Copey
Posted a lot
Posts: 2,845
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Dec 28, 2012 14:35:04 GMT
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1990 Ford Sierra Sapphire GLSi with 2.0 Zetec 1985 Ford Capri 3.0 (was a 2.0 Laser originally)
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Dec 28, 2012 14:46:27 GMT
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The machine shop should have some data for measuring. Some heads have marks on them to show how much of a skim is acceptable.
Don't forget as you lower the head you also change the valve timing very slightly. If the effect is a negative for your particular engine then the more you skim the worse that effect will be.
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RobinJI
Posted a lot
"Driven by the irony that only being shackled to the road could ever I be free"
Posts: 2,995
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Dec 28, 2012 15:48:30 GMT
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I was about to say the same with the cam timing, worth checking that the chain tensioner will be capable of taking out any extra slack created too. From friends experiences I'm guessing it's worth changing the tensioner while it's all apart on these motors.
If I remember right they're non-interference engines, so assuming the cam timing's not too much of a worry, or is easily corrected then it should be possible to take a fair bit off. Best to check with the experts first though, I'm far from a Ford expert!
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Copey
Posted a lot
Posts: 2,845
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Dec 28, 2012 16:05:28 GMT
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aye, been through the timing issues with my old Pinto motor in the capri when the head was skimmed so that no worries, n aye, the tensioners will be changed when I am doin the head change as the are a weak link n EJ they do have a brass insert thats at the maximum, but i didnt know if that is actually the maximum or just what ford deamed to be the safe maximum, or is there a good amount to have skimmed as far as power figures go, hopefully someone will know, i have asked on the sierra forum but haven't had an answer yet cheers for the advice though guys appreciate it
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Last Edit: Dec 28, 2012 16:08:41 GMT by Copey
1990 Ford Sierra Sapphire GLSi with 2.0 Zetec 1985 Ford Capri 3.0 (was a 2.0 Laser originally)
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