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Home > Help Needed / General Tech Chat > N/A valve sizes when on original centres

adcyork

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Post Whore

York

21st May, 2011 at 10:49:51am

I'm currently spec'ing a head for a project at univeristy and from the flow calcualtions ive done i have decided to go for a 36mm inlet valve with a 30mm exhaust valve.

It's for a N/A engine and the valves will be run on their original centres in a 12g940 casting.
My question is; is there space for this valve size combination when running the valves on the original centres?
thanks
Andy

paul wiginton
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9 times Avon Park Class C winner

Milton Keynes

21st May, 2011 at 11:34:14am

You can fit upto 37.5 inlet with a 30mm exhaust

I seriously doubt it!

Turbo Phil

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

Lake District

21st May, 2011 at 06:55:42pm

Yes no problems, you can fit a 36-31 combination before any offsetting is needed.

WWW.TURBO-MINI.COM


BENROSS

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Resident Cylinder Head Modifier

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

21st May, 2011 at 07:22:19pm

those were the old Cooper S sizes, 36 x 31 and were prone to crack between the seats, before they whent back to 36 x 30, also 35.6 x29.5 at some stage and later 33x 29.5mm layland set for a margin of saftey for them ............ forced induction compouds the larger sizes for reliability!






Vegard

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I pick holes in everything..

Chief ancient post excavator

Norway

22nd May, 2011 at 08:41:57am

The old "S" was 35,6/31. They cracked because the casting was crap. Then they went to 35,6/29,4 and stayed there. The 33,3 inlet was on the inferior models.

You wouldn't want to fit a bigger inlet than 35,6 anyway. No need in anything below 1380 and full race.

On 13th Jul, 2012 Ben H said:
Mine gets in the way a bit, but only when it is up. If it is down it does not cause a problem.
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