What is the max vtc degree for this skunk2 ultra 4 camshaft in 12.5.1 piston?
That combination sounds like it needs to be clayed for piston to valve clearance @ different vtc points to determine the max. pistons can come with a 12.5:1 ratio but have different valve reliefs /dome heights and design. It will take a few hours and cost a little to get the stuff you need from tractuff but it will save you a headache later if you over advance. You could “probably” use a stock RBB 25 gear and be fine.What is the max vtc degree for this skunk2 ultra 4 camshaft in 12.5.1 piston?
Yes, it's 12.8:1 with an 5 ccm dome, which would give you 11.0:1 in an 86x86 engine. The head volume is almost the same for all castings, around 50-52 ccm if they are fresh, clean and un-cutted. Honda uses different dome volumes and quench heights to adapt the different combustion approaches, from the eco to the performance applications.Estimated compression Around 13:1 ? Those pistons have quite the dome. Would the k24a head increase CR further ?