"duurtlang" (duurtlang)
09/22/2016 at 11:42 • Filed to: None
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"duurtlang" (duurtlang)
09/22/2016 at 11:42 • Filed to: None | 1
| 21 |
I’m about to look at a car with a carb. A, for a carbed car, modern one from 1986 with a then newish engine design (Peugeot XU5). Single 1 barrel carb. Is this something I can work on with relative ease? I’ve never touched a carburetor in my life.
I currently already own a car with that exact engine, but with FI.
Smallbear wants a modern Syclone, local Maple Leafs spammer
> duurtlang
09/22/2016 at 11:45 |
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Dunno, but is that cylinder at the back the air filter?
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duurtlang
> Smallbear wants a modern Syclone, local Maple Leafs spammer
09/22/2016 at 11:46 |
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Yes it is.
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Smallbear wants a modern Syclone, local Maple Leafs spammer
> duurtlang
09/22/2016 at 11:48 |
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Why is it so long? Does it do some kind of reverse flow thing at the end?
Dr. Zoidberg - RIP Oppo
> duurtlang
09/22/2016 at 11:49 |
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Here’s my 2 cents, from someone who is not mechanically inclined:
YMMV. I’ve owned four carb’d cars, and have DD’d them for the last seven years. Vaccum leaks are unpleasant, mine currently floods like a bastard when warm, stuff like that. Conversely, what is nice is that if you’re having a fuel problem, like it refuses to idle or fire when really old, get out a flat head and just crank up the mixture screw or the idle screw to get you where you need to go (whilst wasting tons of fuel) and then adjust it appropriately later.
Berang
> duurtlang
09/22/2016 at 11:49 |
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Carburetors are great compared to the absolute nightmare that is working on vintage FI.
But really, they shouldn’t ever need attention, there’s very little to go wrong. It’s one of those things that the less you touch it the less likely you are to completely fuck everything up to the point it never works right again.
jimz
> duurtlang
09/22/2016 at 11:49 |
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depends on the specific carb. there usually isn’t much to older ones, apart from making sure the jets/orifices are clean, the needle seats firmly, and the float levels are correct. getting an automatic choke working correctly is usually the hard part.
the electronic feedback carbs which came around in the ‘80s, however, were enormous piles of shit. The feedback QuadraJets and Thermoquads earned the names “Quadrashit” and “Thermobog” for a reason. and the Mikuni disaster used on the Mitsubishi Astron engine family was legendary for going out of whack.
My bird IS the word
> duurtlang
09/22/2016 at 11:57 |
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I did my carburetor blind the first time just this year. I had a really good book on my specific kind of carburetor, but if you can't find something for your carb it can be done but you need to go very, very slow. Take five times more pictures than you think. Most of the complexity comes from the linkages on the outside, and the passages on the inside. Since you can't remove the passages, I would just recommend taking note of how all the little cams and such interact before you start. And buy as extensive of a kit as you can find. It can be done with a lot of confidence and little instruction though.
Rusty Vandura - www.tinyurl.com/keepoppo
> duurtlang
09/22/2016 at 12:01 |
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If you’ve never touched a carburetor in your life, no need to start now.
JawzX2, Boost Addict. 1.6t, 2.7tt, 4.2t
> duurtlang
09/22/2016 at 12:04 |
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carb service flow chart(In words):
does the vehicle start and run acceptably?
YES: DONT TOUCH ANYTHING.
NO: is there a vacuum leak?
yes: Fix leak, everything should be fine again.
no: Are you sure?
yes: Clean it, document every setting, put it back together, with luck everything should be fine, if not, get the service manual and have patience...
no: Fix leak, everything should be fine again.
Twingo Tamer - About to descend into project car hell.
> duurtlang
09/22/2016 at 12:06 |
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Rebuilds arent too hard, adjusting them afterwards is the bad part. (Replying to this comment because the main reply button is kinjad.)
HammerheadFistpunch
> duurtlang
09/22/2016 at 12:09 |
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Looks like its a solex carb. Sorry.
bob and john
> duurtlang
09/22/2016 at 12:16 |
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carbs are ehhh. best part of about them is that if you need to fix something, it’s RIGHT there. maybe you need some hard parts, but for the most part, its all there. you aren’t at the mercy of electronics.
DipodomysDeserti
> Berang
09/22/2016 at 12:29 |
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But really, they shouldn’t ever need attention, there’s very little to go wrong. It’s one of those things that the less you touch it the less likely you are to completely fuck everything up to the point it never works right again.
The whole reason people prefer FI cars is because carbs require so much attention and need to be fiddled with. If you live in a place where the weather stays the same all the time, then you can set it and forget it, but otherwise carbs require tuning in order to run properly. And there are lots of things that can go wrong on carburetors.
CaptDale - is secretly British
> duurtlang
09/22/2016 at 12:32 |
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watch
crowmolly
> duurtlang
09/22/2016 at 12:47 |
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Run ethanol free fuel, ethanol safe parts, and/or ethanol shield.
Today’s gas WILL ruin your shit over time. I have two carbs to go through because of it.
Klaus Schmoll
> duurtlang
09/22/2016 at 12:50 |
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My dad had a burgundy 405 wagon with the 1,8 and carbs in the nineties. He loved it and it really was a nice comfy car. It just buckled like a bronco at wide open throttle, for example on steep inclines or when overtaking (so exactly when you absolutely don’t want that to happen). No garage ever managed to tune the carb properly. Even in the 90s, mechanics didn’t want to have anything to do with carburetors.
My Simson scooter obviously also had a carb. One cylinder, single stage carb, just two screws to adjust it, what could go wrong? Well I got it to cold start well, hot start well, run like a champ at high speed, have a hint of mid-range torque, but never at the same time.
There is a reason that FI was invented.
RallyWrench
> duurtlang
09/22/2016 at 13:10 |
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I’m sure you can. Carburetors (well, most of them) are nothing to be afraid of, especially a 1 barrel. The most frustrating part of the last carbureted cars is the vacuum feedback system used to meet emissions standards. If the carb itself has any blocked ports or jets, or a worn throttle shaft, that can create problems, but as long as you don’t make massive adjustments in one go it’s pretty hard to screw up. If you do get to tinkering with adjustments, only do so incrementally and watch its behavior as you do so.
Jonee
> DipodomysDeserti
09/22/2016 at 13:47 |
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Eh, clean it every once in a while, and turn a few screws. What’s so hard? I’ve been daily driving old carbed cars for 25 trouble-free years.
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Jonee
> duurtlang
09/22/2016 at 13:50 |
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Carburetors are nothing to be afraid of if you’ve worked on cars before. They look more complicated than they are. Sometimes you have to spray some cleaner in there. And sometimes you need to get a screwdriver out and adjust it.
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DipodomysDeserti
> Jonee
09/22/2016 at 14:02 |
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It’s not hard if you’ve been driving carbed cars for 25 years, but there’s definitely a learning curve (especially on an older used car) if you’ve never touched one. To say carbs “never need attention”, as Berang did, is just not true.
I learned how to tune carbs on a ‘63 Corvair. The auto choke wasn’t working right on one of the cylinder banks so i was able to get that car really cheap. I ended up just removing the chokes. I currently have a ‘66 GMC with a four barrel Edelbrock carb which hasn’t needed much tuning. I also have a ‘73 Cl450 with a shorty exhaust. Those carbs needed a lot of work to get the bike idling and pulling. I’m in the desert, where it can be well over 100F during the day then drop into the 50-60s at night. The Edelbrock handles it well, but the Keihin carbs on my motorcycle can be a bit finicky.
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Berang
> DipodomysDeserti
09/22/2016 at 18:15 |
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No really, they don’t need attention. Unless the car has been sitting for a long time and the gaskets have dried out, or the float has absorbed gas, whatever, once the carb is set up one shouldn’t ever have to touch it.
I have had to rebuild carbs and tune carbs, but in each case it was on cars that had been out of use, or on which the previous owner thought they needed to touch the carb and fucked things up.
I drove a 1982 Toyota for four years, which I bought from the original owner, and had to mess with the carb exactly zero times while I owned it. 1978 Le Car, same story. ‘73 Saab? Just had to set the idle mixture. And so on. If a carburetor needs constant fiddling it is either a piece of junk, or somebody has messed with it, or somebody has tried to make the wrong carb work with the engine. People who have it in their head that they should touch the things, because that’s what people do, are the ones that usually create trouble for themselves.