Combustion chamber texturing-2 stroke engine

[powerhouse]

Has anyone done this ? If so what results were seen ? I've been doing research lately on 2 stroke chamber designs and haven't been able to find any information on this. Thx

[Frankshaft]

Rk Tek does some sort of chatter finish. Picture a super chattered valve seat, but in a 2 stroke chamber. His stuff seems to run good.

[GRTfast]

My dad and I built some cr125’s years back that were competitive at the international level in pro shifterkart racing. We used bathtub style combustion chambers and polished them to a mirror finish to prevent hot spots that can cause detonation. Look at the combustion chambers in Yamaha TZ250 engines for some guidance.

[af2]

My dad and I built some cr125’s years back that were competitive at the international level in pro shifterkart racing. We used bathtub style combustion chambers and polished them to a mirror finish to prevent hot spots that can cause detonation. Look at the combustion chambers in Yamaha TZ250 engines for some guidance.

Yep the chamber is not where you want disruption. That is the job of the intake and side ports. Polished chamber and piston work!!

[Circlotron]

Texturing a surface would only increase the surface area and so probably increase the transfer of heat to the metal surface, something you don't want. What the texturing does to the boundary layer of gas right next to the surface complicates things though. It may depend on the coarseness of the texture.

[af2]

Texturing a surface would only increase the surface area and so probably increase the transfer of heat to the metal surface, something you don't want. What the texturing does to the boundary layer of gas right next to the surface complicates things though. It may depend on the coarseness of the texture.

I also meant to say that is not where you want it.

Work on the Exhaust. The motor will love it.

[jake197000]

when i used to run snowmobiles on quarter mile on ice.i had the pistons and heads coated by swain my pipes too.after that never burned another one down my egts were more stable 150 plus was like being strapped to a rocket.

[powerhouse]

Thanks for the replies gentleman. I've had good luck leaving a chipped Burr finish on the 4 stroke stuff I've done, both auto and motorcycle, but have never seen or attempted it on a 2 stroke. I have a few ktm 300 heads I need to cut to set up the squish and thought this might be a worthwhile modification. The engines run in mostly the 1/8 to 3/4 throttle range ( tight trails ,technical stuff) hardly ever wot, and I figured this may help with combustion and fuel mileage. Since heads can be bought for so cheap and are easy to swap I may give it a shot and see what happens.