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.
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