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GrahamL
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Joined: 18 Jun 2007
Posts: 4
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 Posted: Mon Jun 18, 2007 1:44 pm Post subject: 40 DCOE Problems |
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Hi,
I have a Ford XFlow fitted with twin 40's and have just rebuilt the engine. I've had the car for 3 years now and last season I noticed a strong smell of fuel after a run out, but couldn't really see where it was coming from.
Anyway after the rebuild and clean up I have noticed that fuel was dripping back out of the air filters. On investigation the source seems to be fuel coming back out of the trumpets.
Seems to do it on tick over or when driven hard, although the car ticks over and runs very well.
All help appreciated
Graham |
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bigjim5551212
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Joined: 11 May 2007
Posts: 53
Location: Vancouver Canada
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| Posted: Mon Jun 18, 2007 5:09 pm Post subject: |
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you have either one of several things
1- float level is too high
2- fuel pressure is too high
3- dirt in the needle valve
4- limit needle valve travel to 2mm
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Jim Hilton
Overseas Distributing
Vancouver Canada
1-604-879-6288
www.overseas-auto.com
www.weberjets.com
jim@overseas-auto.com
Always on line MSN Messenger z5551212@hotmail.com |
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GrahamL
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Joined: 18 Jun 2007
Posts: 4
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| Posted: Mon Jun 18, 2007 6:17 pm Post subject: |
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| bigjim5551212 wrote: | you have either one of several things
1- float level is too high
2- fuel pressure is too high
3- dirt in the needle valve
4- limit needle valve travel to 2mm |
Hi Jim,
Thanks for getting back to me,
1- Float level is set at 12mm with plastic floats
2- Just fitted Filter King set at 2.5-3 PSI
3- Must check
4- How do I do this it's way over 2mm
Thanks in advance
Graham |
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bigjim5551212
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Posts: 53
Location: Vancouver Canada
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| Posted: Mon Jun 18, 2007 7:24 pm Post subject: |
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you take the lid of the carb off. you will notice that the float moves up and down for a long way. see the needle valve moving. there is a tab on the back of the float that rests on the back of the needle valve. you can bend that tab to control the float drop and with that the movement of the needle valve.
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Jim Hilton
Overseas Distributing
Vancouver Canada
1-604-879-6288
www.overseas-auto.com
www.weberjets.com
jim@overseas-auto.com
Always on line MSN Messenger z5551212@hotmail.com |
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GrahamL
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Joined: 18 Jun 2007
Posts: 4
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| Posted: Mon Jun 18, 2007 7:47 pm Post subject: |
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That's great, thanks for the info I'll take a look.
Regards
Graham |
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GrahamL
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Joined: 18 Jun 2007
Posts: 4
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| Posted: Thu Jun 21, 2007 7:34 pm Post subject: |
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Hi Jim,
Quick update, I've checked the needle valve for dirt and it's clean, also checked the travel of the needle and that appears to be just under 2mm. However there does appear to be some ware on the needle.
One other thing I noticed, when the car is ticking over, no 3 and no 1 barrels have fuel droplets dripping from a brass port in front of the butterfly. Not sure if this is significant or not.
Cheers
Graham |
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bigjim5551212
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Joined: 11 May 2007
Posts: 53
Location: Vancouver Canada
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| Posted: Thu Jun 21, 2007 10:39 pm Post subject: |
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yes, that is significant. That would tell me that the pump jets are leaking. sometimes the seat where the anti bleed back ball sits becomes pitted/worn/damaged. You need to make sure there is no trash or pitting on the seat. normally, there should only be fuel there when the pump circuit is working or when the engine is at high speed, where the jet is used as high speed enrichment.
_________________
Jim Hilton
Overseas Distributing
Vancouver Canada
1-604-879-6288
www.overseas-auto.com
www.weberjets.com
jim@overseas-auto.com
Always on line MSN Messenger z5551212@hotmail.com |
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simon bond
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Joined: 27 Mar 2008
Posts: 4
Location: devon uk
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| Posted: Mon Mar 31, 2008 10:32 pm Post subject: i had the same problem |
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hi
i am amzaed to find that someone out there has got the exact same problem as me.
i too have a 1600 xflow running 40dcoe's which also drip fuel.
i found that after running the car that the trumpet socks were dripping with fuel.
i removed the socks and just ran open trumpets but the fuel was still dripping from them.
People suggested that the carbs were too tight on the manifold and that they were causing the fuel to foam from vibration.
People suggsted it was runing way too rich
people said it was just one of those things...
i took it and got it set up on a dyno and this reduced the problems but it is still there sometimes so i have found the responses you have had really useful.
i cant remember what jetts im running but i will look and let you know
cheers
simon |
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bigjim5551212
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Posts: 53
Location: Vancouver Canada
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simon bond
New user
Joined: 27 Mar 2008
Posts: 4
Location: devon uk
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| Posted: Mon Mar 31, 2008 11:36 pm Post subject: |
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| i have checked fuel presssure and it is around 3psi so im not sure the pressure is the problem |
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bigjim5551212
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simon bond
New user
Joined: 27 Mar 2008
Posts: 4
Location: devon uk
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| Posted: Tue Apr 01, 2008 10:56 pm Post subject: more info please |
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hi
thanks for the info
could you tell me the best way to measure the float hight and how to set them properly.
can you also give me any other hints on what to look at.
also could you suggest wat jets and tubes you would use on a ford 600 xflow?
thanks again |
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bigjim5551212
Enthusiast
Joined: 11 May 2007
Posts: 53
Location: Vancouver Canada
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| Posted: Wed Apr 02, 2008 5:34 pm Post subject: |
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If you have brass floats, you measure 8.5 mm from the lid of the carb with the gasket in place to the top of the float. Limit the Needle Valve travel to 2mm. If you have a plastic float, measure 12mm from the top of the float to the lid of the carb with the gasket in place. limit the needle valve movement to 2mm.
for jetting
start with
30 choke
130 main
F16 emulsion
180 air
45 pump
45F9 Idle
_________________
Jim Hilton
Overseas Distributing
Vancouver Canada
1-604-879-6288
www.overseas-auto.com
www.weberjets.com
jim@overseas-auto.com
Always on line MSN Messenger z5551212@hotmail.com |
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