Why is my rossi running so hot?
12-10-2009, 08:44 PM
#1
Why is my rossi running so hot?
I have a rossi .28 in a truggy and when im running it it will get pretty hot when im on the throttle a lot and bring it right in a take the temp. It has read over 300 a few times. When the truck is just driving around at low speeds and never really getting up to top speed in doesnt seem to do this.
Now it seems like a classic low speed is rich to fix lean high speed but there is a pretty good amount of smoke coming out.
It's not the clutch or drive train since it's all free spinning and the clutch is brand new.
Could it still be the low speed rich high speed lean thing?
The truck never stays at those hot temps, it goes right back down after idling for 10 secs or so.
Now it seems like a classic low speed is rich to fix lean high speed but there is a pretty good amount of smoke coming out.
It's not the clutch or drive train since it's all free spinning and the clutch is brand new.
Could it still be the low speed rich high speed lean thing?
The truck never stays at those hot temps, it goes right back down after idling for 10 secs or so.
12-10-2009, 08:49 PM
#2
to me that defiely sounds like a air leak somewhere my nova .21 bf was
doing the same thing.
doing the same thing.
12-10-2009, 08:53 PM
#3
yeah i thought that might be what is was but i sealed the engine when i got it so i have no idea. I took it out and did the soap and water test to check and i couldnt see any leaks. Unless it's the front bearing. It doesnt leak from what i could tell just a little nitro sometimes but i havent seen an engine that doesnt do that.
12-10-2009, 08:54 PM
#4
yeah i thought that might be what is was but i sealed the engine when i got it so i have no idea. I took it out and did the soap and water test to check and i couldnt see any leaks. Unless it's the front bearing. It doesnt leak from what i could tell just a little nitro sometimes but i havent seen an engine that doesnt do that.
what about the carberator
12-10-2009, 08:55 PM
#5
Is it preforming well, with no bogging, flat spotting, or high idling off of the jumps ? You say you have smoke, and your drivetrain is freed up, so I'm guessing that maybe your temp gun is the culprit.
Take the head off the engine, and check to see if there any pitting on the head button and/or piston. If there is, then you've ran it too lean a few times.
Take the head off the engine, and check to see if there any pitting on the head button and/or piston. If there is, then you've ran it too lean a few times.
12-10-2009, 09:03 PM
#7
Other than that I would say richen that beast up on top.... if the idles wants to drop, lean the bottom out alittle. Basically run the top just a tad richer than top speed achieved..... If your straight at the track is super long the engine can literally be running out of fuel being on the high side needle for so long and temps will rise very fast in that condition. Smoke isn't thedetermining factor for me really.... I can make an engine bellow smoke and run 300'... too rich will cause heat also
.28s arent exactly RPM monsters, the piston, rod and cranks in them are alot heavier than .21s so typically a .28 will turn 5,000+ less RPM and usually need a taller clutch bell to achieve the same speed.
12-10-2009, 09:04 PM
#8
put a drop of water on the head if it doesnt sizzle off instantly its not that hot...
12-10-2009, 09:18 PM
#10
here are the pics of the piston head and the button. my gun read over 325 today when i was trying to figure out what was wrong and that doesnt seem possible with the plug still in tact.
Last edited by Preston777; 12-10-2009 at 10:11 PM.
12-10-2009, 09:53 PM
#11
That plug doesnt look good at all..... and the carbon trail to the exhaust port on the piston tells me its been run pretty lean. I think your gun is right
Anytime the glow element (the coil) is dull, grey or white basically anything but shiny its a bad thing
You running odonnell fuel by chance?
Anytime the glow element (the coil) is dull, grey or white basically anything but shiny its a bad thing
You running odonnell fuel by chance?
12-10-2009, 10:19 PM
#14
It looks like an odonnell engine by the color of everything, not a bad thing
It'll be fine... throw that plug at the guy that sold it to you and get a longer plug.... take a close look at how far the plug goes into the combustion chamber.... the OS plugs are shorter than regular plugs. Thats a contributing factor to your tuning issues, your essentially running a super cold plug. OS plugs typically only fit in OS engines. Pick up some regular Odonnell 97's and tune those in, start from scratch. Richen the HSN 1/2 turn and start over
It'll be fine... throw that plug at the guy that sold it to you and get a longer plug.... take a close look at how far the plug goes into the combustion chamber.... the OS plugs are shorter than regular plugs. Thats a contributing factor to your tuning issues, your essentially running a super cold plug. OS plugs typically only fit in OS engines. Pick up some regular Odonnell 97's and tune those in, start from scratch. Richen the HSN 1/2 turn and start over
12-10-2009, 10:25 PM
#15
yeah i thought it didnt look right sitting in there haha. Im just going to go back to the factory settings and redo it. I am going to pick up a new temp gun though. I have a duratrax one and i dont like it at all. Are the 97's a turbo only plug? it's a standard plug engine.