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Guest · Posted: Thu Jun 26, 2003 5:47 am Post subject: Weber Carb float level.

All.
A silly question perhaps, but a genuine one.
When setting the float level should the float rest in the fully closed i.e with the spring in the float needle compressed or should it be when the valve is 'just' contacting its seat (sprinh uncompressed)?
I have looked everywhere I can think of to find the answer to this, but have failed.
Thanks
Dave.

RBL · Posted: Thu Jun 26, 2003 10:50 am Post subject:

Hi Dave

You need to take two measurments. Hold the carb cover vertical so the float hangs from the fulcrum. Take one measurment with the float level arm just touching the needle ball (without compressing it) and the other measurment with the float hanging away from the carb cover so that the tab touches the side of the needle valve assembly.

hope this helps. I used the Haynes Weber carb manual (code 10240) for rebuilding and tuning my carbs. Let me know if you want to check the adjustments distances (assuming this book has your carbs in)
Rich

Guest · Posted: Thu Jun 26, 2003 5:16 pm Post subject:

Thanks for that Rich.
Measurement to be taken with float just resting uncompressed is what I was after.
Good here isn't it?
Dave

RBL · Posted: Thu Jun 26, 2003 11:08 pm Post subject:

No probs Dave, I've had a lot of help from everyone here too.

It'll depend on what carbs you've got, mine are weber 40 IDFs and the measurment you need for these is 10mm from the base of the cover to the top of the float (the corner of the lowest float when hanging vertically if that makes sense)

Good luck, Rich

RBL · Posted: Thu Jun 26, 2003 11:17 pm Post subject:

PS let me know if your carbs are different and I'll look it up.
Rich

Dave (Minari) · Posted: Fri Jun 27, 2003 7:41 am Post subject:

Rich.
They are 40 IDF's on a 1.7 8V on a Minari. The info I found says 11mm when suspended?
I refurbished the carbs and I had (still have?) awful trouble with them being over rich. Fuel consumption down from 38 to 26 MPG. When I refurbed them I didn't have the 'between carb and air filter' gasket, so used one which was in the refurb kit. This wasn't the same shape as the original, and didn't completely seal the top of the carb from the outside atmosphere. It was like having a piece of the gasket missing, (The chokes were sealed though).

I have now put the correct gasket on, but haven't had the chance to do any adjustment or checks.
Is the Haynes Weber book worth having?

Dave
_________________
Retired and working harder than when employed!!! Crap at golf- "Stupid Bl**dy game!"

RBL · Posted: Fri Jun 27, 2003 11:35 am Post subject:

same engine and carbs as mine then (I'm building a Martin and Walker porsche 55 spyder replica)

this book says 10mm and 32.5mm for the two dimensions, It's a good, thick book with a couple of chapters on general carb explanations and 14 pages on the 40IDF, 2 of which are on tuning. If you've already refurbed them it may not be worthwhile, but at least it's a good reference for ongoing servicing. not sure of the cost.

Dave (Minari) · Posted: Sat Jun 28, 2003 6:25 am Post subject:

Rich
Thanks for everything and good luck with the build. If you are at any kit car shows look for my car and look me up.
Have a look at the web site to help identify my car.
Dave
_________________
Retired and working harder than when employed!!! Crap at golf- "Stupid Bl**dy game!"