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More questions from me because I'm an engine noob.
I've started the rebuild and one decision I've made is to ditch the airbox and Pierburg-Solex single point injection carburettor for something more reliable and efficient.
I don't know what would or wouldn't be suitable and have had words like 'Weber' and '1ltr Fiesta' thrown at me.
The engine is the earlier 1043cc unit that VW used which seems to cause me some issues when getting parts because my car appears to be some sort of crossover model, coming up on the system as having the later engine when in actual fact it has the earlier one.
Advice welcome, especially if you've had personal experience of putting a better carb and filter on one of these engines. It's completely new to me so I don't know what I'm doing.
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I'm running a weber 32tla with autochoke on mine, but mines a late mk2. there are a couple of issues that I've had with it, one is that Ive had to ditch the swirl pot and use a pressure regulator, and Ive had issues with carb icing when I first got it by having a permanent warm air feed from the exhaust. not sure if its plug and play with the earlier models but I can take some pics of the setup if you want.
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Did you convert to autochoke? I'm still on manual with mine. Other than that I'm not sure what the similarities and differences would be, pictures would certainly help if you wouldn't mind  |
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bortaf
Posted a lot
Posts: 4,549
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R.I.P photobucket
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Thanks bortaf. Going to take me a while to get my head around how everything works so I'll do some extra reading on carburettors in general I think.
It has been mentioned briefly by a friend that rejetting might be required for the new carb but he didn't have time to explain to me what that entails. So much to learn!
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dungbug
Posted a lot
'Ooligan!
Posts: 2,852
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What's the issue with the stock carb its got if you don't mind my asking? I've not got much knowledge with watercooled VW's but usually find that stock is best unless you're planning on increasing the engine capicity which would demand more fuel for the extra power. If you're keeping the capacity at 1043 then I'd stick with what it was meant to have. I've tried swapping carbs with different types before & found that it usually creates more problems than it solves, manifold icing was one after ditching the original airbox (the warm air feed was lost in the process which created a problem that wasn't there before)  Have you PM'd Guz for some pointers? He seems to know his onions with watercooled VW's. |
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Last Edit: Nov 7, 2011 14:27:00 GMT by dungbug
Past: 13 VW Beetles from 1967 - 1974
Bay Window Campers (1973 & 1974)
Mini's (1992 Cooper lookalike & 1984 '25 Anniversary)
MK2 Polo Coupe S (1984 & 1986)
MK2 Polo Breadvan (1981 & 1984)
MK4 Escort (1989)
MK2 Granada Based Hearse (seriously)
Fiat Uno 60S (1986) Punto 60S (1998) Cinq (1997)
1998 Yamaha YZF600R Thundercat
2003 Ford KA
Current: 2004 Ford Focus (barely alive)
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It seems to stick open occasionally. Now, I suppose it's true that the issues with the engine on the whole could be making me and others point fingers at the carb as being a weakness when in fact the faults with the engine are making it perform less than adequately.
I don't know enough to give a precise diagnosis beyond what I've been told and what I suspect... not the best place to start from... but the majority of the info I have read is that the Pierburg-Solex on these is just pants and shouldn't be fitted.
I no longer have a warm air feed after the heat sheild (I think that's what it's called) on the exhaust manifold crumbled into rusty cornflakes when the engine was taken apart for the new head gasket earlier this year, but the carb seemed no better or worse for losing it.
Before it was refurbed I was getting a lot of sooty blackness out the exhaust but after it was refurbished it seems to stick open and make things run momentarily lean.
Fundamentally, the engine needs this rebuild to find and fix all the problems, but the finger has been pointed at the carb as a weak point so I'd like to change it. I'd like to change the air box too and I'll be fitting an oil catch because oil is jumping back up into the box. Plus, the big plastic air box is ugly in a bad way and I'd prefer something smarter and metal.
I have not PM'd Guz, I'll do that when I know what I'm going to ask him exactly. Thanks for the tip off.
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Last Edit: Nov 7, 2011 15:00:30 GMT by Deleted
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dungbug
Posted a lot
'Ooligan!
Posts: 2,852
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Ah right I see, the warm air feed did have a bearing on my old Polo. when it was connected it did behave alot better, iirc my first car (1043 Polo, reg AVL 806X) had a metal airbox fitted. I saw a Polo years later at a show & the top part had been replaced with a chrome hubcap from a bug which looked pretty cool. ;D
When you do the rebuild I'd say it would be wise to replace all the vacuum hoses as well as they do decay over time and can make alot of difference (if you hadn't already planned to do so). ;D
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Last Edit: Nov 7, 2011 15:46:09 GMT by dungbug
Past: 13 VW Beetles from 1967 - 1974
Bay Window Campers (1973 & 1974)
Mini's (1992 Cooper lookalike & 1984 '25 Anniversary)
MK2 Polo Coupe S (1984 & 1986)
MK2 Polo Breadvan (1981 & 1984)
MK4 Escort (1989)
MK2 Granada Based Hearse (seriously)
Fiat Uno 60S (1986) Punto 60S (1998) Cinq (1997)
1998 Yamaha YZF600R Thundercat
2003 Ford KA
Current: 2004 Ford Focus (barely alive)
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this gives an idea of the setup of the weber 32 tla on the later 1043cc mk2 polo's. the manifold, there is a metal rubber spacer between it and the carb too  and a look of the carb from the front  the right hand side, showing the autochoke assembly. it can be removed by the 3 screws and a manual choke can be used. Ive seen manual choke conversions in the past on ebay, and I think the weber 32 TL's used on novas are manual versions of this carb  and the left hand side showing where the throttle cable goes (not yet fitted)  and as for air boxes, during winter I'm going to be using the original one as the engine doesnt like cold air. but in summer I'll be using a 9" round one with the top beaten from a 9" diameter cake tin base. handy as the standard filter is 9" diameter and I've had a couple of new k&n filters off ebay for less than £10 (k&n ref E-2585)but think I they were lucky buys  |
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hilux
Part of things
Posts: 12
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The Pierberg/Solex carbs are a right PITA
I had a Weber downdraught and manual choke conversion on my Mk1 with a 1.8 8v driver engine and it flew without issues
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That's nice and clear, thank you Looks relatively straightforward too, if I take my time. Yes, the vacuum hoses are being replaced, pretty much all the hoses are in fact. While on the subject of carbs, aesthetically I love this.  But can/should you fit SU carbs and appropriate filters to this engine, or will it just give me problems? |
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you could fit twin su's, but you'd have to get a manifold made up, which would be the akward part (unless you can weld). a few years ago I did look at fitting a pair of 1.25" su's from a triumph spitfire to my polo as I had some in my attic and the engines have similar power/torque. its also a case of when fitting something thats non standard, getting it to run right.
if you're looking at fitting multiple carbs, bike carbs from a bike of arround 400cc may be cheaper to get and the manifold would be easier to make.
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Have you PM'd Guz for some pointers? He seems to know his onions with watercooled VW's.