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96 geo 3cyl oil restrictor in head; head oil restrictor
Topic Started: Jun 12 2010, 11:45 AM (849 Views)
potter450r
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Hi every one im new to this forum. I am rebuilding my head on my 96 geo metro 3cyl and I don't have an oil restrictor in my head the screw in type with the tiny hole in the middle. I was wundering how crucal this is to the runing of the engine. Without it will I starve the bottom end of oil? I cant seem to find one does anybody know the diameter of the the hole in the middle of the plug or a roundabout good guess so I could make one up on the lathe.

Thanks Brady
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wikityler
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Some say...

Someone correct me if I'm wrong, but I believe that the restrictor was only used on the early heads (85-88). The later heads just used the check valve that sits in the block.
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91 ragtop
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I'm not sure what years had a restrictor but the dozen or so G10s that I have rebuilt had the checkvalve in them . The checkvalve is a restricor in itself as it necks the oil hole down from .250 to .100 inch. Ken....
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Dallas


Ive given up on figuring out why some heads have em and some dont. ive torn apart dozens of motors, and half of them are missing. from turbo heads to n/a heads, all 89+. I just figure someone forgot to put em in at some point, I buy em by the six pack and always put them in. if you hold the rpms high for an extended amount of time, the oil always fills up the head and either a) starves the bottom end or b) floods the valve cover and the motor eats it through the pcv

and 90% of the time you wont notice it happens, sometimes itll blow a thick blue cloud when you let off from holding onto all 55horses through third gear, and commonly mistaken for bad rings
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potter450r
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Hey thanks for the replys guys. I ended up making one up and putting it in anyways.
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