Thread Tools
Old Oct 28, 2013, 12:57 PM
I Marauderer is offline
Find More Posts by I Marauderer
I Marauderer's Avatar
The fuel tubing must touch the barrel at WOT or the barrel oscillates and changed the venturi diameter and then the intake flow pulses and you lose power. If you want the barrel to rotate to the idle position and not stall out the throttle servo you must cut the tubing flat on one side that is installed on the carb body and diagonally on the other side that has enough tension to to keep the throttle body from oscillating at WOT yet compresses to let the carb barrel rotate to idle without stalling out the throt servo. It is a trial and error method of getting the tubing long enough with the just right diagonal cut to achieve the desired results.
Sign up now
to remove ads between posts
Old Oct 28, 2013, 01:54 PM
two-stroke is offline
Find More Posts by two-stroke
Registered User
two-stroke's Avatar
Quote:
Originally Posted by I Marauderer View Post
The fuel tubing must touch the barrel at WOT or the barrel oscillates and changed the venturi diameter and then the intake flow pulses and you lose power. If you want the barrel to rotate to the idle position and not stall out the throttle servo you must cut the tubing flat on one side that is installed on the carb body and diagonally on the other side that has enough tension to to keep the throttle body from oscillating at WOT yet compresses to let the carb barrel rotate to idle without stalling out the throt servo. It is a trial and error method of getting the tubing long enough with the just right diagonal cut to achieve the desired results.
Thats the answer I was looking for Thank you Marauderer!
Old Nov 11, 2013, 02:01 PM
Edalves68 is offline
Find More Posts by Edalves68
Registered User
Edalves68's Avatar
No one I know that is running 424 with these engines are running the tubing. I could be wrong, I just don't see any of the guys monkeying with it. The low speed screw is also turned out, unobstructing the venturi and is secured with some CA to get the most RPM's out of these great little engines. When the slow speed screw is out they won't idle very well. So I don't see the need for the tubing, if you pull it back after the race the engine quits, at WOT the barrel is unobstructed.
Old Nov 11, 2013, 02:19 PM
Edalves68 is offline
Find More Posts by Edalves68
Registered User
Edalves68's Avatar
Marauderer, could be right, I have never noticed any movement of the barrel at WOT during the running or race. Really curious now, I will inspect next time I run up one of the vipers? Thanks guys!!!!
Old Nov 11, 2013, 02:48 PM
I Marauderer is offline
Find More Posts by I Marauderer
I Marauderer's Avatar
I only needs the tubing if you remove the spring that holds the barrel in place. the reason for removing the spring is it has been know to break and get ingested in the engine ruining it.
Old Nov 11, 2013, 03:18 PM
Edalves68 is offline
Find More Posts by Edalves68
Registered User
Edalves68's Avatar
Everyone in our regional racing community has removed the spring to avoid the potential for the spring to break and be ingested. I have been told when it happens it happens during a flight/race it can be clearly heard. There is no doubt to what happened. I'm just not sure how many have used the fuel tubing substitute despite the fact that most are aware it can be used. Thanks
Old Nov 11, 2013, 03:36 PM
I Marauderer is offline
Find More Posts by I Marauderer
I Marauderer's Avatar
If I was racing against you and you were beating me I would tell you not to put the fuel tubing shim in the barrel. The barrel oscillating will slow you down a hundred rpm of so.
Old Nov 11, 2013, 03:45 PM
Edalves68 is offline
Find More Posts by Edalves68
Registered User
Edalves68's Avatar
Spoken like a true and experienced racer, LOL!!!!! That's exactly why I'm looking into it, it all adds up. The faster one gets, the slower the tips come in, ha!!!!
Old Nov 11, 2013, 03:53 PM
I Marauderer is offline
Find More Posts by I Marauderer
I Marauderer's Avatar
I have been working with a new racer this past year and at the Julian Race two weekends ago he beat both myself and two of my friends that have been helping him along. My one friend looked him in the eye and said that he was on his own now since he beat us. That has always been the reward for beating your mentors.
Old Nov 11, 2013, 04:05 PM
Edalves68 is offline
Find More Posts by Edalves68
Registered User
Edalves68's Avatar
Sounds familiar, I have been told at least a handful of times over the last two years or so, I'm now on my own. One of the things I love about the gig, is the sharing of information from one racer to another. What a great community. Even in the heat of competition, when tempers may flare. I love all the guys. We all have an edge, other wise we would collect stamps. Oops, I have some old stamps, LOL!!! I love the old racing stories. But, at some point, if it's perceived that one is getting in front of himself. (no, not me) you have to twist a little harder for more info. I have a friend and experienced MT racer, Leon Elbert, I tease him all the time that he gives me one tip at every event. That in ten years I might be able to keep up with him. It's mostly a joke, kinda!!!! It's a great hobby!!!!!
Old Nov 11, 2013, 04:08 PM
I Marauderer is offline
Find More Posts by I Marauderer
I Marauderer's Avatar
Yep, you are absolutely correct.
Old Nov 11, 2013, 04:08 PM
Dale 813 is offline
Find More Posts by Dale 813
Tampa,Fl
Dale 813's Avatar
Quote:
Originally Posted by I Marauderer View Post
I have been working with a new racer this past year and at the Julian Race two weekends ago he beat both myself and two of my friends that have been helping him along. My one friend looked him in the eye and said that he was on his own now since he beat us. That has always been the reward for beating your mentors.
Hmmmm. I assume your talking about me.

Don't sell yourself short Barry, you just didn't notice the JETT 40 I attached to my Plane in place of the Thunder Tiger.

This sport is Full of Super Nice people. Barry is a Large reason why I'm doing well.
Old Nov 11, 2013, 04:17 PM
Edalves68 is offline
Find More Posts by Edalves68
Registered User
Edalves68's Avatar
I'm truly blessed guys, I have some great racers out here, handing me my lunch regularly. It keeps me pushing, trying harder to go faster!!!
Old Nov 12, 2013, 12:56 PM
Edalves68 is offline
Find More Posts by Edalves68
Registered User
Edalves68's Avatar
Thanks for the info Doc, great read, in both cases!
Old Nov 12, 2013, 01:54 PM
I Marauderer is offline
Find More Posts by I Marauderer
I Marauderer's Avatar
Ed, I have more so stay tuned to your inbox. I just didn't want to overload you all at once.


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Sold New Thunder Tiger PRO 40 BB ABC badbill Aircraft - Fuel - Engines and Accessories (FS/W) 0 Jul 14, 2013 04:47 PM
Found Thunder Tiger Pro 40 fasthigh28645 Aircraft - Fuel - Engines and Accessories (FS/W) 2 Mar 02, 2013 06:02 PM
For Sale Macs muffler fits OS Max 25 FSR and Thunder Tiger muffler fits 25-40 Thunder Tiger monroec Aircraft - Fuel - Engines and Accessories (FS/W) 2 Feb 14, 2013 09:49 AM
Question Thunder Tiger .40 glow to electric question bsfixit Glow to Electric Conversions 7 Jan 20, 2013 03:28 PM
Sold Thunder tiger 40 PRO $55 Shipped ddllzzrr Aircraft - Fuel - Engines and Accessories (FS/W) 3 Jan 07, 2013 11:18 PM