Oh yeah Buddy.... KILL THE NEWBIE!!!!

[futuresoptions]

NO CIS FINE TUNING ISSUES HERE HE HE.......

[EarlyPorsche]

I think thats amazing. I would love to have one reliable american carburator WITH A CHOKE for cold starting. But no, ferdy had to take out the chokes for "more flow".

[VFR750]

Hmmmm.

What a great option to PMOs

[Danny_Ocean]

Holley made a set-up like that back in the 80's. I guess it wasn't a big seller as its been long discontinued.

[futuresoptions]

Had aluminum box made to cis air box specs so i could use original intakes. Mounted 2bbl carb made for 1968 Mustang W/289 engine.
uses stock linkage but had to lengthen the arm to reach the carb.
Installed a mallory adjustable fuel pressure regulator from Summit Racing. I still use factory fuel pump and fuel filter. It runs great.
I paid $140. for the carb at Oreilly's (would have been $100 if I had a core) $250. Labor/Materials for the box. and $100. for the fuel pressure
regulator including shipping. Having no more fuel injection headaches Priceless.....

[futuresoptions]

I plan on installing an electric choke on her but haven't done so yet. All I can tell you guys is that once I had it installed It fired up and ran like it had been a factory option. It was running a little rich at start up (producing a little black smoke from exhaust) but I reached around the carb (which is mounted backwards) made a quick adjustment and now it runs great.

[Danny_Ocean]

Nice work! Just do yourself a favor and get rid of that air cleaner. It is a fire-bomb waiting to happen. I had to put mine out twice before I realized it's time for a change.

[notfarnow]

I remember when you originally posted this idea, you got roasted by a couple people. Looks like they'll have to eat their hats.

You should shoot a short video and put it on youtube, then post here. Dyno results would be cool too.

The single weber carb conversions with long runners on type IV engines tend to be cold-blooded, are you experiencing any of that?

[futuresoptions]

Hey Danny,

Couldn't agree with you more on the foam element Edelbrock uses on that cleaner. Ran one on a circle track camaro I used to run. After the first race I had holes the size of half dollars burnt into it. Another thing is that they sale the complete setup but just try and find a single element for sale anywhere for it. I found out when I was racing that I could use high grade HVAC filter media in place of the foam type media, and never had any other problem with the cleaner.

[EarlyPorsche]

So is that electric choke or manual? I really want to do this on my 2.0. I think I could buy some stock manifolds and put two new carburators on it. It would run so much better than the two threepack webers. Probably a ton more down low power and less up top where it doesn't really need to have more power.

[futuresoptions]

Well, I haven't gotten everything hooked up correctly yet on it. I still need to cut into the box and put in a vacuum port for a universal vacuum canister for brakes, and to attach the vacuum advance for the distributer. I did take it out for a test run and this is what I can tell you.
when normally driving it felt great. When I punched the gas it has a slight hesitation (Probably from vacuum advance not being installed) and then it feels like I cracked the whip on an evil monster that wants to kill me... LOL It has full power range, I just need to get everything hooked up and I will fill you guys in on how it does. I would say this much. If anyone had a 911 sitting around that they are frustrated with and can't keep running. Maybe doesn't have the technical skills or money to repair CIS or purchase PMO's this would definately be the way to go. I think the only thing that might differ, is if someone had a 2.0 or 2.2 motor that this particular carb maybe a little too much. One could probably purchase the same carb, but one that has been jetted down for a 6cyl application and would probably do just fine. Anyway thanks for the replies and if I have been able to help anyone out with this project then I hope I have done my job as a good Pelican.

[futuresoptions]

Hey early porsche,

it will have an electric choke installed.

[HelmetHead]

I wonder if the same thing could be done using 3 IDF weber 40's? SIX PACK....

[RWebb]

A single carb is decidedly inferior to having a tube for each cylinder. PMOs are the way to go if you go with carbs.

Yes, a choke restricts air flow. It's a sports car. So you are expected to compromise for performance (or get a modern EFI system).

One CAN turn a silk purse into a sow's ear but I don't really see the point in doing so.

[Hladun]

futuresoptions, can you dyno your setup to put the naysayers to rest? Also, what kind of fuel consumption are you getting?

If nothing else you've got a damn clean looking setup.

[Rot 911]

A well thought out modification!

[futuresoptions]

Don't know where I could get a dyno done round here lol (I live in deep south texas). I haven't got the car back on the road as of yet, I need to do the work on the vacuum lines and I just ordered all new shift bushings, polygraphite camber plate bushings etc....
once these parts come in towards the end of the week I will install everything and get it back on the road. I will at least be able to give fuel consumption data and possibly post a short video on youtube like one of the earlier Pelicans requested. I know we have a PCA chapter here in the Rio Grande Valley, but I am not as yet a member. I may look into that a little further and maybe someone can put me in the direction of someone that has a dyno locally. ( I would equally be interested in seeing that data, just to see what the differences would be either positive or negative.)

[RWebb]

re naysayers...

I am sorry to rain on the parade - as I'm sure are the others who pointed out the problems with this. It is not personal.

The simple fact is that you will never get the performance of single carbs or or of an EFI that works similarly. You can do dyno runs until the ice caps melt, but you will not change the physics.

Anyway, good luck - I hope it was not too expensive.

[futuresoptions]

Hey RWebb,

No problem with the rain man (no Pun intended), When I started this project I had no intensions of increasing horsepower over the stock setup. I also felt that after reading everyone's posts from my original postiing that I would probably loose some performance characteristics over the stock setup. My intensions were as follows. To install a single carb in a stock configuration that would allow easier maintenance and repair, and would cut down on engine clutter and weight. I just feel that if I have lost some performance characteristics of the car, that the fewer links in the chain to break are worth the loss. I will use this car as a daily driver and it will never be autocrossed at PCA or SCCA events. So I do believe you are correct probably about the performance aspects, but for me this a more practicle setup. And a good example would be this: Two years from now the carb becomes sluggish. Now that I have a carburator to trade in for a core. I can go to the parts house and get a new one for $100. I can replace the entire carb for less than the price of a new cold start valve.

[Grady Clay]

I did that with a fire survivor (insurance purchase) in ’73 with a ’73.5 911T. I think it is still driving around Denver 35 years later. I saw it about three years ago.

Interesting P+A didn’t warranty the fire and I bought it through the insurance salvage. This was probably the first CIS 911 in Colorado.

In cold weather it doesn’t work well because the fuel can puddle in the bottom of the plenum (CIS puts the fuel above the valves, not in the plenum). Even when hot, the #2 & #5 cylinders run very rich. On that car we used the MFI thermostat heat (still on the L heat exchanger) on the bottom of the plenum and it worked OK at the expense of performance.

While I’m not happy with our (lame by my standards today) engineering, the fact that the 911 has survived 35 years is pretty remarkable. It has had to pass Front Range emissions standard to continue to be registered.

Hopefully the current caretaker (owner) will post.

BTW, we used a period real air filter, not some crummy screen. That was the same as I used (X2) on the 587/3 engines.

This is only a solution with CIS cams. Anything like a 911T (carb & MFI) cam and more doesn’t work.

Anyone considering this should investigate the easy EFI solutions available.

Best,
Grady