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Weber Carbs - Float Setup

| 2 Jun 2017 09:30 | Edited by: Eugene | #1
At Le Bounty

Been playing with my twin 45 Webers...

I started having an issue with Eugene 'spluttering' on fast/sharp right handers/corners, but as it was a progressive issue I didn't really think much of it to start with - just assumed it was normal with 'carbs'.
Anyway, decided to give the carbs a check over, and spend a lot of time chatting with Webcon.
They suggested 2 possible issues - incorrect float height, and the possibility that the 'cold start' circuit was dumping petrol into the manifold due to high G forces in right hand corners (right hand as I have a Zetec with the carbs on the driver's side/right hand side.)

So, ordered 2x DCOE cold start device elimination kit as the first step, and fitted: http://www.webcon.co.uk/shopexd.asp?id=15057

While fitting this kit I also looked into the float height, and became concerned that the method used to set the height is a lot less than ideal, so started looking into ways to actually measure the fuel height in the float chamber, as that is really what you are setting...
And after a bit of Googling found this:



But, working out the actual height of the fuel inlet holes 25mm would have the fuel running down the jets just about all the time...
So, a bit more Googling found comments on the ideal fuel height being 29mm from the top of the float chamber, not 25mm: http://www.classiczcars.com/topic/44512-setting-weber-dcoe-fuel-level-with-caliper/

And then found this pdf document, also stating 29mm: https://centerlinealfa.com/sites/centerlinealfa.com/assets/files/default/dcoe_setup.p df

So, I tested both, and 25mm cause a lot of spluttering and hesitation, while 29mm cured everything!

Problem solved!

Obviously, removing the cold start devices may have helped, but the result is a very happy Eugene, running better than I can remember.
(Also check out the Air/Fuel Ratio thread: http://www.7-dna.com/forums/index.php?action=vthread&forum=2&topic=1109 and the Spark Plug thread: http://www.7-dna.com/forums/index.php?action=vthread&forum=2&topic=440)

Eugene
Le Presidente
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| 2 Jun 2017 09:34 | #2
At Le Bounty

Looks like El Presidente is working up a thirst today
Storm Car Covers
stormcarcovers.co.uk
Never Knowingly Under Covered
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| 2 Jun 2017 09:58 | #3
At Le Bounty

Friday!!!!

Eugene
Le Presidente
Le BOG Club
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| 2 Jun 2017 10:17 | #4
At Le Bounty

The sun has already past the yard arm here
Off for a little clay practise at 2
Storm Car Covers
stormcarcovers.co.uk
Never Knowingly Under Covered
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| 2 Jun 2017 10:27 | #5
At Le Bounty

Yeah - you do need a fair bit of practice...

Eugene
Le Presidente
Le BOG Club
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| 2 Jun 2017 10:32 | #6
At Le Bounty

Doing well on Tuesday, might have to invest in a semi auto
Storm Car Covers
stormcarcovers.co.uk
Never Knowingly Under Covered
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| 2 Jun 2017 20:06 | #7
On ferry

Or much BIGGER clays, El presidente and working , are there two then have a great weekend chaps.
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