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 jaksc
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| posted on April 28th, 2007 at 06:05 PM |
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1776 hard to start( Help)
Well i've spent the day replacing a generator with an alternator on my 1776 with twin kadrons. New fuel pump new rod new alt stand and backing
plates. Drove it round the block, Now she runs like a pig. It sounds like it missing or something and is blowing slight black smoke. The manifolds are
also very cold (is that unusual). The only thing i disturbed were the plug leads on 1+2, the fuel hoses and a couple wires on the altenator. I NEED
SOME HELP PLEASE.
Aaron:cry:cry
[ Edited on 28-4-2007 by jaksc ]
[ Edited on 28-4-2007 by jaksc ]
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bushed
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| posted on April 28th, 2007 at 09:56 PM |
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did the rod lengths match?? btw.
checked 1 and 2 not incorrect ??
was it 12 volt b4 adding the alt. if not 6v coil needs upped to 12v!
changing fuel pump could mean rubber hose remnants in line to carbie needle valve ?
check & cln fuel filter
did u check timing ?u may have slightly moved dizzie with all them operations goin on
want any vw bits old but like me, Made in Germany!!!
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jaksc
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| posted on April 29th, 2007 at 06:48 AM |
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Rod length different to the one that came out
I have re-checked 1+2 again
It was 12volt generator before it came out
I will put a new fuel filter on today and check the timing.
I didn't disturb that much so i am at a loss to know what it is. Try again today! I disturbed one of the carbies slightly if it was sucking air would
that have an affect.
Aaron
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jo_tas
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| posted on April 29th, 2007 at 12:21 PM |
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You'd be surprised what you can accidently bump or knock without even knowing when working on a veedub.. so check EVERYTHING!
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bushed
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| posted on April 29th, 2007 at 01:50 PM |
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esp fuel supply
and timing
want any vw bits old but like me, Made in Germany!!!
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sinecure
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| posted on April 29th, 2007 at 05:42 PM |
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Black smoke generally indicates rich fuel mixture, ditto cold manifolds, so I doubt extra air in the mix would be the culprit. Maybe fuel pressure
too high? Or perhaps the old fuel lines were clogged and the carbs were set/tuned to suit this, the new lines have maybe freed up the flow a bit.
Also possible plug or lead failure under load.
All serious "maybe's" of course, but worth checking.
A POSSE AD ESSE.
I live in my own little world, but it's okay, they know me here.
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jaksc
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| posted on April 29th, 2007 at 06:00 PM |
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Spent the day trying to work out what i had done wrong. Took the new pump off and double checked the stroke. I was out by .1mm. So i put a another
gasket to pack it up and got it just right at 4mm. I have also came down to the conclusion that it is slightly flooding for some reason. There seems
to be plenty of pressure from the new pump. So it is off to the mechanics tommorrow as i need the car. I think it is flooding but still i am only
guessing.
Aaron
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lugnuts
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| posted on April 29th, 2007 at 07:23 PM |
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Fuel pressure should be 1.5-2lbs according to Mr.Kadron,adjust with gaskets to match.
Dont listen to what they say,just watch what they do.Oh yeah ive NEVER finished anything ive started.:o
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LIFE IN THE LOW LANE
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| posted on April 29th, 2007 at 08:49 PM |
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Got some crap caught under a needle and seat??
[size=4] ACCEPT THAT SOME DAYS YOU ARE THE PIDGEON AND SOME DAYS YOU ARE THE STATUE[/size]
Alder Outlaws VW Racing - check it out on fb!!
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jaksc
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| posted on May 2nd, 2007 at 06:08 PM |
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Looks like the new pump is putting out too much pressure and flooding the carbs. Maybe another new pump??? What are my options.
Aaron
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bushed
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| posted on May 2nd, 2007 at 10:32 PM |
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just a stab hre...
u said rod lengths were different
why?
is the pump a diff brand?
want any vw bits old but like me, Made in Germany!!!
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jaksc
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| posted on May 3rd, 2007 at 06:39 PM |
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Tested the pressure today and it was way to high and was flooding the carbs. Bought another new pump(different brand again) and it solved the problem.
What is the difference between pumps???. Do i need to quote a fuel pressure when buying one???.
Aaron
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ctefeh
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| posted on May 3rd, 2007 at 08:25 PM |
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Maybe a lot of difference
Jaksc,
A lot depends on what your new fuel pump rod measured, the pumps pivot pin location and actuating arm manufacturing tolerances and how many
gaskets you wind up using. A whole lot. Also there's where they are made can have an influence. For arguments sake a mexi Bocar might put out 3.5 psi
max whereas a brazil brosol could do 4.5, and you need to cut down the rod or stack gaskets to lower the psi. I had to cut my rod to 100mm (was
101.1mm as supplied) and use 1 more gasket to stop my carb flooding. FYI I swapped a gennie pump and rod for an alternatior pump and rod.
Ctefeh
[ Edited on 3/5/2007 by ctefeh ]
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jaksc
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| posted on May 7th, 2007 at 08:34 PM |
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Ctefeh
did you come up with the rod length and gaskets through trial and error or is there a formula to use to get the exact fuel pressure you want.
Aaron
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Craig Torrens
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| posted on May 7th, 2007 at 09:03 PM |
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VW had two sizes for the rod length.:thumb
If you look at the arm within the pump (turn the pump upside down and look in it!) you will notice one sits lower than the other. The short rod length
matches the pump which has the arm level with the base of the pump housing, the long rod for the pump where the arm sits about 5 to 10mm in.
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ctefeh
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| posted on May 7th, 2007 at 09:42 PM |
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Trial and error sort of...
Jaksc,
A generator rod is supposed to be 108mm, and an alternator rod is supposed to be 100mm. I knew I had an alt pump and so needed a 100mm rod to
start. After fitting up and measuring stroke etc I figured on 1 gasket but wound up using 2. I have a lathe so rod trimming isn't a problem.
Measured it with a psi gauge after sorting needle & seat problems (I wound up using the original needle & seat as the new one wouldn't shut off
properly).
For a glazed-eye read of pumps/rods/alt/gens try this....
http://forums.aussieveedubbers.com/viewtopic.php?tid=50478
Ctefeh
[ Edited on 7/5/2007 by ctefeh ]
[ Edited on 7/5/2007 by ctefeh ]
[ Edited on 7/5/2007 by ctefeh ]
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jaksc
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| posted on May 9th, 2007 at 08:02 PM |
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That thread was excellent. Wish i had of known all that before i started. Thanks Aaron
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ctefeh
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| posted on May 9th, 2007 at 09:12 PM |
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But wait...there's more!
Jaksc,
The Kads being pressure sensistive doesn't help much as it's another spanner in the works to deal with. Have you thought about a Holley
adjustable low pressure regulator?
Bit spendy but it would be a definite fix and you can transfer it between cars or on-sell if you wish.
Regards
Ctefeh
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sinecure
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| posted on May 9th, 2007 at 10:18 PM |
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| Quote: | Originally
posted by ctefeh
Jaksc,
The Kads being pressure sensistive doesn't help much as it's another spanner in the works to deal with. Have you thought about a Holley
adjustable low pressure regulator?
Bit spendy but it would be a definite fix and you can transfer it between cars or on-sell if you wish.
Regards
Ctefeh
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Agreed, when I set up twin Mikunis on my old Dat16, the only thing that solved the pressure mismatch was a Holley regulator.
A POSSE AD ESSE.
I live in my own little world, but it's okay, they know me here.
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jaksc
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| posted on May 11th, 2007 at 07:40 PM |
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Seem to have fixed the problem with another new fuel pump. Will look in to the pressure regulator also as a safeguard. Thanks heaps. There is more to
this than i first thought.
Aaron
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