912e EFI to Carbs

[Nige-912E]

Guys

I'm just about to swap to a pair of of twin 40 del's, I'm unsure if I need to change the original fuel pump to something that pumps a lower pressure?

Things I'll be changing/adding for the conversion

Linkage - any recommendations?
Dizzy - maybe 009 or could I keep the current vac advance unit and T in some lines from the carbs?
Adding a fuel pressure reg?

Does the rev counter take its readings via the coil or is an integral part of the EFI? basically will it still work?

Any advice or recommendations would be very useful

Cheers
Nige

[914Ghost]

Nige-
40 Dell's is what I run on both my cars- they'll be GREAT!
You DO need to swap the pump, look for a good quality rotary pump, they are quiet and last forever- Carter is a great manufacturer or rotary fuel pumps- you need 3.5lbs...5lbs max.
Linkage- CB performance linkage is the best, generally, look for their site online.
Dist- 009's are kinda crappy compared to some other distributors, look for a Bosch 050- or a Porsche 356 or 912 distributor, the models to look for are 031, Boschxxx..022
,Bosch Vjr4Br8- the last 2 have cast iron bodies but are similar to the 031 and 050 for daily driving.
And the tchometer runs right off the coil, shouldn't have to change anything there.
Good luck!
Bob O
p.s. GET the dellorto tech book too, it is absolutely required!

[Nige-912E]

Thanks 914Ghost for you constructive advice, I normally just get 'why change to carbs' then feel I have to justify myself

[bigschauer4]

form one 912e owner to another-- as long as you are changing from fuel injection to carbs, would you be willing to part with some of your functioning fuel injection parts for the 2.0 type4 engine? I'm specificaly looking for the air elbow with runs from the airfilter to the airintake manifold for the fuel injection. Mine has some small cracks in it which I have siliconed, but I'm looking for an elbow which is in great shape !! I would really appreciate your help!! Thank you!! Bill

[COLDBASS]

Hello Nige,

I am curious as to why?

[lapuwali]

I won't give you the "why bother" comments, as you're clearly committed. I'd advise you not to let go of any of the EFI parts until after you get the carbs running to your satisfaction.

Dell Ortos aren't made anymore, and parts are getting hard to find. Weber IDFs might be a better choice if you can find a set and swap the Dells for them.

Any low-pressure pump will work. You may have an easier time finding a Facet pump in the UK instead of a Carter. Rotary pumps are quiet and work well, but are a good bit more expensive than the interrupter pumps. The carbs won't care either way. Use your EFI fuel filters, they're the best you can get. Carbs are VERY picky about any junk in the fuel.

A fuel pressure regulator would be a good thing to have, though many carb pumps are internally regulated, so it's something of a belts and braces thing to have both.

I'll agree with the comments about the 009 being crap. Use the stock distributor and either tap into the manifolds or just plug the vacuum at the distributor.

Good luck, but be prepared to swap back unless you're also planning on changes that make swapping back impossible.

[Nige-912E]

Cheers guys

I won't be letting any of the EFI go, it'll be stored away for future reference or reversal.

bigschauer4 - The rubber air intake from the air filter to throttle body, mine is just as cracked and flaky as yours, that's one of the reasons why I've swapped to carbs as the whole system is looking alittle tired. Its done well as its not let me down since I've had the car, although I've only put about 20k on it, its done 185k!! I'm sure with some wise parts swapping and searching it could be bought back to peak performance. But for now its in my stock pile of parts.

Possibly after a few months of messing with the carbs I may decide to go back to EFI, the whole things is abit of an experiment.

[COLDBASS]

Nige,

Not sure if this helps, but a few years ago I saw an E that had a 914 EFI system installed, including air filter configuration.

Some guys swear by carbs, I dont know, IMO it makes things look like a volkswagen and we all know that its a Porsche

Good luck my friend,

Regards,

Bob

[914Ghost]

But....didnt VW have basically the same Bosch L/D/K -Jet fuel injection..?
The Carbs, which were never supplied on VW's make it look more like a VW than the EFI, which was installed on many VW's ?
You know, as much as it is a Porsche- the engine IS a VW design made with VW parts, as the ORIGINAL VW engine is a Porsche design...it's like a creepy mobius strip of "who's idea is it!?"
Just remember we're all one happy family man!!



Bob O

[Nige-912E]

Thanks guys for you thoughts and suggestions

I'll post a few photos of the install once it starts progressing and let you know what I think of the carb setup once its on the road.

Cheers
Nige

[WFBowen]

Nige:
I used to run 40 IDF's on my 912E (of course, I had to put the FI back on every 2 years for the smog test here in CA.) As you know, the original pulse FI is not really any kind of performance setup, but merely for fuel economy, smooth running &, of course, pollution control. IMO, there's nothing better than one venturi per cylinder with that throttle valve sitting as close to the intake valve as possible, be it carbs or an MFI like the early 911's. Considering the price of 912E FI components (if available at all,) I think it's a wise move - especially if your laws allow it.
Good luck
Bill.

[COLDBASS]

Originally posted by WFBowen
Nige:
As you know, the original pulse FI is not really any kind of performance setup, but merely for fuel economy, smooth running &, of course, pollution control.
Good luck
Bill.

Agreed, in the EFIs stock, unmodified, L-Jet configuration, however....

[912UK]

Hi Nige Mine runs carbs and I have a fuel pump in the back running it all. It's a standard pump from the likes of Demond Tweeks .co.uk

Later

Mark