laotsu Posted July 15, 2014 Report Share Posted July 15, 2014 I just found out that P90A L6 heads have hydraulic lifters. Since everything is interchangebal between L series engines, besides the obvious stuff, is it possible to use hydro lifters in an L4? I have read that the lifters wont tolerate high lift cams but I wonder if the stock L20b cam with hydro lifters would work. Quote Link to comment
Sealik Posted July 15, 2014 Report Share Posted July 15, 2014 Good question.....only benefit would be reducing/eliminating valve train noise That said.....30+ year old lifters would be on the verge of 'calving' and are now NLA Quote Link to comment
laotsu Posted July 15, 2014 Author Report Share Posted July 15, 2014 it's more of a gee whiz question than anything else since hydro lifters suffer bleed down and can't really push into the higher RPM realm. Quote Link to comment
Sealik Posted July 15, 2014 Report Share Posted July 15, 2014 Won't work....hydraulic lifter assembly is threaded different/ larger and won't screw into the more common L head 40 seconds in Quote Link to comment
620Turbo4X4 Posted July 15, 2014 Report Share Posted July 15, 2014 Solid and hydraulic cams are ground differently on the base circle. You can use hyd cams with solid lifters, but not the other way around. I've always ran my valve lash .001 tighter than spec on Datsuns to cut down on lifter noise. Never had any problems by doing so. Just that little bit makes a big difference on the noise. If your cam bearings are worn or misaligned from head warpage it helps to have a friend lightly pry up on the cam while adjusting lash to take up the slack in the bearings and compensate for the chain tension pulling down on the cam. If your engine is suffering from excessive valve train noise, give this trick a try. 1 Quote Link to comment
laotsu Posted July 15, 2014 Author Report Share Posted July 15, 2014 If your cam bearings are worn or misaligned from head warpage it helps to have a friend lightly pry up on the cam while adjusting lash to take up the slack in the bearings and compensate for the chain tension pulling down on the cam. If your engine is suffering from excessive valve train noise, give this trick a try. that would involve having a friend Quote Link to comment
laotsu Posted July 15, 2014 Author Report Share Posted July 15, 2014 Won't work....hydraulic lifter assembly is threaded different/ larger and won't screw into the more common L head 40 seconds in excellent spoon feeding there sir! Thanks. Quote Link to comment
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