are the castings the same for both the 1108 and 1242 head?

is there a date stamp on them, if so, where?

plus any other identifying numbers to distinguish the two


thanks

They have a date stamp. But the heads are identical SPI for SPI. Just use an 1100 head gasket.

any idea where to look for the date, there seems to be numbers all over the place!

I was hoping I'd got a photo. But no. Anyway, it's on one of those circular stamp things which they use: dunno which side of the block. I'd not worry about ther date, but about it being SPI and the condition.

I have just bought a replacement head today, due to my original failing [see my other thread elsewhere]

My original head has a "thatched" casting:


My replacement is plain:


I also note, that my replacement head looks like it has been mildly ported, it had a metal gasket still attached to the inlet side, my original head inlet ports are approx 25mm tall, on this one, they are almost 30mm tall, and really smooth inside, pics of the same port on both heads:

Replacement Head [pic upside down!]:


Original Head:


While I am on, can anyone identify this cam - I dont know anything about cams so it could just be a standard one, it has a green band around it between two of the lobes, and the number "176" printed into another area between the lobes:


There is evidence that the head has been skimmed, although by comparing the two its only been done very lightly, I can see the marks left by the machining process

The 176 cam is a standard 1108 item.

Interesting! It would really help if the photos were of heads the same way up!

You might have an Italian or Polish head, rather than a Brazilian one. WTH, if it fits, use it!

chaos said:

The 176 cam is a standard 1108 item.

Click to expand...

Good, I am glad about that, I am not interested in fitting non standard parts, prefer to keep things standard, usually more reliable that way. [says he whose h/g has gone taking the head with it]

Yeah, sorry about the pics being wrong way up!! photgraphy isnt one of my strongpoints!! lol

as 1242 bore is different size? wouldn't the chamber in the head be a different size and create a lip internally on the 1008 block?

Just curious.

Kristian

Dunno. It would be very small though. But worth measuring.

If Blue's original 1100 head is OK following the detonation disasters, I'm about to swap it for Blue 2s 1242 head (Blue's head has about £400 worth of porting and a better inlet mani............

kritip said:

as 1242 bore is different size? wouldn't the chamber in the head be a different size and create a lip internally on the 1008 block?

Just curious.

Kristian

Click to expand...

I think the difference in capacity comes from the stroke, the block is 10mm taller. I don't have a Punto book to check, though.

Cheers

D

rallycinq said:

I think the difference in capacity comes from the stroke, the block is 10mm taller. I don't have a Punto book to check, though.

Cheers

D

Click to expand...

1242 is 70.8 bore, 78.9 stroke
1108 is 70.0 bore, 72 stroke

So, most of the difference is stroke: the 1242 bore is, off the top of my head, about 0.4mm over the max overbore of the 1108.

I'd guess the pistons are pretty different, or they'd not have done it that way................

hello i have just read the threads but i may of read it wrong but isn't the 1242 head different to the 1108 head i.e the inlet port on the 1242 is position differently and the punto 1242 head has a mpi system.
please correct me if i am wrong which i am sure you will.

Ricky

The earlier 1242 Puntos (the 60) were SPI. MPI ones (Punto 75) can be put on, but inlet side is different altogether and it's a lot more involved. The 1108 MPI head is essentially a later version of the Punto 75 one with a softer cam and sequential injection.

cheers for that

Ricky

Are you about to fit a 1242 head on an 1100 block, using 1100cc crank, rod and pistons?

Do you know what you're doing...?


Ralf S.

Ralf S. said:

Are you about to fit a 1242 head on an 1100 block, using 1100cc crank, rod and pistons?

Do you know what you're doing...?

Click to expand...

is that to me? My head must be 1108 as I bought 1108 head gasket kit and the inlet gasket fits perfect, as does the inlet manifold

weather permitting, refitting starts tomorrow

Ralf S. said:

Are you about to fit a 1242 head on an 1100 block, using 1100cc crank, rod and pistons?

Do you know what you're doing...?


Ralf S.

Click to expand...

Are you implying that the 1242 head will give so much power, the 1108 bottom end might be a risk??

if so it wont

It's the same head, fcs!

Looked at the head of foxyemx's 1100 MPI Sei today (I was looking for a date stamp, which I couldn't find). It has "1242" stamped on it!