if so that is what I have on the shelf and I'm using the same engine on it as on the 4* that is pictured.
Cheers,
Andy
#18
RE: Throttle pushrod on Magnum 52 4stroke
ORIGINAL: scale only 4 me
I typically make a double dog leg push rod to a Z-bend at the carb,, then use a good ez connector at the servo.
Basically you come out the firewall, 90 degree bend, then another 90 bend to the carb connection,, all the adjustment is at the servo. that set up has worked well for me in several airplanes. If you really need a pic I can pull the cowl off my kingfisher, I need to redo the fuel lines anyway
good luck
I typically make a double dog leg push rod to a Z-bend at the carb,, then use a good ez connector at the servo.
Basically you come out the firewall, 90 degree bend, then another 90 bend to the carb connection,, all the adjustment is at the servo. that set up has worked well for me in several airplanes. If you really need a pic I can pull the cowl off my kingfisher, I need to redo the fuel lines anyway
good luck
#19
Thread Starter
RE: Throttle pushrod on Magnum 52 4stroke
What size wire....and what is the length of wire between the two dog legs. it seems there would be to much bend for accurate throttle repsonse?
#20
RE: Throttle pushrod on Magnum 52 4stroke
Use throttle cable instead. It's all I use now for the 4 strokes, you can run it around the tank, and have it come out right at the throttle. The key is to make the hole for the tube oval and only glue it at the back side of the firewall so it can flex with the throttle arm. I tried using solid wire pushrods, but they just dont work well.
Check out the electric to glow T-34, I have some pics in there of the setup.
#21
My Feedback: (158)
RE: Throttle pushrod on Magnum 52 4stroke
ORIGINAL: KitBuilder
What size wire....and what is the length of wire between the two dog legs. it seems there would be to much bend for accurate throttle repsonse?
What size wire....and what is the length of wire between the two dog legs. it seems there would be to much bend for accurate throttle repsonse?
I have a 1.25mm (sae??) piano wire in a sleeve made from the inner yellow nyrod, this has worked the arm of a ys120 for over 15 years on my kingifsher, just no way a cable would work where the throttle are is located. Sorry, you had your chance for me to take a picture,, it's all back together now.
#22
Thread Starter
RE: Throttle pushrod on Magnum 52 4stroke
No worries on the pic.. i understand how it would look and work. I have tried U bends and other assorted things with no luck in what I wanted to accomplish which is probably my execution of the idea.
#23
My Feedback: (158)
RE: Throttle pushrod on Magnum 52 4stroke
Looking at the picture of the plane, it would seam you have a lot of fuse to work with, have you tried off setting the tank and flipping the carb around to get the arm to the left side of the engine? that typically can give you more room to work with alone
Is the motor mounted inverted?
Is the motor mounted inverted?
#24
RE: Throttle pushrod on Magnum 52 4stroke
Dont know if this helps or not, but my throttle cable setup on my T-34. Isnaked it around the tank, using a Dubro tank that sets the pug back from the front for a little more clearance.