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vapor lock / carb boiling in the bowl how to tell diff? #74546
06/16/08 03:36 PM
06/16/08 03:36 PM

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My 65 dart /6 with a 1 barrel Holley has had what appear to be vapor lock problems. I've recently learned that boiling in the bowl in the carb is similar.

How do I tell the difference when it is happening?

Re: vapor lock / carb boiling in the bowl how to tell diff? #74547
06/16/08 03:42 PM
06/16/08 03:42 PM
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
RapidRobert Offline
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not sure but the /6 heat risers divert WAY too much heat.I would turn the counterweight "off"(I forget which way that is) & lock it there.


live every 24 hour block of time like it's your last day on earth
Re: vapor lock / carb boiling in the bowl how to tell diff? #74548
06/16/08 04:09 PM
06/16/08 04:09 PM
Joined: Jul 2003
Posts: 6,167
Maryland
GO_Fish Offline
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Maryland
Quote:

My 65 dart /6 with a 1 barrel Holley has had what appear to be vapor lock problems. I've recently learned that boiling in the bowl in the carb is similar.

How do I tell the difference when it is happening?




They are essentially the same thing. The fuel pump cannot pump vapor, only liquid. So whether the vapor occurs somewhere along the fuel line, or inside the carb, the pump cannot pump vapor.


Scott B. "I'm a self-made man... I started with nothing, and I still have most of it!" 68 360 rusty B'cuda 'vert (GO Fish)13.59@ 98.72 mph 69 340 GTS stock 14.18@ 95.60 mph 01 5.9L Ram 1500 Quad Cab 4x4 01 3.5L 300M 16.23@ 86.97 mph
Re: vapor lock / carb boiling in the bowl how to tell d [Re: GO_Fish] #74549
06/16/08 04:59 PM
06/16/08 04:59 PM

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I knew they were the same thing but different locations. I want to know how to tell the difference since they would require different fixes.

Re: vapor lock / carb boiling in the bowl how to tell d #74550
06/16/08 06:27 PM
06/16/08 06:27 PM
Joined: Jul 2003
Posts: 6,167
Maryland
GO_Fish Offline
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Maryland
My experience with boiling in the carb is that you can hear it boiling a minute or two after engine shut down (at least on a small block).


Scott B. "I'm a self-made man... I started with nothing, and I still have most of it!" 68 360 rusty B'cuda 'vert (GO Fish)13.59@ 98.72 mph 69 340 GTS stock 14.18@ 95.60 mph 01 5.9L Ram 1500 Quad Cab 4x4 01 3.5L 300M 16.23@ 86.97 mph
Re: vapor lock / carb boiling in the bowl how to tell d [Re: GO_Fish] #74551
06/16/08 07:56 PM
06/16/08 07:56 PM
Joined: May 2004
Posts: 752
North of the Motor City
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Not to hijack, but my buddy has a '65 A100 Pick-Up with a 360/727 and a Holley 4bbl.

When driving all is good. Sitting in traffic (Woodward DreamCruise) the engine starts to bog and will stall, but will immediately re-start. As long as the rpms are higher it's OK. Put it in gear (auto) and it bogs and stalls again, and the process repeats.

He has shielded the fuel line from the pump to the carb, added header wrap, and created a fan shroud to no avail. Don't know if he has the intake crossover blocked or not (he purchased the truck as a turn-key). Does this sound like vapor-lock? If not what might it be?

Re: vapor lock / carb boiling in the bowl how to tell d [Re: DartGTDan] #74552
06/16/08 08:02 PM
06/16/08 08:02 PM
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
RapidRobert Offline
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are you running "gasahol"(10% ethanol,90% gasoline).


live every 24 hour block of time like it's your last day on earth
Re: vapor lock / carb boiling in the bowl how to tell d [Re: DartGTDan] #74553
06/16/08 08:19 PM
06/16/08 08:19 PM
Joined: Jul 2003
Posts: 6,167
Maryland
GO_Fish Offline
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Quote:

When driving all is good. Sitting in traffic (Woodward DreamCruise) the engine starts to bog and will stall, but will immediately re-start. As long as the rpms are higher it's OK. Put it in gear (auto) and it bogs and stalls again, and the process repeats.





Have him install a clear plastic or glass fuel filter. Could be a weak fuel pump. Better yet have him install a fuel pressure guage.

I'm in the process of installing a Carter mechanical "street" pump as the stock LA pump is not keeping up at high rpm's. When my 360 is hot, it also sputters and tries to quit at or near idle. A quick look at my clear gas filter shows the filter is empty with only irregular spurts of gas entering the filter.


Scott B. "I'm a self-made man... I started with nothing, and I still have most of it!" 68 360 rusty B'cuda 'vert (GO Fish)13.59@ 98.72 mph 69 340 GTS stock 14.18@ 95.60 mph 01 5.9L Ram 1500 Quad Cab 4x4 01 3.5L 300M 16.23@ 86.97 mph






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