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| efxr6wagon |
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This is probably a stupid question.
I've swapped the cam in my EF head. I don't usually turn the rocker assembly over, but leave it upright so the bolts don't fall out. This time, I turned it over and was surprised to find that the top half of the cam "bearing" surfaces are not machined at all - but left rough cast. Clearly, the camshaft doesn't touch these surfaces, or it would be stuffed the first time you turned the engine over. So, what is holding the camshaft to the head? The only conclusion I can come to is that the valve spring pressing up on the rocker arm pushes the roller end of the rocker arm down on the cam. I guess twelve valve springs provide enough pressure to prevent the cam from going anywhere. Is this right? Thanks.
_________________ 95 EF XR6 wagon, 17" FTRs, DBA rotors, KYB/Koni, AU bottom end, ported EF head, backcut valves, SS Inductions, Territory intake, 10.2 CR, Auckland 1258 cam, vernier gear, PH4480 headers, no cat, Tickford 2.5", 2800rpm stall, J3 chip |
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efxr6wagon wrote: This is probably a stupid question. No, not really. It's the best way to transfer knowledge....  efxr6wagon wrote: I guess twelve valve springs provide enough pressure to prevent the cam from going anywhere. Is this right? Yes, plus the cam chain and weight of the cam as well.
_________________ AU2 XR8 with Raptor VL, ported Yella Terra GT40P heads, Scorpion 1.6 RRs, XE264HR-14 Comp Cam, ceramic coated Hurricane Headers, 60lb injectors, Walbro 255, 200cfi cats, 3" exhaust & Snow Performance water methanol injection |
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