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Old 02-06-2007, 09:57 AM   #1
MotorSpecies ver1.6
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Default possible cylinder head warpage?

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 rulerClick the image to open in full size.(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
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Old 02-06-2007, 10:04 AM   #2
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Default Re: possible cylinder head warpage? (MotorSpecies ver1.6)

Click the image to open in full size. ..........
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Old 02-06-2007, 10:11 AM   #3
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Default Re: possible cylinder head warpage? (MotorSpecies ver1.6)

just send it to the machine shop and have them lap it flat.
standard procedure
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Old 02-06-2007, 10:33 AM   #4
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Default Re: possible cylinder head warpage? (MotorSpecies ver1.6)

i honestly think you'll be fine. Click the image to open in full size. whenever I do headgaskets and such I just make sure to follow the procedure to torque it down.
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Old 02-06-2007, 02:27 PM   #5
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put the cams and rocker shafts in. if they go in without fuss and spin by hand, youll be fine.
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Old 02-06-2007, 07:06 PM   #6
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truu truuuu,thanks fellas
Click the image to open in full size.

PS. lap????never heard of that procedure before??(coool).

what do they do exactly when they lap the head?
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Old 02-07-2007, 08:03 PM   #7
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Default Re: (MotorSpecies ver1.6)

same thing as milling.
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Old 02-08-2007, 11:29 PM   #8
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Default Re: (hybrid1990crx)

milling?!?!?im Definately not looking for a milling also am not looking to remove any material from the head(surface).If anything, as little material as possible.

Im having a hard time finding resonably priced straight edges too(dammit!!!).
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Old 02-08-2007, 11:44 PM   #9
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Default Re: (MotorSpecies ver1.6)

Quote:
Originally Posted by hybrid1990crx
i honestly think you'll be fine. whenever I do headgaskets and such I just make sure to follow the procedure to torque it down.
hybrid1990crx....do you get any leaks or sealing problems(leakdown test/compression tes).how do the/your motors run as far as abuse/longevity and fluid consumption(burning/smoking)?

Thanks Click the image to open in full size.
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Old 02-09-2007, 04:52 AM   #10
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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.

try enco for your machinist's straight edge.
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