Originally posted by mop_iko
that means, those thing i have bought is OKAY? wow.... at least i dont FLUSH DOWN my money in the toilet last sunday!
and which cut you saw in my pics? i didnt post any pic of my cuts.... i only post an article from RC CAR MAG .... which page tell me pls.... and can you help to explain for us here? pleeeaassseeeee.... a very small one.... hehehehehe...
I am not master, I am just learning it. LOL
I didn't meant that cuts on you engine, i mean the pics you showed.
As sleeve modding can give some tips. Every port on sleeve does it's own work. In 99% 0f desing engine the biggest issue is how to make design so it can be make not only on drawigs also in metal. It is pretty easy draw and much more dificult to mill that ports. The best scenario is when all corners on ports are squire ( unless noticed) but the minimum mill diameter usefull is so far we found 1.5 mm. We would love to have smaller, but it doesn't work, specialy when it comes to hard materials. So to compencate technology issues moddifiers do some cuts. On top of it, pretty often we desing port and we want to have variable angle across the port and it is pretty difficult to make on even 4 axis CNC mill ( it is possible to do, but cost is too high).
Even after all best deisgn are done and finaly sleeve is ready to run, run it and we can see on top of piston( when it start changing color to brown) how the flow going and according to that we want to add or correct flow and this is the moment when dremel time is in. It is happenning all the time during the testing of new product.
Just try to look on the sleeve on new broken in engine outside and you will see pic of heat impact-this is your dirrection where t go with cuts on ports. That pics on top of piston and outside sleeve will tell what has to be altered to have best flow of escaping gases and fresh mixture.
It is very long story to wright here, it is not only cuts, it is sleeve material ( which is imapcting flow too), it is crancase volume which is dictating vaccum and pressure levels and impacting speed and aount of mixture during the processes.
So the best thing to do is experimenting and collecting data base and use expirience of previouse experiments.
Happy father day for everybody