Hi guys,
Looking for pin to piston top height for 1.2 and 1.4 pistons (1.4 either 16V or 8V)
Also pictures if possible ?

or a pointer to a piston parts catalogue giving these measurements ?

Many thanks,
Cap.

Unless someone has either piston to hand, you might draw a blank on this.

Pistons are only usually quoted via diameter, acurately measured they will be ever so slightly smaller than the bore.

1242cc is 70.8mm bore with a stroke of 78.9mm
1368cc is 72mm bore with a stroke of 84mm

I've never seen a piston listed with an actual crown measurement, even the old Triumphs only listed them as high (domed) and low (flat) crompression pistons.

Goudrons said:

Unless someone has either piston to hand, you might draw a blank on this.

Pistons are only usually quoted via diameter, acurately measured they will be ever so slightly smaller than the bore.

1242cc is 70.8mm bore with a stroke of 78.9mm
1368cc is 72mm bore with a stroke of 84mm

I've never seen a piston listed with an actual crown measurement, even the old Triumphs only listed them as high (domed) and low (flat) crompression pistons.

Click to expand...

Thanks mate, I am aware of the bore size difference, it is simply the pin to top I need, hopefully someone may have one of each - many piston manufacturers listed ALL the sizes in their catalogues, but that was in the paper days lol - I am sure the same happens now, but on line - I just cant find any ...

Again hopefully someone has one of each. ? I am expecting about 2.5 - 3 mm difference with the 1.4 being the smaller.... that is the theory lol
Cap.

Have data for 1.2 now need 1.4 ?

1.2 compression height (pin centre to piston top) 28.00 mm
Bowl depth 5.10 mm
Total piston height 48.00 mm

Critical measurement is Compression height on the 72mm 1.4 piston
thanks,
Cap.

answering my own questions here, but someone may find it useful also...

It would appear that the 1.4 piston has a compression height of 26mm and a total height of 46 mm.

the difference is therefore 2mm.
Stroke is 5.1mm difference giving a differential of 2.55mm....
seems like we would have 0.525mm of piston stuck above the top of the block at tdc which wouldnt be good...
Hmmm, 1.4 complete low mileage engines for 2-300 on flea bay...
A 1.4 panda 8v would be nice..

Having driven 1.2 and 1.4 8v grande puntos back to back, there isn't the performance difference you might expect. The lighter weight of the panda may be more telling though.

gazz_bee said:

Having driven 1.2 and 1.4 8v grande puntos back to back, there isn't the performance difference you might expect. The lighter weight of the panda may be more telling though.

Click to expand...

that is exactly the point. :
I expect the difference to be similar to 1.1 / 1.2 panda, and a very tractable unit.
Also, one cannot really compare in a short time.
I had a 1.1 panda for 4 weeks, now the 1.2 for slightly longer, at first I would have said there was little in them, but now I can say the difference is chalk and cheese, the 1.2 is a Much better unit in this car. No comparison. Much more than 1.4 and I think the fuel consumption would suffer too much. Possibly with an 86 mm stroke it would be easier, just need to find some rods with a 1mm smaller big end and right length.... Or 2mm and 73 bore for 1475. - now that would be fun :devil: