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t3gav

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Gavin@minispares.com

kent

1st Apr, 2005 at 10:46:15pm

this may be stupid but i'm thinking of sending my head and block off to different places but i want them drilled for 11 stud can this be done?

BENROSS

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Resident Cylinder Head Modifier

Mitsi Evo 7, 911, Cossie. & all the chavs ...... won no problem

1st Apr, 2005 at 10:51:55pm

no problems!

would help matters Considerably! *happy*

its the right way to go.

especially on a high boosted motor

having said that, *smiley**wink*

SOME! would disagree!!!!!!!!*wink**wink**wink**wink**wink**wink**wink**wink**wink**wink**wink**wink*

Edited by BENROSS on 1st Apr, 2005.






t3gav

2395 Posts
Member #: 229
Gavin@minispares.com

kent

1st Apr, 2005 at 11:30:06pm

just wondering how they would line the holes up its not a standard place, spose i could get the head done first then the guys could match the drillings on the block, is it worth it? also why do people retap the gearbox thread to 5/16" is that worth it too?


turbodave16v
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SouthPark, Colorado

2nd Apr, 2005 at 04:49:56am

Every little helps!

Many (myslef included) don't have 11 stud - but no-one can argue it doesn't improve things!

All they do usually is use a Payen gasket as the marker for drilling the head and block! Pretty crude - but works!

btw - you're not srtipping the engine just to do this are you? That would be silly - If you're taking it apart for another reason (or it's already in bits) then crack on!

The 5/16" thing is 'belt and braces' but maybe a little overkill IMO. I'd say simply swap the 'putty steel' standard 1/4" UNF bolts for cap heads (allen key bolts). These are high tensile items, and (almost always) precision made threads.

Going 5/16" means more work in the future whenever you take on a block or gearbox swap...

Another thing to consider - drilling the casing to 8.5mm (clearance) doesn't leave a lot of material around the holes in some areas... This could be considered worse than having a smaller hole and smaller bolt!

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turbo hogster

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stowmaket suffolk

3rd Apr, 2005 at 08:53:00am

miniwilliams uses standard gbox bolts with no probs , a bit to much work for my liking.

always looking for them bigger bunches of bannanas

t3gav

2395 Posts
Member #: 229
Gavin@minispares.com

kent

3rd Apr, 2005 at 09:32:05am

cheers guys, no am going to get the engine fully rebuilt anyway so just thought i'd ask thanks for the replies on the gearbox q too

Tom Fenton
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Fearless Tom Fenton, Avon Park 2007 & 2008 class D winner

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Rotherham South Yorkshire

3rd Apr, 2005 at 05:30:46pm

For Info.....

Cap head bolts have rolled threads rather than the cut threads that hex head bolts have. The rolled threads are a lot stronger due to they way they are formed.


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iain
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Sold the turbo and seeing what the C20XE can do!

Near Lincoln

3rd Apr, 2005 at 05:34:04pm

not saying that you cant get good quality hex head bolts mind with rolled threads and high tensile *wink*

just not as common as cap head bolts

just to clear it up *smiley*
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