27-03-2014, 01:12 PM
I know the gti6 and xsi have different size valves and ports, can someone tell me the valve sizes and is there any sort of flow bench comparison between the heads.
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Port/valve sizes
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27-03-2014, 01:47 PM
(This post was last modified: 27-03-2014, 01:48 PM by powerandtorque.)
XU10J4R (RFV):
Inlet valve - 34.7mm Exhaust valve - 29.7mm XU10J4RS (RFS): Inlet valve - 34.2mm Exhaust valve - 30.8mm I don't have the flow graphs to hand, but from memory, the RS head flowed more outright which you'd expect from the huge ports, but the J4R still flows very well. The XU7JP4 (1.8 16v) head is similar to the XU10J4R head but has very restrictive ports, almost as if it was deliberately throttled by Peugeot to put a clear gap between it and the larger engine in terms of output. If you look at them you'll see what I mean.
1990 Peugeot 205 GTi 1.9 // 1991 Peugeot 205 GTi 1.9 16v // 1992 Peugeot 205 GTi 1.9 // 1999 Peugeot 306 HDi Estate
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27-03-2014, 06:03 PM
The 1.8 head is stupidly restricted hence why I've always wanted to put a gti head on a 1.8 bottom end and have it mapped properly. I reckon it will be a cracking engine if you could do so!
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28-03-2014, 11:28 AM
Just rework the 1.8 head. Advantage of those tiny ports is there's plenty of meat around them...
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