My new 2.5 Engine has fried/died

[smokedsalmonkid]

So I bought my revo a month ago (my 1st nitro) and broke it in exactly how the DVD said. After the break in I took it back to my LHS who helped me tune it in. I ran it a few times over that weekend and it was fantastic...This week I took it out and could barely get it to start so I reset the needles back to factory settings and tried to tune from there I got it running a few times but after a while the head started smoking so I stopped running...Took it in to my LHS today and he tells me I have done serious damage to my engine and its days are numbered the head was black. He has re tuned it as best as he could but says it won’t be running great I gave it a run in the car park and it was very sluggish I'm gutted.

*Comment guys have I learnt the hard way about nitro through this experience changing setting I don’t know about?

*So will traxxas take back my engine? (It has only had half a galloon through it)

*And what is the exact name of that os engine that everyone mostly speaks about putting in their revos? (the one that requires no mods) or any other recommendations ?

 

[Revo Rancher]

Easiest way to go is the RB TM 323 kit. All the parts you need and takes about 45 minutes if you are familiar with nitros.

Traxxas most likely will not help you too much on a fried mill. They will most likely steer you in the direction of their engine exchange program.

 

[smokedsalmonkid]

Easiest way to go is the RB TM 323 kit. All the parts you need and takes about 45 minutes if you are familiar with nitros.

Traxxas most likely will not help you too much on a fried mill. They will most likely steer you in the direction of their engine exchange program.

thanks i'll proberbly not bother contact them i'll just have to put it down to expierience i had a read up on the RB TM 323 kit and it sounds fantastic I'm gonna have a look around this weekend for the cheapest offer i can get(any suggestions?)...I'm a newbie to nitro would you suggest i get my lhs to install it? ...i know we all have to start somewhere in this hobby but if this will be out of my depth i'd rather not mess this up aswell and just pay for him to do it.

 

[Revo Rancher]

It's easy. The instructions are not really clear, but go to the RB webiste and the directions and pictures are a bit better.

In the US you can find the kit for 219.00 USD.

 

[smokedsalmonkid]

It's easy. The instructions are not really clear, but go to the RB webiste and the directions and pictures are a bit better.

In the US you can find the kit for 219.00 USD.

ok thanks thats about £125 the cheapest i have found it is £129 so i'll probably go for that...i'll have ago at installing it aswell got to start somewhere i suppose whats the worst that can happen? (dont answer that i dont want to know :depress: )

but seriously have you ever heard of anyone elses 2.5r expirience ending so abruptly not even half a galloon through it?

 

[Revo Rancher]

I can help you on the install. One tip is to not attach the pipe first, just the manifold, and use one long manifold spring instead of the two little ones they give you.

The 2.5R has had reports of burning up early. Traxxas might get you a new mill. It's worth the time to call them and have a go at it. If they say no, well, then you get the upgrade. Their warranty service usually is pretty good.

 

[SVORay]

I wonder what kind of serious damage you've done to it and yet it still runsonder2:

It sounds strange to me but what do I know. I'm now pretty skecptical of LHS going by my own personal experience with one. I would pop in a new glow plug and take her back to stock settings. Once she's running, I would see what kind of tempature she's got going on. If the temp is 50 - 200 degress, she's proubaly running rich and if she's hotter than 230 - 270, she's probaly lean and over heating. If she's hard to start, try putting your figure over the exhaust pipe for a few seconds until you see the fuel htting the carb. Release quickly or it will flood her. Also make sure she's got a full tank if you don't have a longer than stock pressure line. My Revo had issues with fuel around half tank until I did this trick.

I mean I get smoke like crazy around my head everytime I run her long and hard. The next day, she starts up just like new, sometimes I need a new glow plug but she runs great afterwards.


Best of luck
Ray

 

[pitmaster]

i was at a lhs and was talking to one of the lhs workers. he has had 4 stock 2.5's go out in a row.. i felt so bad for him that i gave him a stock mill from my revo..

that and he was working on my car and added few hours of work time to it and few parts.

I'm so tempted just to take a stock revo out of the box and just hammer it.. to see if the mill seats right.. sence alot of people have problems . even if they break them in right. mite be fun. or $$ lol

 

[smokedsalmonkid]

I wonder what kind of serious damage you've done to it and yet it still runsonder2:

It sounds strange to me but what do I know. I'm now pretty skecptical of LHS going by my own personal experience with one. I would pop in a new glow plug and take her back to stock settings. Once she's running, I would see what kind of tempature she's got going on. If the temp is 50 - 200 degress, she's proubaly running rich and if she's hotter than 230 - 270, she's probaly lean and over heating. If she's hard to start, try putting your figure over the exhaust pipe for a few seconds until you see the fuel htting the carb. Release quickly or it will flood her. Also make sure she's got a full tank if you don't have a longer than stock pressure line. My Revo had issues with fuel around half tank until I did this trick.

I mean I get smoke like crazy around my head everytime I run her long and hard. The next day, she starts up just like new, sometimes I need a new glow plug but she runs great afterwards.


Best of luck
Ray

well my lhs tried to tune it but was struggling said its fried he took the cooling head of and said it was black inside he said it will still run but badly and the idleling will be poor said its best to get another engine v.soon

i have taken it out since for one tank and it was very sluggish i think he left it overly rich tomorrow i may try lean it out a bit after a few tanks see if i can get any performance out of her. if not the RB TM323 gets ordered monday

 

[SVORay]

I'm guessing this whole deal is a tunning issue and nothing more. That black inside the head could be typical of any nitro motor or one just running rich. It running rich would account for it running sluggish also. I would learn to tune that beast my self before wasting money paying someone else to do it for me. Also the outside tempeture will effect how these trucks run, just because it's rich today, doesn't mean it will be tomorrow. So I wouldn't go out side tomorrow with the idea of just leaning it out. I would try and see where you are before I started doing anything. A good way to do this is returning it to stock settings.


The 2.5's seem to have some kind of bad rep here but I don't believe they're all together that bad. I've had a blast with the two I got laying around here and they run pretty strong.

Ray

 

[jetmechG550]

Sounds like an airleak. Check your fuel tank lid gasket, after that the carb body and backplate. Very common for an airleak and it doesn't take long once one sticks its ugly little head up to destroy a mill. FYI, the OS .18TM is a direct drop in if you were wanting to stay small block.

 

[smokedsalmonkid]

took her out today reset back to factory settings (5 turn out adviced by my lhs) it started up fine gradually leaned her in saw a bit more speed but nothing like what i used to get and i couldn't get her into second gear at all...i didn't want to lean too much more because i wasn't seeing any real improvements...the funny thing is i had a ball today hitting my skate ramp at a more slower pace has actually improved my jumping but on a serious note i want the speed back what can i do to get her into second gear help!!!!!!!!!1

 

[jetmechG550]

Since your mill is probably toast, your not gonna get much out of it now. You can try a pinch but you'd have to buy the tool and I haven't heard much one way or the other as far how well they work. A new piston and sleeve for the 2.5R will run about $50USD. Should you go that route, I suggest sealing the mill up good when you are putting it back together.

 

[MonsterCowpower]

Reading all the posts here I think JetMech is correct.As a properly broken in engine that runns fine on the correct fuel/air mixture just does not go sour like this.

It is very important to get a infrared temp gun and monitor your mill from time to time during breakin and the first few runns.To make sure it runns within the safe range and does not overheat or run too cool during the breakin(heat cycling).

 

[SVORay]

took her out today reset back to factory settings (5 turn out adviced by my lhs) it started up fine gradually leaned her in saw a bit more speed but nothing like what i used to get and i couldn't get her into second gear at all...i didn't want to lean too much more because i wasn't seeing any real improvements...the funny thing is i had a ball today hitting my skate ramp at a more slower pace has actually improved my jumping but on a serious note i want the speed back what can i do to get her into second gear help!!!!!!!!!1

I had an issue getting more power out of my Revo along with not making it into second gear....Have you made sure you got the batteries fully charged?

Also, isn't stock settings 4 - 4 1/2 turns or am I off on that one? Again, get a temp gun to help tune that bad boy.

Ray

 

[jetmechG550]

Stock HSN is 4 turns.

 

[smokedsalmonkid]

Stock HSN is 4 turns.

I've been told by several people its 5 my lhs swears by it he even spent an hour arguing with traxxas on the phone abut it...but i suppose evryone has their own opinon I'm just a newbie swimming with the sharks and have no idea what I'm doing. i spoke to guy last night and he seems to think all is not lost with my 2.5r since it runs and all a bit of fine tuning good bring back a little performance i dont know about that it would be great but i think i'll use this engine to practice my tuning skills and will get a tm323 this week.

 

[SVORay]

I've been told by several people its 5 my lhs swears by it he even spent an hour arguing with traxxas on the phone abut it...but i suppose evryone has their own opinon I'm just a newbie swimming with the sharks and have no idea what I'm doing. i spoke to guy last night and he seems to think all is not lost with my 2.5r since it runs and all a bit of fine tuning good bring back a little performance i dont know about that it would be great but i think i'll use this engine to practice my tuning skills and will get a tm323 this week.

I stick with what I said earlier, this sounds a lot like a tuning issue to me along with a questionable LHS dealer. This is from my Revo manual page 25 far right grey section, " set the high-speed needle to 4 turns out from closed." It also says on the same page 25 white right hand side middle section, " Adustments are usualy made in 1/8 or 1/16-turn increments."

I would do the following if were me and see what happens. It's a lot cheaper than buying a new motor/kit if it works. Now if it's pretty cold out side, like around 20-50 degrees, I've sometimes had issues tunning mine in those conditions. It works better in 60+ degree days for me.

Charge batteries
Full tank of fuel
new glow plug
set HSN to 4 turns

Good luck
Ray

PS, If you do go with a new mil, let me know if you want to sale your old mil.

 

[smokedsalmonkid]

I stick with what I said earlier, this sounds a lot like a tuning issue to me along with a questionable LHS dealer. This is from my Revo manual page 25 far right grey section, " set the high-speed needle to 4 turns out from closed." It also says on the same page 25 white right hand side middle section, " Adustments are usualy made in 1/8 or 1/16-turn increments."

I would do the following if were me and see what happens. It's a lot cheaper than buying a new motor/kit if it works. Now if it's pretty cold out side, like around 20-50 degrees, I've sometimes had issues tunning mine in those conditions. It works better in 60+ degree days for me.

Charge batteries
Full tank of fuel
new glow plug
set HSN to 4 turns

Good luck
Ray

PS, If you do go with a new mil, let me know if you want to sale your old mil.

ok thanks for the advice mate ill be in touch

 

[jetmechG550]

Let your LHS know this became such an issue with people that were buying used Revo's or those that tossed the manual they went as far to put the stock settings on the website. Sometimes the hobby shop guru isn't always the guru they think they are. When I fried mine, the fuel tank o-ring went, no warning just overheated and shut down during a heat race. Couldn't figure out why. Same thing happened next heat. Checked under the cap and there was the blue o-ring all disfigured hanging there and I could almost blow on the flywheel and spin it the compression was soooo gone.