Carb/Cylinder/Piston Port/Polish

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hamster huey

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On a few of my small and big block nitros I have ported the intake on the crank, fanged my sleeves, port matched the header, knife edged my rod, fanged my crank, knife edged the crank, polished everything, and a few more tricks. I never messed with the timing or anything in the block or balanced my crank. Combined with a lightened racing flywheel, lightened vented clutch bell, racing clutch, the powerbands are smoother, revs seem higher, and a tank of fuel lasts much longer. Pics are of my first.


Has anyone done anything like this on a gasoline rc 2 stroke? What I have heard of is windowing the piston, changing the timing, lightening the piston, porting the head, porting the carb, removing the choke. Im wondering can the crank be polished or knifed? Crank case? Carb? Rod? Are there any other parts that can be polished? I know most of its already almost polished its so smooth but surely there is something that can be easily improved. Im thinking about attacking one of my spare engines. It seems like a much larger task. Any of youse have experience with any engine mods like this?
 
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I have a lightened flywheel , ehaust timing raised to 176 , Ported intake and the side ports are at above 145 degrees. I have a tool set up to hold a dial indicator and a degree wheel to help with my porting check my " port timing "post . I reduce the weight on the piston and cut the skirt some have not did the window deal yet. I am not sure how it will due on high RPM. If you get into this project get you some ceramic crank bearings and zero drag seals to get full benefit out of your port job.
 
Polish make good pics, but this is not the way to get performance on a 2 stroke engine, the best is to leave it rough.


If you want power, you have to play with the port timing, port width, etc.... and a tuned pipe well calculated for your engine. Reed valve and added boost port also give a significant improvement.
 
Yeah there are easier power adders. I figured for free to tinker around with for the purpose of a smoother powerband, better fuel effeciency, better engine effeciency, and more revs.
 
Sprint 77 said:
I have a lightened flywheel , ehaust timing raised to 176 , Ported intake and the side ports are at above 145 degrees. I have a tool set up to hold a dial indicator and a degree wheel to help with my porting check my " port timing "post . I reduce the weight on the piston and cut the skirt some have not did the window deal yet. I am not sure how it will due on high RPM. If you get into this project get you some ceramic crank bearings and zero drag seals to get full benefit out of your port job.
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I once saw a video of a pro builder cutting the flywheel so it becomes lighter. It was stated that cutting the flywheel will allow it to turn faster and lighter. I think it was on a 27. something. Is this a good idea for any engine or just for some.
 
I have a lathe so it was not a issue.


I like the stock flywheel ( more mass) on a stock stroke. I like the lightened on a stroke crank.


Lightened flywheels can be purchased through DDM
 
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