88 mm Crank in XU10J4rs

[rny 0]

Hi,
I need to rebuild my XU10J4rs engine due low oil pressure. I wonder how much I will get if I put a

XUD11 88mm crank with S16 rods and pistons?
Or is it better to go standard?

Regards, Robert

[petert 586]

That is definitely the easiest (cheapest) way to do it, otherwise you'll need new rods as well. If you're spending money on rods though, you're better off using K20 pistons and custom longer rods.

[rny 0]

Ok, how much more effect will it give?

[rny 0]

Or what do I win or loose when I’m going for 88 mm crank with S16 Pistons?

[SRDT 175]

9 hours ago, rny said:

XUD11 88mm crank

XUD9, the XUD11 crank is another beast.

 

You can also look for a 2.0 HDI crank:

 

[petert 586]

23 hours ago, rny said:

Ok, how much more effect will it give?

Increase capacity from 1998 to 2044cc.

Increase CR from 10.8:1 to 11:1

Thus more torque and more power everywhere.

[Richie-Van-GTi 71 2 Cars]

Sorry to hijack, what are the options if I have an 88mm crank from a diesel but cant find the s16 rods and pistons? Can i buy some other rods and retain the std pistons or retain the rods and buy other pistons etc? What height difference do I need to reduce by?

[petert 586]

This is how I see it. Others may have other opinions.

 

XU10J4RS Pistons & Rods

Rods are 158mm long and have a pressed pin. This makes them a pain to disassemble and re-assemeble. You could bush the small end, but it would be a smaller diameter and require custom pistons. If you condiser the cost of bushing and new rod bolts, you may as well bought new rods. The pistons have very shallow valve pockets, so you need to spend money getting that altered anyway, if you want to make any sort of decent hp. Once they're out of the engine, you may as well buy new pistons, unless you want originality. Comp height is 34.

 

XU10J4 Pistons & Rods

Rods are 152mm long with a Ø23mm full floating pin. They're easy to re-assemble. The pistons have deep pockets which can accommodate around 0.070" lift at TDC when used with an 88mm crank. Again, once they're out of the engine, you may as well buy new pistons, unless you want originality. Beware that Wossner only sell them with Ø22 pins. Why? Who knows. Comp height is 39.1mm.

 

My advice is to find some XU10J4 rods (I have plenty) and buy new Wiseco 86.5mm pistons from Flatlander. That will be cheaper than K20 pistons and custom rods. Assuming you're not building a race engine.

 

Block height is 235.1mm. Thus

 

43 + 152 + 39.1 = 234.1 (oem)

44 + 152 + 39.1 = 235.1
43 + 158 + 34 = 235

 

Edited February 14 by petert

[welshpug 1,657]

I agree with Peter, find a piston you can make work, get a rod made to suit

 

Beware of the wossner stuff, certainly their gti6 piston is way off their stated compression ratio, its almost as if they took the S16/mi piston and adjusted the pin height only, it has to be why so many dont make good power or last long, they ping their tits off from running so high a compression figure unless you have a good mapper.

Edited February 14 by welshpug

[Richie-Van-GTi 71 2 Cars]

Shopping about and looks like i wont get anything under £600, been a while since i looked into these kinds of things. Seems to have got a lot more expensive.

[welshpug 1,657]

Sounds about right, my robson rods were £580+vat a few years back.

 

I dont think stuff has gone up that much.