Printable Version of Topic
Click here to view this topic in its original format
914World.com _ 914World Garage _ Carb advice
Posted by: yellownerd May 19 2022, 12:51 AM
Thanks in advance for your expert advice!
I’m current running a single ill performing Weber 32/36 progressive carb on my 73 1.7. Before I rip and replace it, is there anything else I should be considering? Any thoughts on dual carbs?
Posted by: 930cabman May 19 2022, 05:03 AM
You may find a consensus here of single carb haters. I cannot recall reading one post where the owner was happy with a single carb conversion. BUT, I purchased a '74 last year with a single Holley conversion and it was ok, most recently I have changed it to twin Webers. If she is running, let her keep running
Posted by: Shivers May 19 2022, 06:59 AM
If it gets cold where you are, I might suggest another set up. I put one on in the early 80's and it got me around, in SoCal where it is warm. Those long rails were made to carry air, fuel vapor does not do well in those tubes. It was on my car about 3 months and went to duel 40 webers when I made my 1700 a 1911. And nothing sounds like duel carbs. 
Posted by: brant May 19 2022, 07:32 AM
The problem with a single carb is that the fuel does not stay suspended (mixed with air) in the long length of the intake runners
Remember the carbs job is to mix the fuel into mist mixed with air
The long intake causes the droplets to pool and drip out of the air mix
The fuel lnjection system only carried air without fuel in those intakes
Twin carbs with shorter intakes will always mix better…. Physics
Posted by: GregAmy May 19 2022, 08:01 AM
Remember the carbs job is to mix the fuel into mist mixed with air
The long intake causes the droplets to pool and drip out of the air mix
The fuel lnjection system only carried air without fuel in those intakes
Which is why - sorry, I have to say it, it's a compulsion - a properly-working stock EFI system is sooooo much moar betterer for street driveabilty on a stock-ish engine. And there's a ton of knowledge and support now for those systems, such that ripping it off and replacing with a single carb just isn't reasonable any more.
But that said...yeah, duals are much betterer than the single for overall driveability, especially in varying ambient conditions. - GA
Posted by: yellownerd May 19 2022, 08:36 PM
If possible, please recommend a kit. I'd prefer to spend a few dollars more to grab a dual carb kit that includes all I will need for the conversion. Here's a few pics...
Posted by: 914werke May 19 2022, 08:50 PM
PM'ed
Posted by: nditiz1 May 19 2022, 09:29 PM
Set of Weber 40s - Aircooled.net has a setup as well and John sets them up and goes through them.
Intakes from CB Performance - actually could just buy the carbs from them too
Phenolic spacer gaskets
SvDA distro - pertronix one that removes the points too OR 123 ignition distro
CSP linkage OR tangerine OR sync link, not sure where to buy this one, but tangerine is similar
Vacuum check valve
Carb kit should come with air filters
Breather box - can be cheap EMPI or home built
Your current Fuel Pump should be good for dual carbs
Posted by: yellownerd May 20 2022, 08:21 AM
Set of Weber 40s - Aircooled.net has a setup as well and John sets them up and goes through them.
Intakes from CB Performance - actually could just buy the carbs from them too
Phenolic spacer gaskets
SvDA distro - pertronix one that removes the points too OR 123 ignition distro
CSP linkage OR tangerine OR sync link, not sure where to buy this one, but tangerine is similar
Vacuum check valve
Carb kit should come with air filters
Breather box - can be cheap EMPI or home built
Your current Fuel Pump should be good for dual carbs
Thanks! I'll check this out.
Posted by: CCE May 20 2022, 08:36 AM
My car now.
About to be finished. (Shortly) with my CB performance ignition kit and 44 webers
Posted by: rhodyguy May 20 2022, 08:56 AM
Buy a Triad X bar linkage while you still can. That fuel filter should not be in the engine compartment. Get some shouldered clamps for the fuel lines. Seek out a set of 40s, Italian or Spanish, and let a pro shop go though them. CB tall manifolds can be had for about 1/2 price in the classifieds here.
Powered by Invision Power Board (http://www.invisionboard.com)
© Invision Power Services (http://www.invisionpower.com)