Xu7j4 Info

[Sandy 191]

You have to narrow the small end of the XU7/XU5 rod or mill out the inside of the piston slightly, but yes the Mi16 pin will shrink fit fine (using the heating method Peugeot specify). Pressing it cold will almost certainly damage/distort the piston.

 

If the Turbo engine plan of which you speak is for an 8v, the XU9J2 downdraught head (BX/405) has larger chambers which provide a suitably low CR on the standard XU7J4 pistons. It will need to be ported to give its best, but it's typically more efficient than the GTI 8 valve head like for like, to the tune of about 7-8% power and torque.

[TVH 0]

You have to narrow the small end of the XU7/XU5 rod or mill out the inside of the piston slightly, but yes the Mi16 pin will shrink fit fine (using the heating method Peugeot specify). Pressing it cold will almost certainly damage/distort the piston.

 

Thank You, Sandy! That modification sounds easy enough for me

[Guest Puges]

You have to narrow the small end of the XU7/XU5 rod or mill out the inside of the piston slightly, but yes the Mi16 pin will shrink fit fine (using the heating method Peugeot specify). Pressing it cold will almost certainly damage/distort the piston.

 

If the Turbo engine plan of which you speak is for an 8v, the XU9J2 downdraught head (BX/405) has larger chambers which provide a suitably low CR on the standard XU7J4 pistons. It will need to be ported to give its best, but it's typically more efficient than the GTI 8 valve head like for like, to the tune of about 7-8% power and torque.

 

I mean which pistons i have to use for XU7j4 engine to get low CR?

[welshpug 1,657]

Thanks Sandy

[Sandy 191]

I mean which pistons i have to use for XU7j4 engine to get low CR?

You'd have to use specials if the chamber volume isn't changing.

[Guest Puges]

How much this xu7j4 engine weight?

 

weight without sylinder head?

[welshpug 1,657]

without a cylinder head I would imagine it weighs the same as the XU9j4, the 9JA, and the 5J...

[Sandy 191]

Slightly less than the XU9, pretty much same as XU5, approx 60kg without flywheel or alternator.

[Oberon 0]

This is very interesting Sandy.. I was wandering, in the nailing together of an engine of this type would there be any usable parts from a xud7 td like forged rods or oil sprayers .

 

Forgive my lack of knowledge in such things, and or chatting utter #*^&ocks.

 

The reason I'm interested though is that the thought of maybe one day building a ' tribute ' to the 1.8, 16 valved, turbo'd, monster of the 80's is playing on the imagination..

[Sandy 191]

Not really, the TD engine is entirely different.

[welshpug 1,657]

just a quick one, does anybody know the position of the crankshaft when the cams are pinned?

 

No1 / 4 @ TDC or all 4 mid stroke?

 

or where should the woodruff key or the dot on the bottom sprocket be located?

 

cheers!

[Sandy 191]

Midstroke.

[welshpug 1,657]

excellent thanks.

 

I think someone has ballsed this one up, bottom end isn't quite in sync and its got one of those pulleys like a gti6 uses with the pin hole in a separate outer section that often moves....

[pip470 61]

Mine had moved also on this engine, Strangely mine had moved the exact amount around so that when pinned the No1 was at top dead. Which did throw me. I fitted a solid ally one made for a gti 6 and that put the pistons all midway.

[Guest krizzle]

Short question: Will the xu7 block be straight fit to the 205?

I saw some pictures and the engine mounts looked a little different to the xu9 ones.

[welshpug 1,657]

yes with xu7 mounting bracket and arm (arm is the same as XU10) unsure how well the exhaust fits.