I'm not sure if this has been talked about before and i know it's old news but im trying to work out whats better about a 4 valve head on these mini's... i'm kinda looking for numbers or data to support your claims as well not just "4 valve is good"...
I read in this thread http://www.miniriders.com.au/tech-talk/17124-china-bike-122cc-dohc-4-valve-project.html that he is using 19.5mm intake and 16.5mm exhaust valves and i did some calculations and the total intake from the 2 valves is less than a 28mm single valve and the total exhaust flow is way less than a single 24.5mm exhaust valve. i know in that thread it was just a project to see if it would work, but i see dirtmax has a four valve head in their catalogue and i can't seem to find a reason why it would be good...
I read in this thread http://www.miniriders.com.au/tech-talk/17124-china-bike-122cc-dohc-4-valve-project.html that he is using 19.5mm intake and 16.5mm exhaust valves and i did some calculations and the total intake from the 2 valves is less than a 28mm single valve and the total exhaust flow is way less than a single 24.5mm exhaust valve. i know in that thread it was just a project to see if it would work, but i see dirtmax has a four valve head in their catalogue and i can't seem to find a reason why it would be good...