Carburetor overflow

Forum rules
Please do not start new topics here, but here: New Panhead and Flathead topics
Post Reply
Cotten
Posts: 6788
Joined: Mon Aug 26, 2002 9:09 am
Location: Central Illinois

Carburetor overflow

#1

Post by Cotten » Fri Nov 16, 2012 3:03 am

Even though it is the petcock's job, Folks,

Some still complain of drool from carburetors upon short periods of sitting, inspite of a floatvalve that passes the "suck test".
(As per the manuals, the bowl is inverted, and inspection requires intimate contact upon the inlet.)

I may have found one culprit overlooked, that may explain a few mystery puddles.
MAGNETK1.jpg
Justified by peer review or not, Liberty must now be charge to degauss all floatvalve needles other than our own inventory.

The deeper into Linkerts I get, the more I am humbled.

....Cotten
You do not have the required permissions to view the files attached to this post.



panhead_kicker
Posts: 785
Joined: Fri Oct 03, 2008 2:57 am
Bikes: Pan
FLHP Evo
E-H Super X
Chubble head hack
Servi-car
Topper
Location: Indianapolis

Re: Carburetor overflow

#2

Post by panhead_kicker » Fri Nov 16, 2012 3:18 am

Cotten wrote:Even though it is the petcock's job, Folks,

Some still complain of drool from carburetors upon short periods of sitting, inspite of a floatvalve that passes the "suck test".
(As per the manuals, the bowl is inverted, and inspection requires intimate contact upon the inlet.)

I may have found one culprit overlooked, that may explain a few mystery puddles.
MAGNETK1.jpg
Justified by peer review or not, Liberty must now be charge to degauss all floatvalve needles other than our own inventory.

The deeper into Linkerts I get, the more I am humbled.

....Cotten
I'll bite... are you thinking a magnetized needle will pick up garbage ferrous from the gas system, preventing it from seating properly? And, what about this realization is humbling? Were OEM needles not steel?

Panacea
Posts: 1821
Joined: Fri May 24, 2002 1:00 am
Bikes: 64FL 99FLHR 01FXSTD
Location: Mpls. MN.

Re: Carburetor overflow

#3

Post by Panacea » Fri Nov 16, 2012 3:31 am

Just curious, is the seat also magnetic, or even ferrous?

jdpan
Posts: 459
Joined: Tue Sep 08, 2009 2:20 am
Bikes: 1952 Custom swingarm panhead
Location: Austin Tx.

Re: Carburetor overflow

#4

Post by jdpan » Fri Nov 16, 2012 3:43 am

How do you plan to degauss said needles?

58flh
Posts: 3332
Joined: Sat Jun 26, 2010 1:54 pm
Bikes: 1958flh 1969sporty,had a knuckle but sold back to original owner
Location: NEW JERSEY

Re: Carburetor overflow

#5

Post by 58flh » Fri Nov 16, 2012 10:02 am

Nice one Cotton!--- ?--if needle becomes magnetized, how strong of a STICK would it have?, also wouldnt it discharge some thru the pin?--(i dont know!)--But I think it would have to be one hell of a magnetized needle to overcome the float in the gas!, then again I never tried it!--very intresting, curious to see where this goes.----Richie

58flh
Posts: 3332
Joined: Sat Jun 26, 2010 1:54 pm
Bikes: 1958flh 1969sporty,had a knuckle but sold back to original owner
Location: NEW JERSEY

Re: Carburetor overflow

#6

Post by 58flh » Fri Nov 16, 2012 10:07 am

58flh wrote:Nice one Cotton!--- ?--if needle becomes magnetized, how strong of a STICK would it have?, also wouldnt it discharge some thru the pin?--(i dont know!)--But I think it would have to be one hell of a magnetized needle to overcome the float in the gas!, then again I never tried it!--very intresting, curious to see where this goes.----Richie
As Pan-kicker said sounds probable that a small piece of whatever might stick to it!--But all that fuel flowing past at a steady 60mph would wash it away--you think?

Cotten
Posts: 6788
Joined: Mon Aug 26, 2002 9:09 am
Location: Central Illinois

Re: Carburetor overflow

#7

Post by Cotten » Fri Nov 16, 2012 2:37 pm

P_K!

Any time a customer has a complaint, it is humbling.
I read somewhere that the needles were Monel, but Scrap would have to test several for us, as there is a variety.
My Monel round stock is slightly magnetic.

Panacea!

The seat is brass.

Jdpan!

I have a conventional demagnetizer, but for these I may put a new power cord upon a jeweler's coil from the dumpster.

Richie!

The problem is when sitting (with a poor petcock).
Rust flakes are the most likely objects to hold the valve open enough to seep. The weight of a flake might be a thousandth of the weight you see suspended in my photo.

...Cotten

Mr.Big
Posts: 130
Joined: Sat Aug 07, 2010 11:50 pm
Bikes: 1952 FL
Location: Texas

Re: Carburetor overflow

#8

Post by Mr.Big » Fri Nov 16, 2012 5:38 pm

No offense Mr. Cotton but if rust flakes are causing a problem with the needle and seat than wouldn't the prudent thing to do is eliminate the rust from the fuel system like the tanks and fuel lines? And talk about wreakin' havoc with all the small openings in the carb.

I do know that leakage at the needle can be a maddening problem and cause the bowl to overflow but I've found that the viton tipped needle and seat sold by Starklite is a superior product to the steel units.

Jus' sayin'........ :wink:

Cotten
Posts: 6788
Joined: Mon Aug 26, 2002 9:09 am
Location: Central Illinois

Re: Carburetor overflow

#9

Post by Cotten » Fri Nov 16, 2012 6:07 pm

And Richie!

If a motor gets 30 mpg,
and 60 mph is a mile a minute,
then it takes a half an hour for the valve to pass a gallon of fuel.

That's about a double-shot trickled through in a full minute.

The cycling of the float probably does more to keep the needle clean than the flow!

And Mr. Big!

I cannot possibly request every carb rebuild to be accompanied by gastank cleaning.
Even the manifold issue does not allow that, although I try.

Starklite's needle is indeed holding well in my test vial, although I confess that I have not been changing the fuel often.
However my philosophy has two requirements, whether sensible or not:

First, to be as faithfull to original design as possible...
(We all know that technology marches on of course!)
And to present as few targets for digestive fuel as possible,
not only now, but for the future. Anything "soft" is subject.

If anything can bite, it will.

One question that arises is how can "Viton" be black OR red?

Even if Starklite's were "perfect", I cannot justify the expense of replacing each and every valve assembly that is serviceable, but magnetized!

....Cotten

Cotten
Posts: 6788
Joined: Mon Aug 26, 2002 9:09 am
Location: Central Illinois

Re: Carburetor overflow

#10

Post by Cotten » Sat Nov 17, 2012 1:59 am

Electricity mystifys me, Folks.

So I keep it primitive if I can:
DMAGCTLG.jpg
I push the button,
DMAG1.jpg
and there is no hum or buzz until I pass the needle through the coil with a set of hemostats insulated with vinyl tubing over its jaws.
It takes two passes, through and back, to reduce the needle's effect upon a compass needle to minimal.

A compass tells me the metal still has its "magnetism", but its polarity has been moved from its ends to its center.

No rebuild is complete without a demagnetized floatvalve needle!

....Cotten
You do not have the required permissions to view the files attached to this post.

Scrap
Site sponsor
Site sponsor
Posts: 575
Joined: Fri Jul 03, 2009 7:07 am
Bikes: 1957 FL
1980 FLT
74 FXE
2017 road glide
1971 Bonneville
Location: Pawtucket

Re: Carburetor overflow

#11

Post by Scrap » Sat Nov 17, 2012 2:38 am

[quote="Cotten"]P_K!

Any time a customer has a complaint, it is humbling.
I read somewhere that the needles were Monel, but Scrap would have to test several for us, as there is a variety.
My Monel round stock is slightly magnetic.

R-Monel is magnetic, K-Monel is not. If you're serious, I'd be happy to test. There is a school of thought that believes in the healing power of magnetism. Magnetic wrist bands, magnetic shoe sole inserts , magnetic float valves. Heck, if it can heal bodily fluids, why not petroleum fluids. Perhaps L&L was anticipating the low grade gasoline we now use.

Huck
Posts: 638
Joined: Tue Mar 15, 2011 5:35 pm
Bikes: 58 hd
91 hd
09 custom
Location: Wake Forest NC

Re: Carburetor overflow

#12

Post by Huck » Sat Nov 17, 2012 2:40 am

$6.50? how much for shipping?

jdpan
Posts: 459
Joined: Tue Sep 08, 2009 2:20 am
Bikes: 1952 Custom swingarm panhead
Location: Austin Tx.

Re: Carburetor overflow

#13

Post by jdpan » Sat Nov 17, 2012 2:47 am

Interesting...
http://www.ebay.com/itm/Demagnetizer-Gu ... 2a25c0dc33" onclick="window.open(this.href);return false;

Cotten
Posts: 6788
Joined: Mon Aug 26, 2002 9:09 am
Location: Central Illinois

Re: Carburetor overflow

#14

Post by Cotten » Sat Nov 17, 2012 3:33 am

Scrap!

I have a small collection of throttle bushings set aside for testing as well, if it is convenient.
And I would be curious to know if my modern Monel stock is really what I paid for...

Jdpan!

Great Plan B, since I have a basket full of soldering guns.
I wonder if I could degauss a whole crank assembly with this:
DEMAGHUP.jpg
....Cotten
You do not have the required permissions to view the files attached to this post.

Scrap
Site sponsor
Site sponsor
Posts: 575
Joined: Fri Jul 03, 2009 7:07 am
Bikes: 1957 FL
1980 FLT
74 FXE
2017 road glide
1971 Bonneville
Location: Pawtucket

Re: Carburetor overflow

#15

Post by Scrap » Sat Nov 17, 2012 6:54 am

If you would like to know the type of metal or alloy you have in question, I have access to an X-Ray Fluorescence analyzer which provides non destructive testing of the sample. It spits out the commercial name of the sample, e.g. EC Copper, CP Titanium, 6-4 Titanium, 304 stainless steel, 316 stainless steel, Monel 600, Monel 400, Inconel, 6063 Aluminum, 6061 Aluminum, etc, etc...also the percentage of every element contained in the sample. Please PM me for details. There is no cost to members of the forum, if you want the sample back, include an SASE.
Sam

Post Reply

Return to “Carburetor/Fuel system”