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DrSAX1974 Samba Member
Joined: August 15, 2018 Posts: 36 Location: Carbondale, IL
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Posted: Tue Jun 13, 2023 12:12 pm Post subject: Weber 40 DCNL 5 Carburetors on a 912e |
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I just got the 912e. It's in rough shape and it will probably take me a couple of years to get it to where it needs to be. It is missing the FI system completely and came with two double barrel weber 40 dcnl 5 carbs. From a quick perusal of the web it seems these came off a Maserati Ghibli and are worth $2k to 3K for the pair. My question is will these work with the 912e type 4 engine? Should I sell these and either piece together a FI kit or go with the classic 40 IDF webers?
Thanks! |
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Starbucket Samba Member
Joined: April 30, 2007 Posts: 4029 Location: WA
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Posted: Tue Jun 13, 2023 4:35 pm Post subject: Re: Weber 40 DCNL 5 Carburetors on a 912e |
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Do they have manifolds and linkage? Do you have to pass smog in your state? The classic 40's will have manifolds for your motor available so what ever is easier would be my choice. |
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Wolfgangdieter Samba Member
Joined: June 25, 2008 Posts: 1958 Location: FL Panhandle
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Posted: Tue Jun 13, 2023 4:54 pm Post subject: Re: Weber 40 DCNL 5 Carburetors on a 912e |
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Be nice to know what parts are in the engine --- especially the cam. The EFI cam doesn't work well with carbs. The OEM FI wasn't designed for performance - more for emissions. I'd look at Megasquirt FI systems. _________________ CMC '57 Porsche Speedster Replica and Dolphin boat tailed full pan VW MOD-T Street Buggy |
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DrSAX1974 Samba Member
Joined: August 15, 2018 Posts: 36 Location: Carbondale, IL
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Posted: Tue Jun 13, 2023 11:02 pm Post subject: Re: Weber 40 DCNL 5 Carburetors on a 912e |
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I have the manifolds but not the linkage. I think I could figure out a way to link them. Unsure about the cam, but since this engine came to me incomplete, the heads look brand new, and the case is clean and without oil, I think I’ll crack the case and see what’s what. The body work alone is going to take me a year or two so I’m in no hurry. On the 912bbs site someone recommended selling them and putting on dellortos.
The cam situation is a different matter. Is there a way to check whether the cam has the right grind for carbs or not? I have a FI web cam on my bus which I’ve really enjoyed maybe I can get a good performance carb cam from them?
Oh, and no smog in my state (IL). |
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Nitramrebrab72 Samba Member
Joined: November 10, 2018 Posts: 489 Location: France
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Posted: Wed Jun 14, 2023 1:11 am Post subject: Re: Weber 40 DCNL 5 Carburetors on a 912e |
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The 912E dosn't have that much more value 100 % original or not , and to find all the bits to do so is possible, but not easy and the original engine had at best 88hp . I would of thought if you want to make something nice to drive and fun and take advantage of the 911 suspension/chassis , at least 2056cc or more with a mild performance cam, up the compression, polished heads and an ext oil cooler. |
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DrSAX1974 Samba Member
Joined: August 15, 2018 Posts: 36 Location: Carbondale, IL
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Posted: Wed Jun 14, 2023 4:23 am Post subject: Re: Weber 40 DCNL 5 Carburetors on a 912e |
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I do, I just don’t know if these webers will work for a type 4. Putting the original FI in is going to be impossible as it was a bespoke system made up of both D-jet and L-jet parts and you are right about the low performance (though I do love the L-jet in my bus). If I went FI, I was thinking about a megasquirt sort of set up. If I went for carbs I was looking for what would be the ideal setup. It does have petronix and a nice performance exhaust and fuel pressure regulator. |
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Nitramrebrab72 Samba Member
Joined: November 10, 2018 Posts: 489 Location: France
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Posted: Wed Jun 14, 2023 4:59 am Post subject: Re: Weber 40 DCNL 5 Carburetors on a 912e |
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Me too. I modified a porsche 914 1.8 L jetronic and fitted it to my T25 Aircooled 2.0l it had twin solexs from new but they were too worn out .
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Nitramrebrab72 Samba Member
Joined: November 10, 2018 Posts: 489 Location: France
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Posted: Wed Jun 14, 2023 5:17 am Post subject: Re: Weber 40 DCNL 5 Carburetors on a 912e |
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Wolfgangdieter wrote: |
Be nice to know what parts are in the engine --- especially the cam. The EFI cam doesn't work well with carbs. The OEM FI wasn't designed for performance - more for emissions. I'd look at Megasquirt FI systems. |
I believe the cam's in the 914/912E type 4s had a Porsche one grinde for all . If thats the case Porsche ran a twin carb set up in the 914 1.8L on the same cam and I don't believe the D and L jetronic being an old tech Eletro Mechanic as opposed to a modern Electronic Computer needed a over specific cam. I run an L jetronic on a CU vanagon engine and she runs so sweet with loads tourque. |
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raygreenwood Samba Member
Joined: November 24, 2008 Posts: 21521 Location: Oklahoma City
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Posted: Wed Jun 21, 2023 2:04 pm Post subject: Re: Weber 40 DCNL 5 Carburetors on a 912e |
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Nitramrebrab72 wrote: |
Wolfgangdieter wrote: |
Be nice to know what parts are in the engine --- especially the cam. The EFI cam doesn't work well with carbs. The OEM FI wasn't designed for performance - more for emissions. I'd look at Megasquirt FI systems. |
I believe the cam's in the 914/912E type 4s had a Porsche one grinde for all . If thats the case Porsche ran a twin carb set up in the 914 1.8L on the same cam and I don't believe the D and L jetronic being an old tech Eletro Mechanic as opposed to a modern Electronic Computer needed a over specific cam. I run an L jetronic on a CU vanagon engine and she runs so sweet with loads tourque. |
D-jet and L-jet do not mix. Yes you can use manifolds, plenum, throttle body and hardware from L-jet with D-jet and vice-versa.....but none of the electronic parts will trade back and forth except TS-1 and 2 sensors.
D-jet and L-jet are NOT "electromechanical". They are both fully electronic.
The only parts that can be considered mild electromechanical are the MPS for D-jet (which is still an electronic MAP sensor in final output) and the AFM in L-jet (which has a mechanical rheostat like contact).....but is still delivering a resistance based electronic signal.
Both have ECU's controling it all....but yes they are nothing lime modern.
Yes....D-jet is VERY specific about what camshaft it can operate with. Because it's fully map controlled.....it's very sensitive to changes in vacuum profile caused by any component that changes the way the engine runs.
This does not mean that the cam cannot be upgraded.....but you must choose correctly and tune to work with it.
Ray |
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[email protected] Samba Member
Joined: December 28, 2016 Posts: 280 Location: atlanta ga
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Posted: Thu Jun 22, 2023 7:43 am Post subject: Re: Weber 40 DCNL 5 Carburetors on a 912e |
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I would buy a new set of weber 40s and sell those, car will run fine with a new set and you could cover the price by selling those old rare ones
DrSAX1974 wrote: |
I just got the 912e. It's in rough shape and it will probably take me a couple of years to get it to where it needs to be. It is missing the FI system completely and came with two double barrel weber 40 dcnl 5 carbs. From a quick perusal of the web it seems these came off a Maserati Ghibli and are worth $2k to 3K for the pair. My question is will these work with the 912e type 4 engine? Should I sell these and either piece together a FI kit or go with the classic 40 IDF webers?
Thanks! |
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Nitramrebrab72 Samba Member
Joined: November 10, 2018 Posts: 489 Location: France
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Posted: Thu Jul 06, 2023 3:54 am Post subject: Re: Weber 40 DCNL 5 Carburetors on a 912e |
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raygreenwood wrote: |
Nitramrebrab72 wrote: |
Wolfgangdieter wrote: |
Be nice to know what parts are in the engine --- especially the cam. The EFI cam doesn't work well with carbs. The OEM FI wasn't designed for performance - more for emissions. I'd look at Megasquirt FI systems. |
I believe the cam's in the 914/912E type 4s had a Porsche one grinde for all . If thats the case Porsche ran a twin carb set up in the 914 1.8L on the same cam and I don't believe the D and L jetronic being an old tech Eletro Mechanic as opposed to a modern Electronic Computer needed a over specific cam. I run an L jetronic on a CU vanagon engine and she runs so sweet with loads tourque. |
D-jet and L-jet do not mix. Yes you can use manifolds, plenum, throttle body and hardware from L-jet with D-jet and vice-versa.....but none of the electronic parts will trade back and forth except TS-1 and 2 sensors.
D-jet and L-jet are NOT "electromechanical". They are both fully electronic.
The only parts that can be considered mild electromechanical are the MPS for D-jet (which is still an electronic MAP sensor in final output) and the AFM in L-jet (which has a mechanical rheostat like contact).....but is still delivering a resistance based electronic signal.
Both have ECU's controling it all....but yes they are nothing lime modern.
Yes....D-jet is VERY specific about what camshaft it can operate with. Because it's fully map controlled.....it's very sensitive to changes in vacuum profile caused by any component that changes the way the engine runs.
This does not mean that the cam cannot be upgraded.....but you must choose correctly and tune to work with it.
Ray |
There is no computer chip with a pre programmed map on either the D jetronic of L jetronic. Both are controlled by mechanical movements of potentiometers by either manifold pressure variations D jetronic or air flow L jetronic. The L jetronic for example can be 're mapped' by changing the position of the potentiometer arm and/or spring not by reprogramming a computer chip with computer software this is a fully mechanical adjustment. The d jetronic injections or activated by mechanical breaker switches in the distributor and the L jetronic by a signal from the distributors points. L jetronic use the voltage created by a mechanical movement to determine the duration of the injection not a computer chip.
Yes mechanical movement that determines a voltage. Electromechanical . Do you have access to an old school dictionary. ?? |
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Lowlightmafia Samba Member
Joined: January 29, 2017 Posts: 91
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Posted: Sat Nov 04, 2023 2:59 pm Post subject: Re: Weber 40 DCNL 5 Carburetors on a 912e |
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DrSAX1974 wrote: |
I just got the 912e. It's in rough shape and it will probably take me a couple of years to get it to where it needs to be. It is missing the FI system completely and came with two double barrel weber 40 dcnl 5 carbs. From a quick perusal of the web it seems these came off a Maserati Ghibli and are worth $2k to 3K for the pair. My question is will these work with the 912e type 4 engine? Should I sell these and either piece together a FI kit or go with the classic 40 IDF webers?
Thanks! |
Are you looking to sell them. I’m looking to purchase a complete pair. |
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