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Oversize Valves

 
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Old 01-20-2011, 06:12 AM
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Oversize Valves

I did some searching on here didnt find much on the topic..

are 1mm oversize valves a worth while upgrade if you have your head apart?

logic says they would help a little as they would let more air in and out.

but ive also read quite a few cams cant be used with 1mm oversize valves because of valve to valve clearance. but if that was the case why would companys make them?


If anyone can shed some light on this it would be much appreciated.
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Old 01-20-2011, 01:47 PM
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Re: Oversize Valves

How would oversive valves allow for better airflow? That doesn't even make sense.
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Old 01-20-2011, 05:10 PM
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Re: Oversize Valves

to use oversize valves you have to bore out the valve seats on the head. bigger opening = more flow in and out of the pistons.
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Old 01-21-2011, 12:29 AM
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Re: Oversize Valves

This sounds like a bad idea.
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Old 01-21-2011, 02:57 PM
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Re: Oversize Valves

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Originally Posted by UntoTheCruel View Post
to use oversize valves you have to bore out the valve seats on the head. bigger opening = more flow in and out of the pistons.
Not necessarily. And I would go for more lift, duration or valve overlap if you are looking to go that route. I wouldn't go oversized unles you flowbench a head and test it.
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