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Home > Help Needed / General Tech Chat > valve springs

minimole23

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Wiltshire

Hi, as a number or peeps here seem to regard the sodium exhaust valves as non essential on a lower power turbo motors. I am going to use a std 1275 head with 35 mm inlets in conjunction with a n/a mg metro cam for my turbo build.

What valve springs should I use with this cam? I will be revving to no more than 6400 ish, with 8 ish psi of boost. Is there anything else I should take into consideration?


Thanks.

On 7th Oct, 2010 5haneJ said:
yeah I gave it all a good prodding


robert

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6753 Posts
Member #: 828
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uranus

prob 180 lb mini spares ones .

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM


wil_h

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9258 Posts
Member #: 123
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Betwix Harrogate and York

It's common to make the valve to guide clearance a bit bigger than standard on the exhausts, to reduce the chance of them binding.

Ask Benross for guidance.

Fastest 998 mini in the world? 13.05 1/4 mile 106mph



On 2nd Jan, 2013 fastcarl said:

the design shows a distinct lack of imagination,
talk about starting off with a clean sheet of paper, then not bothering to fucking draw on it,lol

On 20th Apr, 2012 Paul S said:
I'm mainly concerned about swirl in the runners caused by the tangential entry.


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

The Minispares ones seem to be a good choice, 180lb will be fine for your application. Guides need to be reamed with a 9/32 reamer after fitting.

WWW.TURBO-MINI.COM


BENROSS

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9812 Posts
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Resident Cylinder Head Modifier

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

i agree minispares 180 pound Double springs part number 526 springs ask jim at minispares north

the pressure is 238 pound on the nose
springs are capable up to 8000 rpm






minimole23

4309 Posts
Member #: 1321
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Wiltshire

Thanks, thats that cleared up:)

On 7th Oct, 2010 5haneJ said:
yeah I gave it all a good prodding

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