Sherman,
Sounds like you have a float valve sticking (still). Bad idle and
flooding at the mouth of the carb are good indicators of something
making the float valve stick. I would guess you've got more black specs
in your float chambers. You can pull them without removing the carbs.
Cleaning them once is not going to get rid of the problem. I didn't see
you mention doing anything to get the varnish out of your fuel system.
Did you add any fuel filters between the fuel pump and the carbs? Did
you try the BG44K to desolve the varnish? Your symptoms mirror the
problems I was having. You may have to just empty the float chambers a
few dozen times like I did, install the fuel filters, add the BG44K to
your fuel tank and hope the black specs (aka varnish particles) get
removed. Oh and if you're running grose jets instead of the standard
float valve go back to the standard one. Grose jets with their many
little holes beg to get plugged up by the little black specs.
Bud
"Taffel, Sherman" wrote:
>
> Just an update as to my progress (and lack of) with the ZS carb saga. Once
> again I have pulled the rear carb after 'cleaning' of the black specs and
> reinstallation provided 'No Joy'. One interesting tidbit with regards to
> mixture and backfire behavior is "if it backfires thru the carb - its too
> lean, if it backfires in the exhaust - its too rich".
>
> To review, the car will start and run, more often than not immediately(basic
> mixture OK)- but the idle fluctuates wildly.
>
> My Thinking -my mental picture is: float dropping-fuel bowl filling, shuts
> off, MAYBE VALVE STICKING-then opens, float dropping, MAybe float doesn't
> close needle jet-floods, then closes, CYCLE REPEATS).
>
> When I goose the butterfly throttles- she'll either zoom up wonderfully,
> usually if I add choke, or stall and die-usually with a backfire- a bad
> backfire-usually in the exhaust or behind. Sometimes I see floooding
> (leaking gas from the mouth- as if the float is not closing the float valve,
> or the float valkve is not closing), but not always. This again points to
> the float valve/jet or the float.
>
> Conversation with Joe Curto Wednesday-he suggested weighing the float-said
> it should be about 15 grams, no more-. He said get back to him in a couple
> of days, if its not the float- he'd send me another float valve/jet.
>
> I pulled the valve cover to check for bent pushrods and check the valve
> train operation- no problem.
>
> So last night I swapped an old float valve- and the car actually,
> periodically, ran a little better- enough to move it 'up the incline in the
> drive/parking pad, about two feet at a time-but more than I could do since
> the Tow Truck returned her/us home from the TR aborted TRA 2000 trip- so at
> least I can put another car behind it again, and keep one more off the
> street.
>
> So at 10:30 PM last night, I pulled the carb again, and the float bowl was
> again full- (hate the new gas effervesence- was much better in the 60's and
> 70's.
>
> Packaged up the float in paper towels and a ziplock to take to the post
> office to finagle a 'computerized weigh job'. This mornig I got the float
> weighed (at the Post Office) = .5 ounces, which converted = 14.1747 grams.
> Got to work, Called Joe- he says that should be OK then, he'll send me a new
> float valve but says he just had a problem with (carbs) on an ALVIS- doing
> the same thing and he's convinced the problem is, as it was on the ALVIS- a
> sucked in intake manifold gasket.
>
> That certainly would explain the 'starvation and lack of syncronized hiss
> form the thottle mouth'.
> So that's what I'll be doing this evening - taking the intake manifold off
> to check the gasket.
> (All the manilfold attach 'clamps' and nuts appear and tested 'tight'- but
> one never knows with a Triumph!
>
> Will advise!
>
> Sherman
>
> Sherman D. Taffel
> Columbia, MD
> CT40054L
>
> L=Longing to make Bowie with the TR
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