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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: Valve sizing (4A upsize)
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Thu, 03 March 2005 12:05
 
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so what will give you a greater (unshrouded) circumferential area when the valve is half open? 1mm lift, or 1mm diameter?
is there any reason not to run 10 or even 11mm lift (i have 11mm lift in my crappy 4K  )
have you thought about increasing the opening of the valve seat without actually increasing the valve head size? i made my valve seat openings about 1.5-2mm larger diameter but left valve head at original size.. dodgy dremel grinding but something else to think about. mow much non-seat area is there on the valve seats already? how much is needed for the venturi?
if you are keen to do it, don't worry about what people say.. you will find it either does work, or it doesn't.
if you are chasing 200+hp then i hope you are seriously looking at a strict weight reduction program.. the higher you rev, the bigger the parasitic losses and thrashing becomes... just think of the beams 3SGE and follow that mould 
i am keen to hear how your bigger valves go!
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| | Subject | Poster | Date |
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Valve sizing (4A upsize)
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takai | Thu, 03 March 2005 07:01 |
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Re: Valve sizing (4A upsize)
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oldcorollas | Thu, 03 March 2005 07:08 |
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Re: Valve sizing (4A upsize)
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Bill Sherwood | Thu, 03 March 2005 12:13 |
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Re: Valve sizing (4A upsize)
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oldcorollas | Thu, 03 March 2005 12:18 |
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Re: Valve sizing (4A upsize)
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takai | Thu, 03 March 2005 07:11 |
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Re: Valve sizing (4A upsize)
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IRA11Y | Thu, 03 March 2005 07:31 |
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Re: Valve sizing (4A upsize)
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takai | Thu, 03 March 2005 07:41 |
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Re: Valve sizing (4A upsize)
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fergo308 | Thu, 03 March 2005 11:21 |
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Re: Valve sizing (4A upsize)
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takai | Thu, 03 March 2005 11:54 |
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Re: Valve sizing (4A upsize)
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Meat_rack | Thu, 03 March 2005 12:01 |
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Re: Valve sizing (4A upsize)
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oldcorollas | Thu, 03 March 2005 12:05 |
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Re: Valve sizing (4A upsize)
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takai | Thu, 03 March 2005 12:11 |
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Re: Valve sizing (4A upsize)
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fergo308 | Thu, 03 March 2005 12:57 |
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Re: Valve sizing (4A upsize)
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takai | Thu, 03 March 2005 13:04 |
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Re: Valve sizing (4A upsize)
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oldcorollas | Thu, 03 March 2005 13:18 |
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Re: Valve sizing (4A upsize)
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takai | Thu, 03 March 2005 13:22 |
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Re: Valve sizing (4A upsize)
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Bill Sherwood | Thu, 03 March 2005 22:46 |
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Re: Valve sizing (4A upsize)
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shinybluesteel | Fri, 04 March 2005 07:18 |
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Re: Valve sizing (4A upsize)
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Anthony Kellam | Fri, 04 March 2005 09:17 |
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Re: Valve sizing (4A upsize)
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FKN16V | Fri, 04 March 2005 22:30 |
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Re: Valve sizing (4A upsize)
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ae86drift | Sat, 05 March 2005 04:37 |
