valves

[butchone]

does anyone know of a cylinder head valve supplier who does larger valves? apart from 034

[ManiacuV6]

I heard about FERREA valves. I seen on forum a cylinder head made with these valves.

[butchone]

thanks i will take a look at there website, im after 29.5 or 30mm exhaust valves

[diesel des]

http://www.s2forum.com/forum/showthread.php?t=65107&goto=newpost

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[diesel des]

I ordered mine from fcp engineering. Great deal on supertech and can do.in larger sizes, but that's not needed.

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[Error404]

IIRC from what JP says larger valves are pointless unless you are going to weld up and reshape the ports, something to bearing mind

As above Supertech and Ferrera are some other options to look at

[butchone]

yes lots say big valve heads are not required on forced induction, everyone to there own i suppose. im sure some of the imsa cars had 25v heads on them which kind of contradicts that theory? also high lift cams with stock valves? all part of the magic circle

[Error404]

AFAIK its the shape of the ports that is a restriction, not the valves themselves.
If I were you I would speak to a pro who knows these 20v heads i.e. JP before you take the plunge mate, its a lot of money to spend for no gain

[Sleeper_Avant]

Air flow volume and flow characteristics, purely Dependant on what your engine is going to be doing to produce the power/torque in mind.

25v was all about air flow, Umluft contribution and general use with combined valve overlap, lift and compression contributions

massively different ball game unless you have tropical desires and a lottery winners wallet.

speak to a propper numbers producing engine builder before making an **** of your power delivery, you may be suprised how easily big numbers can be achived with a bit of experience!

[mac2226]

Yes I would recommend you to jp as he told me the exaust side is restrictive on 20v heads with 0.5mm oversized exaust valves then its not good gain on there own but if combined with 3 angle valve then its very good gains

[butchone]

cool will do, thanks men