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Originally posted by sparksy could be a number of reasons.... age running lean poorly looking after the engine defect vibration revving too high for too long poor lubrication Andrew |
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Was the piston and sleeve overly tight during break-in? This can cause stress on the rod bushing and make it fail prematurely. I always check mine after break-in and replace it, I also replace the rod at every rebuild especially my modified engines that see a lot of abuse.
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Originally posted by Motorman hooked on, its more than likely a fuel problem( to little lubricant in the fuel) or it went lean some how.A thou rod clearence is at the upper end and the crank is probably contributing to half of that. However it should have lived. I'll be out of town working a few months so I won't be responding to any posts. Have fun racing, looks like the balance of my season is over. I was using 6% Casta with 6% Klotz using 15% nitro like i have been using for the last 12mnths. We did some further port timing work on the crank with this last built and i wondered if the extra rpm that the engine produced would casue the rod to fail like it did? |
Originally posted by hooked_on I was using 6% Casta with 6% Klotz using 15% nitro like i have been using for the last 12mnths. We did some further port timing work on the crank with this last built and i wondered if the extra rpm that the engine produced would casue the rod to fail like it did? |
I've run some pretty nasty CV.12's and never had a rod failure because I kept it changed. What's a $12 rod compared to a $60 engine? The rod was probably past due on a change and just gave up the ghost.:tire:
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Dennis,
Check yo mail foo!;) |
Can anyone tell me where I can find Jtek mega .12 motor made by nova mega. Does anyone know anything about the motor.
Or can you tell me where I can find a pistion and button combo that has the dimple in the pistion.Locvated on the top of the pistion. Thanks for the help!!! |
i havent had anything to do with the engine before but have u use a piston locking tool on the engine before, if u have u have pushed too hard and u have put that dimpel in the piston yourself
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:lol: :p :D :ha: :blush: :smile: :nod: :cool: :o :eek: :confused: :cry: :cry: :cry: :cry: :cry: :cry: :cry: :cry: :cry: :cry:
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Originally posted by stefan :lol: :p :D :ha: :blush: :smile: :nod: :cool: :o :eek: :confused: :cry: :cry: :cry: :cry: :cry: :cry: :cry: :cry: :cry: :cry: ahhhhhhhhhhhhh whats that meant to mean |
d richey
i got the motor fri and put it in the car and head to track. i break it in and after 2 tanks i lean it a little and man that motor pass 3 cars on a straight away on 1/2 throttle. i'm happy with this motor.
thanks a lot S S MD 20902 |
Hurhur and W.Folk. your both right. the ramp smooths the entry as the 12 cranks are not machined with a ramp like the 21's are. Durability of the crank itself is not a problem with this mod and allows the engine to spool up quicker as the moment of inertia is lower but not by much as the mass is close to the point of rotation. The draw back is there is only a few fillers that can be used to fill the hole and make the ramp. I have not found one that Nitromethane will not attack and it eventually disloges or becomes loose |
So Dennis, can you give us the gist about how you balance the crankshaft when modifying engines.
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