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Carb conversion??? should I???

I recently read an article that a guy converted his fuel injected engine to accept carbs. I have a 1978 SC 3.0, would there be any benefit to do this or is it even possible? I am a big fan of the look of those intake stacks I must say. I am relatively new to Porsche mechanics so forgive my ignorance here.
Old 05-14-2012, 01:54 PM
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Yes you can...

'78 3.0 SC
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Old 05-14-2012, 02:27 PM
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This is what comes off...


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Old 05-14-2012, 02:32 PM
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It's true nothing looks finer than the setup posted BUT imho, you will not have as good driveability, fuel mileage and quite possibly power and torque with a carb setup. I ran into a guy that has designed a modern fuel injection for the older 911's. He had it on his and it was simple, clean and worked well.
Old 05-14-2012, 03:56 PM
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Quote:
Originally Posted by brighton911 View Post
It's true nothing looks finer than the setup posted BUT imho, you will not have as good driveability, fuel mileage and quite possibly power and torque with a carb setup. I ran into a guy that has designed a modern fuel injection for the older 911's. He had it on his and it was simple, clean and worked well.
Bitz kit or what?
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Old 05-14-2012, 04:07 PM
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If you switch to carbs you can expect the following: 20-30 HP depending on tuning, exhaust, and RPM limit. Car will only get 15MPG or so. Car will sound awsome. Car will not pass any kind of smog inspection. Car will be harder to start in cold weather.

-Andy
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Old 05-14-2012, 05:00 PM
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It had it's advantages and disadvantages when I had them. In the end the CIS system is just easier to deal with - for me. It's cold a lot of the year here in Colorado so CIS is nice for those cold morning starts. Also CIS works a bit better with my AC, with my carbs I had my "summer idle" settings and my "winter idle" settings. The carbs were nice as well once warmed up.
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Old 05-14-2012, 06:31 PM
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YUP!!!!!
fairly easy conversion. motor comes alive, sounds great and looks clean.

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Old 05-14-2012, 07:44 PM
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Lightbulb

Carbs are funner. Pair them with an MSD for the ULTIMATE experience, more power than the original Bosch.

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Old 05-14-2012, 09:09 PM
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more conversion porn. go with PMO's and a mechanical distributor update and some SSI's and it's game on!!
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Old 05-14-2012, 10:00 PM
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I just carbed my 76 911s and I don't regret it even a little bit! The throttle response is incredible, the noise is intoxicating and it looks 1000% cleaner!! Carbs all the way for me!
Old 05-14-2012, 10:01 PM
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Can Someone recommend a good set up for me? I like the individual air cleaner or stack look. I have a 3.0
Old 05-14-2012, 10:49 PM
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... and a mechanical distributor update ...
Could you please elaborate? Thanks Martin
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Old 05-15-2012, 02:04 AM
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Single plug or dual??

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Originally Posted by snbush67 View Post
Carbs are funner. Pair them with an MSD for the ULTIMATE experience, more power than the original Bosch.

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Old 05-15-2012, 05:29 AM
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Weber 40s from Performance Oriented and a used set of SSI heat exchangers. I'd also pop for an MSD ignition box with an MSD blaster coil. The distributor will need to be re-calibrated; Aaron Burnham @ Rennwerks is a good choice...

Fuel milage will drop off some depending on how well it's tuned
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Old 05-15-2012, 05:45 AM
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Quote:
Originally Posted by Eagledriver View Post
If you switch to carbs you can expect the following: 20-30 HP depending on tuning, exhaust, and RPM limit. Car will only get 15MPG or so. Car will sound awsome. Car will not pass any kind of smog inspection. Car will be harder to start in cold weather.
No mention of throttle response? IMO that is the biggest benefit to them. You get an individual throttle plate per cylinder, and a very short intake runner. Compared to CIS, the throttle response is a night and day difference.
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Old 05-15-2012, 08:26 AM
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Single plug or dual??
3.2SS single plug 9.5:1, I used J&E 98mm pistons. I recently rebuilt and modified the distributor, removing the pod:

DIY -- Distributor Vacuum Pod Delete and Vacuum Lockout

Here is the build thread if your interested:

Shanes 3.2 SS - Recommendations and Advice

And here is the link to the sound:

Sound Video Preview; M&K with RARLYL8 Headers
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Last edited by snbush67; 05-15-2012 at 09:47 AM..
Old 05-15-2012, 09:43 AM
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Quote:
Originally Posted by Juggino View Post
I recently read an article that a guy converted his fuel injected engine to accept carbs. I have a 1978 SC 3.0, would there be any benefit to do this or is it even possible? I am a big fan of the look of those intake stacks I must say. I am relatively new to Porsche mechanics so forgive my ignorance here.
do you have a link to the article, im in the process of prepping for an engine drop for work and a carb conversion
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Old 05-15-2012, 05:56 PM
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46mm Webers, will be FS complete with all hardware and air cleaners soon...

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Old 05-15-2012, 06:05 PM
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Originally Posted by lindy 911 View Post
Weber 40s from Performance Oriented and a used set of SSI heat exchangers. I'd also pop for an MSD ignition box with an MSD blaster coil. The distributor will need to be re-calibrated; Aaron Burnham @ Rennwerks is a good choice...

Fuel milage will drop off some depending on how well it's tuned
Lindy,

I agree, but do you think he will be OK with the 78 dizzy. Unless it is just worn out and needs refreshing.

OP,

Individual air cleaners on stacks look sexy, but I have read that performance wise they aren't up to par with the k&N style air cleaners.
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Old 05-15-2012, 06:26 PM
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