|
Sponsored Links (Register now to hide all advertisements) |
|
|
Thread Tools | Display Modes |
10-01-2013, 06:50 PM | #1 |
Junior Member
Join Date: Oct 2013
Posts: 4
|
Flooding flathead carb's
Most flathead owners have experienced the flooding carb problem. I have tried every method under the sun to fix this issue-with mixed results. Yes-the float is at the proper adjustment-and this is not happening as a result of an overheated engine. After shut-off--and after a few minutes-the carb will dribble fuel out the rh side-throttle-end of the throttle shaft-running down onto the intake manifold. This is of course flooding the engine-and washing fuel into the cylinders-and thinning the oil-as well as making it a hard starter. This is on a 59 carb-atop a 46 59ab V8. Does anyone have an answer to this problem-? I've lowered the float-more than spec-and used gross-jets-and you name it in an attempt to solve this. I say again-I've had the same problem on various flatheads-of all years and engines. It seems universal. Anyone have a good solution to this--?? Thanks
|
10-01-2013, 07:23 PM | #2 |
Senior Member
Join Date: Oct 2010
Location: Orem, Utah
Posts: 5,762
|
Re: Flooding flathead carb's
Try opening the hood when it's not going to be too unsightly, like in the garage at the end of the day. That's the only thing that's worked for me. It's the heat build up under the hood after shutting down that causes mine to do just what yours is doing.
__________________
Prof. Henry (The Roaming Gnome) "It is good to have an end to journey toward; but it is the journey that matters, in the end.” *Ursula K. Le Guin in The Left Hand of Darkness |
Sponsored Links (Register now to hide all advertisements) |
|
10-01-2013, 07:36 PM | #3 |
Junior Member
Join Date: Oct 2013
Posts: 4
|
Re: Flooding flathead carb's
Thanks Old Henry-it's heat related for sure. I've heard that the gas actually percolates in the bowl-and spills over. I can't believe these cars could have had this consistent problem when new. My 54 merc has a half-inch bakelite spacer-base under it's holly 4 barrel. I think some kind of insulator where the carb bolts to the manifold may be the ultimate fix. Of course you're raising the carb somewhat-meaning the fuel pump to carb line would have to be changed. As I'm sure you know-hot exhaust passes under the carb-inside the manifold-and this area is what I think stays hot-and maybe gets a little hotter when sitting a few minutes. Thanks for your input--
|
10-01-2013, 07:49 PM | #4 |
Senior Member
Join Date: Oct 2012
Location: oroville calif.
Posts: 1,453
|
Re: Flooding flathead carb's
if you havent done so already remove intake manifold and plug the two exhaust cross over holes in the block, they are there to apply heat to carb and the ford v/8 doesnt need any more heat applied any where on motor, install a fiber, not plastic phenolic block under carb, usually about an inch thick, another problem is an aluminum manifold transfers more heat and faster to the carb than a cast iron one does
Last edited by ford3; 10-01-2013 at 07:54 PM. |
10-01-2013, 07:50 PM | #5 |
BANNED
Join Date: May 2010
Location: stratford,ct
Posts: 5,971
|
Re: Flooding flathead carb's
Ford changed some of the parts in the later carbs to help aleiveate this ,how good it works I dint know but. Use the HiLift nozzle bars and the necessary diff top section from a later carb.Might help.Ive had customers do this and have had no complaints about the change.Might work. Hi lift bars and idle tubes and a correct top and gaskets would go around $68 . ken ct.
|
10-01-2013, 08:03 PM | #6 |
Senior Member
Join Date: May 2010
Posts: 416
|
Re: Flooding flathead carb's
Sponsored Links (Register now to hide all advertisements)
|
10-01-2013, 08:23 PM | #7 | |
Senior Member
Join Date: May 2010
Location: Wisconsin, USA
Posts: 9,007
|
Re: Flooding flathead carb's
Quote:
These carbs did in fact "boil over" when they were new. I learned the "trick" Ken refers to back in the early 70's. It helps a lot. The parts required are from '49 - '53 carbs.
__________________
"I can explain it for you. However, I can't understand it for you". |
|
10-01-2013, 10:46 PM | #8 |
Senior Member
Join Date: May 2010
Location: Tehachapi, CA
Posts: 361
|
Re: Flooding flathead carb's
A note about the fuel boiling after shut down on the 94 carburetors. The venturis were changed to a round venturis with the Holley 2110 carburetors (I am using the three bolt ecg6's) the round booster venturis can be installed into the 94's by using the jets and etc that come with the venturis. Below is what the Holley 2110 manual says why the change was made. The ECG6 bodies and tops are a little different but the nozzles, venturis and etc will fit into the 94's
. The booster venturi nozzle bars minimize percolation effects by providing a larger main well with a long vertical rise. Percolation occurs on hot days after the engine has been shut down. The fuel in the bottom of the main well is heated, forming vapor bubbles which trap raw fuel between them as they rise. This action drains the fuel from the carburetor and deposits raw fuel in the intake manifold, making it difficult to start the engine. By incorporating larger main wells and longer passages, the bubbles break as they rise. No liquid fuel, therefore, is carried into the hori zontal passage leading to the main discharge nozzle. Vergil
__________________
Bigger fonts to aid in reading |
10-02-2013, 06:59 PM | #9 |
Junior Member
Join Date: Oct 2013
Posts: 4
|
Re: Flooding flathead carb's
Thanks to all for the input-I have a couple 8BA carbs with the taller style nozzle bars-I'll try that first--although I have to say-I've had the same problem with 8BA carb on an 8BA engine in the past-especially in summer heat. Rick
|
10-02-2013, 07:12 PM | #10 |
BANNED
Join Date: May 2010
Location: stratford,ct
Posts: 5,971
|
Re: Flooding flathead carb's
You must use the top with the bump in the casting to allow the left hi-lift bar to clear the top. Supposedly the Booster type bars are even better on this problem. ken ct.
|
10-02-2013, 09:13 PM | #11 |
BANNED
Join Date: May 2010
Posts: 3,019
|
Re: Flooding flathead carb's
Verg,
Many thanks for that post....it is most appreciated. Although I cannot explain why, it has been my experience that excessive clearance between the throttle shaft and the base will also prompt this weeping. Charlie ny |
10-02-2013, 10:00 PM | #12 |
Senior Member
Join Date: May 2010
Location: Australia
Posts: 362
|
Re: Flooding flathead carb's
|
10-02-2013, 10:24 PM | #13 | |
Senior Member
Join Date: Oct 2010
Location: Orem, Utah
Posts: 5,762
|
Re: Flooding flathead carb's
Quote:
__________________
Prof. Henry (The Roaming Gnome) "It is good to have an end to journey toward; but it is the journey that matters, in the end.” *Ursula K. Le Guin in The Left Hand of Darkness |
|
10-02-2013, 11:18 PM | #14 |
Senior Member
Join Date: May 2010
Location: Tehachapi, CA
Posts: 361
|
Re: Flooding flathead carb's
The bump in the top housing that is being mentioned is shown in the picture below ...
Vergil
__________________
Bigger fonts to aid in reading |
10-03-2013, 12:15 AM | #15 |
BANNED
Join Date: May 2010
Location: stratford,ct
Posts: 5,971
|
Re: Flooding flathead carb's
VERGIL,me too thanks you,now guys will know what to use when changing nozzle bars around. Not sure if needed with the Booster type,will have to try tomorrow,never did that before. ken ct.
|
10-03-2013, 10:29 PM | #16 | |
Senior Member
Join Date: May 2010
Location: Colorado
Posts: 1,264
|
Re: Flooding flathead carb's
Quote:
|
|
10-04-2013, 12:14 AM | #17 |
BANNED
Join Date: May 2010
Location: stratford,ct
Posts: 5,971
|
Re: Flooding flathead carb's
|
|
|
Sponsored Links (Register now to hide all advertisements) |
|