XU10J4R(S) Project !

[Yohann77]

Hello everyone !

Here is my project, I recovered a XU10J4R and I 'm currently the completely reassembled with RS parts for my 306 1.8 16v

I buy that

I completely dismantled

Engine components were in good condition in general



Rs pistons are placed on rods XU10J4R











The cylinder head is planed and ducts are enlarged and polished

She is assembled with RS camshafts





















New pads











Engine parts assembled and paint 







Rs manifold on the engine head and paint 




assembled







RS exhaust manifold

Following soon !

[Andre3000]

Nice!!!! Good job
Please keep this thread up2date.

[MY95]

Brilliant mate!

[Yohann77]

Thank you ! I start to hear a hurry

Sorry for the thread :/

[Toms306]

Bonjour, tes voiture est tres jolie!

Bon choix de moteur remplacement aussi.

[MY95]

Never knew you spoke French Tom.... or was that Google Translate

[Toms306]

Ha, GCSE French from 2008... It might be all wrong though, his English is most likely better than my French.

[MY95]

I checked it Tom, not bad Not fully correct though

[puggered]

Welcome

A word of caution, If you're using RS cams with R valves and springs, be careful of valve spring bind.
They are right on the limit for handling the extra lift, the RS uses dual springs.

[Yohann77]

thank you tom, you reassure my English is worse than your french , you doing you good!

Thank you to google translator 

Puggered : I kept my single spring XU10J4R you think there is a risk ?

[Eeyore]

So its a gti6 head on a 1.8? Sounds interesting. Good to see someone finally do it.

[puggered]

thank you tom, you reassure my English is worse than your french , you doing you good!

Thank you to google translator

Puggered : I kept my single spring XU10J4R you think there is a risk ?

Measure your full lift, if it's over 9.65mm then there is a very good chance of bind.
I've done the same as what you have but I had to use different springs.

So its a gti6 head on a 1.8? Sounds interesting. Good to see someone finally do it.

It's an XU10J4R head with RS cams not an RS head.

[Yohann77]

The difference between R and R



Left is RS

[puggered]

The cams are not the only difference.
R uses larger inlet valves with smaller exhaust valves.
RS uses thinner valve stems for better high RPM valve speed with double springs.
Better porting in the RS head.
RS uses sequential injection and ignition where the R doesn't.

Unless you plan on using a different ECU then the benefit is virtually 0 btw.

[Yohann77]

Your comment is interesting.

If I find RS springs it will already better right?

My ecu is the factory but there will be reprogramming ..

I changed the R injectors by RS

[Poodle]

Interesting project, there was a lot of discussion on this a few months ago, might be of use to you. I *think* the thread was originally posted by eeyore in the xu section, hopefully that should help you find it.

[welshpug]

RS stems are not smaller than R, they are smaller than the old J4, Mi16.

[puggered]

you can't put RS springs into a R head without machining. The spring seats and caps are different. 7mm vs 6mm. I'm not sure on the valve stem length.

The sagem ECU (if that's what you have) can't handle the cams from the RS properly and although I've never tried, I don't believe you can remap them.
To take full advantage you need to use either the complete RS head, Loom and ECU or the R head with RS cams and stronger valve springs (catcams do some I think) with the RS ECU and loom.
You also need to bore the R head behind the inlet cam pulley so you can fit the cam position sensor. (there is a blank there)

confused yet?

---

RS stems are not smaller than R, they are smaller than the old J4, Mi16.

I stand corrected, Welshpug is right. was getting my J4 and J4R's mixed up

[Yohann77]

For the XU10J4RS:

diameter exhaust stems : 30.8
diameter admission stems : 34.2

For the XU10J4R

diameter exhaust stems : 34.7
diameter admission stems : 29.7

And there as 1mm différence between diameter steems enter R and RS

[puggered]

no, the stems are the same as Welshpug pointed out.

[Yohann77]

Yes it is very clear, thank you 

So if i put the RS ECU (magneti marelli) is better than R ECU (yes it is sagem, mp5.2) ?

[puggered]

better but will still need mapping.
the R uses Bosch mp 5.2 and is not friendly to map.
The 1.8 uses Sagem.
best option would be to use a standalone ECU and run non-sequential injection and ignition.

[Yohann77]

Yes it would be best to put a sybele but $$$ 

[Yohann77]

Hi ! 

I got a be3 / 5 with a differencial in 19x75 .

That is my lab 







  



I have a new clutch 




A new paint and seals and it is mounted

[Eeyore]

that looks amazing! come and do mine! D:

[lolsteve]

If nothing else that's a very fresh looking engine

[Yohann77]

Eeyore :    If one day I just take a trip to pugfest why not !!


Thanks for your comments !

[Yohann77]

Hi 

Today i paint my logo 

[highwayman306]

Yohann, your car is absolument génial

Pur et parfait

I can't wait to see more on this, i don't think I've seen a cleaner engine ....i do own diesel though lol

[Yohann77]

Thank you very much, it is painting that does it all ! I hope he will run as well as it is beautiful