today's wreckage

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Jay F.

Jay F.

Well-Known Member
Messages
224
Location
chalmette louisiana
Well, today's carnage includes the piston rod in my buggy. Had all the rc's out for some exercise and it died. Upon further inspection, the bearings in the bell froze tearing up the rod. Oh well, maybe a good excuse for a new engine lol
 
Yep. Think I'm going to order an lrp .28, put it in the savage and put the f4.6 in the buggy. Still may order a piston and sleeve/rod set. Always good to have a spare
 
I wrecked my lrp z.28r spec3 today
I don't know what was happened i gave full throttle and it shuts down the pistons are still ok but the crankshaft broke in 2 do you guys know whats happened image.webp
 
:whoo: how old is that :ercm: could be a lot of things happened there, Hydraulic Lock, or maybe even a faulty crankshaft with a crack in it..... or even something may have popped up and locked the flywheel while it was running....
 
Jam Racing 1 said:
:whoo: how old is that :ercm: could be a lot of things happened there, Hydraulic Lock, or maybe even a faulty crankshaft with a crack in it..... or even something may have popped up and locked the flywheel while it was running....
Click to expand...
The motor is 1 year old
Can it be possible that i overtighth the spur gear and i see the clutch shoe have been worn outimage.webp
 
I am very saddened to hear you lost your connecting rod. I assume the shrapnel burred other components (the piston/sleeve?) leaving the engine useless. Otherwise could you replace the connecting rod? I am very new to this, but cannot understand the correlation between bearings 'freezing in the bell' causing this. I can visualize too much RPM (under zero load) putting strain on the connecting rod's bushing but fail to see how the races of a bearing can overpower the clutch bell (I assume the clutch bell is stronger than the bearings inner/outer races combined). Could it be perhaps the engine was running too lean, thus lacked proper lubrication? I just bought my first glow engine, however I'd assume the principle of seized parts is the same? Please let us know what the result it and I'm very sorry that this happened to you
 
Newbie Savage Owner said:
I am very saddened to hear you lost your connecting rod. I assume the shrapnel burred other components (the piston/sleeve?) leaving the engine useless. Otherwise could you replace the connecting rod? I am very new to this, but cannot understand the correlation between bearings 'freezing in the bell' causing this. I can visualize too much RPM (under zero load) putting strain on the connecting rod's bushing but fail to see how the races of a bearing can overpower the clutch bell (I assume the clutch bell is stronger than the bearings inner/outer races combined). Could it be perhaps the engine was running too lean, thus lacked proper lubrication? I just bought my first glow engine, however I'd assume the principle of seized parts is the same? Please let us know what the result it and I'm very sorry that this happened to you
Click to expand...


Sorry I think you misread and did not see the picture, the damage is severe when the crankshaft breaks in two...
at the point he is now I would just spring for a new :ercm: and start fresh..... like I said above in my earlier post #5 the cause could be a number of things breaking that crankshaft, and in the induction tunnel of the crank I see rust and signs of foreign stuff in the crankcase, possibly due to not taking care of the :ercm: either way it is needing a new :ercm: price wise it would be about the same cost , and that is if one can locate the parts in the first place..
 
Sorry, I was referring to the first post in this thread. As for the second post (broken crankshaft) I dunno. Either it's a cheaply made engine or not well-maintained. I never heard of it but how can it not be one of the two? I'm also curious why you state 'nice carnage'. Isn't the goal for this to not happen? Again, I'm new but doing everything I can to ensure my engines run strong for a long time. If that is bad, then I want to be bad.
 
Yes I see those are 2 different posters with catrastrophic failures of their engines, things happen when a screaming nitro engine stops suddenly :lmao: in both cases a new bullet is the answer
 
Well think about it, an :ercm: running almost wide open and suddenly stopping, inertia is a funny thing, something just has to give to absorb it all......
 
I later discovered the one way bearing seized up too. I run my engines around 240°. I think the one way seizing, anong with the bell freezing and me hitting the breaks all at the same time created a "perfect storm" sort of. I checked the oiston and sleeve, they're fine. I may order a new set anyway from ebay, I'll have a new engine then. First time an engine has ever failed me lol
 
I don't rely on temps soley. I tune by smoke, performance, sound, and the old school spit test(yes, I'm that old 😉 ). I check temps for reference
 
I sold the buggy as a roller. A good friend of mine is selling his son's savagex, the 25 version. I plan on getting it, doing some modding, and probably slap an lrp in it.
 
You noted the engine temperature and I never considered that after the running in. I was thinking when the air mixture was set based on current weather the temps would fluctuate some but not much. I guess I better check the temp after leaning the air mixture shouldn't I? What temp (hi or lo) should I be worried about? I never realized how serviceable the 2-strokes were. i looked t piston/cyl and noticed you can purchase almost any part for it. What is the mot suspect part to give out first??Is it the connecting rod bearing? Looking at some of the RPM these suckers put out it would seem the connect rod/drive shaft bearing would develop play or the one-way-bearing. I am surprised the ritzy engines don't come with internal temp monitoring automatic shut-off. I believe it was on here where the guy create that for his HPISavage he put a temp reader on the engine and once it got based a defined temp the engine would automatically shut down so it can cool off before running again.

My hope is if the air mixture is properly balanced with the fuel the temps will not fluctuate too much. That is my hope. This is good information for everyone
 
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