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1137 Posts
Member #: 1450
Post Whore

Near Paris - France

10th May, 2009 at 09:34:45pm

Hi,

I have a 12G295 for a 998 engine but I was wondering if it is OK to swap the double valve spring for some 1275 A+ ones that I have in stock.

After all, my engine is not gonna turn very fast and I understood those double valve spring add friction to the engine, not good for economy ...

Ho, and I promise I searched !

Rusty by nature

On 23rd Jun, 2008 paul wiginton said:
They said "That sounds rough mate." I said "Cheers it cost me a fortune to make it sound like that!"


Vegard

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7765 Posts
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I pick holes in everything..

Chief ancient post excavator

Norway

10th May, 2009 at 10:16:32pm

Double springs are overkill if you aren't revving more than 6000rpm. Especially if a higher than standard cam is used.

Remember that 1275 A+ springs are taller than the small bore ones, but this doesn't necessarily increase the poundage.

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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1137 Posts
Member #: 1450
Post Whore

Near Paris - France

11th May, 2009 at 04:54:05pm

Thank you Vegard.

Tricky question but what do you reckon my peak power rpm might be with my setup ?
(998, 12G295, standart cam, 10 PSI, IC, megajolt)

Thanks in advance

Rusty by nature

On 23rd Jun, 2008 paul wiginton said:
They said "That sounds rough mate." I said "Cheers it cost me a fortune to make it sound like that!"

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