L jet on 2L heads, how to fit Options

[rfinegan]

How are people fitting the Ljet intake manifolds to work with 2.0L heads? FWIW this will be on my 2056.

[914werke]

I used custom silicone connector hoses

[rfinegan]

So you use the Djet runners on a Ljet plenum? SO it fits the head pattern ?

I used custom silicone connector hoses

[Dave_Darling]

You'd have to use the 2-liter runners. They're shorter than the 1.8 ones, so you need longer hoses to connect to the intake air distributor. (AKA the "plenum".) The runner pipes are the same diameter, or close enough.

--DD

[914Sixer]

Take the 1.8 runners and drill 3rd center hole. You should be able to bolt on 2.0 spacer block on and use it as a pattern for hole.

[TRP]

Will you be running bigger injectors for the 2056? Any other tuning necessary for the L Jet?

[JamesM]

Find a 912e system (IMG:style_emoticons/default/lol-2.gif) (IMG:style_emoticons/default/lol-2.gif) (IMG:style_emoticons/default/lol-2.gif)

Seriously though if you have 3 bolt heads and 4 bolt runners you will have to modify your 1.8 l-jet runners or swap your heads. If I recall the 2.0 runners are going to come up short and in the wrong position to work properly with the 1.8 plenum. You could probably adapt them with soft hose or physically modify them but I suspect using modified 1.8 runners would be a cleaner setup. 1.8 and 2.0 runners are the same ID so you are not losing anything.

[JamesM]

Take the 1.8 runners and drill 3rd center hole.

The other 2 holes will also need to be enlarged as they are in slightly different locations.

[914werke]

So you use the (2.0L) D-jet runners on a Ljet plenum? SO it fits the head pattern ?

I used custom silicone connector hoses

(IMG:style_emoticons/default/aktion035.gif) for good measure I used SS tight seal bolt clamps as well.

[GregAmy]

Genuine curiosity: why? Rebuiliding a 1.8L with 2L heads and that's what you have? How will you tune for the airflow difference?

My interest comes from the FI system. I've got Microquirt on my 2L using DJet induction and I've been curious of the LJet induction would flow more air (I would not use the MAF). I thought about getting an LJet induction and trying it out.

[rfinegan]

@GregAmy , This will be and after market EFI crank trigger system purchased here.(Eltromotive/clewett) Im think the 1.8 manifold holes can be tig welded up and a center hole added to the flange. Making for a Clean OEM looking system with little fabe work. After its up and running a larger Throttle body can be added with a bolt on Go Westy? We will see how this goes. I am mostly done with the heads as we work on getting the 2056 sealed up again

While I have the welder out , i may as well add an O2 bung to the Bursch/SS HE exhaust too

[rfinegan]

Thanks every one for the intake tips....no more syncing or idle jet cleaning for me.... moving forward

[914werke]

In my case it was a 2056 that I fitted a GoWesty TB L-jet kit to & also applied the intake air mod proven and documented by Deming oh so long ago.

[GregAmy]

Good info...so it appears the LJet is the preferred induction? I might just sit back and watch and then maybe give it a go...

[ClayPerrine]

I have run L-Jet on a 2.0 engine. The runners are shorter, and you need longer hoses. That's it. It will bolt on and run.

Now I suggest three things.

1. Bigger throttle body. The factory throttle body for a 1.8 is way too small for a 2.0, much less a 2056. I used a 2.1 vanagon throttle body, and that woke the motor up big time. But they are getting harder to find, so the GoWesty throttle body is a good solution. It just doesn't look as stock.

2. Remove the snorkel on the air cleaner. The end of the snorkel is the same size as the stock throttle body. So the snorkel has the same restriction. If you really want to get radical, cut holes in the bottom of the air filter box. That will improve the airflow into the AFM.

3. Replace the injectors. Get injectors for a 1980 Datsun/Nissan 280ZX. Nissan used a license built copy of the Bosch L-Jet on them, and the injectors are slightly bigger than the stock 1.8L injectors.

Hope that helps.