Does anyone happen to know if they are the same spec. I.e. Have they both got nitrided cranks or is it just the turbo that got them. Rods the same? I'd imagine pistons are different. Top end - exhaust valves are probably sodium filled on the turbo, and i believe the valve guides are only cast iron on the n/a.
Thanks for any info.
Guy

Hi
Its the same crank and the same head, sodium filled exhaust valves on the turbo (ive heard they stopped using them in the last 16vt engines not sure tough) There are people running upwards of 300bhp turbocharged on stock na heads. Piston is different, not sure about the rods.
Someone will be along shortly to fill in

Thanks Brickfoot. Trying to be future-proof and get some spare cranks for my integrale.
Guy

pistons are different (but can be machined to reguired compression ratio ), sodium cooled ex. valves too,


crank - 102kW NA vs. turbo are same, but older design (tipo 107kW)has more drillings at crankpins to provide better lubrication of connecting rod bearing...

engine blocks - are almost identical, turbo one has some outlet, 107kW has at that place threaded plug. 102kW block dos not have it...

crankshaft Fiat are not nitrided ,only Lancias at my knowledge
and with coloured signs to couple the bearings perfectly
i bought new one of the lasts available from non official source

Well, that is just incorrect. Fiat and Lancia cranks are both nitrated.

I was told lanica, fiat coupe 16vt and q4 were nitrated

Great info honza, thanks! Pistons and rods aren't a problem as i would be swapping for race items anyway. Ideal, this info has potentially saved a good coupe 16v turbo. Now i can buy a scrap n/a and sell on the 16vt that i was thinking about scrapping just for the engine (very good car apart from the bonnet, front bumper and a little surface rust on the rear arch lip).
Guy

i owned fiat,lancia and an alfaromeo crank from twin spark
all are heat treated, but lancia and alfa have a stronger one
that i assume is nitridation, try to drill an alfa or lancia
is a nightmare, this is my experience

Burnbike..

I don´t know what you have, but I have at my stock lot of lampredi 8 and 16V engines and some strategycal V6 busso parts (almost 20 complete engines dissassembled and cleaned...) waiting for "worse times"... parts like piston and rods are scrap - but the rest of the engine should be saved...

2ltr DOHC cranks are SAME (instead of mentioned additional drilling on early ones)

heat treatment is the same, everybody who tried to fully clean the crank channels and replaced the original plugs with threaded one knows:) these cranks are very hard and to create M12 thread for plug is little bit nerve wrecking...

blocks are same - instead of addittional plug on early NA, which is in same place as some pipe on turbo variant

-only difference is way of oil spraing of the pistons.. new ones have oil sprays fed from the main gallery, older ones have sprays on rods (especially 8V NA) , some has in main bearing small pipe..


alfa romeo TS (the new TS, 16V) are all cast cranks and these are rubbisch in comparison to lampredi 2ltr 16V crank..

I rebuilded my 1.8 16V engine in stilo to 2Ltr by use of 2Ltr TS crank and stilo abarth pistons so I know...what is better on that engine is that this TS based engine is by 30kg lighter and little bit smaller...ang has also lighter pistons with lower compression height and lighter rods..

yes sure fiat better than alfa