2.0 engine differences

[CaptDon]

Why do the 75 and 76 2.0 engines produce less power than the 73 or74? Is it the smog pump and catalytic converter equipped exhaust or are there other internal engine differences?

[Dave at Pelican Parts]

It's pretty much just the exhaust. If you switch over to the 73-74 exhaust, you'll pick up most or all of the power difference between the early and late 2.0 cars.

--DD

[Joe Ricard]

Get a header and make some real power.

[Joe Bob]

The drag from the air pump doesn't help either....

[CaptDon]

Thanks Dave.

I was primarily concerned about the cam profile or if the cylinder heads were different. I plan to rebuild the engine with stock displacement using euro cylinders/pistons, a three way valve job, exhaust header and stock profile cam. This is a track car and the class rules require using the original fuel injection, so a wilder cam is out of the question.

The rules allow port matching, as long as it extends no more than 1/2 inch into the port. Is this worth messing with on a basically stock engine? I have heard stories of people, not knowing what they're doing, actually making heads flow worse after machining the ports.

Does anybody here have any recommendations on a good, yet easy to use air fuel meter? I can weld a bung in the collector for an O2 sensor, but am looking for something that is easy to read, at a glance, while driving and ideally can store information to be downloaded later to a laptop computer. Short of several hours on a dyno that may be the best way to fine tune the fuel injection.

Lastly, I have the original air injection set-up complete except for the piece that hooks the air pump belt pulley to the crank. The rubber was shot on this piece. Are these pieces other teeners could use? If so I'll post it on the for sale board. I don't know how many states require operational air injection pumps on the later street-able 914's other than Arizona.

Thanks again, Don

[blitzer]

From what I have read regarding the stock cam, you can increase your power range and pick up considerable HP from a cam upgrade. Might check with your class rules to see if it is allowed. I'm converting my 76 to the earlier exhaust and have removed the air pump. I gave it to an owner who needed to pass California emmisions.

[Jim Smolka]

If my memory is correct, earlier 2.0 cases had a GA serial number and later cases had a GC serial number.

[Brando]

Look at getting a Cam from Raby that is profiled for your injection system. He has them available for both D-Jet and L-Jet. Both kinds make more power, run cooler and are much better compared to the original cam. Best part is... If it runs with your injection and runs just as good or better than OEM, how could they tell if you switched cams? As far as I knew, if you changed from your original FI setup to carbs, you got dinged from points. Not modifying the oem injection system...