Originally Posted by
cathurga
JieM,
I have a few questions regarding the intake mods you have had done.
Firstly, why did you drill the big holes that you made as a later mod. The picture of you drilling out the bigger holes, why was that necessary.
Also in the pics of the test piece you made, I have put an orange arrow pointing to what look like a hole. Is it a hole, and if so, whats it for?
Drilling the big holes was a trail to improve the gases transfer betwenn the crankcase and the intake pipes. It seems to me that the only improvment was less latence when you change throttle. In fact, 4 years ago, I decide to only introduce a easy reversible solution. And with this flange, the engine worked 3 years long. 2 month ago, I decide to brake the rule and I drill the 3 holes.
The marks you can see on the 3D printed part are some pen mark where the CAD model has to be modofied (dimensions adjustment issue after trial)
You can try to download the stl files
here (save under)
JM