Fiat 2.0 twin cam engines

"Guide to modifying the Fiat twin cam"

The Fiat twin cam design has featured in the winning car more than any other in the history of the world rally championship (as of 2017).

The Fiat twin cam engine as fitted to the 131 Abarth Rally version featured an innovative engine showing the potential of this great engine block.

It featured in many models including

  • Fiat Spider 2000/131/132
  • Fiat Argenta/Strada/Ritmo/Regata/Croma/Tipo/Tempra/coupĂ©;
  • Lancia Beta/Delta/Prisma/Dedra/Thema,
  • FSO Polonez

It has been supercharged, turbocharged, fuel injection and there are many fans of this engine still quite active today. The Fiat Twin cam has, and rightly so, garnered a great following for itself.

The Twin cam design, fed by a double downdraught Weber 34 carburettor produced 137bhp at 6400rpm.

Tuning the fiat twin cam

You can't beat a decent Weber twin 40 setup pushing up power to around 140bhp. They may be fiddly to setup but when running right you get the perfect sweet spot.

Cam upgrades are the next best upgrade when you consider the power benefits to cost ratio.

Head swaps are worth considering as some engines were designed to produce more power from the factory and head design was one of the most significant differences.

Check that the starter motor will still fit and everything lines up with the gearbox.

Whilst you have the head off it's well worth getting it flowed, ported and polished. A 3 or 5 angle valve job will assist with fuel atomization and build more low end torque.

Engine power ranged from 106 bhp to 137bhp on the NASP engines, the turbocharged units produced 182bhp to 214bhp from the factory.

Adding forced induction will make a much higher power gain, but you need to get the fuelling spot on.

Superchargers are easier to add than a turbocharger. If you want to add forced induction you need to adjust the compression ratio. A set of low compression pistons/crank will help achieve this aim.

The addition of fuel injection to these engines made a substantial difference to power and fuel economy.

Aftermarket solutions from Megasquirt and Haltech have been used effectively on the Fiat Twin Cam engines.

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