Confused in Savageville

[XXX]

After about a 2 week long slumber due to bad weather (rarely got above 20 degrees) I decided to take my savage out today (wopping 45* weather) I have got into the practice of always pre-heating my engine via wifes blowdryer due to it being winter. I went about my normal routine, and proceeded with the start up. I could not get the engine started for the longest time.

When it finally started to fire it would run for about 3 seconds, then shut off. So I increased fuel via the Throttle Trim on my transmitter to keep it running. No Problem it finally stayed running Until I placed it on the driveway and went about 10 feet it stalled out.

Now this repeated for about 20 minutes, get started, take off, stall. I thought I wasnt getting enough fuel but you can see fuel coming visibly from the exhaust.

I finally got it to take off and run so I started a little adjustment because it was so rich. I almost had a complete full turn to lean for the HSN, which was fine.

Here is the second part of my problem, the engine is still running way to rich. Fuel drips from the exhaust while idle. So I started turning back in increments of 1/8th to the LSN to wear it almost started to sound like it was starving of fuel. And fooled around with the idle screw. Its still acting as if its rich.

I took the head off later as I seen in the thread for reading your glow plug. The head looks like its brand new and as if it was just after break in. MY TRUCK IS 2 Months old now.! I would think I would have some sign of normal carbon deposit or something!


1. Its really rich, I'm at a full turn lean from flush on the HSN. But I don't want to stay so rich for fear of ruining the front bearing. And I'm about 1/2 turn from flush with the LSN. If i keep leaning the LSN it wont stay running. If I turn it back its to rich.

2. Its extremely hard to start after a few days of not running.

3. I run a Medium Plug from HPI. (Even changed up plugs, the current plug is brand new)

4. I run 20% Odonnells for the Savage, I want to switch to 30% when I run out of Odonnells ( about 2 quarts left). Could it be the fuel?

5. I took the air breather off and looked inside the throttle body. The gap is at its recommended spacing for closed throttle.

Sorry for the long post but just wanted to give an good idea what i went through the last 2 runs I had my truck out. don't know if this matters but I recently completed a mid tank mod, with Ofna Linkage, and now run a 250cc Tank.

 

[rodshemi]

i use a hotter plug when its cold out mc-59 seemed to help but I'm no expert

 

[ShiftPoint]

Only thing I could think is some kind of air leak or something to do with the pressure in the tank???

 

[mike]

adjust your high speed first then low until it runs good my brothers 4.6 is full turn on the high sp and little more the half on the low its fine just watch your temps at that setting what pipe you have make sure nothings clogged i don't start driving my one until its about 200 degrees couple revs here and there what was your temps that day maybe you were not up to temp..more the temp the leaner the fuel. i have four lrp on different rc and they all have a different settings and the same motor. hope this helps...good luck thanks

 

[X25]

I'm not sure of the problem but i would like to know cause my truck is also hard to start when it is cold. but mine has also sat for about two months' just figured that had something to do with it.

 

[XXX]

Yeah I'm thinking its just cold natured. Once i get it actually going its like a bat out of hades. But on the rich side. I think that it may be my fuel (Odonnells is known for its high oil content) and the fact it wasnt ran for a while. I think I'm a little paranoid about the richness getting the best of my front bearing. Cant wait till its like 60* + outside so i can get past all these winter blues.


I have not sealed the engine. Its now on my #1 priority list. Plus switching over to Byrons 30% like asap.

 

[ShiftPoint]

do you use the RTR or racing blend? I have been using the racing blend 25% but just ordered the 30%, haven't tried it yet.

Alot of what your seeing is probably just the weather, mine (both trucks) have been rnning hot the last couple times out, it is really strange, for a couple months I haven't had to touch the needles on either truck, they ran great and stayed around 235 degrees or so, just in the last 2 weeks at the same setting I am seeing up to 290, still lots of smoke and running great but they just get hot. I hate days like this.

ere is a good page, it has lots of good info but spesifically there is a chart for tuning and weather towards the bottom.

http://www.rchobbies.org/cars_eng-tuning.htm this is posted around a couple places in the fourm's so you may have seen in. gets hard to remember where stuff is iin here 🙂

Hope that helps

 

[X]

Can you tune it so It runs lean (just to see if the carb is working)? if not maybe somethings is wrong with the carb/ needles.

 

[X25]

i have seen that before but still a good find thank you

 

[XXX]

Who ever thought you would need a barometer to run a nitro truck

It could make sense why it acted the way it did. According to that page Shiftpoint linked, the air pressure may of played a part. It has been rather weird weather in this area after all.

:dunno:

 

[stang_racer]

my truck is doing the same kinda thing!!! its kinda cold but not really cold, well the snow isnt melting too fast. and it acts as if its really rich, the carb settings say its lean as hell, but the pipe tell me the exact oppisite