| [ Total Views: 483 | Total Replies: 9 | Thread Id: 22511 ] |
|
|
 vw139
Casual Dubber
Posts: 23
Threads: 5
Registered: March 24th, 2004
Member Is Offline
Location: Syders
Theme: UltimaBB Pro Blue ( Default )
Mood: sweet
|
 posted on May 5th, 2004 at 03:53 PM |
|
|
running rich?
help?
I have a 1500 beetle with a 009 dizzy and 31 Pict carby > timing is sweet 5deg before TDC, but I get the feeling she is running rich on the fuel
(98 octane unleaded with additive)... she spits n gurgles every now and then.
Can anyone describe the formula for adjusting the large and small screws on the side of the carby when the engine is warm (air intake and fuel mix?)
will this help?
cheers 
|
|
|
tassupervee
A.k.a.: Knob Jockey
Custom Title Time!
That really hurts doesnt it!
Posts: 1171
Threads: 25
Registered: September 21st, 2003
Member Is Offline
Location: Huon Valley SouthernTasmania
Theme: UltimaBB Psyche Blue
Mood: Moody!
|
| posted on May 5th, 2004 at 08:16 PM |
|
|
Spits and gurgles?? when?
power on, power off, trailing throttle part power, high revs, low revs....the list is endless and diagnosing a drama with jetting is difficult without
much more info regarding exactly what are the conditions the engine is under when it plays up.
The adjustments you are dealing with are really only slow run and have limited effect overall.
Symptoms of running rich are a relatively regular but "hunting" sound from the exhaust, sort of brmm,,brmm,,brmm,, brmm rather than an even
consistent sound and it should puff "fuelly" smelling black smoke, sooty black spark plugs and shithouse fuel economy.
Leaness down low will result in a harsh uneven idle with an acrid smelling zorst with no smoke and often popping and banging in the zorst pipes on
throttle overrun, say going down a long hill with no throttle.
More info needed.
L8tr
E
Im not a complete idiot, quite a few parts are missing....
|
|
|
vw139
Casual Dubber
Posts: 23
Threads: 5
Registered: March 24th, 2004
Member Is Offline
Location: Syders
Theme: UltimaBB Pro Blue ( Default )
Mood: sweet
|
| posted on May 6th, 2004 at 09:15 AM |
|
|
Ok, ill give it a go
replaced my dizzy a few weeks ago and changed exhaust, she suddenly had power again and sounded just right (an even, sharp beetle exhaust sound, no
pops, no backfires etc) after a few weeks and changing all fuel lines and cleaning out gas tank > she is running a little rougher; the tick over
and increasing revs sound very gurgly with a few flat spots when changing up, black sooty deposit when hands placed over tailpipes, fuel economy is
worse too. Im wondering whether the timing has slipped out slightly or mixture in the carby needs adjusting.
any help?
|
|
|
tassupervee
A.k.a.: Knob Jockey
Custom Title Time!
That really hurts doesnt it!
Posts: 1171
Threads: 25
Registered: September 21st, 2003
Member Is Offline
Location: Huon Valley SouthernTasmania
Theme: UltimaBB Psyche Blue
Mood: Moody!
|
| posted on May 6th, 2004 at 07:03 PM |
|
|
Umm Ur issue sounds like overfuelling (rich) but it would take a fair amount of timing move to make things that bad.
Have you re-checked the timing.....nah must have as your first post says thew timing is sweet.
After dismantling the fuel system, did you fit a new filter between the pump and the carby? is there a filter in there at all?
Presuming there is no filter I would stick my neack out and say you have not cleaned out the tank/line thoroughly enough and some crap has made its
way into the carby and possibly lodging in the float needle resulting in the fuel level going too high.
This issue usually presents itself in best cases as shitty running down low and idle with bad economy but may run ok flat out and at worst, the engine
simply completely flooding with fuel and just dying and plenty of variation in between.
Thats all I can think of dude.
L8tr
E
Im not a complete idiot, quite a few parts are missing....
|
|
|
vw139
Casual Dubber
Posts: 23
Threads: 5
Registered: March 24th, 2004
Member Is Offline
Location: Syders
Theme: UltimaBB Pro Blue ( Default )
Mood: sweet
|
| posted on May 7th, 2004 at 10:38 AM |
|
|
yeah I reckon its overfueling somewhere,
this may be a longshot but I had to fit slightly larger diam fuel pipe from the tank to the first filter (before metal fuel pipe) and then again from
second filter into engine bay (after metal fuel pipe), would this mean that the fuel pump is sucking slightly more fuel into the carby?... the change
in diam pipe was only a 1-2mm. Is this something I can rectify by adjusting the mixture screws or do I have to try and re-fit all new fuel lines
again?
thanks for your help with this
)
|
|
|
tassupervee
A.k.a.: Knob Jockey
Custom Title Time!
That really hurts doesnt it!
Posts: 1171
Threads: 25
Registered: September 21st, 2003
Member Is Offline
Location: Huon Valley SouthernTasmania
Theme: UltimaBB Psyche Blue
Mood: Moody!
|
| posted on May 7th, 2004 at 05:15 PM |
|
|
Hey dude
Nah the size of the inlet pipe to the pump, the filters, the carby or whatever makes no difference to what fuel pressure the carburettor sees, only
the potential flow rate.
This is a good thing. Fuel pressure is determined by the spring pressure in the fuel pump.
I stll feel you may have some crap lodged in the needle and seat.
This is the only explaination I can come up with to explain sudden crappy and rich running after a fuel system refit.
I wouldnt mind betting there is a small sliver of rubber from the lines or some other shit like that that has managed to make its way into the needle
and seat and just holding it open enough to allow too much fuel past when the car is not running hard resulting in the fuel level in the carb climbing
up and rich running.
You may ned to remove the top off the carby and carefully remove the float and needle to clean out the seat.
That would be my thinking neway dude.
Lemme know how you go.
L8tr dude
Im not a complete idiot, quite a few parts are missing....
|
|
|
vw139
Casual Dubber
Posts: 23
Threads: 5
Registered: March 24th, 2004
Member Is Offline
Location: Syders
Theme: UltimaBB Pro Blue ( Default )
Mood: sweet
|
| posted on May 10th, 2004 at 03:14 PM |
|
|
phew > dont have to change the fuel lines again!!
cheers man > is it a tough job removing the float and needle from the carby > have never done carby overhauls before...
|
|
|
tassupervee
A.k.a.: Knob Jockey
Custom Title Time!
That really hurts doesnt it!
Posts: 1171
Threads: 25
Registered: September 21st, 2003
Member Is Offline
Location: Huon Valley SouthernTasmania
Theme: UltimaBB Psyche Blue
Mood: Moody!
|
| posted on May 10th, 2004 at 07:40 PM |
|
|
Nup!
Simple as!
Make sure you have a new float bowl gasket on hand b4 you remove it as you can bet your bippy the old one will tear and that will guarantee you to
tear out your own hair!
Remove your air filter and have a bit of a look at the top of the carby.
there are a couple of set screws there on top and those are the little blighters you need to remove.
There are a few other little arms and stuff offen the choke that will have to come off but it is all very straightforward.
When you have it sussed just unbolt the carb off the manifold and clamp it GENTLY in a vise and do your stuff.
When you get the cover off, the float and needle live underneath the cover. You gotta remove the pin that the float swings off, usually the will just
fall out.
The float should fall off then and you can carefully extract the needle itself.
Have a close look at the neeedle itself to see iffen thee is any damage or weird looking wear at the pointy bit.
Have a close look up the guts of the seat and make sure there is no damage in there or any bits of crap in the small hole.
After that just blow out the fuel inlet and have a close look in there to make sure ther is no crap hiding up where the needle lives.
Dont use wire to poke around in there as this may/will scratch the brass seat and may cause permanent dramas.
Lastly, shake the float close to your ear and listen carefully for any fluid in the float.
This leads to a sinking float and incorrect fuel level and eventual flooding of the engine.
Its all pretty easy when you have a good look at it before attacking it K.
L8tr M8
E
Im not a complete idiot, quite a few parts are missing....
|
|
|
vw139
Casual Dubber
Posts: 23
Threads: 5
Registered: March 24th, 2004
Member Is Offline
Location: Syders
Theme: UltimaBB Pro Blue ( Default )
Mood: sweet
|
| posted on May 11th, 2004 at 09:42 AM |
|
|
I know what I will be doing this weekend!! thanks heaps for your help dude.
D
|
|
|
tassupervee
A.k.a.: Knob Jockey
Custom Title Time!
That really hurts doesnt it!
Posts: 1171
Threads: 25
Registered: September 21st, 2003
Member Is Offline
Location: Huon Valley SouthernTasmania
Theme: UltimaBB Psyche Blue
Mood: Moody!
|
| posted on May 11th, 2004 at 03:36 PM |
|
|
Pleasure M8
I hope it turns out to actually be that otherwise i may not be such a M8.
LOL
L8tr dude
E
Im not a complete idiot, quite a few parts are missing....
|
|
|
Craig Torrens
A.k.a.: Craig Torrens
Scirocco Rare
6 times Australian, 7 times State Hillclimb Class Champion
Posts: 8040
Threads: 347
Registered: January 10th, 2003
Member Is Offline
Location: Sydney
Theme: UltimaBB Pro Blue ( Default )
Mood: Time to go Salt lake racing, and actually achieve a result.
|
| posted on May 11th, 2004 at 05:37 PM |
|
|
Have you checked that your choke isn't staying on? you may have pulled the wire off when you were replacing the fuel lines ??? fits your symptoms.
Also check the condition of your air filter?
just a thought
[Edited on 11-5-2004 by Craig Torrens]
|
|
|
vw139
Casual Dubber
Posts: 23
Threads: 5
Registered: March 24th, 2004
Member Is Offline
Location: Syders
Theme: UltimaBB Pro Blue ( Default )
Mood: sweet
|
| posted on May 12th, 2004 at 10:24 AM |
|
|
if I am checking the condition of my air filter > what should I look for? I checked the oil bath level and cleaned out the crud from the bottom
just before Christmas, is there something else to check?
cheers
d
|
|
|
