PIctures of my engine work - Page 3 - RCCanada - Canada Radio Controlled Hobby Forum
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Nitro, Gas, Lipo chat (RC Car & Truck) All things related to Nitro, Electric & Gas motors... Tuning, experiences, setups and more.

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Old 03-23-2008, 01:28 PM   #21
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Originally Posted by truman View Post
how do you rebalance the crank shaft when your finished modding it?


there is only 1 way to actually balance one of these motors.. thats by actually running it while hooked to a vibrex rotor balancer.... Single cylinder engines do not balance in the same way as multi cylinder engines.... as well any form of static balance you may achieve will immediately be thrown out the window as soon as combustion happens over the piston...Combustion pressure greatly affects engine balance , so the only way to actually balance the engine is by actually running it on a isolation platform and using a harmonic balancing system to tune the crankshaft weights to balance out the engines running harmonics....... These single cylinder 2 strokes do not rotate uniformly like an electric.. they actually operate like a 1 legged man riding a bicycle...every revolution of the engine will result in different rotational accelerations depending where in the rotation the crankshaft is.... the crank accelerates on the downstroke and decelerates on the upstroke(as compared to average acceleration).....A single cylinder has only 1 power pulse per revolution, so the output pulse is very choppy and impossible to really balance against.. as different fuel %, compression ratio and tune will all affect the output pulse of the engine....

The only engine modder in the business capable of balancing these engines is EB Mods..he does own a Cahdwick Vibrex system and is capable of tuning the engine harmonics...... Though unless you actually run the engine any attempts to tune harmonics will be wasted... The engine must be balnced while it is in operation..... which makes balancing these things a massive challenge..... even as much as changing fuel % will alter the harmonics of the engine....
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Old 03-23-2008, 02:11 PM   #22
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Rob, maximo is on the right path and it is hard to balance these crank shafts but in reality, these motors are not as technically advanced as you think. They are very simple and most of these engines are balanced statically before assembly of the prototype. After that they are mass produced and depending on the quality of metals used, the weight of materials can vary slightly which would make it unbalanced so to speak and every engine runs just a little bit different even though they may come from the same mold. Most parts are casted and again depending on the number of impurities in the metals when casted will also help dictate metal hardness which metal even though its pretty hard will stretch under heat and pressure and that too affects the balance of the motor. From my experience, as long as you take off metal as evenly as possible from the crank and piston, the motor will run fine. I actually seem to get more motor longevity out of my turbo cranked engines due to the fact I remove material form the check to form the scoops which in turn moves the rotational mass closer to the center of the crank which in turn takes some stress of the rod and the bushings last longer. Everyone has their opinions and findings but in reality, these engines are not that sophisticated. If they were they would last longer than they do.

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Old 03-23-2008, 02:51 PM   #23
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this is nice work. Didn't even know that people modified Nitro engines.
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Old 03-23-2008, 04:05 PM   #24
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thats good info to know I often thought of trying to do some mods on an old engine but was afraid I might throw it way off.

thank you

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Old 04-05-2008, 11:28 AM   #25
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Just An FYI to any one thinking of having Max mod ur motor......Ive been his Right hand man since the beginning...driver that is....ushally im drivin in all the vids...and i could'nt be more impressed with EVERY single motor he does.....All the JPX's at the Nationals this year ran FLAWlessly....My c6 in buddy was NASTY fast...We didnt blow a Single glo plug All weekend...never needed more then 1/8 turn on the needle's All weekend...and had AWSOME power everywhere...not to mention the run times.....There isnt a Motor out there that Max cant make 10X better....he know's his stuff and takes his time doing it.....99% of modder's dont do what he does...So if ur lookin for Serious Racing HP MAX is ur man.
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