"fiatinc" pistons and other parts

[andyp250f]

Hi all, as stated in a previous post, I have bought an ex-Florida spider. All the smog gear has previously been removed, and as I am in the UK, a few mods are in order. The car was manufactured in1979, so as far as UK emissions go, its more or less on a par with a current middle east steelworks. Good for me, not so good for the planet. Anyway, I think, but please correct me if I'm wrong, that the compression ratio on a 2.0 litre is 8.3:1 or thereabouts. I noticed that an American company do a set of pistons that take it to 9.8:1. Thats Ok here, we can still get 99 or 102 octane. I was wondering, are they a good company to deal with, or is there someone you can recommend for pistons? I ought to say that my enquiries so far in the UK have resulted in quotes around the £600 per set mark. Ouch. I look forward to hearing your suggestions.

[So Cal Mark]

I'd ask the mfg what the height of the dome on the piston is and whether they are cast or forged pistons. Some people are selling pistons with a much higher compression ratio than what is advertised

[djape1977]

CR also depends on what head you currently have on your engine. same pistons may give diferent compression with diferent heads

[sptcoupe]

Mark is correct. There are some soirces selling pistons with 8mm domes that are advertised as 9.8:1 CR. I have never put them in a motor that didn't end up having CRs of over 11.5 and higher. I ahve sound that in a 2.0L with a 2.0L head a 4mmr even a 3.5mm dome will get you 10.1:1 or so.

[andyp250f]

thanks for the replys. The pistons have a dome height of 4.5mm. Not sure about cast or forged. I might call them later, and apart from anything else, find out what the carriage would be to the UK.

[baltobernie]

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