 914 2.0 1973, convert back to fuel injection |
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| theghoul |
 Apr 5 2021, 12:57 AM
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#1
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Newbie  Group: Members Posts: 5 Joined: 5-April 21 From: cleveland ohio Member No.: 25,401 Region Association: None  |
Hi! nice forum - mainly have the front engine Porsches, but am helping a friend with a 914 2.0 he bought that had a single carb conversion, and I believe it is best to go back to the fuel injection. He has an extra motor with fuel injection but not sure it is a 2.0. Has the ECU- I know it needs to be a 13 or 14 and dont know that yet. He has the wiring and the intake tubes and injectors - any pitfalls to this job? Any info is appreciated! thanks, theghoul
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| Arno914 |
Apr 5 2021, 03:50 AM
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#2
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Member Group: Members Posts: 233 Joined: 13-May 20 From: Southbridge, MA, USA Member No.: 24,260 Region Association: North East States 
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| BeatNavy |
Apr 5 2021, 05:07 AM
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#3
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Certified Professional Scapegoat Group: Members Posts: 2,962 Joined: 26-February 14 From: Easton, MD Member No.: 17,042 Region Association: MidAtlantic Region
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Here's another resource that's 914-specific: https://members.rennlist.com/pbanders/DJetParts.htm. It will help you determine which components you have by PN and/or appearance.
If there's a single carb on there it's probably safe to assume they never cracked open the case and put a non-FI friendly cam in there. First "pitfall' I can think of is that you really need to source the components from same year setup. While 2.0 FI D-Jet is largely the same across the years, there are a couple of significant differences. You can put a '73 2.0 D-Jet on a '74, for example, but you mainly want to ensure that key components match up together -- primarily ECU, MPS, and CHT (but also throttle body and distributor). That link above has that info. Make sure the distributor is also D-Jet compatible for the year. It needs to have the trigger points and trigger point connection. Another thing is just making sure the individual components are serviceable. I'd consider sending out the injectors for cleaning/testing and doing individual tests on things like the MPS and CHT. Getting the vacuum lines hooked up properly can be a little fun, too, based on the little idiosyncrasies of different parts/setups. Same thing with fuel lines. You'll need a high-pressure FI fuel pump -- either stock 3 port or simplified, new 2-port. Jeff's site has great reference info here: https://bowlsby.net/914/Classic/TechNotebook.htm I'm sure there's more...but I think it's a worthwhile effort (hopefully). Properly functioning D-Jet is a great, reliable system, but it does take time and effort to get the gremlins out of a 50 year old setup that may have been hacked around a bit. |
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| rick 918-S |
Apr 5 2021, 05:46 AM
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#4
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Hey nice rack! -Celette Group: Members Posts: 21,239 Joined: 30-December 02 From: Now in Superior WI Member No.: 43 Region Association: Northstar Region 
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(IMG:style_emoticons/default/welcome.png) best move is to go back to FI. When I did 7 of 9 I sent the engine harness to Jeff Bowlsby and had him test and repair it. He can fix any bad or brittle wires and install all new boots. takes all the guessing out of trouble shooting any issues with the rest of the system.
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| burlybryan |
Apr 5 2021, 08:09 AM
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#5
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Member Group: Members Posts: 148 Joined: 25-May 20 From: Saint Paul Member No.: 24,311 Region Association: None
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Helpful info here. I'm doing the same thing to my carb converted 74 2.0 and recently acquired all the FI components from a running 74.
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| mepstein |
Apr 5 2021, 09:52 AM
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#6
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914-6 GT in waiting Group: Members Posts: 20,587 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region
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If I had a four I would switch it to PMB's new FI system.
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| burton73 |
Apr 5 2021, 11:30 AM
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#7
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Senior member, and old dude Group: Members Posts: 3,989 Joined: 2-January 07 From: Los Angeles Member No.: 7,414 Region Association: Southern California
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QUOTE(mepstein @ Apr 5 2021, 08:52 AM)  If I had a four I would switch it to PMB's new FI system. Eric says this is the set up Bob B |
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| MikeM |
Apr 5 2021, 12:10 PM
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#8
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Senior Member Group: Members Posts: 564 Joined: 16-May 10 From: Calgary, Canada Member No.: 11,733 Region Association: Canada |
Does anyone have a link to more info on Eric's system?
Thanks. |
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| mepstein |
Apr 5 2021, 12:20 PM
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#9
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914-6 GT in waiting Group: Members Posts: 20,587 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region
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QUOTE(MikeM @ Apr 5 2021, 02:10 PM) Does anyone have a link to more info on Eric's system? Thanks. I would contact PMB. They have always been very responsive to me. |
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| theghoul |
Apr 5 2021, 12:27 PM
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#10
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Newbie Group: Members Posts: 5 Joined: 5-April 21 From: cleveland ohio Member No.: 25,401 Region Association: None |
All great info- thanks - will reiinspect all the parts involved - I hope the extra engine is from a 73 or 74! thanks, theghoul
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