2.0L FI limits

[abe914]

Hi,
Is there anyone out there who is running a larger crank (say a 78mm) and utilizing the stock 2.0L fuel injector system?
If so, what kind of performance are you having? Don't want to start a FI-Carb
battle, just wondering?
If the 2.0L system is limited and can't cope with this set-up, who makes a better "mouse trap" fuel injector system.



------------------
Houston in Louisiana

[John Rogers]

The stock system is good to about 7000 RPM on a 2.0l engine. It runs out of air/fuel moving capacity above that sort of a soft rev limiter? I have seem a couple of examples of 2.2l engines with the FI WEB cam and larger injectors and they work okay but they could have made more power with an aftermarket system. After market FI systems seem to be more expensive than carbs and check out the links on http://sandrail.com/manufact.mv as there are several FI makers for type IV engines listed there. Good luck.

[Dave at Pelican Parts]

I know someone locally who has a 2.2 liter that is running a "tweaked" D-jet FI. He reports zero problems so far with it.

The stock FI actually doesn't time the injector pulses very well at all. As a matter of fact, since it fires the injectors in pairs, one injector of each pair squirts fuel at its intake valve when that valve is opening. The other one in that group squirts at a closed intake valve. The fuel sits there in the intake port until the valve opens to let the mixture into the combustion chamber! Changing that by a few degrees won't have much if any effect.

Futhermore, I cannot see how changing the stroke of the crank would have any effect on the valve train. After all, the valve train works purely off of the rotation of the camshaft. Simply putting in a long-throw crank wouldn't have any effect on the camshaft unless you installed the crank wrong.

It can be done, and it can be made to work at least for a mild 2.2 motor. You might wind up close to "maxing out" the injectors when running at high load and high RPM. Higher-flow injectors would be needed at that point. You could also bump up the fuel pressure a few PSI, which meters more fuel per unit time injector opening, but that only goes so far.

Good luck!

--DD