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Home > Help Needed / General Tech Chat > eleven stud drilling?

welshdan

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s wales

2nd Oct, 2008 at 07:53:33pm

hi, i will be drilling and tapping the block to take an 11 stud head. what depth can i go over the water pump end? is this depth measured from the tip of the drill bit or the full thickness of the bit?

also, what depth can i drill to at the flywheel end? many thanks

Rob H

4314 Posts
Member #: 700
Formerly British Open Classic

The West Country

2nd Oct, 2008 at 07:58:04pm




On 8th Dec, 2006 BENROSS said:
oh! like to add drill the thermostat side no more than 12.5 mm & tap
saves breaking in to the water pump gallery in the block

number 4 side the same depth as the others, i think 15 mm but please check

and then tap

torque up the two end ones 30 foot pounds no more

some peeps torque up number 4 side the same as the rest but i dont

each to there own

Isambard Kingdom Brunel said:
Nothing is impossible if you are an Engineer

welshdan

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s wales

3rd Oct, 2008 at 11:25:09am

is the 12.5mm from the tip or the full width of the drill?thanks

Nic

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9327 Posts
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First mini turbo to get in the 12's & site perv

Herefordshire

3rd Oct, 2008 at 11:27:55am

dont go depper than 12.5mm or else!!

Turbo Phil

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4641 Posts
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My sister is so fit I won't show anyone her picture

Lake District

3rd Oct, 2008 at 01:31:26pm

It doesn't matter that much if you break through anyway, as long as the stud is sealed correctly.

WWW.TURBO-MINI.COM


Mr Joshua

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Luton Bedfordshire

3rd Oct, 2008 at 03:32:52pm

Why would you want to do this? I have run 14:1 cr and not needed the extra bolts.

Is this a worthy mod when going to huge over bores ie 1380 and 1440cc etc etc etc?

Own the day

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