Going to throw my buggy off a cliff!!

[godale03]

Sounds like your getting it...I'd richen it up a little to bring temps down though...if you're hitting 230 at idle you will be running it hot when you start to punch it.....I got a new RG last week and a friend is going to break it in on a stand....he does the wide open throttle breakin and his mills last a LONG time...he got about 15 gallons through his P5 before he pinched it...then got another 4 gallons after that.....if this one last me longer than 5 gallons I'll have to look at making a breakin stand.....I also found out my fantom .27 is loosing it's pinch so I'm having the same friend give it good pinch for me......I have the worst luck w/ engines lately.....2 mills in 3 weeks died on me...the fantom had less than a gallon in it and it only got heated once to 290....this blows chunks...I guess I wasn't pulling the piston down when I was breaking it in....I dunno..that engine was still temping at 255-260 when it ran dry...but after about 1 quart I couldn't keep it running and and I had the LSN almost completely leaned out.....so I figured I'd better shut down for the day before I totally killed another mill.......

Man Plaid, that sounds like some really bad luck. Tuning mills definitely is not an easy job, I am learning that first hand. Those are really decient mills too. I wonder what killed em? Doesn't sound like you killed em. You definitely have great knowledge on how to tune them.

Dude that sounds cool. I didn't know you could break in a buggy mill on a stand. That is how we broke in the mills when I used to fly. Just install them on the stand fuel em up and let em rip. It worked great. I have mills that I used to fly with that still crank. You will have to let me know how that goes. Maybe an idea for the next mill. I have been looking around for a new possible mill for the Maxx. Although right now I am looking at buying a set of tires for racing the Maxx this summer. Good luck my friend. If there is anything I can do to help just let me know. Take care bro.

Tom

 

[Plaidfish]

if you have an engine breakin stand for airplanes you should use it for your buggy mills too...I've been reading more on the way this is done....apparently they run em WOT and just tune to the temp and then stop every 1/4 tank and let it cool down then run it again like that.....it's the same method Paris (the Engine Builder) uses.....I would think he knows his poop right? anyway it saves me time to have him do it cause I run some loud pipes and I know my eighbors wouldn't appreciate 1 to 2 hrs of RC noise....LOL.....I chase one of em away when she sicks her dog out.....I only run em to finish a tank off if I didn't run it out at the track....so it's not often I do it, and this one lady decides she's gonna let her dog have a crack at my RCs.....well she now has a dog afraid of the noise since he tried to pick it up and he stopped the motor somehow, so I know he got hurt a little......oh well...

 

[olds97_lss]

As for the temp:
IMHO, that's kind of warm for that engine that early in it's life when its not really under load. When I run my OS 21 RG hard in my savage, the temps range from 210-250. 230 just from lazy 8's is kind of warm but it may be ok.

No two engines are the same even if they are the same make/model of engine.

For the WOT break-in:
The few articles I've read about people doing WOT break-in's with offroad engines is that you have to cover the head with something as they won't get warm enough due to the air the prop creates that blows over the head. Airplane engines don't have a "cooling" head like we're used to. They depend on massive airflow to keep cool, so the process works well for them.

 

[godale03]

I was afraid I was running it too hot, but the thing I am confused about is that I had to lean it out that much for the dang thing to run at all. It was running so rich that I was pouring more nitro out of the pipe than actually burning. I couldn't even blip the throttle to clear the snot out without is cutting off. I leaned the HSN from three turns out 30 degrees 4 times and it still would not run because it was too rich. My temps were only like 135, not hot enough for proper break in. So what should I do now? I didn't even have any smoke comming from the pipe until I leaned the LSN, well you had to look real hard to see it for all the nitro spitting out. If I am running it too hot, then do I need to richen the LSN back the half turn I leaned it? Man this is so frustrating. I thought that I was on the right track. Very disapointing. Oh well I guess it comes with the territory. Thanks for your help guys.

Tom

 

[olds97_lss]

You probably are on the right track. That's why I said it may be ok for "your" engine. All engines are a little different.

If you have to lean it to keep it running, then lean it. Once it's broken in (half gallon or so), tuning should be more predictable and easier.

 

[Plaidfish]

For the WOT break-in:
The few articles I've read about people doing WOT break-in's with offroad engines is that you have to cover the head with something as they won't get warm enough due to the air the prop creates that blows over the head. Airplane engines don't have a "cooling" head like we're used to. They depend on massive airflow to keep cool, so the process works well for them.

Yeah he does do a cover that slides over the head and then as he get's to the final tanks on the stand he slides it down to give 2-3 of the fins airflow...something about as it breaks in he starts to get the tune close to what it should be for it to run on the buggy.....this guy knows his poop for sure..he plays w/ buggies when he's waiting for parts to come in for his heli...he's also the heli mechanic at my LHS.....all I know is I never see anyone have their stuff RTR like this guy does.....he never seems to break down.....maybe some of that would rub off on me..LOL

 

[Revo Rancher]

godale03, I was having similar problems with my OS V-Spec. I did not have to lean the LSN to get it to run hotter (220) after 1/2 tank of mid speed passes, but I did have to lean my HSN about as much as you did. I think you are on the right track. Keep running it the way you are for a few more tanks. It really needs to seat well before you make many more throttle adjustments. Leave the LSn where it is for now as at least you can get it to run off the line, and lean the HSN a bit more if you need for it to run without sputtering.

It also helps to dump the snot out of the pipe after every run.

 

[godale03]

Cool guys Thanks for the info. This is my first attempt to tune a big block and I am wanting to make sure I am not toasting the motor. I am just thrilled that I was able to blip the throttle. I was going to run a few more tanks through and then richen the LSN a quarter turn and then see what happens. The temp stayed constant though at 225, it didn't get any hotter. Like I said before my temps before that were like 135. I just don't want to rush this. In fact the first 3 tanks were with the bug off the ground. Once the wheels started to spin on the 4th tank I put the bug on the ground and did my lazy 8's with very little throttle response. I know that I will have to idle it down once broken in I was just excited as hell to see the thing running!

One other question though... when I am done running it is it normal for like a teaspoon of oil run out of the pipe? It was very thick like syrup. Thanks guys

Tom

 

[olds97_lss]

One other question though... when I am done running it is it normal for like a teaspoon of oil run out of the pipe? It was very thick like syrup. Thanks guys
Tom

It's normal. Once you have the engine broken in and are able to crank some real RPM's through it, it will blow out most of the sludge while running. But since your breaking it in, your not getting enough exhaust flow to get all the sludge blown out.

 

[godale03]

It's normal. Once you have the engine broken in and are able to crank some real RPM's through it, it will blow out most of the sludge while running. But since your breaking it in, your not getting enough exhaust flow to get all the sludge blown out.

Thanks Olds... I know I ask alot of questions but at least I am learning a whole lot. If were not for you guys on this forum I don't know what the heck I would do. You guys are life savers. I do have another question though... Is it normal to get little or not smoke during break in and not have the temps high? Thanks

Tom

 

[olds97_lss]

It has been pretty normal for me. Until you get the temps up and actually start burning the fuel, smoke is minimal, but if you don't have smoke, you should get a lot of fuel spatter coming out of the pipe.

 

[Revo Rancher]

Tom, as Olds says, until final tune and/or full break-in you will get a lot of snot, spatter and little smoke. Once I leaned my V-Spec after break-in, it fianl showed thick blue smoke. I am leaving it a little bit smokey still as it needs a couple of hot runs to satisfy me that it was fully broken in. I only hit 225-238 (outside/inside temps) at the last run. Iwant tog et at least the better part of a tank at 240.