[bbcamaro]

Sorry to start a thread that probably already exists,but I'm seeing conflicting answers. Is it an advantage/possible to use the 1.8L intake cam in the 2.0L? from what Ive seen,there is an icrease in power. What else is needed? What sprocket to use? ECM? Running a 2003 Tib 2.0L on asphalt 1/4 mile circle track. Can't use aftermarket cam,but can likely get away with a stock cam swap if it has any advatage to it. Any other tips?TIA.

 

[wokko_7]

1.8 intake cam in my beta 1 2.0 does allow it to rev higher in 1st and 2nd gear which in turn gets off the mark much quicker than before with the 2.0l cam.

 

[bbcamaro]

Wouldn't mine be classed as a beta II?

 

[wokko_7]

they have the same head between beta 1 and 2 even 1.8lt

 

[427troy]

they have the same head between beta 1 and 2 even 1.8lt

That is so not true! Valve stem lengths, and the difference of hydraulic vs flat lifters being the largest differences. The heads interchange on the blocks, but that does not make them the same head.

 

[geezer101]

G4GM 1.8 Beta I and G4GF 2.0 Beta I engines share the same head but different cam profiles. The 1.8 has a more aggressive lift and duration cam to compensate for the lower engine capacity. The G4GC Beta II 2.0 is a solid cam head (no hydraulic lifters/lash adjusters) that uses VVT. The cams are not interchangeable between Beta I and Beta II - the cams use different timing gears that cannot be swapped and the valve stem lengths are also different between head types. The biggest issue with the Beta I heads is airflow on the intake side. The intake ports themselves are heavily restricted which makes them good for low down torque but hopeless for top end performance. The Beta II has bigger ports, but the cams are lousy and it relies on the VVT function to compensate for lift and duration.

In short - for a rev happy engine, use the G4GM 1.8 with porting and headers. For a torque-y engine with extra HP, use the G4GF 2.0 with a G4GM intake cam + porting + headers.