cfm?, 74 2.0 8:1 Options

[CG-914]

Hi everyone,

I have a 74 2.0 with the euro pistons. (Compression 8:1)
My question what is the cfm on those?
Does anybody maybe has the formula?

Thank you! (IMG:style_emoticons/default/pray.gif)

[Valy]

The max RPM is mainly dependent on your valve springs and engine balance.
The harder valve springs will ensure that the valve close hast enough at high RPM to prevent "valve floating".
Engine balance will save you from braking something at high RPM due to extensive vibrations.
You power band is highly dependent on the air flow (for a given valve geometry). The air flow is limited by the heads but also by your intake system. Stock FI will not pass much more air then the heads can. If you switch to carbs, you can get more air flow assuming you get some 40 or 44mm double webers or solex.
Since you bought the 9550 I assume you have stock. Your power band will not be supper high but your torque will be at relatively low RPM. You probably don't care much about peak power unless you're racing your car at 5000RPM all day long. For street use, the low band torque will put that smile on your face and smoke the Geo standing next to you at the stop light.

Last I know, the 9550 was delivered with WBX springs that are a bit harder than stock and also a bit cheaper. This should allow you to pull the engine up to about 6000RPM but you're not getting more power by doing so.
Hope it helps.