QUOTE(archonixm @ May 20 2014, 11:51 PM)
In order to get the same bore with 4b12 in 4b10, i need to bore 2mm, bigger crank radius by (97 - 77.4) and shorter con-rod by (97 - 77.4/2) ??
Theoritically yeap
Logically no.
Coz there wont be any crank that can fit without customizing
And engine spec are precise up to 0.01mm ..
If u plan to put in the 2.4 crank u gonna blow the engine head as the 2.4 block is 11mm higher (if i remember correctly)
And the amount of price to custom build a crank rod (which im not sure even do able here, not forgeting the reliability) and also the shorter con rod... Not to mention the extra vibration u getting for such a long stroke.. U might not be able to rev high rpm if it is not done properly..
Juz for ur infor the 4B12 comes with internal balancer shaft due to its extra long stroke