hi all!
Been getting lazy with the turbo thread, will hopefully get some updating tomorrow, add some new pics etc. haven't had much money this month, was gfs birthday, tax was due etc.

which kind of leads me on to my next question, I have a complete head set for the 1242 8v spi engine, can i use this head set on an 1108 8v spi engine?

Many thanks in advance!

Lenny

I have looked at an 1100 and a 16v head gaskets and found slight differences in some of the water/oil transfer holes.
The 16v has a small bead of rubber round the gasket outer edge and center oil transfer hole so looks to be a better one than the 1100.
You would have to lay the 1242 one on the block to check but if it's ok then the 16v one might fit also.

id say no as the bore size is wrong for one, but could be wrong?

Bore size is same, stroke longer on 1242.
16v may have extra waterways near outer part of cylinder block?

cc1 said:

Bore size is same, stroke longer on 1242.

Click to expand...

nope 1108 bore is 70.0mm
1242 is 70.8mm

dave said:

nope 1108 bore is 70.0mm
1242 is 70.8mm

Click to expand...

I measured the ones I've got and they where the same. 1100 and 1242-16v??

The mthfkers must have give me the 1242 8v one n not the 1100.

Just an idea.:idea: But..
I wonder by how much, fitting a 1242 gasket on an 1100 would lower the compression by??

SlinkyCinqi said:

I have a complete head set for the 1242 8v spi engine, can i use this head set on an 1108 8v spi engine?

Click to expand...

Some of you guys have been quoting 16v specs and comparisons, the poster clearly says 1108 8v and 1242 8v

so theres nowt to do with 16v here!! unless he meant the 16v 1242 by mistake?

sorry, no offence, I just wanted to point that out.

nah i meant the 2 8v engines, I think 16v was just mentioned as cc1 has personal experience of trying to interchange these gaskets. Anyways they are different gaskets judging by part number, so probably due to the bore and possibly different waterways.

Thanks again everyone

Lenny

only the bore should be diffrent, the water and oil holes should be in same place

I mentioned the 16v gasket as it appears to be a better design than the 1100 ones I've had in the past.

Because alot of the things poeple do to cars on the forum are not of manufacturers original design, then experimentation is part of the game.

The 16v gasket is designed to run on an engine with more power and c/r as standard than the 8v and because of it's slightly larger bore dimensions would help reduce c/r for a turbo aplication.
The standard pistons in a n/a engine are not designed for turboing but poeple still use them, so anything to improve reliability is worth looking into.

Only difference between the 16v and 8v is an elongated hole for oil pressure to the hydraulic tappets.
See pic



http://i105.photobucket.com/albums/m232/davethetrike/102_0340.jpg

davethetrike said:

Only difference between the 16v and 8v is an elongated hole for oil pressure to the hydraulic tappets.
See pic

http://i105.photobucket.com/albums/m232/davethetrike/102_0340.jpg

Click to expand...

Any idea if the elongated hole would cause a problem when linked up to a 1108 head?

The elongated hole probably wouldn't cause problems, as long as it matches up with the hole in the 1108 head.

BUT, seems to me that if the 1242 gasket is a touch wider, that would introduce a sharp edge (the cylinder wall) into the combustion chamber and possibly a nice starter for pre-ignition.

The SuperFIRE gaaskets are probably the ones to go for for better NA performance.

fingers99 said:

The elongated hole probably wouldn't cause problems, as long as it matches up with the hole in the 1108 head.

BUT, seems to me that if the 1242 gasket is a touch wider, that would introduce a sharp edge (the cylinder wall) into the combustion chamber and possibly a nice starter for pre-ignition.

The SuperFIRE gaaskets are probably the ones to go for for better NA performance.

Click to expand...

I was thinking that the superfire gasket was the best choice, but this idea of a lip being formed by the bore differences makes me wonder - had seen commments that dismiss it being a problem so not been too worried about it. I had heard that the later 1108 mpi 8v & 1242 mpi 8v heads are the same - take it the bore would have to be different on the head & it would be that which would therefore create a .4mm lip around the inside.

I know it'll all make more sense when I have it sat in front of me, but was trying to weigh up the pros & cons of using my 1108 head instead of the 1242 8v mpi one. I do wonder if using the latest version 8v mpi with the cam sensor would mean an easier matchup with the ECU?

Smiler121 said:

I know it'll all make more sense when I have it sat in front of me, but was trying to weigh up the pros & cons of using my 1108 head instead of the 1242 8v mpi one. I do wonder if using the latest version 8v mpi with the cam sensor would mean an easier matchup with the ECU?

Click to expand...

From the POV of the head, there's no difference between a late MPI 1242 or MPI 1108.

Indeed, the head from Emma's old MPI 1108 Sei has 1242 on it!

So as long as I go for a gasket with the correct bore for a 1242 then I should be OK if using a 1108 head?

Sorry if I keep asking similar things over again on various threads, but am struggling to come up with a conclusive answer & am trying to avoid throwing away ca$h buying various gaskets to compare myself, also trying to avoid having to have my head off for any longer than necessary.

I thought that the title of SuperFIRE engines was exclusively used for 16v, yet have spotted a few mentions of SuperFIRE 8v around?

Smiler121 said:

So as long as I go for a gasket with the correct bore for a 1242 then I should be OK if using a 1108 head?

Sorry if I keep asking similar things over again on various threads, but am struggling to come up with a conclusive answer & am trying to avoid throwing away ca buying various gaskets to compare myself, also trying to avoid having to have my head off for any longer than necessary.

I thought that the title of SuperFIRE engines was exclusively used for 16v, yet have spotted a few mentions of SuperFIRE 8v around?

Click to expand...

If using 1242 block, get 1242 head gasket. If using 1108 block get 1108 head gasket. Remember, though, that the other gaskets may vary depending on the head you use. Fluffy will sell you the gaskets seperately.

The very latest 8v are superFIRE with coil per cylinder, fly by wire and the braced main bearings and alloy sump. Your local FIAT dealer may let you take a peek!

Hmm .. i'll got a bit confused here,

IS superfire:

16v
MPI

OR is there now 8v superfire engine?

And is the superfire engine twincam ???

Thanks
Ming

Ther are 8v and 16v Superfire's. The 16v are naturally DOHC (how could they realistically be anything else?).

Distinguishing features: alloy sump, coil per cylinder, yellow oil filler, metal HG.