STROKER CAM TIMING V STD STROKE

[gunt]

Hi

hope someone has an input here , in my view the valve opening has little to do with crank degree [ lets say for this argument ] but more related to where the piston is in the bore so when stroking an engine how much will this affect cam timing and is there any way to get a better starting point

this is a honda b16 77.4m now 84.5m with only +.5mm over bore

Cheers

[digger]

The lower the rod stroke ratio the quicker the opening required assuming the original cam was correct. The more the cubes the more area under the lobe lift curve to make same peak hp rpm so a little more duration and lift

[gunt]

As in you advise changing the cam , so say im on a stage 3-4 cam and have my advised timing settings , is there a rule of thumb to have a better starting point that what the intended cams were for , when dealing with a stroker

[Geoff2]

Increasing stroke increases engine size, & makes the existing cam look 'smaller' in the new engine. Increasing stroke without changing rod length also reduces the R/S ratio, so the engine will probably tolerate a little more cam, all else being equal, before the extra cubes are taken into account.

[gunt]

so if it was any of you guys , yee would stay with the start at the advised cam timing figures regardless of the stroker