journal 5 in one embodiment a seal 304 may be disposed in the upper section 202 to further exclude fluid and debris from entering the space between the inside of the split roller cone 24 and the journal 5 such seals are well known in the art and the particular seal s used are not intended to limit the scope of the present invention further grooves may be machined into surfaces onto either or both the upper section 202 or lower section 201 to provide a fluid u201c passageway u201d that moves the fluid away from the junction in one embodiment different cutting element types may be used in the lower section 201 and the upper section 202 to improve the drilling performance of the split cone bit for example pdc cutting elements may be brazed into pockets on the upper or lower surfaces 201 202 in other embodiments only portions of the upper portion 202 and lower section 201 may be coated with a hardfacing material in yet other embodiments either or both of the upper section 202 and lower section 201 may be formed from diamond impregnated material in one embodiment the split roller cone may be divided based on cutting rows for example the rotational speed of a roller cone is determined by the rotational speed of the bit and the effective radius of the u201c drive row u201d of the roller cone the effective radius is generally.