Cylinder Head Identification

[petert 549]

I need help identifying a cylinder head. I've never seen a casting like it before. Head A is a regular D6B, with standard size, stainless steel valves. Head B is bare and measures up with standard size Ø41.6mm inlet seats. The shape of the chamber is weird though. It has had a heavy skim, but look at the bulge, where normally it's wedged. Any ideas?

[jord294 87]

1.6 early head?

[petert 549]

2 hours ago, jord294 said:

1.6 early head?

Maybe. I know early heads were small valves though. The date on head A is '87. I can't decipher the date on head B.

[Thijs_Rallye 86 4 Cars]

It looks like the combustion chamber has the shape of the group A cylinder head. Page 22 of the attached PDF.

205_Group_A_1.pdf

[DamirGTI 323]

Interesting , possibly one of the newer/late XU heads .

 

Such as :

 

XU10J2U RFW engine from the PSA vans Jumper/Boxer etc. , mixture of XU 5/7/9 8v head on a 2.0l 86mm bore iron block :

 

 

 

 

 

 

 

 

 

 

Never took one of those 8v RFW van engines apart , thus no idea what kind of combustion chambers look on those heads (can't find photo of an RFW head off either)  .. possibly might be the one ?

 

8v RFW head has two different valve sizes too - 41.6 inlet / 34.5 exhaust valves dia. , or can be also 42.60 inlet / 34.5 exhaust = strange engine !

 

 

Seems like there was at least 5 different versions of the combustion chambers on a XU 5/7/9 8v heads .

 

I have some weird ones too :

 

Late XU7 LFX head with kinda "swirl" chamber design :

 

 

 

 

 

 

D

[petert 549]

I'd say it's a Group A head for sure. It would definitely be 83.5mm across Section A-A had it not been skimmed. It's 83.5mm across the other axis.  XU10J2 heads are approx. Ø85mm, I have one here. The date stamp is also definitely '87. Interestingly, the valve guides have been re-installed after porting, which has been done beautifully. Definitely a work of art. It also came with a PTS 7048 cam, although worn, but nothing else. ie cam caps, valves, springs etc., have all been lost. I can save it though.

 

[SRDT 146]

There is a BX Sport head by Danielson that is supposed to be close if not the same that the later XU9JA head. There is also the "Kit PTS 125" head for the XU5J and XU5JA that is probably related to the BX head. Is there any yello paint on the outside?

[DamirGTI 323]

28 minutes ago, petert said:

XU10J2 heads are approx. Ø85mm, I have one here.

 

With round or square/cathedral inlet port entry's ?

 

I have too a few XU10 8v heads - XU10J2 and XU10J2TE , they're all round inlet port entry heads , obviously different chambers than XU5/9 , central spark plug position etc. .

 

But this PSA/FIAT van XU10J2U 8v head has square/cathedral inlet port entry , like old XU5/9 heads , and it's bolted on a 2.0l block ! which makes it mixture of XU9 and XU10 ?! .. as said, never seen underside/chambers of that head on a XU10J2U .

 

D

 

 

 

[petert 549]

8 hours ago, DamirGTI said:

 

With round or square/cathedral inlet port entry's ?

 

 

 

It’s XU10J2TE with the round ports etc. I’m going to use the valves etc out of that for the Group A head.

 

No yellow paint, it’s been grit blastered.

Edited October 2, 2021 by petert

[SRDT 146]

Aren't the XU10J2TE exhaust valves sodium filled? Is that needed on a NA engine?

Edited October 2, 2021 by SRDT

[petert 549]

32 minutes ago, SRDT said:

Aren't the XU10J2TE exhaust valves sodium filled? Is that needed on a NA engine?

Probably not, but they're here and available, so they're going in.

[mollisk 2 1 Cars]

Longman group 'A' engines had a similarly shaped combustion chamber, although your head would appear to have been cast with that combustion chamber profile.