IIRC Jake usually puts a steel rod in the control relief so it keeps as much oil in the mains. 75-76 914 cases have no oil control valves either and if you do the oil notch in the rods I would think this is a good thing as you need as much oil as you can get to the crank/rods with the rods spraying the bottom of the pistons/cylinders for cooling and oiling. On cases he has preferred the "W" and "EA" cases in the past as they are stronger with more meat in key areas so the mains don't pound out nor do the cylinder registers collapse.asiab3 wrote:I read on the internet, so it must be true, that Jake Raby only uses solid lifters in his T4 builds. Does anyone know his thoughts on the cases which lack control valves? Has anyone seen if his engines have the valves or not?Amskeptic wrote: [we interrupt this program for the following Type 4 Control Valve bulletin . . .
Type 4 control valves were NOT used in hydraulic lifter engines for the simple reason that the lifters happily utilized cold oil pressure to pump themselves up if and as necessary. Hydraulic lifters are continually bleeding themselves in operation at every down ramp off the cam lobes. I speculate that if you revert to solid lifters in a hydraulic non-control valve crankcase, the relief valve might spend too much time towards the bottom of its bore, playing "high rpm control valve", diverting oil that should be making a dedicated loop through the oil cooler]
He only will use solid lifters as the provide the best longitivtiy and hp vs hydraulics.