my first motor build and i may have possibly warped the head............
i removed the cylinder head on a b16a starting with the head bolts in the center and worked my way outward in a criss-cross pattern and i did it in a two step parttern. i found out later that night that i had to loosen the head in the reverse pattern(outward-in). im worried that i may have warped the head? please help.....thank you.
I measured for warpage. I used a feeler gauge and a 1ft.plastic architecture tri ruler(has three measurements, ruler resembles a churro with three fins).
at various points and angles on the head surface, i couldnt get the feeler gauge(set at .002in) to pass beneath the ruler while using a light pressure on the ruler . The service limit for warpage is .05mm or .002in. Am i alright or should get a machine shop to inspect it. Thanks
P.s. what about a dail indicator? thanks
__________________ Enjoy It!!! <U>(90 DA9/LS to RSi "conversion")</U>
if the deck was warped to the point that you noticed it with a straightedge, then your cam and rocker shaft bores would be too warped to get them in there, and your cams would bind once the caps were torqued.
a fresh mill isnt ever a bad idea, given that you can find a shop who will do it without
a) leaving the surface all ridgy like a record player
b) cutting it crooked.. where lengthwise is much much more important than front to back (int to exh)
"lapping" isnt a very good term for cylinder head surfaces. aluminum heads are cut with carbide/pcb/cbn inserts on vertical milling machines. some archaic shops might still be trying to belt sand but thats ancient history, iron heads are sometimes done on grinding machines, sort of like a flywheel grinder but with a lengthwise traveling table instead of a rotary table. i suppose some shops might use a segmented wheel on aluminum heads too, but it probably isnt that common.
"lapping" is when you run two mating surfaces around each other (the surfaces "run laps" around each other) with an abrasive, toothpaste-like compound to wear each other down. valves are lapped. heads are milled or ground.
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