306oc - Peugeot 306 Owners Club & Forum

Think this is the correct place for this thread (please move if not).

I was just looking on Wikipedia about the XU engine and it says under the XU10 that there are two different types of XU10J4 for the 306 S16 (and ZX 16v). They are:

XU10 J4D/Z / RFT 150 PS (110 kW; 148 hp) 16-valve DOHC catalyst models: Citroën ZX Coupé 2.0 16v
Citroën Xantia I 2.0 16v
Peugeot 306 S16
Peugeot 405 mkII (1994 on)

and then the:


XU10 J4/L/Z / RFY (Mi16)[4] 152 PS (112 kW; 150 hp) 16-valve DOHC catalyst
Models: Peugeot 405 2.0 Mi16
Citroën ZX 2.0
Peugeot 306 2.0 S16

I was under the impression there was only one type of engine for these models, with the Mi16 head. The first one doesn't say Mi16 but is still 16v. I can only find pictures of the XU10J4 for these models with the Mi16 head and plastic manifold.

Any ideas? Just curious really!

It is correct in that there are RFT and RFY variants of the XU10J4 2.0 Mi16/S16 engine.

I'm not 100% sure on the exact difference between the two though.

The only differences in the XU10J4 engines that I know of is that very early ones don't have a windage tray and not all of them have the cam driven vacuum pump. I imagine that it's a mapping difference, possibly for emissions related reasons, but that is just a guess.

Obviously the XU10J4 is quite different to the later XU10J4R and XU10J4RS engines!

Far as I'm aware - this was the changeover from a non-cat engine to an engine with a catalytic converter.

The 148hp engine is the one with the cat, the 152hp is the one without the cat.

As I understand the mapping is a bit different also.

nope, all xu10's had cats.

youve confused yourself with the 1.9, the d6c 10.4-1 160 bhp engine non cat running ml4.1 or m1.3, and the lower comp 148 knock sensor and lambda equipped cat engine, dfw code.

xu10 is identical other than mapping as far as I can tell.