EFI Manifolds

[wedge]

Okay, I've currently got a 1.9l with a custom EFI setup.
Basically, it's the original carb manifold that's been drilled and modified, a completely custom fuel rail, a Haltech ecu, bosch injectors, and other such goodies.

I'm trying to improve on this setup, power-wise. And I'm thinking the current manifold is one thing that's holding me back alot.

So, my question is what EFI intake manifolds exist that will bolt up to the 1.9l engine?


I've been asking around already, and have heard that the 2.0 manifold is a good one. I've also heard of a DCOE? manifold, I think that one's got individual throttle bodies. What else is out there?

So what are my options? Has any got any pictures of any of these? Any sources where to get any of them?

[Gumby]

Also a manifold from the 3l straight 6 CIH engine will work if two of the runners are cut off. It will directly bolt onto the 2.2 and 2.4l heads but I think it can be modified to fit a 1.9, I am sure someone will correct me if I am wrong in this.

You can also use the side draft carb manifolds with a throttle body.

[oldopelguy]

Unless you have done some serious port work to the head of your engine you won't be limited by the flow of the stock Opel 1.9 EFI manifold they used here in the US in 1975. It flows pretty well, actually. Add in a throttle body with a real TPS and the fuel rail and injectors you already have on the modified carb manifold and you'll be set.

I do have a sweet weber progressive 2-bbl throttle body that would bolt to your modified carb manifold, though....

[SpringGT]

Wedge, how about posting some pictures of your current injection set-up. It sounds interesting.

[wedge]

Originally Posted by oldopelguy Unless you have done some serious port work to the head of your engine you won't be limited by the flow of the stock Opel 1.9 EFI manifold they used here in the US in 1975. It flows pretty well, actually. Add in a throttle body with a real TPS and the fuel rail and injectors you already have on the modified carb manifold and you'll be set.

Yeah, it's got a set of performance cams (though I don't know what the actual specs are on them), the intake valves are oversized, and the head has been ported. So I'm pretty sure the weakest link in the system is the manifold.


I'd take some pics if I could, but the car is in another province right now, I won't be getting back to it at least for several months. But I want to have all the parts I need, ready to go well in advance.

[RallyBob]

Originally Posted by wedge Yeah, it's got a set of performance cams (though I don't know what the actual specs are on them), the intake valves are oversized, and the head has been ported. So I'm pretty sure the weakest link in the system is the manifold.

If you are in fact running a modified carbureted intake as you say, then it very well may be a restriction.

As the others have said, I'd look for a stock 1975 Opel EFI intake manifold, it flows enough air for 175+ hp, which is more than three times the stock (actual) power of a 1.9 Opel engine! More than enough for any street engine, and enough to feed most racing engines as well. These came fitted to all the North American 1975 Opels....the Manta, the 1900 Sedan (Ascona), and the 1900 Sportwagon.

Opel 1.9 EFI intake.