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pro .15 overheating

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Originally posted by LarryA
Taking the article for what it states, I stand corrected. I read it and found it interesting, in that some things I never heard before. I can't say that I desagree because I have only ever used 20% Nitro but have tried several brands. I currently prefer the O'Donnell Racing Fuel in 20%. I do get more discharged unburned oil but I do get better performance and easier tunning than I have with other brands. Blue Thunder is my current 2nd choice.
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That is what this forum is all about...education on our hobby. If we can't answer each others questions or help each other out, what's the point?

Hopefully, you will be better prepared for a time when you might choose to change your fuel's nitro content or just plain change brands.

Some day, you will have the answer to my questions and the information exchange will have come full circle.

Until the next time...have a blast with your RC.
 
I can't say it is better or worse than anything else. I started using it at a local track several years ago when I raced. Most of the guys that were using that brand and said they liked it over the other brands that were available at the time. The two main fuels used in my area were the Blue Thunder and O'Donnell. The O'Donnell is a few dollars more a gallon but it works for me and as long as it is available, that is what I buy. The O'Donnell is now owned by DuraTrax. At $29.00 a gallon it is not cheap, and to order, some places require you buy a case (4 gallons) and then you also pay a Hazardous Material shipping charge. Ordering it, unless a LHS will stock some, is not finacially feasable. Don't get me wrong, the Blue Thunder is a very good fuel also. I just have a tendency to stay with what I find is working and am not real fond of just experimenting at the costs of things today. I do know that my four different R/C's all require different carb settings with the O'Donnell than the Blue Thunder or even the Wildcat (which I do not like). All this might just be an illusion for all I know but I'm like the old dog set in his ways of doing things.
 
pro 15

sounds like your low end is to lean. - i run 25% trinity and a hot plug. if you faten it up that poping will stop. when it's running pinch the fuel line before the carb the R's should shoot up for 2 or there seconds the shut off.
 
I'm not an expert but I've read that pinching the fuel line is really not a good thing to do. If you think about it, all you are doing is starving the engine and causing a way lean condition. Doing this on purpose even for a few seconds cannot be good for the engine over the long run.
 
pro 15

That sounds to be true but i've also heard when shutting off the engine by pluging the muffler you leave fule in the block which is not good also. I'm some what new to nitro so any info is good info.
 
I have always tried to shut mine down by stopping the flywheel with the tip of my shoe. In the case of my Savage monser truck, that is not possible so I just close off the pipe to shut it down. I generally don't remove the body so the fuel ine isn't easy to get at anyway. The little fuel left in the engine should not be a big deal as long as it is not left sitting for any great length of time. I've done it this way from the start and my Super Athlete Buggy and Losi GTX are still running great after several years. If I will not be running for more than a week or two I generally remove the glow plug and crank the engine to remove excess fuel/oil then put a few drops of After Run oil in the cylinder and carb and crank the engine a few seconds to distribute the AfterRun. I have also read in manuals as far as pinching the fuel line. Maybe it has no adverse effects, I just never do it that way. I used to race and mine ran mostly every week so they generally didn't sit that long until the end of the season.
 
over heating

If your engine is new as you say and the break-in has been followed to the letter, I would suggest checking everything on your engine and set-up. start by pulling the glow plug,(often pick up junk from a new engine break-in, fragments etc.) loook at the element to see if it's pushed in or not,(it should almost be flush with the bottom of the plug). It is a good idead to replace after break-in anyway. What kind of plug are you using? If traxxas try MC-8 not MC-9 as the 8 runs cooler. while the plug is out flush the engine with brake cleaner, or nitro wash. Check the factory settings on your carb hi and low end needle. I've found that the hi needle works best 2 1/4 to 2 1/2 turns out, better engine life), low speed screw almost flush with end of throttle arm. In or out too much can cause over heating and poor runnig. One more thing that can contribute to an engine overheating is the idle screw set to fast of an idle. Opening inside carb opening should only be 1mm or the width of a plastic credit card. You stated your engine is new so I would rule out things like air leaks, but it wouldn't hurt to check everything is tight even the carb, they are often loose from the factory. Let me know if you reslove the heat issue. Worst case but a Megatech .16 next time out.
 
well, i got a temp gun and it was a tuning issue. runnin about 325 and got it down to 254 and at idle was 194. thanks for your help
 

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