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what port sizes on yb for 550 hp ?

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Old 22-05-2008, 01:51 PM
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scoooby slayer
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Default what port sizes on yb for 550 hp ?

is 25mm big enough ?
Old 22-05-2008, 03:03 PM
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Ima Racing
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26mm in and 25mm out
Old 22-05-2008, 03:15 PM
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Mike Rainbird
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Mine is bigger than that for less power... .
Old 22-05-2008, 03:15 PM
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so a 25/25 could make 520 ish at best.
Old 22-05-2008, 03:21 PM
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i suppose with a bd16 cam im gonna get more air in per cycle than a bd14 so thatl increase bhp to.
Old 22-05-2008, 03:21 PM
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..mike doesnt the port size affect torque?...Being bigger when its not needed is silly isnt it?
Old 22-05-2008, 03:26 PM
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i just wana get 2.2 bar in it from a t4 without any caping to stop surge and the highest inlet cam i can get with a r & b motorsport swedish inlet and see what i can get top end bhp. and the head not to be a restriction.

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Old 22-05-2008, 04:49 PM
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Well 450lb ft @ 5000rpm @ 2.2 bar, doesn't seem too big to me . Mine is also only a baby engine (60 trim T4) and makes less than 550bhp . I think some people underestimate the porting required to achieve the power they want....
Old 22-05-2008, 04:52 PM
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JonnyBravo
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Mike did you get my PM ?
Old 22-05-2008, 05:02 PM
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Mark Shead
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You will struggle to get much over 500hp on 25mm and a T4 and just about impossible to see 550hp on a T4 unless you have a trick engine,
I have seen 707hp on 26mm inlet ports but no T4, You poss could get 550hp on 25mm if you have a GT35.

Mark
Old 23-05-2008, 07:09 AM
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Originally Posted by Mark Shead
You will struggle to get much over 500hp on 25mm and a T4 and just about impossible to see 550hp on a T4 unless you have a trick engine,
I have seen 707hp on 26mm inlet ports but no T4, You poss could get 550hp on 25mm if you have a GT35.

Mark
thanks mark i dont wana miss a head if it comes up i need to be looking for a 26/27 head then. will 25 be ok for the exhaust side ?
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