| [ Total Views: 954 | Total Replies: 8 | Thread Id: 48086 ] |
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 jeremy
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| posted on January 18th, 2006 at 04:28 PM |
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2L kombi Dual Carby Woes
I have a 2L Manual kombi with standard dual Solex carbies that has a very bad flat spot just above idle.
On close inspection of the Air Correction Jets I have a different one in each carby. 175 in one and a 160 in the other.
I have a 'Gregorys' manual and it lists what jets should be in what but I can't find the Carby indentification number.
Are there any Carby Guru's out there who know enough about Jet sizes of Solex Carbys to offer advice?
Extra info
Main Jets 132.5 same in both
Pilot Jet 50 same in both
These sort of problems remind me why I love fuel injection :thumb
Jeremy
[ Edited on 18-1-2006 by jeremy ]
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modulus
A.k.a.: Peter Hill
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| posted on January 18th, 2006 at 05:19 PM |
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| Quote: | Originally
posted by jeremy
Are there any Carby Guru's out there
[ Edited on 18-1-2006 by jeremy ]
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Not Me! However, it's worth noting that the standard 'twin' solexes are not twins at all, but rather 1 and 1/2 carburettors, with the left one
responsible for slow running.
That said my Haynes manual lists AC jet as 160 for the 2litre manual, mains as 132.5, pilot jets as 52.5.
There are many jet size combinations over the period when VW were trying to meet evolving emissions standards.
BTW, is your distributor vac. advance working properly?
hth
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jeremy
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| posted on January 18th, 2006 at 07:55 PM |
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Yep the vac advance is working and the dizzy has no slack or looseness in the shaft.
I pinpointed the Carbys (the left one) because if I hold the choke 1/4 closed on the left carby the engine revs wthout the flat spot.
So I in cleaning out the jets I noticed the different jet sizes.
It was left carby that had the bigger air correction jet (175) and appeared to be running a little lean.
It makes sence to me, I think. LOL
PS where can I buy jets from???
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ACE_76
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| posted on January 18th, 2006 at 08:20 PM |
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Don't know anything about Kombi's, but type 3's with twin Solexes's always had a bigger air-corrector jet on the LH side (passenger's side) carb.
(Except '71 on according to one Manual, but not the other). I eventually decided this must be as the main on that side was always slightly bigger
-- in order to make no. 3 cylinder slightly richer (so it runs cooler).
VW must have got worried about no. 3 cylinder early on as all later AirCooled engines seem to have at least some bias to helping it run a bit cooler.
The type 3's spec's above were for air corrector jets of 155 or 150 on LHS, and 120 on RHS. The corresponding mains are only slightly different eg.
130 LHS & 127.5 RHS.
Air Correction jets are only meant to affect the running of the engine at higher rev's, and so probably have nothing to with flat spots at low to
mod. revs. Maybe one of the mains is partly blocked, or an accelerator-pump not working?
If you're going to change jets, there's a good technical article at http://www.aircooled.net "How to Jet your Carburretor/s". Describes the function/s and characteristics of idle, main,
air-correction, and accelerator-pump; & how to experiment. We've fiddled around with jet changes recently. Came back to settings exactly as per the
Manual on one car (1600; single Solex 34 PICT-4: 127.5 main), BUT had to use at least 140 mains instead of the standard 127.5/130 on a 1640 with twin
Solex 32 PDSIT's. Probably depends on the individual engine! (I think you should have any other "issues"/faults sorted out before you start to
fiddle with carb's.)
[ Edited on 19-1-2006 by ACE_76 ]
[ Edited on 19-1-2006 by ACE_76 ] |
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modulus
A.k.a.: Peter Hill
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| posted on January 18th, 2006 at 08:50 PM |
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| Quote: | Originally
posted by jeremy
PS where can I buy jets from???
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Mick Motors in Qld., one of this forums sponsors, seems to stock Solex jets, judging from:
http://www.mickmotors.com.au/CAT1.htm
hth
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ragged
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| posted on January 18th, 2006 at 11:14 PM |
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What's your location?
Cheers Dave
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jeremy
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| posted on January 19th, 2006 at 02:06 PM |
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| Quote: |
What's your location?
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Toowoomba QLD
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azz
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| posted on January 19th, 2006 at 02:40 PM |
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Ive had huge issues with the exact some carb's and running problems
After getting the carbs totally overhauled the mechanic said i had 135 jets that had been drilled out to 155 with was not supposed to be like that.
He replaced them back with 135's but I dont know where he got them
Mine IS an automatic though if that makes a difference
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General_Failure
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| posted on January 20th, 2006 at 10:57 PM |
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I have an 1800 dual solex. I feel your pain. It's back to it's old trick of dying when I put my foot on the accelerator.
Surprisingly enough, the gregory's manual gives a fairly decent description of how they work.
If at first you don't succeed. Build, build again.
Vehicle: 1975 Special order delivery walkthrough panel based LCA pop-top camper. Motor: Nippon 1.8L Single port Wasserboxer, Transmission: 3 rib 002.
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