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> Whats wrong with my Carbs?, wants to stall leaving the traffic light.
Hans Jan
post Mar 25 2017, 09:12 PM
Post #1


Group: Members
Posts: 143
Joined: 5-April 16
From: Sugar Land TX
Member No.: 19,860
Region Association: Southwest Region


Not having much luck with the Search function.

The car: 1972, with 103mm cylinders (2.3l), aftermarket cam and larger valves with double springs.

Fuel supply: Dual EMPI HPMX 44 Carburetors,
Jets: .55 Idle, 1.55 main, Air 1.75.

History: After car-fire engine was out, heads taken off and some studs and springs replaced. Changed to quieter exhaust.
Had trouble with dialing in the carburetors and changed the jets to the recommendations from EMPI (see above). It runs a lot better now.

Remaining complaint;
The car runs pretty good (especially above 2,800) RPM.
However; It takes me a while to leave after each stop (stop signs traffic lights etc) because the car want to stall. When I push the accelerator to quickly the RPM dips down, and car will die. Only when I ease on the paddle very gently, it will increase in RPM, and I can lift clutch at above 1,500 RPM.

Anyone here understands this issue?

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Hans Jan   Whats wrong with my Carbs?   Mar 25 2017, 09:12 PM
exultant1   What's your timing? What distributor are you u...   Mar 25 2017, 09:33 PM
Spoke   Are your acceleration jets working? Sounds like it...   Mar 25 2017, 09:37 PM
r_towle   I would certainly check the distributor, advance w...   Mar 25 2017, 09:45 PM
Keith914   My 1.365 liter type IV has twin 44 Webers. It runs...   Mar 25 2017, 10:05 PM
Keith914   Also, you need to be sure the "dormant" ...   Mar 25 2017, 10:08 PM
PotterPorsche   I'm with Keith your mains are a a little fat....   Mar 25 2017, 11:21 PM
Hans Jan   Wow guys that is quite a response. Most of which I...   Mar 26 2017, 11:03 AM
r_towle   Smaller venturis limit the overall amount of air, ...   Mar 26 2017, 11:12 AM
r_towle   You want a wide band air/fuel meter with a gauge. ...   Mar 26 2017, 11:16 AM
r_towle   The nice part about carbs, at least our Weber...   Mar 26 2017, 11:19 AM
porschetub   The smaller vents will lose some power right @ the...   Mar 26 2017, 01:43 PM
rhodyguy   Buy yourself a copy of the CBperformance weber man...   Mar 26 2017, 01:48 PM
Keith914   Oops, 2.365Liters!   Mar 26 2017, 02:29 PM
dyckster   Hi Hans, everyone is going to have an idea about w...   Mar 26 2017, 02:48 PM
stugray   My most recent weber challenges: 1 - My accel pum...   Mar 27 2017, 11:51 AM
Hans Jan   From what I gather, it appears that I need to chec...   Mar 27 2017, 01:48 PM
Racer Chris   Use 28 degrees btdc @ 3500 rpm. If I recall corre...   Mar 27 2017, 02:53 PM
forrestkhaag   Also (Kieth) didn't we both notice exceptional...   Mar 27 2017, 03:10 PM
Hans Jan   Thanks for your input. I'm a little short on ...   Mar 29 2017, 09:53 PM
cgnj   Thanks for your input. I'm a little short on...   Mar 29 2017, 10:12 PM
Hans Jan   [quote name='Hans Jan' post='2469862...   Mar 29 2017, 10:26 PM
Hans Jan   Received the 34mm Venturi's, and i stalled the...   Apr 4 2017, 11:18 AM
Racer Chris   When it idles, it is not possible to get the car...   Apr 4 2017, 12:45 PM
Hans Jan   When it idles, it is not possible to get the ca...   Apr 4 2017, 02:23 PM
Racer Chris   [quote name='Racer Chris' post='2471999' date='Ap...   Apr 4 2017, 03:27 PM
rhodyguy   Or use 1 idle speed adj screw to raise the idle. T...   Apr 5 2017, 07:19 AM
Hans Jan   Keeping you up to date: This weekend I should rec...   Apr 11 2017, 09:14 PM
BigFour1973   I was having similar issues. -Confirm the intake m...   Apr 11 2017, 11:19 PM
flyer86d   I agree with the above post. I had this happen on ...   Apr 12 2017, 12:05 AM
Hans Jan   Installed larger (0.65mm) idler jets today. This m...   Apr 20 2017, 09:59 PM
Keith914   Agree with Forrest.   Apr 21 2017, 07:58 AM
Racer Chris   65 idles will probably make it a bit rich at part ...   Apr 21 2017, 08:07 AM
Hans Jan   It's done. With the new jets, the car is runni...   Apr 28 2017, 05:10 PM

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