2.0l engine with 1.8 heads - what FI set up to use? |
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2.0l engine with 1.8 heads - what FI set up to use? |
Tdskip |
Dec 3 2018, 07:39 AM
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#1
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Advanced Member Group: Members Posts: 3,686 Joined: 1-December 17 From: soCal Member No.: 21,666 Region Association: None |
Counter to popular belief I do not stay up late inventing hairbrained questions for you all, although that is tempting sometime given the wealth of knowledge here. As of around 10:30 AM today this will be a real life scenario.
Let’s imagine I have a 2.0l case running 1.8 heads with a single Weber that runs but I want to convert back to FI. Let’s further image that I have both a 1.8 FI set up and a 2.0 FI set up sitting in the shelf. Which FI set up would I be best advised to use on this engine, and for bonus points and adding to the community knowledge here, why? BTW - planning on doing a tech day on this with/for the SoCal mafia once I get a plan together. Given what seems to be a trend back to FI (or at least renewed interest) I think it could be a useful tech day for the community. Thanks! |
marksteinhilber |
Dec 3 2018, 10:49 AM
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#2
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Member Group: Members Posts: 229 Joined: 18-October 12 From: Foothill Ranch, CA 92610 Member No.: 15,057 Region Association: Southern California |
OK, so your running a 2.0 L case which tells me you likely have 96mm bore, and standard stroke 2.0 L crank, so probably 2056 cc displacement. The 1.8 L heads are the current performance limiting feature, along with the single carb. Between the 1.8 Ljet and the 2.0 DJet, I would choose the Ljet which is a newer design that can accommodate the increased displacement as proven by use in the 912E. Use the Ljet system as is and it will bolt right up to the heads easily. To insure that it runs well with the brain, make sure all components are working properly, has no vacuum leaks, and is hooked up to a !.8 distributor with the same vacuum connections (advance/retard). If forget if it has one or both.
That said, you may be able to bump up performance by switching to 2.0 heads, use 2.0 runners and adapt to the existing 1.8 plenum. Also consider having your throttle body rebuilt and bored to a larger size by on of the vendors on this site. If you increase the max airflow to the cylinders, you should move up to the injectors used on the 912E and plan on checking A/F ratio to avoid a lean condition at WOT. |
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